mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-09 10:29:25 +00:00
Modify APFloat to take a StringRef instead of a c string.
This also adds unit tests to APFloat that mainly tests the string handling of APFloat, but not much else of it's api. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79210 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Erick Tryzelaar
parent
1b9104ff80
commit
a15d890c34
@ -109,6 +109,7 @@ namespace llvm {
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typedef signed short exponent_t;
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struct fltSemantics;
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struct StringRef;
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/* When bits of a floating point number are truncated, this enum is
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used to indicate what fraction of the LSB those bits represented.
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@ -172,7 +173,7 @@ namespace llvm {
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};
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// Constructors.
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APFloat(const fltSemantics &, const char *);
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APFloat(const fltSemantics &, const StringRef &);
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APFloat(const fltSemantics &, integerPart);
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APFloat(const fltSemantics &, fltCategory, bool negative, unsigned type=0);
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explicit APFloat(double d);
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@ -234,7 +235,7 @@ namespace llvm {
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bool, roundingMode);
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opStatus convertFromZeroExtendedInteger(const integerPart *, unsigned int,
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bool, roundingMode);
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opStatus convertFromString(const char *, roundingMode);
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opStatus convertFromString(const StringRef&, roundingMode);
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APInt bitcastToAPInt() const;
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double convertToDouble() const;
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float convertToFloat() const;
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@ -312,8 +313,8 @@ namespace llvm {
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roundingMode, bool *) const;
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opStatus convertFromUnsignedParts(const integerPart *, unsigned int,
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roundingMode);
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opStatus convertFromHexadecimalString(const char *, roundingMode);
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opStatus convertFromDecimalString (const char *, roundingMode);
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opStatus convertFromHexadecimalString(const StringRef&, roundingMode);
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opStatus convertFromDecimalString (const StringRef&, roundingMode);
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char *convertNormalToHexString(char *, unsigned int, bool,
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roundingMode) const;
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opStatus roundSignificandWithExponent(const integerPart *, unsigned int,
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@ -13,6 +13,7 @@
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/APFloat.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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@ -123,27 +124,30 @@ assertArithmeticOK(const llvm::fltSemantics &semantics) {
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If the exponent overflows, returns a large exponent with the
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appropriate sign. */
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static int
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readExponent(const char *p)
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readExponent(StringRef::iterator begin, StringRef::iterator end)
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{
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bool isNegative;
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unsigned int absExponent;
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const unsigned int overlargeExponent = 24000; /* FIXME. */
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StringRef::iterator p = begin;
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assert(p != end && "Exponent has no digits");
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isNegative = (*p == '-');
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if (*p == '-' || *p == '+')
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if (*p == '-' || *p == '+') {
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p++;
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assert(p != end && "Exponent has no digits");
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}
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absExponent = decDigitValue(*p++);
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assert (absExponent < 10U);
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assert(absExponent < 10U && "Invalid character in exponent");
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for (;;) {
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for (; p != end; ++p) {
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unsigned int value;
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value = decDigitValue(*p);
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if (value >= 10U)
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break;
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assert(value < 10U && "Invalid character in exponent");
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p++;
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value += absExponent * 10;
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if (absExponent >= overlargeExponent) {
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absExponent = overlargeExponent;
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@ -152,6 +156,8 @@ readExponent(const char *p)
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absExponent = value;
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}
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assert(p == end && "Invalid exponent in exponent");
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if (isNegative)
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return -(int) absExponent;
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else
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@ -161,7 +167,8 @@ readExponent(const char *p)
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/* This is ugly and needs cleaning up, but I don't immediately see
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how whilst remaining safe. */
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static int
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totalExponent(const char *p, int exponentAdjustment)
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totalExponent(StringRef::iterator p, StringRef::iterator end,
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int exponentAdjustment)
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{
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int unsignedExponent;
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bool negative, overflow;
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@ -175,14 +182,12 @@ totalExponent(const char *p, int exponentAdjustment)
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unsignedExponent = 0;
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overflow = false;
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for(;;) {
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for(; p != end; ++p) {
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unsigned int value;
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value = decDigitValue(*p);
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if(value >= 10U)
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break;
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assert(value < 10U && "Invalid character in exponent");
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p++;
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unsignedExponent = unsignedExponent * 10 + value;
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if(unsignedExponent > 65535)
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overflow = true;
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@ -206,16 +211,21 @@ totalExponent(const char *p, int exponentAdjustment)
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return exponent;
