mirror of
https://github.com/c64scene-ar/llvm-6502.git
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edfb931edb
is that patterns no longer match for vectors of booleans, because you only get ConstantDataVector when the vector element type is i8, i16, etc, not when it is i1). Original commit message: Remove some dead code and tidy things up now that vectors use ConstantDataVector instead of always using ConstantVector. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150246 91177308-0d34-0410-b5e6-96231b3b80d8
825 lines
24 KiB
C++
825 lines
24 KiB
C++
//===-- llvm/Support/PatternMatch.h - Match on the LLVM IR ------*- 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 provides a simple and efficient mechanism for performing general
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// tree-based pattern matches on the LLVM IR. The power of these routines is
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// that it allows you to write concise patterns that are expressive and easy to
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// understand. The other major advantage of this is that it allows you to
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// trivially capture/bind elements in the pattern to variables. For example,
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// you can do something like this:
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//
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// Value *Exp = ...
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// Value *X, *Y; ConstantInt *C1, *C2; // (X & C1) | (Y & C2)
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// if (match(Exp, m_Or(m_And(m_Value(X), m_ConstantInt(C1)),
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// m_And(m_Value(Y), m_ConstantInt(C2))))) {
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// ... Pattern is matched and variables are bound ...
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// }
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//
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// This is primarily useful to things like the instruction combiner, but can
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// also be useful for static analysis tools or code generators.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PATTERNMATCH_H
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#define LLVM_SUPPORT_PATTERNMATCH_H
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/Operator.h"
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namespace llvm {
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namespace PatternMatch {
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template<typename Val, typename Pattern>
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bool match(Val *V, const Pattern &P) {
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return const_cast<Pattern&>(P).match(V);
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}
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template<typename SubPattern_t>
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struct OneUse_match {
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SubPattern_t SubPattern;
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OneUse_match(const SubPattern_t &SP) : SubPattern(SP) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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return V->hasOneUse() && SubPattern.match(V);
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}
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};
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template<typename T>
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inline OneUse_match<T> m_OneUse(const T &SubPattern) { return SubPattern; }
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template<typename Class>
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struct class_match {
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template<typename ITy>
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bool match(ITy *V) { return isa<Class>(V); }
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};
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/// m_Value() - Match an arbitrary value and ignore it.
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inline class_match<Value> m_Value() { return class_match<Value>(); }
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/// m_ConstantInt() - Match an arbitrary ConstantInt and ignore it.
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inline class_match<ConstantInt> m_ConstantInt() {
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return class_match<ConstantInt>();
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}
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/// m_Undef() - Match an arbitrary undef constant.
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inline class_match<UndefValue> m_Undef() { return class_match<UndefValue>(); }
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inline class_match<Constant> m_Constant() { return class_match<Constant>(); }
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struct match_zero {
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template<typename ITy>
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bool match(ITy *V) {
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if (const Constant *C = dyn_cast<Constant>(V))
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return C->isNullValue();
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return false;
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}
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};
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/// m_Zero() - Match an arbitrary zero/null constant. This includes
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/// zero_initializer for vectors and ConstantPointerNull for pointers.
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inline match_zero m_Zero() { return match_zero(); }
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struct apint_match {
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const APInt *&Res;
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apint_match(const APInt *&R) : Res(R) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
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Res = &CI->getValue();
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return true;
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}
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// FIXME: Remove this.
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if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI =
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dyn_cast_or_null<ConstantInt>(CV->getSplatValue())) {
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Res = &CI->getValue();
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return true;
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}
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if (ConstantDataVector *CV = dyn_cast<ConstantDataVector>(V))
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if (ConstantInt *CI =
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dyn_cast_or_null<ConstantInt>(CV->getSplatValue())) {
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Res = &CI->getValue();
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return true;
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}
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return false;
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}
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};
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/// m_APInt - Match a ConstantInt or splatted ConstantVector, binding the
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/// specified pointer to the contained APInt.
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inline apint_match m_APInt(const APInt *&Res) { return Res; }
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template<int64_t Val>
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struct constantint_match {
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
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const APInt &CIV = CI->getValue();
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if (Val >= 0)
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return CIV == static_cast<uint64_t>(Val);
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// If Val is negative, and CI is shorter than it, truncate to the right
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// number of bits. If it is larger, then we have to sign extend. Just
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// compare their negated values.
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return -CIV == -Val;
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}
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return false;
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}
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};
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/// m_ConstantInt<int64_t> - Match a ConstantInt with a specific value.
