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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57383 91177308-0d34-0410-b5e6-96231b3b80d8
1575 lines
56 KiB
C++
1575 lines
56 KiB
C++
//===-- llvm/ADT/APInt.h - For Arbitrary Precision Integer -----*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a class to represent arbitrary precision integral
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// constant values and operations on them.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_APINT_H
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#define LLVM_APINT_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/MathExtras.h"
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#include <cassert>
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#include <cstring>
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#include <string>
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namespace llvm {
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class Serializer;
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class Deserializer;
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class FoldingSetNodeID;
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class raw_ostream;
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template<typename T>
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class SmallVectorImpl;
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/* An unsigned host type used as a single part of a multi-part
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bignum. */
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typedef uint64_t integerPart;
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const unsigned int host_char_bit = 8;
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const unsigned int integerPartWidth = host_char_bit *
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static_cast<unsigned int>(sizeof(integerPart));
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//===----------------------------------------------------------------------===//
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// APInt Class
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//===----------------------------------------------------------------------===//
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/// APInt - This class represents arbitrary precision constant integral values.
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/// It is a functional replacement for common case unsigned integer type like
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/// "unsigned", "unsigned long" or "uint64_t", but also allows non-byte-width
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/// integer sizes and large integer value types such as 3-bits, 15-bits, or more
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/// than 64-bits of precision. APInt provides a variety of arithmetic operators
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/// and methods to manipulate integer values of any bit-width. It supports both
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/// the typical integer arithmetic and comparison operations as well as bitwise
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/// manipulation.
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///
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/// The class has several invariants worth noting:
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/// * All bit, byte, and word positions are zero-based.
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/// * Once the bit width is set, it doesn't change except by the Truncate,
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/// SignExtend, or ZeroExtend operations.
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/// * All binary operators must be on APInt instances of the same bit width.
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/// Attempting to use these operators on instances with different bit
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/// widths will yield an assertion.
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/// * The value is stored canonically as an unsigned value. For operations
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/// where it makes a difference, there are both signed and unsigned variants
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/// of the operation. For example, sdiv and udiv. However, because the bit
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/// widths must be the same, operations such as Mul and Add produce the same
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/// results regardless of whether the values are interpreted as signed or
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/// not.
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/// * In general, the class tries to follow the style of computation that LLVM
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/// uses in its IR. This simplifies its use for LLVM.
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///
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/// @brief Class for arbitrary precision integers.
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class APInt {
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uint32_t BitWidth; ///< The number of bits in this APInt.
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/// This union is used to store the integer value. When the
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/// integer bit-width <= 64, it uses VAL, otherwise it uses pVal.
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union {
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uint64_t VAL; ///< Used to store the <= 64 bits integer value.
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uint64_t *pVal; ///< Used to store the >64 bits integer value.
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};
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/// This enum is used to hold the constants we needed for APInt.
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enum {
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/// Bits in a word
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APINT_BITS_PER_WORD = static_cast<unsigned int>(sizeof(uint64_t)) * 8,
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/// Byte size of a word
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APINT_WORD_SIZE = static_cast<unsigned int>(sizeof(uint64_t))
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};
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/// This constructor is used only internally for speed of construction of
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/// temporaries. It is unsafe for general use so it is not public.
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/// @brief Fast internal constructor
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APInt(uint64_t* val, uint32_t bits) : BitWidth(bits), pVal(val) { }
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/// @returns true if the number of bits <= 64, false otherwise.
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/// @brief Determine if this APInt just has one word to store value.
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bool isSingleWord() const {
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return BitWidth <= APINT_BITS_PER_WORD;
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}
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/// @returns the word position for the specified bit position.
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/// @brief Determine which word a bit is in.
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static uint32_t whichWord(uint32_t bitPosition) {
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return bitPosition / APINT_BITS_PER_WORD;
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}
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/// @returns the bit position in a word for the specified bit position
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/// in the APInt.
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/// @brief Determine which bit in a word a bit is in.
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static uint32_t whichBit(uint32_t bitPosition) {
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return bitPosition % APINT_BITS_PER_WORD;
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}
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/// This method generates and returns a uint64_t (word) mask for a single
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/// bit at a specific bit position. This is used to mask the bit in the
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/// corresponding word.
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/// @returns a uint64_t with only bit at "whichBit(bitPosition)" set
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/// @brief Get a single bit mask.
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static uint64_t maskBit(uint32_t bitPosition) {
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return 1ULL << whichBit(bitPosition);
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}
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/// This method is used internally to clear the to "N" bits in the high order
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/// word that are not used by the APInt. This is needed after the most
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/// significant word is assigned a value to ensure that those bits are
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/// zero'd out.
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/// @brief Clear unused high order bits
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APInt& clearUnusedBits() {
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// Compute how many bits are used in the final word
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uint32_t wordBits = BitWidth % APINT_BITS_PER_WORD;
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if (wordBits == 0)
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// If all bits are used, we want to leave the value alone. This also
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// avoids the undefined behavior of >> when the shift is the same size as
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// the word size (64).
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return *this;
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// Mask out the high bits.
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uint64_t mask = ~uint64_t(0ULL) >> (APINT_BITS_PER_WORD - wordBits);
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if (isSingleWord())
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VAL &= mask;
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else
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pVal[getNumWords() - 1] &= mask;
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return *this;
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}
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/// @returns the corresponding word for the specified bit position.
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/// @brief Get the word corresponding to a bit position
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uint64_t getWord(uint32_t bitPosition) const {
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return isSingleWord() ? VAL : pVal[whichWord(bitPosition)];
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}
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/// This is used by the constructors that take string arguments.
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/// @brief Convert a char array into an APInt
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void fromString(uint32_t numBits, const char *strStart, uint32_t slen,
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uint8_t radix);
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/// This is used by the toString method to divide by the radix. It simply
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/// provides a more convenient form of divide for internal use since KnuthDiv
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/// has specific constraints on its inputs. If those constraints are not met
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/// then it provides a simpler form of divide.
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/// @brief An internal division function for dividing APInts.
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static void divide(const APInt LHS, uint32_t lhsWords,
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const APInt &RHS, uint32_t rhsWords,
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APInt *Quotient, APInt *Remainder);
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/// out-of-line slow case for inline constructor
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void initSlowCase(uint32_t numBits, uint64_t val, bool isSigned);
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/// out-of-line slow case for inline copy constructor
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void initSlowCase(const APInt& that);
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/// out-of-line slow case for shl
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APInt shlSlowCase(uint32_t shiftAmt) const;
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/// out-of-line slow case for operator&
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APInt AndSlowCase(const APInt& RHS) const;
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/// out-of-line slow case for operator|
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APInt OrSlowCase(const APInt& RHS) const;
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/// out-of-line slow case for operator^
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APInt XorSlowCase(const APInt& RHS) const;
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/// out-of-line slow case for operator=
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APInt& AssignSlowCase(const APInt& RHS);
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/// out-of-line slow case for operator==
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bool EqualSlowCase(const APInt& RHS) const;
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/// out-of-line slow case for operator==
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bool EqualSlowCase(uint64_t Val) const;
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/// out-of-line slow case for countLeadingZeros
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uint32_t countLeadingZerosSlowCase() const;
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/// out-of-line slow case for countTrailingOnes
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uint32_t countTrailingOnesSlowCase() const;
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/// out-of-line slow case for countPopulation
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uint32_t countPopulationSlowCase() const;
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public:
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/// @name Constructors
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/// @{
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/// If isSigned is true then val is treated as if it were a signed value
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/// (i.e. as an int64_t) and the appropriate sign extension to the bit width
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/// will be done. Otherwise, no sign extension occurs (high order bits beyond
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/// the range of val are zero filled).
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/// @param numBits the bit width of the constructed APInt
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/// @param val the initial value of the APInt
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/// @param isSigned how to treat signedness of val
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/// @brief Create a new APInt of numBits width, initialized as val.
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APInt(uint32_t numBits, uint64_t val, bool isSigned = false)
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: BitWidth(numBits), VAL(0) {
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assert(BitWidth && "bitwidth too small");
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if (isSingleWord())
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VAL = val;
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else
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initSlowCase(numBits, val, isSigned);
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clearUnusedBits();
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}
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/// Note that numWords can be smaller or larger than the corresponding bit
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/// width but any extraneous bits will be dropped.