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}
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static const char *
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skipLeadingZeroesAndAnyDot(const char *p, const char **dot)
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static StringRef::iterator
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skipLeadingZeroesAndAnyDot(StringRef::iterator begin, StringRef::iterator end,
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StringRef::iterator *dot)
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{
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*dot = 0;
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while(*p == '0')
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StringRef::iterator p = begin;
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*dot = end;
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while(*p == '0' && p != end)
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p++;
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if(*p == '.') {
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*dot = p++;
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while(*p == '0')
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assert(end - begin != 1 && "String cannot be just a dot");
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while(*p == '0' && p != end)
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p++;
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}
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@ -243,41 +253,50 @@ struct decimalInfo {
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};
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static void
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interpretDecimal(const char *p, decimalInfo *D)
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interpretDecimal(StringRef::iterator begin, StringRef::iterator end,
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decimalInfo *D)
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{
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const char *dot;
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p = skipLeadingZeroesAndAnyDot (p, &dot);
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StringRef::iterator dot = end;
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StringRef::iterator p = skipLeadingZeroesAndAnyDot (begin, end, &dot);
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D->firstSigDigit = p;
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D->exponent = 0;
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D->normalizedExponent = 0;
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for (;;) {
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for (; p != end; ++p) {
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if (*p == '.') {
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assert(dot == 0);
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assert(dot == end && "Multiple dots in float");
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dot = p++;
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if (p == end)
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break;
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}
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if (decDigitValue(*p) >= 10U)
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break;
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p++;
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}
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/* If number is all zerooes accept any exponent. */
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if (p != D->firstSigDigit) {
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if (*p == 'e' || *p == 'E')
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D->exponent = readExponent(p + 1);
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if (p != end) {
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assert((*p == 'e' || *p == 'E') && "Invalid character in digit string");
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/* p points to the first non-digit in the string */
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if (*p == 'e' || *p == 'E') {
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D->exponent = readExponent(p + 1, end);
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}
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/* Implied decimal point? */
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if (!dot)
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if (dot == end)
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dot = p;
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}
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/* If number is all zeroes accept any exponent. */
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if (p != D->firstSigDigit) {
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/* Drop insignificant trailing zeroes. */
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do
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if (p != begin) {
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do
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p--;
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while (*p == '0');
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while (*p == '.');
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do
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p--;
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while (p != begin && *p == '0');
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while (p != begin && *p == '.');
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}
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/* Adjust the exponents for any decimal point. */
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D->exponent += static_cast<exponent_t>((dot - p) - (dot > p));
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@ -293,7 +312,8 @@ interpretDecimal(const char *p, decimalInfo *D)
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DIGITVALUE is the first hex digit of the fraction, P points to
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the next digit. */
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static lostFraction
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trailingHexadecimalFraction(const char *p, unsigned int digitValue)
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trailingHexadecimalFraction(StringRef::iterator p, StringRef::iterator end,
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unsigned int digitValue)
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{
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unsigned int hexDigit;
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@ -308,6 +328,8 @@ trailingHexadecimalFraction(const char *p, unsigned int digitValue)
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while(*p == '0')
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p++;
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assert(p != end && "Invalid trailing hexadecimal fraction!");
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hexDigit = hexDigitValue(*p);
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/* If we ran off the end it is exactly zero or one-half, otherwise
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@ -681,7 +703,7 @@ APFloat::APFloat(const fltSemantics &ourSemantics,
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makeNaN(type);
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}
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APFloat::APFloat(const fltSemantics &ourSemantics, const char *text)
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APFloat::APFloat(const fltSemantics &ourSemantics, const StringRef& text)
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{
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assertArithmeticOK(ourSemantics);
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initialize(&ourSemantics);
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@ -2107,13 +2129,13 @@ APFloat::convertFromZeroExtendedInteger(const integerPart *parts,
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}
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APFloat::opStatus
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APFloat::convertFromHexadecimalString(const char *p,
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APFloat::convertFromHexadecimalString(const StringRef &s,
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roundingMode rounding_mode)
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{
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lostFraction lost_fraction;
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integerPart *significand;
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unsigned int bitPos, partsCount;
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const char *dot, *firstSignificantDigit;
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StringRef::iterator dot, firstSignificantDigit;
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zeroSignificand();