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template<int64_t Val>
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inline constantint_match<Val> m_ConstantInt() {
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return constantint_match<Val>();
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}
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/// cst_pred_ty - This helper class is used to match scalar and vector constants
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/// that satisfy a specified predicate.
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template<typename Predicate>
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struct cst_pred_ty : public Predicate {
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
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return this->isValue(CI->getValue());
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// FIXME: Remove this.
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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return this->isValue(CI->getValue());
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if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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return this->isValue(CI->getValue());
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return false;
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}
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};
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/// api_pred_ty - This helper class is used to match scalar and vector constants
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/// that satisfy a specified predicate, and bind them to an APInt.
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template<typename Predicate>
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struct api_pred_ty : public Predicate {
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const APInt *&Res;
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api_pred_ty(const APInt *&R) : Res(R) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
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if (this->isValue(CI->getValue())) {
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Res = &CI->getValue();
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return true;
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}
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// FIXME: remove.
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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if (this->isValue(CI->getValue())) {
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Res = &CI->getValue();
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return true;
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}
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if (const ConstantDataVector *CV = dyn_cast<ConstantDataVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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if (this->isValue(CI->getValue())) {
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Res = &CI->getValue();
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return true;
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}
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return false;
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}
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};
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struct is_one {
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bool isValue(const APInt &C) { return C == 1; }
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};
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/// m_One() - Match an integer 1 or a vector with all elements equal to 1.
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inline cst_pred_ty<is_one> m_One() { return cst_pred_ty<is_one>(); }
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inline api_pred_ty<is_one> m_One(const APInt *&V) { return V; }
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struct is_all_ones {
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bool isValue(const APInt &C) { return C.isAllOnesValue(); }
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};
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/// m_AllOnes() - Match an integer or vector with all bits set to true.
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inline cst_pred_ty<is_all_ones> m_AllOnes() {return cst_pred_ty<is_all_ones>();}
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inline api_pred_ty<is_all_ones> m_AllOnes(const APInt *&V) { return V; }
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struct is_sign_bit {
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bool isValue(const APInt &C) { return C.isSignBit(); }
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};
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/// m_SignBit() - Match an integer or vector with only the sign bit(s) set.
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inline cst_pred_ty<is_sign_bit> m_SignBit() {return cst_pred_ty<is_sign_bit>();}
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inline api_pred_ty<is_sign_bit> m_SignBit(const APInt *&V) { return V; }
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struct is_power2 {
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bool isValue(const APInt &C) { return C.isPowerOf2(); }
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};
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/// m_Power2() - Match an integer or vector power of 2.
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inline cst_pred_ty<is_power2> m_Power2() { return cst_pred_ty<is_power2>(); }
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inline api_pred_ty<is_power2> m_Power2(const APInt *&V) { return V; }
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template<typename Class>
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struct bind_ty {
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Class *&VR;
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bind_ty(Class *&V) : VR(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (Class *CV = dyn_cast<Class>(V)) {
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VR = CV;
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return true;
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}
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return false;
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}
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};
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/// m_Value - Match a value, capturing it if we match.
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inline bind_ty<Value> m_Value(Value *&V) { return V; }
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/// m_ConstantInt - Match a ConstantInt, capturing the value if we match.
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inline bind_ty<ConstantInt> m_ConstantInt(ConstantInt *&CI) { return CI; }
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/// m_Constant - Match a Constant, capturing the value if we match.
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inline bind_ty<Constant> m_Constant(Constant *&C) { return C; }
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/// specificval_ty - Match a specified Value*.
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struct specificval_ty {
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const Value *Val;
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specificval_ty(const Value *V) : Val(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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return V == Val;
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}
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};
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/// m_Specific - Match if we have a specific specified value.
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inline specificval_ty m_Specific(const Value *V) { return V; }
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struct bind_const_intval_ty {
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uint64_t &VR;
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bind_const_intval_ty(uint64_t &V) : VR(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (ConstantInt *CV = dyn_cast<ConstantInt>(V))
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if (CV->getBitWidth() <= 64) {
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VR = CV->getZExtValue();
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return true;
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}
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return false;
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}
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};
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/// m_ConstantInt - Match a ConstantInt and bind to its value. This does not
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/// match ConstantInts wider than 64-bits.
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inline bind_const_intval_ty m_ConstantInt(uint64_t &V) { return V; }
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//===----------------------------------------------------------------------===//
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// Matchers for specific binary operators.