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/// @param numBits the bit width of the constructed APInt
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/// @param numWords the number of words in bigVal
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/// @param bigVal a sequence of words to form the initial value of the APInt
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/// @brief Construct an APInt of numBits width, initialized as bigVal[].
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APInt(uint32_t numBits, uint32_t numWords, const uint64_t bigVal[]);
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/// This constructor interprets the slen characters starting at StrStart as
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/// a string in the given radix. The interpretation stops when the first
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/// character that is not suitable for the radix is encountered. Acceptable
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/// radix values are 2, 8, 10 and 16. It is an error for the value implied by
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/// the string to require more bits than numBits.
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/// @param numBits the bit width of the constructed APInt
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/// @param strStart the start of the string to be interpreted
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/// @param slen the maximum number of characters to interpret
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/// @param radix the radix to use for the conversion
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/// @brief Construct an APInt from a string representation.
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APInt(uint32_t numBits, const char strStart[], uint32_t slen, uint8_t radix);
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/// Simply makes *this a copy of that.
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/// @brief Copy Constructor.
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APInt(const APInt& that)
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: BitWidth(that.BitWidth), VAL(0) {
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assert(BitWidth && "bitwidth too small");
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if (isSingleWord())
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VAL = that.VAL;
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else
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initSlowCase(that);
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}
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/// @brief Destructor.
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~APInt() {
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if (!isSingleWord())
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delete [] pVal;
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}
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/// Default constructor that creates an uninitialized APInt. This is useful
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/// for object deserialization (pair this with the static method Read).
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explicit APInt() : BitWidth(1) {}
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/// Profile - Used to insert APInt objects, or objects that contain APInt
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/// objects, into FoldingSets.
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void Profile(FoldingSetNodeID& id) const;
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/// @brief Used by the Bitcode serializer to emit APInts to Bitcode.
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void Emit(Serializer& S) const;
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/// @brief Used by the Bitcode deserializer to deserialize APInts.
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void Read(Deserializer& D);
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/// @}
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/// @name Value Tests
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/// @{
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/// This tests the high bit of this APInt to determine if it is set.
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/// @returns true if this APInt is negative, false otherwise
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/// @brief Determine sign of this APInt.
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bool isNegative() const {
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return (*this)[BitWidth - 1];
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}
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/// This tests the high bit of the APInt to determine if it is unset.
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/// @brief Determine if this APInt Value is non-negative (>= 0)
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bool isNonNegative() const {
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return !isNegative();
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}
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/// This tests if the value of this APInt is positive (> 0). Note
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/// that 0 is not a positive value.
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/// @returns true if this APInt is positive.
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/// @brief Determine if this APInt Value is positive.
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bool isStrictlyPositive() const {
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return isNonNegative() && (*this) != 0;
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}
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/// This checks to see if the value has all bits of the APInt are set or not.
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/// @brief Determine if all bits are set
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bool isAllOnesValue() const {
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return countPopulation() == BitWidth;
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}
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/// This checks to see if the value of this APInt is the maximum unsigned
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/// value for the APInt's bit width.
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/// @brief Determine if this is the largest unsigned value.
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bool isMaxValue() const {
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return countPopulation() == BitWidth;
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}
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/// This checks to see if the value of this APInt is the maximum signed
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/// value for the APInt's bit width.
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/// @brief Determine if this is the largest signed value.
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bool isMaxSignedValue() const {
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return BitWidth == 1 ? VAL == 0 :
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!isNegative() && countPopulation() == BitWidth - 1;
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}
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/// This checks to see if the value of this APInt is the minimum unsigned
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/// value for the APInt's bit width.
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/// @brief Determine if this is the smallest unsigned value.
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bool isMinValue() const {
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return countPopulation() == 0;
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}
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/// This checks to see if the value of this APInt is the minimum signed
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/// value for the APInt's bit width.
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/// @brief Determine if this is the smallest signed value.
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bool isMinSignedValue() const {
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return BitWidth == 1 ? VAL == 1 :
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isNegative() && countPopulation() == 1;
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}
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/// @brief Check if this APInt has an N-bits unsigned integer value.
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bool isIntN(uint32_t N) const {
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assert(N && "N == 0 ???");
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if (isSingleWord()) {
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return VAL == (VAL & (~0ULL >> (64 - N)));
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} else {
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APInt Tmp(N, getNumWords(), pVal);
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return Tmp == (*this);
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}
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}
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/// @brief Check if this APInt has an N-bits signed integer value.
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bool isSignedIntN(uint32_t N) const {
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assert(N && "N == 0 ???");
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return getMinSignedBits() <= N;
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}
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/// @returns true if the argument APInt value is a power of two > 0.
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bool isPowerOf2() const;
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/// isSignBit - Return true if this is the value returned by getSignBit.
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bool isSignBit() const { return isMinSignedValue(); }
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/// This converts the APInt to a boolean value as a test against zero.
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/// @brief Boolean conversion function.
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bool getBoolValue() const {
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return *this != 0;
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}
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/// getLimitedValue - If this value is smaller than the specified limit,
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/// return it, otherwise return the limit value. This causes the value
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/// to saturate to the limit.
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uint64_t getLimitedValue(uint64_t Limit = ~0ULL) const {
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return (getActiveBits() > 64 || getZExtValue() > Limit) ?
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Limit : getZExtValue();
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}
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/// @}
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/// @name Value Generators
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/// @{
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/// @brief Gets maximum unsigned value of APInt for specific bit width.
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static APInt getMaxValue(uint32_t numBits) {
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return APInt(numBits, 0).set();
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}
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/// @brief Gets maximum signed value of APInt for a specific bit width.
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static APInt getSignedMaxValue(uint32_t numBits) {
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return APInt(numBits, 0).set().clear(numBits - 1);
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}
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/// @brief Gets minimum unsigned value of APInt for a specific bit width.
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static APInt getMinValue(uint32_t numBits) {
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return APInt(numBits, 0);
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}
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/// @brief Gets minimum signed value of APInt for a specific bit width.
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static APInt getSignedMinValue(uint32_t numBits) {
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return APInt(numBits, 0).set(numBits - 1);
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}
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/// getSignBit - This is just a wrapper function of getSignedMinValue(), and
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/// it helps code readability when we want to get a SignBit.
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/// @brief Get the SignBit for a specific bit width.
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static APInt getSignBit(uint32_t BitWidth) {
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return getSignedMinValue(BitWidth);
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}
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/// @returns the all-ones value for an APInt of the specified bit-width.
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/// @brief Get the all-ones value.
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static APInt getAllOnesValue(uint32_t numBits) {
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return APInt(numBits, 0).set();
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}
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/// @returns the '0' value for an APInt of the specified bit-width.
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/// @brief Get the '0' value.
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static APInt getNullValue(uint32_t numBits) {
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return APInt(numBits, 0);
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}
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/// Get an APInt with the same BitWidth as this APInt, just zero mask
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/// the low bits and right shift to the least significant bit.
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/// @returns the high "numBits" bits of this APInt.
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APInt getHiBits(uint32_t numBits) const;
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/// Get an APInt with the same BitWidth as this APInt, just zero mask
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/// the high bits.
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/// @returns the low "numBits" bits of this APInt.
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APInt getLoBits(uint32_t numBits) const;
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/// Constructs an APInt value that has a contiguous range of bits set. The
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/// bits from loBit (inclusive) to hiBit (exclusive) will be set. All other
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/// bits will be zero. For example, with parameters(32, 0, 16) you would get
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/// 0x0000FFFF. If hiBit is less than loBit then the set bits "wrap". For
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/// example, with parameters (32, 28, 4), you would get 0xF000000F.
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/// @param numBits the intended bit width of the result
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/// @param loBit the index of the lowest bit set.
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/// @param hiBit the index of the highest bit set.
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/// @returns An APInt value with the requested bits set.
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/// @brief Get a value with a block of bits set.