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exponent = 0;
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@ -2124,10 +2146,10 @@ APFloat::convertFromHexadecimalString(const char *p,
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bitPos = partsCount * integerPartWidth;
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/* Skip leading zeroes and any (hexa)decimal point. */
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p = skipLeadingZeroesAndAnyDot(p, &dot);
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StringRef::iterator p = skipLeadingZeroesAndAnyDot(s.begin(), s.end(), &dot);
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firstSignificantDigit = p;
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for(;;) {
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for(; p != s.end();) {
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integerPart hex_value;
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if(*p == '.') {
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@ -2143,21 +2165,26 @@ APFloat::convertFromHexadecimalString(const char *p,
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p++;
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/* Store the number whilst 4-bit nibbles remain. */
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if(bitPos) {
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bitPos -= 4;
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hex_value <<= bitPos % integerPartWidth;
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significand[bitPos / integerPartWidth] |= hex_value;
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} else {
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lost_fraction = trailingHexadecimalFraction(p, hex_value);
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while(hexDigitValue(*p) != -1U)
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p++;
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if (p == s.end()) {
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break;
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} else {
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/* Store the number whilst 4-bit nibbles remain. */
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if(bitPos) {
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bitPos -= 4;
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hex_value <<= bitPos % integerPartWidth;
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significand[bitPos / integerPartWidth] |= hex_value;
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} else {
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lost_fraction = trailingHexadecimalFraction(p, s.end(), hex_value);
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while(p != s.end() && hexDigitValue(*p) != -1U)
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p++;
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break;
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}
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}
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}
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/* Hex floats require an exponent but not a hexadecimal point. */
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assert(*p == 'p' || *p == 'P');
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assert(p != s.end() && (*p == 'p' || *p == 'P') &&
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"Hex strings require an exponent");
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/* Ignore the exponent if we are zero. */
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if(p != firstSignificantDigit) {
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@ -2180,7 +2207,7 @@ APFloat::convertFromHexadecimalString(const char *p,
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expAdjustment -= partsCount * integerPartWidth;
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/* Adjust for the given exponent. */
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exponent = totalExponent(p, expAdjustment);
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exponent = totalExponent(p, s.end(), expAdjustment);
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}
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return normalize(rounding_mode, lost_fraction);
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@ -2272,13 +2299,14 @@ APFloat::roundSignificandWithExponent(const integerPart *decSigParts,
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}
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APFloat::opStatus
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APFloat::convertFromDecimalString(const char *p, roundingMode rounding_mode)
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APFloat::convertFromDecimalString(const StringRef &str, roundingMode rounding_mode)
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{
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decimalInfo D;
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opStatus fs;
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/* Scan the text. */
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interpretDecimal(p, &D);
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StringRef::iterator p = str.begin();
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interpretDecimal(p, str.end(), &D);
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/* Handle the quick cases. First the case of no significant digits,
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i.e. zero, and then exponents that are obviously too large or too
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@ -2333,10 +2361,14 @@ APFloat::convertFromDecimalString(const char *p, roundingMode rounding_mode)
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multiplier = 1;
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do {
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if (*p == '.')
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if (*p == '.') {
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p++;
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if (p == str.end()) {
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break;
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}
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}
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decValue = decDigitValue(*p++);
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assert(decValue < 10U && "Invalid character in digit string");
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multiplier *= 10;
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val = val * 10 + decValue;
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/* The maximum number that can be multiplied by ten with any
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@ -2364,20 +2396,31 @@ APFloat::convertFromDecimalString(const char *p, roundingMode rounding_mode)
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}
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APFloat::opStatus
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APFloat::convertFromString(const char *p, roundingMode rounding_mode)
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APFloat::convertFromString(const StringRef &str, roundingMode rounding_mode)
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{
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assertArithmeticOK(*semantics);
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assert(!str.empty() && "Invalid string length");
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/* Handle a leading minus sign. */
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if(*p == '-')
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sign = 1, p++;
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else
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StringRef::iterator p = str.begin();
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size_t slen = str.size();
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unsigned isNegative = str.front() == '-';
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if(isNegative) {
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sign = 1;
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p++;
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slen--;
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assert(slen && "String is only a minus!");
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} else {
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sign = 0;
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}
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if(p[0] == '0' && (p[1] == 'x' || p[1] == 'X'))
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return convertFromHexadecimalString(p + 2, rounding_mode);
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if(slen >= 2 && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
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assert(slen - 2 && "Invalid string");
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return convertFromHexadecimalString(str.substr(isNegative + 2),