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//
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template<typename LHS_t, typename RHS_t, unsigned Opcode>
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struct BinaryOp_match {
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LHS_t L;
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RHS_t R;
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BinaryOp_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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if (V->getValueID() == Value::InstructionVal + Opcode) {
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BinaryOperator *I = cast<BinaryOperator>(V);
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return L.match(I->getOperand(0)) && R.match(I->getOperand(1));
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
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R.match(CE->getOperand(1));
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return false;
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}
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};
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Add>
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m_Add(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Add>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FAdd>
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m_FAdd(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FAdd>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Sub>
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m_Sub(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Sub>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FSub>
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m_FSub(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FSub>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Mul>
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m_Mul(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Mul>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FMul>
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m_FMul(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FMul>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::UDiv>
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m_UDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::UDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::SDiv>
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m_SDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::SDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FDiv>
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m_FDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::URem>
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m_URem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::URem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::SRem>
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m_SRem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::SRem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FRem>
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m_FRem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FRem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::And>
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m_And(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::And>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Or>
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m_Or(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Or>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Xor>
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m_Xor(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Xor>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Shl>
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m_Shl(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Shl>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::LShr>
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m_LShr(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::LShr>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::AShr>
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m_AShr(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::AShr>(L, R);
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}
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//===----------------------------------------------------------------------===//
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// Class that matches two different binary ops.
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//
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template<typename LHS_t, typename RHS_t, unsigned Opc1, unsigned Opc2>
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struct BinOp2_match {
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LHS_t L;
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RHS_t R;
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BinOp2_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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if (V->getValueID() == Value::InstructionVal + Opc1 ||
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V->getValueID() == Value::InstructionVal + Opc2) {
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BinaryOperator *I = cast<BinaryOperator>(V);
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return L.match(I->getOperand(0)) && R.match(I->getOperand(1));
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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return (CE->getOpcode() == Opc1 || CE->getOpcode() == Opc2) &&
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L.match(CE->getOperand(0)) && R.match(CE->getOperand(1));
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return false;
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}
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};
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/// m_Shr - Matches LShr or AShr.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::AShr>
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m_Shr(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::AShr>(L, R);