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static APInt getBitsSet(uint32_t numBits, uint32_t loBit, uint32_t hiBit) {
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assert(hiBit <= numBits && "hiBit out of range");
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assert(loBit < numBits && "loBit out of range");
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if (hiBit < loBit)
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return getLowBitsSet(numBits, hiBit) |
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getHighBitsSet(numBits, numBits-loBit);
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return getLowBitsSet(numBits, hiBit-loBit).shl(loBit);
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}
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/// Constructs an APInt value that has the top hiBitsSet bits set.
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/// @param numBits the bitwidth of the result
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/// @param hiBitsSet the number of high-order bits set in the result.
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/// @brief Get a value with high bits set
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static APInt getHighBitsSet(uint32_t numBits, uint32_t hiBitsSet) {
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assert(hiBitsSet <= numBits && "Too many bits to set!");
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// Handle a degenerate case, to avoid shifting by word size
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if (hiBitsSet == 0)
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return APInt(numBits, 0);
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uint32_t shiftAmt = numBits - hiBitsSet;
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// For small values, return quickly
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if (numBits <= APINT_BITS_PER_WORD)
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return APInt(numBits, ~0ULL << shiftAmt);
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return (~APInt(numBits, 0)).shl(shiftAmt);
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}
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/// Constructs an APInt value that has the bottom loBitsSet bits set.
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/// @param numBits the bitwidth of the result
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/// @param loBitsSet the number of low-order bits set in the result.
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/// @brief Get a value with low bits set
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static APInt getLowBitsSet(uint32_t numBits, uint32_t loBitsSet) {
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assert(loBitsSet <= numBits && "Too many bits to set!");
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// Handle a degenerate case, to avoid shifting by word size
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if (loBitsSet == 0)
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return APInt(numBits, 0);
|
|
if (loBitsSet == APINT_BITS_PER_WORD)
|
|
return APInt(numBits, -1ULL);
|
|
// For small values, return quickly.
|
|
if (numBits < APINT_BITS_PER_WORD)
|
|
return APInt(numBits, (1ULL << loBitsSet) - 1);
|
|
return (~APInt(numBits, 0)).lshr(numBits - loBitsSet);
|
|
}
|
|
|
|
/// The hash value is computed as the sum of the words and the bit width.
|
|
/// @returns A hash value computed from the sum of the APInt words.
|
|
/// @brief Get a hash value based on this APInt
|
|
uint64_t getHashValue() const;
|
|
|
|
/// This function returns a pointer to the internal storage of the APInt.
|
|
/// This is useful for writing out the APInt in binary form without any
|
|
/// conversions.
|
|
const uint64_t* getRawData() const {
|
|
if (isSingleWord())
|
|
return &VAL;
|
|
return &pVal[0];
|
|
}
|
|
|
|
/// @}
|
|
/// @name Unary Operators
|
|
/// @{
|
|
/// @returns a new APInt value representing *this incremented by one
|
|
/// @brief Postfix increment operator.
|
|
const APInt operator++(int) {
|
|
APInt API(*this);
|
|
++(*this);
|
|
return API;
|
|
}
|
|
|
|
/// @returns *this incremented by one
|
|
/// @brief Prefix increment operator.
|
|
APInt& operator++();
|
|
|
|
/// @returns a new APInt representing *this decremented by one.
|
|
/// @brief Postfix decrement operator.
|
|
const APInt operator--(int) {
|
|
APInt API(*this);
|
|
--(*this);
|
|
return API;
|
|
}
|
|
|
|
/// @returns *this decremented by one.
|
|
/// @brief Prefix decrement operator.
|
|
APInt& operator--();
|
|
|
|
/// Performs a bitwise complement operation on this APInt.
|
|
/// @returns an APInt that is the bitwise complement of *this
|
|
/// @brief Unary bitwise complement operator.
|
|
APInt operator~() const {
|
|
APInt Result(*this);
|
|
Result.flip();
|
|
return Result;
|
|
}
|
|
|
|
/// Negates *this using two's complement logic.
|
|
/// @returns An APInt value representing the negation of *this.
|
|
/// @brief Unary negation operator
|
|
APInt operator-() const {
|
|
return APInt(BitWidth, 0) - (*this);
|
|
}
|
|
|
|
/// Performs logical negation operation on this APInt.
|
|
/// @returns true if *this is zero, false otherwise.
|
|
/// @brief Logical negation operator.
|
|
bool operator!() const;
|
|
|
|
/// @}
|
|
/// @name Assignment Operators
|
|
/// @{
|
|
/// @returns *this after assignment of RHS.
|
|
/// @brief Copy assignment operator.
|
|
APInt& operator=(const APInt& RHS) {
|
|
// If the bitwidths are the same, we can avoid mucking with memory
|
|
if (isSingleWord() && RHS.isSingleWord()) {
|
|
VAL = RHS.VAL;
|
|
BitWidth = RHS.BitWidth;
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
return AssignSlowCase(RHS);
|
|
}
|
|
|
|
/// The RHS value is assigned to *this. If the significant bits in RHS exceed
|
|
/// the bit width, the excess bits are truncated. If the bit width is larger
|
|
/// than 64, the value is zero filled in the unspecified high order bits.
|
|
/// @returns *this after assignment of RHS value.
|
|
/// @brief Assignment operator.
|
|
APInt& operator=(uint64_t RHS);
|
|
|
|
/// Performs a bitwise AND operation on this APInt and RHS. The result is
|
|
/// assigned to *this.
|
|
/// @returns *this after ANDing with RHS.
|
|
/// @brief Bitwise AND assignment operator.
|
|
APInt& operator&=(const APInt& RHS);
|
|
|
|
/// Performs a bitwise OR operation on this APInt and RHS. The result is
|
|
/// assigned *this;
|
|
/// @returns *this after ORing with RHS.
|
|
/// @brief Bitwise OR assignment operator.
|
|
APInt& operator|=(const APInt& RHS);
|
|
|
|
/// Performs a bitwise XOR operation on this APInt and RHS. The result is
|
|
/// assigned to *this.
|
|
/// @returns *this after XORing with RHS.
|
|
/// @brief Bitwise XOR assignment operator.
|
|
APInt& operator^=(const APInt& RHS);
|
|
|
|
/// Multiplies this APInt by RHS and assigns the result to *this.
|
|
/// @returns *this
|
|
/// @brief Multiplication assignment operator.
|
|
APInt& operator*=(const APInt& RHS);
|
|
|
|
/// Adds RHS to *this and assigns the result to *this.
|
|
/// @returns *this
|
|
/// @brief Addition assignment operator.
|
|
APInt& operator+=(const APInt& RHS);
|
|
|
|
/// Subtracts RHS from *this and assigns the result to *this.
|
|
/// @returns *this
|
|
/// @brief Subtraction assignment operator.
|
|
APInt& operator-=(const APInt& RHS);
|
|
|
|
/// Shifts *this left by shiftAmt and assigns the result to *this.
|
|
/// @returns *this after shifting left by shiftAmt
|
|
/// @brief Left-shift assignment function.
|
|
APInt& operator<<=(uint32_t shiftAmt) {
|
|
*this = shl(shiftAmt);
|
|
return *this;
|
|
}
|
|
|
|
/// @}
|
|
/// @name Binary Operators
|
|
/// @{
|
|
/// Performs a bitwise AND operation on *this and RHS.
|
|
/// @returns An APInt value representing the bitwise AND of *this and RHS.
|
|
/// @brief Bitwise AND operator.
|
|
APInt operator&(const APInt& RHS) const {
|
|
assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
|
|
if (isSingleWord())
|
|
return APInt(getBitWidth(), VAL & RHS.VAL);
|
|
return AndSlowCase(RHS);
|
|
}
|
|
APInt And(const APInt& RHS) const {
|
|
return this->operator&(RHS);
|
|
}
|
|
|
|
/// Performs a bitwise OR operation on *this and RHS.
|
|
/// @returns An APInt value representing the bitwise OR of *this and RHS.
|
|
/// @brief Bitwise OR operator.
|
|
APInt operator|(const APInt& RHS) const {
|
|
assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
|
|
if (isSingleWord())
|
|
return APInt(getBitWidth(), VAL | RHS.VAL);
|
|
return OrSlowCase(RHS);
|
|
}
|
|
APInt Or(const APInt& RHS) const {
|
|
return this->operator|(RHS);
|
|
}
|
|
|
|
/// Performs a bitwise XOR operation on *this and RHS.