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rounding_mode);
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}
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return convertFromDecimalString(p, rounding_mode);
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return convertFromDecimalString(str.substr(isNegative), rounding_mode);
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}
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/* Write out a hexadecimal representation of the floating point value
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@ -2744,7 +2787,7 @@ APFloat::bitcastToAPInt() const
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float
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APFloat::convertToFloat() const
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{
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assert(semantics == (const llvm::fltSemantics*)&IEEEsingle);
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assert(semantics == (const llvm::fltSemantics*)&IEEEsingle && "Float semantics are not IEEEsingle");
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APInt api = bitcastToAPInt();
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return api.bitsToFloat();
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}
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@ -2752,7 +2795,7 @@ APFloat::convertToFloat() const
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double
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APFloat::convertToDouble() const
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{
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assert(semantics == (const llvm::fltSemantics*)&IEEEdouble);
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assert(semantics == (const llvm::fltSemantics*)&IEEEdouble && "Float semantics are not IEEEdouble");
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APInt api = bitcastToAPInt();
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return api.bitsToDouble();
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}
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106
unittests/ADT/APFloatTest.cpp
Normal file
106
unittests/ADT/APFloatTest.cpp
Normal file
@ -0,0 +1,106 @@
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//===- llvm/unittest/ADT/APFloat.cpp - APFloat unit tests ---------------------===//
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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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#include <ostream>
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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#include "llvm/ADT/APFloat.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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namespace {
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TEST(APFloatTest, Zero) {
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ASSERT_EQ(0.0f, APFloat(APFloat::IEEEsingle, 0.0f).convertToFloat());
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ASSERT_EQ(-0.0f, APFloat(APFloat::IEEEsingle, -0.0f).convertToFloat());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, 0.0).convertToDouble());
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ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, -0.0).convertToDouble());
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}
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TEST(APFloatTest, SemanticsDeath) {
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ASSERT_DEATH(APFloat(APFloat::IEEEsingle, 0.0f).convertToDouble(), "Float semantics are not IEEEdouble");
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ASSERT_DEATH(APFloat(APFloat::IEEEdouble, 0.0 ).convertToFloat(), "Float semantics are not IEEEsingle");
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}
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TEST(APFloatTest, fromString) {
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, ".0").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.0").convertToDouble());
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ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-0").convertToDouble());
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ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-0.").convertToDouble());
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ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-.0").convertToDouble());
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ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-0.0").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0e1234").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0e1234").convertToDouble());
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "00000.").convertToDouble());
|
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0000.00000").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, ".00000").convertToDouble());
|
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.").convertToDouble());
|
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ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.e1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.e+1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0.e-1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "000.0000e0").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "000.0000e-0").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "000.0000e1234").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "000.0000e-1234").convertToDouble());
|
||||
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0p1").convertToDouble());
|
||||
ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-0x0p1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x00000.p1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0000.00000p1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x.00000p1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0.p1").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0p1234").convertToDouble());
|
||||
ASSERT_EQ(-0.0, APFloat(APFloat::IEEEdouble, "-0x0p1234").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x00000.p1234").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0000.00000p1234").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x.00000p1234").convertToDouble());
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, "0x0.p1234").convertToDouble());
|
||||
|
||||
ASSERT_EQ(0.0, APFloat(APFloat::IEEEdouble, StringRef("0e1\02", 3)).convertToDouble());
|
||||
}
|
||||
|
||||
TEST(APFloatTest, StringDeath) {
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, ""), "Invalid string length");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "-"), "String is only a minus!");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0x"), "Invalid string");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "."), "String cannot be just a dot");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "-."), "String cannot be just a dot");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0x."), "String cannot be just a dot");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "-0x."),"String cannot be just a dot");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0x0"), "Hex strings require an exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0e"), "Exponent has no digits");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0e+"), "Exponent has no digits");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0e-"), "Exponent has no digits");
|
||||
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("\0", 1)), "Invalid character in digit string");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1\0", 2)), "Invalid character in digit string");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1\02", 3)), "Invalid character in digit string");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1\02e1", 5)), "Invalid character in digit string");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1e\0", 3)), "Invalid character in exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1e1\0", 4)), "Invalid character in exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("1e1\02", 5)), "Invalid character in exponent");
|
||||
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "1.0f"), "Invalid character in digit string");
|
||||
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x\0", 3)), "Hex strings require an exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1\0", 4)), "Hex strings require an exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1\02", 5)), "Hex strings require an exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1\02p1", 7)), "Hex strings require an exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1p\0", 5)), "Invalid character in exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1p1\0", 6)), "Invalid character in exponent");
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, StringRef("0x1p1\02", 7)), "Invalid character in exponent");
|
||||
|
||||
ASSERT_DEATH(APFloat(APFloat::IEEEdouble, "0x1p0f"), "Invalid character in exponent");
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user