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}
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/// m_LogicalShift - Matches LShr or Shl.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::Shl>
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m_LogicalShift(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::Shl>(L, R);
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}
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/// m_IDiv - Matches UDiv and SDiv.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::SDiv, Instruction::UDiv>
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m_IDiv(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::SDiv, Instruction::UDiv>(L, R);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Class that matches exact binary ops.
|
|
//
|
|
template<typename SubPattern_t>
|
|
struct Exact_match {
|
|
SubPattern_t SubPattern;
|
|
|
|
Exact_match(const SubPattern_t &SP) : SubPattern(SP) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (PossiblyExactOperator *PEO = dyn_cast<PossiblyExactOperator>(V))
|
|
return PEO->isExact() && SubPattern.match(V);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename T>
|
|
inline Exact_match<T> m_Exact(const T &SubPattern) { return SubPattern; }
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for CmpInst classes
|
|
//
|
|
|
|
template<typename LHS_t, typename RHS_t, typename Class, typename PredicateTy>
|
|
struct CmpClass_match {
|
|
PredicateTy &Predicate;
|
|
LHS_t L;
|
|
RHS_t R;
|
|
|
|
CmpClass_match(PredicateTy &Pred, const LHS_t &LHS, const RHS_t &RHS)
|
|
: Predicate(Pred), L(LHS), R(RHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (Class *I = dyn_cast<Class>(V))
|
|
if (L.match(I->getOperand(0)) && R.match(I->getOperand(1))) {
|
|
Predicate = I->getPredicate();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline CmpClass_match<LHS, RHS, ICmpInst, ICmpInst::Predicate>
|
|
m_ICmp(ICmpInst::Predicate &Pred, const LHS &L, const RHS &R) {
|
|
return CmpClass_match<LHS, RHS,
|
|
ICmpInst, ICmpInst::Predicate>(Pred, L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline CmpClass_match<LHS, RHS, FCmpInst, FCmpInst::Predicate>
|
|
m_FCmp(FCmpInst::Predicate &Pred, const LHS &L, const RHS &R) {
|
|
return CmpClass_match<LHS, RHS,
|
|
FCmpInst, FCmpInst::Predicate>(Pred, L, R);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for SelectInst classes
|
|
//
|
|
|
|
template<typename Cond_t, typename LHS_t, typename RHS_t>
|
|
struct SelectClass_match {
|
|
Cond_t C;
|
|
LHS_t L;
|
|
RHS_t R;
|
|
|
|
SelectClass_match(const Cond_t &Cond, const LHS_t &LHS,
|
|
const RHS_t &RHS)
|
|
: C(Cond), L(LHS), R(RHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (SelectInst *I = dyn_cast<SelectInst>(V))
|
|
return C.match(I->getOperand(0)) &&
|
|
L.match(I->getOperand(1)) &&
|
|
R.match(I->getOperand(2));
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename Cond, typename LHS, typename RHS>
|
|
inline SelectClass_match<Cond, LHS, RHS>
|
|
m_Select(const Cond &C, const LHS &L, const RHS &R) {
|
|
return SelectClass_match<Cond, LHS, RHS>(C, L, R);
|
|
}
|
|
|
|
/// m_SelectCst - This matches a select of two constants, e.g.:
|
|
/// m_SelectCst<-1, 0>(m_Value(V))
|
|
template<int64_t L, int64_t R, typename Cond>
|
|
inline SelectClass_match<Cond, constantint_match<L>, constantint_match<R> >
|
|
m_SelectCst(const Cond &C) {
|
|
return m_Select(C, m_ConstantInt<L>(), m_ConstantInt<R>());
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for CastInst classes
|
|
//
|
|
|
|
template<typename Op_t, unsigned Opcode>
|
|
struct CastClass_match {
|
|
Op_t Op;
|
|
|
|
CastClass_match(const Op_t &OpMatch) : Op(OpMatch) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (Operator *O = dyn_cast<Operator>(V))
|
|
return O->getOpcode() == Opcode && Op.match(O->getOperand(0));
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// m_BitCast
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::BitCast>
|
|
m_BitCast(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::BitCast>(Op);
|
|
}
|
|
|
|
/// m_PtrToInt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::PtrToInt>
|
|
m_PtrToInt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::PtrToInt>(Op);
|
|
}
|
|
|
|
/// m_Trunc
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::Trunc>
|
|
m_Trunc(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::Trunc>(Op);
|
|
}
|
|
|
|
/// m_SExt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::SExt>
|
|
m_SExt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::SExt>(Op);
|
|
}
|
|
|
|
/// m_ZExt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::ZExt>
|
|
m_ZExt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::ZExt>(Op);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for unary operators
|
|
//
|
|
|
|
template<typename LHS_t>
|
|
struct not_match {
|
|
LHS_t L;
|
|
|
|
not_match(const LHS_t &LHS) : L(LHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (Operator *O = dyn_cast<Operator>(V))
|
|
if (O->getOpcode() == Instruction::Xor)
|
|
return matchIfNot(O->getOperand(0), O->getOperand(1));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfNot(Value *LHS, Value *RHS) {
|
|
return (isa<ConstantInt>(RHS) || isa<ConstantDataVector>(RHS) ||
|
|
// FIXME: Remove CV.
|
|
isa<ConstantVector>(RHS)) &&
|
|
cast<Constant>(RHS)->isAllOnesValue() &&
|
|
L.match(LHS);
|
|
}
|
|
};
|
|
|
|
template<typename LHS>
|
|
inline not_match<LHS> m_Not(const LHS &L) { return L; }
|
|
|
|
|
|
template<typename LHS_t>
|
|
struct neg_match {
|
|
LHS_t L;
|
|
|
|
neg_match(const LHS_t &LHS) : L(LHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (Operator *O = dyn_cast<Operator>(V))
|
|
if (O->getOpcode() == Instruction::Sub)
|
|
return matchIfNeg(O->getOperand(0), O->getOperand(1));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfNeg(Value *LHS, Value *RHS) {
|
|
return ((isa<ConstantInt>(LHS) && cast<ConstantInt>(LHS)->isZero()) ||
|
|
isa<ConstantAggregateZero>(LHS)) &&
|
|
L.match(RHS);
|
|
}
|
|
};
|
|
|
|
/// m_Neg - Match an integer negate.