|
|
/// @returns An APInt value representing the bitwise XOR of *this and RHS.
|
|
/// @brief Bitwise XOR operator.
|
|
APInt operator^(const APInt& RHS) const {
|
|
assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
|
|
if (isSingleWord())
|
|
return APInt(BitWidth, VAL ^ RHS.VAL);
|
|
return XorSlowCase(RHS);
|
|
}
|
|
APInt Xor(const APInt& RHS) const {
|
|
return this->operator^(RHS);
|
|
}
|
|
|
|
/// Multiplies this APInt by RHS and returns the result.
|
|
/// @brief Multiplication operator.
|
|
APInt operator*(const APInt& RHS) const;
|
|
|
|
/// Adds RHS to this APInt and returns the result.
|
|
/// @brief Addition operator.
|
|
APInt operator+(const APInt& RHS) const;
|
|
APInt operator+(uint64_t RHS) const {
|
|
return (*this) + APInt(BitWidth, RHS);
|
|
}
|
|
|
|
/// Subtracts RHS from this APInt and returns the result.
|
|
/// @brief Subtraction operator.
|
|
APInt operator-(const APInt& RHS) const;
|
|
APInt operator-(uint64_t RHS) const {
|
|
return (*this) - APInt(BitWidth, RHS);
|
|
}
|
|
|
|
APInt operator<<(unsigned Bits) const {
|
|
return shl(Bits);
|
|
}
|
|
|
|
APInt operator<<(const APInt &Bits) const {
|
|
return shl(Bits);
|
|
}
|
|
|
|
/// Arithmetic right-shift this APInt by shiftAmt.
|
|
/// @brief Arithmetic right-shift function.
|
|
APInt ashr(uint32_t shiftAmt) const;
|
|
|
|
/// Logical right-shift this APInt by shiftAmt.
|
|
/// @brief Logical right-shift function.
|
|
APInt lshr(uint32_t shiftAmt) const;
|
|
|
|
/// Left-shift this APInt by shiftAmt.
|
|
/// @brief Left-shift function.
|
|
APInt shl(uint32_t shiftAmt) const {
|
|
assert(shiftAmt <= BitWidth && "Invalid shift amount");
|
|
if (isSingleWord()) {
|
|
if (shiftAmt == BitWidth)
|
|
return APInt(BitWidth, 0); // avoid undefined shift results
|
|
return APInt(BitWidth, VAL << shiftAmt);
|
|
}
|
|
return shlSlowCase(shiftAmt);
|
|
}
|
|
|
|
/// @brief Rotate left by rotateAmt.
|
|
APInt rotl(uint32_t rotateAmt) const;
|
|
|
|
/// @brief Rotate right by rotateAmt.
|
|
APInt rotr(uint32_t rotateAmt) const;
|
|
|
|
/// Arithmetic right-shift this APInt by shiftAmt.
|
|
/// @brief Arithmetic right-shift function.
|
|
APInt ashr(const APInt &shiftAmt) const;
|
|
|
|
/// Logical right-shift this APInt by shiftAmt.
|
|
/// @brief Logical right-shift function.
|
|
APInt lshr(const APInt &shiftAmt) const;
|
|
|
|
/// Left-shift this APInt by shiftAmt.
|
|
/// @brief Left-shift function.
|
|
APInt shl(const APInt &shiftAmt) const;
|
|
|
|
/// @brief Rotate left by rotateAmt.
|
|
APInt rotl(const APInt &rotateAmt) const;
|
|
|
|
/// @brief Rotate right by rotateAmt.
|
|
APInt rotr(const APInt &rotateAmt) const;
|
|
|
|
/// Perform an unsigned divide operation on this APInt by RHS. Both this and
|
|
/// RHS are treated as unsigned quantities for purposes of this division.
|
|
/// @returns a new APInt value containing the division result
|
|
/// @brief Unsigned division operation.
|
|
APInt udiv(const APInt& RHS) const;
|
|
|
|
/// Signed divide this APInt by APInt RHS.
|
|
/// @brief Signed division function for APInt.
|
|
APInt sdiv(const APInt& RHS) const {
|
|
if (isNegative())
|
|
if (RHS.isNegative())
|
|
return (-(*this)).udiv(-RHS);
|
|
else
|
|
return -((-(*this)).udiv(RHS));
|
|
else if (RHS.isNegative())
|
|
return -(this->udiv(-RHS));
|
|
return this->udiv(RHS);
|
|
}
|
|
|
|
/// Perform an unsigned remainder operation on this APInt with RHS being the
|
|
/// divisor. Both this and RHS are treated as unsigned quantities for purposes
|
|
/// of this operation. Note that this is a true remainder operation and not
|
|
/// a modulo operation because the sign follows the sign of the dividend
|
|
/// which is *this.
|
|
/// @returns a new APInt value containing the remainder result
|
|
/// @brief Unsigned remainder operation.
|
|
APInt urem(const APInt& RHS) const;
|
|
|
|
/// Signed remainder operation on APInt.
|
|
/// @brief Function for signed remainder operation.
|
|
APInt srem(const APInt& RHS) const {
|
|
if (isNegative())
|
|
if (RHS.isNegative())
|
|
return -((-(*this)).urem(-RHS));
|
|
else
|
|
return -((-(*this)).urem(RHS));
|
|
else if (RHS.isNegative())
|
|
return this->urem(-RHS);
|
|
return this->urem(RHS);
|
|
}
|
|
|
|
/// Sometimes it is convenient to divide two APInt values and obtain both the
|
|
/// quotient and remainder. This function does both operations in the same
|
|
/// computation making it a little more efficient. The pair of input arguments
|
|
/// may overlap with the pair of output arguments. It is safe to call
|
|
/// udivrem(X, Y, X, Y), for example.
|
|
/// @brief Dual division/remainder interface.
|
|
static void udivrem(const APInt &LHS, const APInt &RHS,
|
|
APInt &Quotient, APInt &Remainder);
|
|
|
|
static void sdivrem(const APInt &LHS, const APInt &RHS,
|
|
APInt &Quotient, APInt &Remainder)
|
|
{
|
|
if (LHS.isNegative()) {
|
|
if (RHS.isNegative())
|
|
APInt::udivrem(-LHS, -RHS, Quotient, Remainder);
|
|
else
|
|
APInt::udivrem(-LHS, RHS, Quotient, Remainder);
|
|
Quotient = -Quotient;
|
|
Remainder = -Remainder;
|
|
} else if (RHS.isNegative()) {
|
|
APInt::udivrem(LHS, -RHS, Quotient, Remainder);
|
|
Quotient = -Quotient;
|
|
} else {
|
|
APInt::udivrem(LHS, RHS, Quotient, Remainder);
|
|
}
|
|
}
|
|
|
|
/// @returns the bit value at bitPosition
|
|
/// @brief Array-indexing support.
|
|
bool operator[](uint32_t bitPosition) const;
|
|
|
|
/// @}
|
|
/// @name Comparison Operators
|
|
/// @{
|
|
/// Compares this APInt with RHS for the validity of the equality
|
|
/// relationship.
|
|
/// @brief Equality operator.
|
|
bool operator==(const APInt& RHS) const {
|
|
assert(BitWidth == RHS.BitWidth && "Comparison requires equal bit widths");
|
|
if (isSingleWord())
|
|
return VAL == RHS.VAL;
|
|
return EqualSlowCase(RHS);
|
|
}
|
|
|
|
/// Compares this APInt with a uint64_t for the validity of the equality
|
|
/// relationship.
|
|
/// @returns true if *this == Val
|
|
/// @brief Equality operator.
|
|
bool operator==(uint64_t Val) const {
|
|
if (isSingleWord())
|
|
return VAL == Val;
|
|
return EqualSlowCase(Val);
|
|
}
|
|
|
|
/// Compares this APInt with RHS for the validity of the equality
|
|
/// relationship.
|
|
/// @returns true if *this == Val
|
|
/// @brief Equality comparison.
|
|
bool eq(const APInt &RHS) const {
|
|
return (*this) == RHS;
|
|
}
|
|
|
|
/// Compares this APInt with RHS for the validity of the inequality
|
|
/// relationship.
|
|
/// @returns true if *this != Val
|
|
/// @brief Inequality operator.
|
|
bool operator!=(const APInt& RHS) const {
|
|
return !((*this) == RHS);
|
|
}
|
|
|
|
/// Compares this APInt with a uint64_t for the validity of the inequality
|
|
/// relationship.
|
|
/// @returns true if *this != Val
|
|
/// @brief Inequality operator.
|
|
bool operator!=(uint64_t Val) const {
|
|
return !((*this) == Val);
|
|
}
|
|
|
|
/// Compares this APInt with RHS for the validity of the inequality
|
|
/// relationship.
|
|
/// @returns true if *this != Val
|
|
/// @brief Inequality comparison
|
|
bool ne(const APInt &RHS) const {
|
|
return !((*this) == RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as unsigned quantities and compares them for
|
|
/// the validity of the less-than relationship.
|
|
/// @returns true if *this < RHS when both are considered unsigned.
|
|
/// @brief Unsigned less than comparison
|
|
bool ult(const APInt& RHS) const;
|
|
|
|
/// Regards both *this and RHS as signed quantities and compares them for
|
|
/// validity of the less-than relationship.
|
|
/// @returns true if *this < RHS when both are considered signed.
|
|
/// @brief Signed less than comparison
|
|
bool slt(const APInt& RHS) const;
|
|
|
|
/// Regards both *this and RHS as unsigned quantities and compares them for
|
|
/// validity of the less-or-equal relationship.
|
|
/// @returns true if *this <= RHS when both are considered unsigned.
|
|
/// @brief Unsigned less or equal comparison
|
|
bool ule(const APInt& RHS) const {
|
|
return ult(RHS) || eq(RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as signed quantities and compares them for
|
|
/// validity of the less-or-equal relationship.
|
|
/// @returns true if *this <= RHS when both are considered signed.
|
|
/// @brief Signed less or equal comparison
|
|
bool sle(const APInt& RHS) const {
|
|
return slt(RHS) || eq(RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as unsigned quantities and compares them for
|
|
/// the validity of the greater-than relationship.
|
|
/// @returns true if *this > RHS when both are considered unsigned.
|
|
/// @brief Unsigned greather than comparison
|
|
bool ugt(const APInt& RHS) const {
|
|
return !ult(RHS) && !eq(RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as signed quantities and compares them for
|
|
/// the validity of the greater-than relationship.
|
|
/// @returns true if *this > RHS when both are considered signed.
|
|
/// @brief Signed greather than comparison
|
|
bool sgt(const APInt& RHS) const {
|
|
return !slt(RHS) && !eq(RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as unsigned quantities and compares them for
|
|
/// validity of the greater-or-equal relationship.
|
|
/// @returns true if *this >= RHS when both are considered unsigned.
|
|
/// @brief Unsigned greater or equal comparison
|
|
bool uge(const APInt& RHS) const {
|
|
return !ult(RHS);
|
|
}
|
|
|
|
/// Regards both *this and RHS as signed quantities and compares them for
|
|
/// validity of the greater-or-equal relationship.
|
|
/// @returns true if *this >= RHS when both are considered signed.
|
|
/// @brief Signed greather or equal comparison
|
|
bool sge(const APInt& RHS) const {
|
|
return !slt(RHS);
|
|
}
|
|
|
|
/// This operation tests if there are any pairs of corresponding bits
|
|
/// between this APInt and RHS that are both set.
|
|
bool intersects(const APInt &RHS) const {
|
|
return (*this & RHS) != 0;
|
|
}
|
|
|
|
/// @}
|
|
/// @name Resizing Operators
|
|
/// @{
|
|
/// Truncate the APInt to a specified width. It is an error to specify a width
|
|
/// that is greater than or equal to the current width.
|
|
/// @brief Truncate to new width.
|
|
APInt &trunc(uint32_t width);
|
|
|
|
/// This operation sign extends the APInt to a new width. If the high order
|
|
/// bit is set, the fill on the left will be done with 1 bits, otherwise zero.
|
|
/// It is an error to specify a width that is less than or equal to the
|
|
/// current width.
|
|
/// @brief Sign extend to a new width.
|
|
APInt &sext(uint32_t width);
|
|
|
|
/// This operation zero extends the APInt to a new width. The high order bits
|
|
/// are filled with 0 bits. It is an error to specify a width that is less
|
|
/// than or equal to the current width.
|
|
/// @brief Zero extend to a new width.
|
|
APInt &zext(uint32_t width);
|
|
|
|
/// Make this APInt have the bit width given by \p width. The value is sign
|
|
/// extended, truncated, or left alone to make it that width.
|
|
/// @brief Sign extend or truncate to width
|
|
APInt &sextOrTrunc(uint32_t width);
|
|
|
|
/// Make this APInt have the bit width given by \p width. The value is zero
|
|
/// extended, truncated, or left alone to make it that width.
|
|
/// @brief Zero extend or truncate to width
|
|
APInt &zextOrTrunc(uint32_t width);
|
|
|
|
/// @}
|
|
/// @name Bit Manipulation Operators
|
|
/// @{
|
|
/// @brief Set every bit to 1.
|
|
APInt& set() {
|
|
if (isSingleWord()) {
|
|
VAL = -1ULL;
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
// Set all the bits in all the words.
|
|
for (uint32_t i = 0; i < getNumWords(); ++i)
|
|
pVal[i] = -1ULL;
|
|
// Clear the unused ones
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
/// Set the given bit to 1 whose position is given as "bitPosition".
|
|
/// @brief Set a given bit to 1.
|
|
APInt& set(uint32_t bitPosition);
|
|
|
|
/// @brief Set every bit to 0.
|
|
APInt& clear() {
|
|
if (isSingleWord())
|
|
VAL = 0;
|
|
else
|
|
memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
|
|
return *this;
|
|
}
|
|
|
|
/// Set the given bit to 0 whose position is given as "bitPosition".
|
|
/// @brief Set a given bit to 0.
|
|
APInt& clear(uint32_t bitPosition);
|
|
|
|
/// @brief Toggle every bit to its opposite value.
|
|
APInt& flip() {
|
|
if (isSingleWord()) {
|
|
VAL ^= -1ULL;
|
|
return clearUnusedBits();
|
|
}
|
|
for (uint32_t i = 0; i < getNumWords(); ++i)
|
|
pVal[i] ^= -1ULL;
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
/// Toggle a given bit to its opposite value whose position is given
|
|
/// as "bitPosition".
|
|
/// @brief Toggles a given bit to its opposite value.
|
|
APInt& flip(uint32_t bitPosition);
|
|
|
|
/// @}
|
|
/// @name Value Characterization Functions
|
|
/// @{
|
|
|
|
/// @returns the total number of bits.
|
|
uint32_t getBitWidth() const {
|
|
return BitWidth;
|
|
}
|
|
|
|
/// Here one word's bitwidth equals to that of uint64_t.
|
|
/// @returns the number of words to hold the integer value of this APInt.
|
|
/// @brief Get the number of words.
|
|
uint32_t getNumWords() const {
|
|
return (BitWidth + APINT_BITS_PER_WORD - 1) / APINT_BITS_PER_WORD;
|
|
}
|
|
|
|
/// This function returns the number of active bits which is defined as the
|
|
/// bit width minus the number of leading zeros. This is used in several
|
|
/// computations to see how "wide" the value is.
|
|
/// @brief Compute the number of active bits in the value
|
|
uint32_t getActiveBits() const {
|
|
return BitWidth - countLeadingZeros();
|
|
}
|
|
|
|
/// This function returns the number of active words in the value of this
|
|
/// APInt. This is used in conjunction with getActiveData to extract the raw
|
|
/// value of the APInt.