|
|
template<typename LHS>
|
|
inline neg_match<LHS> m_Neg(const LHS &L) { return L; }
|
|
|
|
|
|
template<typename LHS_t>
|
|
struct fneg_match {
|
|
LHS_t L;
|
|
|
|
fneg_match(const LHS_t &LHS) : L(LHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (Operator *O = dyn_cast<Operator>(V))
|
|
if (O->getOpcode() == Instruction::FSub)
|
|
return matchIfFNeg(O->getOperand(0), O->getOperand(1));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfFNeg(Value *LHS, Value *RHS) {
|
|
if (ConstantFP *C = dyn_cast<ConstantFP>(LHS))
|
|
return C->isNegativeZeroValue() && L.match(RHS);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// m_FNeg - Match a floating point negate.
|
|
template<typename LHS>
|
|
inline fneg_match<LHS> m_FNeg(const LHS &L) { return L; }
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for control flow.
|
|
//
|
|
|
|
template<typename Cond_t>
|
|
struct brc_match {
|
|
Cond_t Cond;
|
|
BasicBlock *&T, *&F;
|
|
brc_match(const Cond_t &C, BasicBlock *&t, BasicBlock *&f)
|
|
: Cond(C), T(t), F(f) {
|
|
}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (BranchInst *BI = dyn_cast<BranchInst>(V))
|
|
if (BI->isConditional() && Cond.match(BI->getCondition())) {
|
|
T = BI->getSuccessor(0);
|
|
F = BI->getSuccessor(1);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename Cond_t>
|
|
inline brc_match<Cond_t> m_Br(const Cond_t &C, BasicBlock *&T, BasicBlock *&F) {
|
|
return brc_match<Cond_t>(C, T, F);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for max/min idioms, eg: "select (sgt x, y), x, y" -> smax(x,y).
|
|
//
|
|
|
|
template<typename LHS_t, typename RHS_t, typename Pred_t>
|
|
struct MaxMin_match {
|
|
LHS_t L;
|
|
RHS_t R;
|
|
|
|
MaxMin_match(const LHS_t &LHS, const RHS_t &RHS)
|
|
: L(LHS), R(RHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
// Look for "(x pred y) ? x : y" or "(x pred y) ? y : x".
|
|
SelectInst *SI = dyn_cast<SelectInst>(V);
|
|
if (!SI)
|
|
return false;
|
|
ICmpInst *Cmp = dyn_cast<ICmpInst>(SI->getCondition());
|
|
if (!Cmp)
|
|
return false;
|
|
// At this point we have a select conditioned on a comparison. Check that
|
|
// it is the values returned by the select that are being compared.
|
|
Value *TrueVal = SI->getTrueValue();
|
|
Value *FalseVal = SI->getFalseValue();
|
|
Value *LHS = Cmp->getOperand(0);
|
|
Value *RHS = Cmp->getOperand(1);
|
|
if ((TrueVal != LHS || FalseVal != RHS) &&
|
|
(TrueVal != RHS || FalseVal != LHS))
|
|
return false;
|
|
ICmpInst::Predicate Pred = LHS == TrueVal ?
|
|
Cmp->getPredicate() : Cmp->getSwappedPredicate();
|
|
// Does "(x pred y) ? x : y" represent the desired max/min operation?
|
|
if (!Pred_t::match(Pred))
|
|
return false;
|
|
// It does! Bind the operands.
|
|
return L.match(LHS) && R.match(RHS);
|
|
}
|
|
};
|
|
|
|
/// smax_pred_ty - Helper class for identifying signed max predicates.
|
|
struct smax_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_SGT || Pred == CmpInst::ICMP_SGE;
|
|
}
|
|
};
|
|
|
|
/// smin_pred_ty - Helper class for identifying signed min predicates.
|
|
struct smin_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_SLT || Pred == CmpInst::ICMP_SLE;
|
|
}
|
|
};
|
|
|
|
/// umax_pred_ty - Helper class for identifying unsigned max predicates.
|
|
struct umax_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_UGT || Pred == CmpInst::ICMP_UGE;
|
|
}
|
|
};
|
|
|
|
/// umin_pred_ty - Helper class for identifying unsigned min predicates.
|
|
struct umin_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_ULT || Pred == CmpInst::ICMP_ULE;
|
|
}
|
|
};
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, smax_pred_ty>
|
|
m_SMax(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, smax_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, smin_pred_ty>
|
|
m_SMin(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, smin_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, umax_pred_ty>
|
|
m_UMax(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, umax_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, umin_pred_ty>
|
|
m_UMin(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, umin_pred_ty>(L, R);
|
|
}
|
|
|
|
} // end namespace PatternMatch
|
|
} // end namespace llvm
|
|
|
|
#endif
|