|
|
uint32_t getActiveWords() const {
|
|
return whichWord(getActiveBits()-1) + 1;
|
|
}
|
|
|
|
/// Computes the minimum bit width for this APInt while considering it to be
|
|
/// a signed (and probably negative) value. If the value is not negative,
|
|
/// this function returns the same value as getActiveBits()+1. Otherwise, it
|
|
/// returns the smallest bit width that will retain the negative value. For
|
|
/// example, -1 can be written as 0b1 or 0xFFFFFFFFFF. 0b1 is shorter and so
|
|
/// for -1, this function will always return 1.
|
|
/// @brief Get the minimum bit size for this signed APInt
|
|
uint32_t getMinSignedBits() const {
|
|
if (isNegative())
|
|
return BitWidth - countLeadingOnes() + 1;
|
|
return getActiveBits()+1;
|
|
}
|
|
|
|
/// This method attempts to return the value of this APInt as a zero extended
|
|
/// uint64_t. The bitwidth must be <= 64 or the value must fit within a
|
|
/// uint64_t. Otherwise an assertion will result.
|
|
/// @brief Get zero extended value
|
|
uint64_t getZExtValue() const {
|
|
if (isSingleWord())
|
|
return VAL;
|
|
assert(getActiveBits() <= 64 && "Too many bits for uint64_t");
|
|
return pVal[0];
|
|
}
|
|
|
|
/// This method attempts to return the value of this APInt as a sign extended
|
|
/// int64_t. The bit width must be <= 64 or the value must fit within an
|
|
/// int64_t. Otherwise an assertion will result.
|
|
/// @brief Get sign extended value
|
|
int64_t getSExtValue() const {
|
|
if (isSingleWord())
|
|
return int64_t(VAL << (APINT_BITS_PER_WORD - BitWidth)) >>
|
|
(APINT_BITS_PER_WORD - BitWidth);
|
|
assert(getActiveBits() <= 64 && "Too many bits for int64_t");
|
|
return int64_t(pVal[0]);
|
|
}
|
|
|
|
/// This method determines how many bits are required to hold the APInt
|
|
/// equivalent of the string given by \p str of length \p slen.
|
|
/// @brief Get bits required for string value.
|
|
static uint32_t getBitsNeeded(const char* str, uint32_t slen, uint8_t radix);
|
|
|
|
/// countLeadingZeros - This function is an APInt version of the
|
|
/// countLeadingZeros_{32,64} functions in MathExtras.h. It counts the number
|
|
/// of zeros from the most significant bit to the first one bit.
|
|
/// @returns BitWidth if the value is zero.
|
|
/// @returns the number of zeros from the most significant bit to the first
|
|
/// one bits.
|
|
uint32_t countLeadingZeros() const {
|
|
if (isSingleWord()) {
|
|
uint32_t unusedBits = APINT_BITS_PER_WORD - BitWidth;
|
|
return CountLeadingZeros_64(VAL) - unusedBits;
|
|
}
|
|
return countLeadingZerosSlowCase();
|
|
}
|
|
|
|
/// countLeadingOnes - This function is an APInt version of the
|
|
/// countLeadingOnes_{32,64} functions in MathExtras.h. It counts the number
|
|
/// of ones from the most significant bit to the first zero bit.
|
|
/// @returns 0 if the high order bit is not set
|
|
/// @returns the number of 1 bits from the most significant to the least
|
|
/// @brief Count the number of leading one bits.
|
|
uint32_t countLeadingOnes() const;
|
|
|
|
/// countTrailingZeros - This function is an APInt version of the
|
|
/// countTrailingZeros_{32,64} functions in MathExtras.h. It counts
|
|
/// the number of zeros from the least significant bit to the first set bit.
|
|
/// @returns BitWidth if the value is zero.
|
|
/// @returns the number of zeros from the least significant bit to the first
|
|
/// one bit.
|
|
/// @brief Count the number of trailing zero bits.
|
|
uint32_t countTrailingZeros() const;
|
|
|
|
/// countTrailingOnes - This function is an APInt version of the
|
|
/// countTrailingOnes_{32,64} functions in MathExtras.h. It counts
|
|
/// the number of ones from the least significant bit to the first zero bit.
|
|
/// @returns BitWidth if the value is all ones.
|
|
/// @returns the number of ones from the least significant bit to the first
|
|
/// zero bit.
|
|
/// @brief Count the number of trailing one bits.
|
|
uint32_t countTrailingOnes() const {
|
|
if (isSingleWord())
|
|
return CountTrailingOnes_64(VAL);
|
|
return countTrailingOnesSlowCase();
|
|
}
|
|
|
|
/// countPopulation - This function is an APInt version of the
|
|
/// countPopulation_{32,64} functions in MathExtras.h. It counts the number
|
|
/// of 1 bits in the APInt value.
|
|
/// @returns 0 if the value is zero.
|
|
/// @returns the number of set bits.
|
|
/// @brief Count the number of bits set.
|
|
uint32_t countPopulation() const {
|
|
if (isSingleWord())
|
|
return CountPopulation_64(VAL);
|
|
return countPopulationSlowCase();
|
|
}
|
|
|
|
/// @}
|
|
/// @name Conversion Functions
|
|
/// @{
|
|
void print(raw_ostream &OS, bool isSigned) const;
|
|
|
|
/// toString - Converts an APInt to a string and append it to Str. Str is
|
|
/// commonly a SmallString.
|
|
void toString(SmallVectorImpl<char> &Str, unsigned Radix, bool Signed) const;
|
|
|
|
/// Considers the APInt to be unsigned and converts it into a string in the
|
|
/// radix given. The radix can be 2, 8, 10 or 16.
|
|
void toStringUnsigned(SmallVectorImpl<char> &Str, unsigned Radix = 10) const {
|
|
return toString(Str, Radix, false);
|
|
}
|
|
|
|
/// Considers the APInt to be signed and converts it into a string in the
|
|
/// radix given. The radix can be 2, 8, 10 or 16.
|
|
void toStringSigned(SmallVectorImpl<char> &Str, unsigned Radix = 10) const {
|
|
return toString(Str, Radix, true);
|
|
}
|
|
|
|
/// toString - This returns the APInt as a std::string. Note that this is an
|
|
/// inefficient method. It is better to pass in a SmallVector/SmallString
|
|
/// to the methods above to avoid thrashing the heap for the string.
|
|
std::string toString(unsigned Radix, bool Signed) const;
|
|
|
|
|
|
/// @returns a byte-swapped representation of this APInt Value.
|
|
APInt byteSwap() const;
|
|
|
|
/// @brief Converts this APInt to a double value.
|
|
double roundToDouble(bool isSigned) const;
|
|
|
|
/// @brief Converts this unsigned APInt to a double value.
|
|
double roundToDouble() const {
|
|
return roundToDouble(false);
|
|
}
|
|
|
|
/// @brief Converts this signed APInt to a double value.
|
|
double signedRoundToDouble() const {
|
|
return roundToDouble(true);
|
|
}
|
|
|
|
/// The conversion does not do a translation from integer to double, it just
|
|
/// re-interprets the bits as a double. Note that it is valid to do this on
|
|
/// any bit width. Exactly 64 bits will be translated.
|
|
/// @brief Converts APInt bits to a double
|
|
double bitsToDouble() const {
|
|
union {
|
|
uint64_t I;
|
|
double D;
|
|
} T;
|
|
T.I = (isSingleWord() ? VAL : pVal[0]);
|
|
return T.D;
|
|
}
|
|
|
|
/// The conversion does not do a translation from integer to float, it just
|
|
/// re-interprets the bits as a float. Note that it is valid to do this on
|
|
/// any bit width. Exactly 32 bits will be translated.
|
|
/// @brief Converts APInt bits to a double
|
|
float bitsToFloat() const {
|
|
union {
|
|
uint32_t I;
|
|
float F;
|
|
} T;
|
|
T.I = uint32_t((isSingleWord() ? VAL : pVal[0]));
|
|
return T.F;
|
|
}
|
|
|
|
/// The conversion does not do a translation from double to integer, it just
|
|
/// re-interprets the bits of the double. Note that it is valid to do this on
|
|
/// any bit width but bits from V may get truncated.
|
|
/// @brief Converts a double to APInt bits.
|
|
APInt& doubleToBits(double V) {
|
|
union {
|
|
uint64_t I;
|
|
double D;
|
|
} T;
|
|
T.D = V;
|
|
if (isSingleWord())
|
|
VAL = T.I;
|
|
else
|
|
pVal[0] = T.I;
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
/// The conversion does not do a translation from float to integer, it just
|
|
/// re-interprets the bits of the float. Note that it is valid to do this on
|
|
/// any bit width but bits from V may get truncated.
|
|
/// @brief Converts a float to APInt bits.
|
|
APInt& floatToBits(float V) {
|
|
union {
|
|
uint32_t I;
|
|
float F;
|
|
} T;
|
|
T.F = V;
|
|
if (isSingleWord())
|
|
VAL = T.I;
|
|
else
|
|
pVal[0] = T.I;
|
|
return clearUnusedBits();
|
|
}
|
|
|
|
/// @}
|
|
/// @name Mathematics Operations
|
|
/// @{
|
|
|
|
/// @returns the floor log base 2 of this APInt.
|
|
uint32_t logBase2() const {
|
|
return BitWidth - 1 - countLeadingZeros();
|
|
}
|
|
|
|
/// @returns the log base 2 of this APInt if its an exact power of two, -1
|
|
/// otherwise
|
|
int32_t exactLogBase2() const {
|
|
if (!isPowerOf2())
|
|
return -1;
|
|
return logBase2();
|
|
}
|
|
|
|
/// @brief Compute the square root
|
|
APInt sqrt() const;
|
|
|
|
/// If *this is < 0 then return -(*this), otherwise *this;
|
|
/// @brief Get the absolute value;
|
|
APInt abs() const {
|
|
if (isNegative())
|
|
return -(*this);
|
|
return *this;
|
|
}
|
|
|
|
/// @returns the multiplicative inverse for a given modulo.
|
|
APInt multiplicativeInverse(const APInt& modulo) const;
|
|
|
|
/// @}
|
|
/// @name Building-block Operations for APInt and APFloat
|
|
/// @{
|
|
|
|
// These building block operations operate on a representation of
|
|
// arbitrary precision, two's-complement, bignum integer values.
|
|
// They should be sufficient to implement APInt and APFloat bignum
|
|
// requirements. Inputs are generally a pointer to the base of an
|
|
// array of integer parts, representing an unsigned bignum, and a
|
|
// count of how many parts there are.
|
|
|
|
/// Sets the least significant part of a bignum to the input value,
|
|
/// and zeroes out higher parts. */
|
|
static void tcSet(integerPart *, integerPart, unsigned int);
|
|
|
|
/// Assign one bignum to another.
|
|
static void tcAssign(integerPart *, const integerPart *, unsigned int);
|
|
|
|
/// Returns true if a bignum is zero, false otherwise.
|
|
static bool tcIsZero(const integerPart *, unsigned int);
|
|
|
|
/// Extract the given bit of a bignum; returns 0 or 1. Zero-based.
|
|
static int tcExtractBit(const integerPart *, unsigned int bit);
|
|
|
|
/// Copy the bit vector of width srcBITS from SRC, starting at bit
|
|
/// srcLSB, to DST, of dstCOUNT parts, such that the bit srcLSB
|
|
/// becomes the least significant bit of DST. All high bits above
|
|
/// srcBITS in DST are zero-filled.
|
|
static void tcExtract(integerPart *, unsigned int dstCount, const integerPart *,
|
|
unsigned int srcBits, unsigned int srcLSB);
|
|
|
|
/// Set the given bit of a bignum. Zero-based.
|
|
static void tcSetBit(integerPart *, unsigned int bit);
|
|
|
|
/// Returns the bit number of the least or most significant set bit
|
|
/// of a number. If the input number has no bits set -1U is
|
|
/// returned.
|
|
static unsigned int tcLSB(const integerPart *, unsigned int);
|
|
static unsigned int tcMSB(const integerPart *parts, unsigned int n);
|
|
|
|
/// Negate a bignum in-place.
|
|
static void tcNegate(integerPart *, unsigned int);
|
|
|
|
/// DST += RHS + CARRY where CARRY is zero or one. Returns the
|
|
/// carry flag.
|
|
static integerPart tcAdd(integerPart *, const integerPart *,
|
|
integerPart carry, unsigned);
|
|
|
|
/// DST -= RHS + CARRY where CARRY is zero or one. Returns the
|
|
/// carry flag.
|
|
static integerPart tcSubtract(integerPart *, const integerPart *,
|
|
integerPart carry, unsigned);
|
|
|
|
/// DST += SRC * MULTIPLIER + PART if add is true
|
|
/// DST = SRC * MULTIPLIER + PART if add is false
|
|
///
|
|
/// Requires 0 <= DSTPARTS <= SRCPARTS + 1. If DST overlaps SRC
|
|
/// they must start at the same point, i.e. DST == SRC.
|
|
///
|
|
/// If DSTPARTS == SRC_PARTS + 1 no overflow occurs and zero is
|
|
/// returned. Otherwise DST is filled with the least significant
|
|
/// DSTPARTS parts of the result, and if all of the omitted higher
|
|
/// parts were zero return zero, otherwise overflow occurred and
|
|
/// return one.
|
|
static int tcMultiplyPart(integerPart *dst, const integerPart *src,
|
|
integerPart multiplier, integerPart carry,
|
|
unsigned int srcParts, unsigned int dstParts,
|
|
bool add);
|
|
|
|
/// DST = LHS * RHS, where DST has the same width as the operands
|
|
/// and is filled with the least significant parts of the result.
|
|
/// Returns one if overflow occurred, otherwise zero. DST must be
|
|
/// disjoint from both operands.
|
|
static int tcMultiply(integerPart *, const integerPart *,
|
|
const integerPart *, unsigned);
|
|
|
|
/// DST = LHS * RHS, where DST has width the sum of the widths of
|
|
/// the operands. No overflow occurs. DST must be disjoint from
|
|
/// both operands. Returns the number of parts required to hold the
|
|
/// result.
|
|
static unsigned int tcFullMultiply(integerPart *, const integerPart *,
|
|
const integerPart *, unsigned, unsigned);
|
|
|
|
/// If RHS is zero LHS and REMAINDER are left unchanged, return one.
|
|
/// Otherwise set LHS to LHS / RHS with the fractional part
|
|
/// discarded, set REMAINDER to the remainder, return zero. i.e.
|
|
///
|
|
/// OLD_LHS = RHS * LHS + REMAINDER
|
|
///
|
|
/// SCRATCH is a bignum of the same size as the operands and result
|
|
/// for use by the routine; its contents need not be initialized
|
|
/// and are destroyed. LHS, REMAINDER and SCRATCH must be
|
|
/// distinct.
|
|
static int tcDivide(integerPart *lhs, const integerPart *rhs,
|
|
integerPart *remainder, integerPart *scratch,
|
|
unsigned int parts);
|
|
|
|
/// Shift a bignum left COUNT bits. Shifted in bits are zero.
|
|
/// There are no restrictions on COUNT.
|
|
static void tcShiftLeft(integerPart *, unsigned int parts,
|
|
unsigned int count);
|
|
|
|
/// Shift a bignum right COUNT bits. Shifted in bits are zero.
|
|
/// There are no restrictions on COUNT.
|
|
static void tcShiftRight(integerPart *, unsigned int parts,
|
|
unsigned int count);
|
|
|
|
/// The obvious AND, OR and XOR and complement operations.
|
|
static void tcAnd(integerPart *, const integerPart *, unsigned int);
|
|
static void tcOr(integerPart *, const integerPart *, unsigned int);
|
|
static void tcXor(integerPart *, const integerPart *, unsigned int);
|
|
static void tcComplement(integerPart *, unsigned int);
|
|
|
|
/// Comparison (unsigned) of two bignums.
|
|
static int tcCompare(const integerPart *, const integerPart *,
|
|
unsigned int);
|
|
|
|
/// Increment a bignum in-place. Return the carry flag.
|
|
static integerPart tcIncrement(integerPart *, unsigned int);
|
|
|
|
/// Set the least significant BITS and clear the rest.
|
|
static void tcSetLeastSignificantBits(integerPart *, unsigned int,
|
|
unsigned int bits);
|
|
|
|
/// @brief debug method
|
|
void dump() const;
|
|
|
|
/// @}
|
|
};
|
|
|
|
inline bool operator==(uint64_t V1, const APInt& V2) {
|
|
return V2 == V1;
|
|
}
|
|
|
|
inline bool operator!=(uint64_t V1, const APInt& V2) {
|
|
return V2 != V1;
|
|
}
|
|
|
|
inline raw_ostream &operator<<(raw_ostream &OS, const APInt &I) {
|
|
I.print(OS, true);
|
|
return OS;
|
|
}
|
|
|
|
namespace APIntOps {
|
|
|
|
/// @brief Determine the smaller of two APInts considered to be signed.
|
|
inline APInt smin(const APInt &A, const APInt &B) {
|
|
return A.slt(B) ? A : B;
|
|
}
|
|
|
|
/// @brief Determine the larger of two APInts considered to be signed.
|
|
inline APInt smax(const APInt &A, const APInt &B) {
|
|
return A.sgt(B) ? A : B;
|
|
}
|
|
|
|
/// @brief Determine the smaller of two APInts considered to be signed.
|
|
inline APInt umin(const APInt &A, const APInt &B) {
|
|
return A.ult(B) ? A : B;
|
|
}
|
|
|
|
/// @brief Determine the larger of two APInts considered to be unsigned.
|
|
inline APInt umax(const APInt &A, const APInt &B) {
|
|
return A.ugt(B) ? A : B;
|
|
}
|
|
|
|
/// @brief Check if the specified APInt has a N-bits unsigned integer value.
|
|
inline bool isIntN(uint32_t N, const APInt& APIVal) {
|
|
return APIVal.isIntN(N);
|
|
}
|
|
|
|
/// @brief Check if the specified APInt has a N-bits signed integer value.
|
|
inline bool isSignedIntN(uint32_t N, const APInt& APIVal) {
|
|
return APIVal.isSignedIntN(N);
|
|
}
|
|
|
|
/// @returns true if the argument APInt value is a sequence of ones
|
|
/// starting at the least significant bit with the remainder zero.
|
|
inline bool isMask(uint32_t numBits, const APInt& APIVal) {
|
|
return numBits <= APIVal.getBitWidth() &&
|
|
APIVal == APInt::getLowBitsSet(APIVal.getBitWidth(), numBits);
|
|
}
|
|
|
|
/// @returns true if the argument APInt value contains a sequence of ones
|
|
/// with the remainder zero.
|
|
inline bool isShiftedMask(uint32_t numBits, const APInt& APIVal) {
|
|
return isMask(numBits, (APIVal - APInt(numBits,1)) | APIVal);
|
|
}
|
|
|
|
/// @returns a byte-swapped representation of the specified APInt Value.
|
|
inline APInt byteSwap(const APInt& APIVal) {
|
|
return APIVal.byteSwap();
|
|
}
|
|
|
|
/// @returns the floor log base 2 of the specified APInt value.
|
|
inline uint32_t logBase2(const APInt& APIVal) {
|
|
return APIVal.logBase2();
|
|
}
|
|
|
|
/// GreatestCommonDivisor - This function returns the greatest common
|
|
/// divisor of the two APInt values using Euclid's algorithm.
|
|
/// @returns the greatest common divisor of Val1 and Val2
|
|
/// @brief Compute GCD of two APInt values.
|
|
APInt GreatestCommonDivisor(const APInt& Val1, const APInt& Val2);
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/// Treats the APInt as an unsigned value for conversion purposes.
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/// @brief Converts the given APInt to a double value.
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inline double RoundAPIntToDouble(const APInt& APIVal) {
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return APIVal.roundToDouble();
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}
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/// Treats the APInt as a signed value for conversion purposes.
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/// @brief Converts the given APInt to a double value.
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inline double RoundSignedAPIntToDouble(const APInt& APIVal) {
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return APIVal.signedRoundToDouble();
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}
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/// @brief Converts the given APInt to a float vlalue.
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inline float RoundAPIntToFloat(const APInt& APIVal) {
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return float(RoundAPIntToDouble(APIVal));
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}
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/// Treast the APInt as a signed value for conversion purposes.
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/// @brief Converts the given APInt to a float value.
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inline float RoundSignedAPIntToFloat(const APInt& APIVal) {
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return float(APIVal.signedRoundToDouble());
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}
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/// RoundDoubleToAPInt - This function convert a double value to an APInt value.
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/// @brief Converts the given double value into a APInt.
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APInt RoundDoubleToAPInt(double Double, uint32_t width);
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/// RoundFloatToAPInt - Converts a float value into an APInt value.
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/// @brief Converts a float value into a APInt.
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inline APInt RoundFloatToAPInt(float Float, uint32_t width) {
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return RoundDoubleToAPInt(double(Float), width);
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}
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/// Arithmetic right-shift the APInt by shiftAmt.
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/// @brief Arithmetic right-shift function.
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inline APInt ashr(const APInt& LHS, uint32_t shiftAmt) {
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return LHS.ashr(shiftAmt);
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}
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/// Logical right-shift the APInt by shiftAmt.
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/// @brief Logical right-shift function.
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inline APInt lshr(const APInt& LHS, uint32_t shiftAmt) {
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return LHS.lshr(shiftAmt);
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}
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/// Left-shift the APInt by shiftAmt.
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/// @brief Left-shift function.
|
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inline APInt shl(const APInt& LHS, uint32_t shiftAmt) {
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return LHS.shl(shiftAmt);
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}
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/// Signed divide APInt LHS by APInt RHS.
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/// @brief Signed division function for APInt.
|
|
inline APInt sdiv(const APInt& LHS, const APInt& RHS) {
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|
return LHS.sdiv(RHS);
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|
}
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/// Unsigned divide APInt LHS by APInt RHS.
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/// @brief Unsigned division function for APInt.
|
|
inline APInt udiv(const APInt& LHS, const APInt& RHS) {
|
|
return LHS.udiv(RHS);
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|
}
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/// Signed remainder operation on APInt.
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/// @brief Function for signed remainder operation.
|
|
inline APInt srem(const APInt& LHS, const APInt& RHS) {
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|
return LHS.srem(RHS);
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}
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/// Unsigned remainder operation on APInt.
|
|
/// @brief Function for unsigned remainder operation.
|
|
inline APInt urem(const APInt& LHS, const APInt& RHS) {
|
|
return LHS.urem(RHS);
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|
}
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/// Performs multiplication on APInt values.
|
|
/// @brief Function for multiplication operation.
|
|
inline APInt mul(const APInt& LHS, const APInt& RHS) {
|
|
return LHS * RHS;
|
|
}
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/// Performs addition on APInt values.
|
|
/// @brief Function for addition operation.
|
|
inline APInt add(const APInt& LHS, const APInt& RHS) {
|
|
return LHS + RHS;
|
|
}
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/// Performs subtraction on APInt values.
|
|
/// @brief Function for subtraction operation.
|
|
inline APInt sub(const APInt& LHS, const APInt& RHS) {
|
|
return LHS - RHS;
|
|
}
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|
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/// Performs bitwise AND operation on APInt LHS and
|
|
/// APInt RHS.
|
|
/// @brief Bitwise AND function for APInt.
|
|
inline APInt And(const APInt& LHS, const APInt& RHS) {
|
|
return LHS & RHS;
|
|
}
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|
|
|
/// Performs bitwise OR operation on APInt LHS and APInt RHS.
|
|
/// @brief Bitwise OR function for APInt.
|
|
inline APInt Or(const APInt& LHS, const APInt& RHS) {
|
|
return LHS | RHS;
|
|
}
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|
|
|
/// Performs bitwise XOR operation on APInt.
|
|
/// @brief Bitwise XOR function for APInt.
|
|
inline APInt Xor(const APInt& LHS, const APInt& RHS) {
|
|
return LHS ^ RHS;
|
|
}
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|
|
|
/// Performs a bitwise complement operation on APInt.
|
|
/// @brief Bitwise complement function.
|
|
inline APInt Not(const APInt& APIVal) {
|
|
return ~APIVal;
|
|
}
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} // End of APIntOps namespace
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} // End of llvm namespace
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#endif
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