#include "llvm/ADT/FoldingSet.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
+#include <limits.h>
#include <cstring>
using namespace llvm;
pow(5, power) is
power * 815 / (351 * integerPartWidth) + 1
-
+
However, whilst the result may require only this many parts,
because we are multiplying two values to get it, the
multiplication may require an extra part with the excess part
unsigned int r;
r = c - '0';
- if(r <= 9)
+ if (r <= 9)
return r;
r = c - 'A';
- if(r <= 5)
+ if (r <= 5)
return r + 10;
r = c - 'a';
- if(r <= 5)
+ if (r <= 5)
return r + 10;
return -1U;
static inline void
assertArithmeticOK(const llvm::fltSemantics &semantics) {
- assert(semantics.arithmeticOK
- && "Compile-time arithmetic does not support these semantics");
+ assert(semantics.arithmeticOK &&
+ "Compile-time arithmetic does not support these semantics");
}
/* Return the value of a decimal exponent of the form
assert(p != end && "Exponent has no digits");
negative = *p == '-';
- if(*p == '-' || *p == '+') {
+ if (*p == '-' || *p == '+') {
p++;
assert(p != end && "Exponent has no digits");
}
unsignedExponent = 0;
overflow = false;
- for(; p != end; ++p) {
+ for (; p != end; ++p) {
unsigned int value;
value = decDigitValue(*p);
assert(value < 10U && "Invalid character in exponent");
unsignedExponent = unsignedExponent * 10 + value;
- if(unsignedExponent > 65535)
+ if (unsignedExponent > 65535)
overflow = true;
}
- if(exponentAdjustment > 65535 || exponentAdjustment < -65536)
+ if (exponentAdjustment > 65535 || exponentAdjustment < -65536)
overflow = true;
- if(!overflow) {
+ if (!overflow) {
exponent = unsignedExponent;
- if(negative)
+ if (negative)
exponent = -exponent;
exponent += exponentAdjustment;
- if(exponent > 65535 || exponent < -65536)
+ if (exponent > 65535 || exponent < -65536)
overflow = true;
}
- if(overflow)
+ if (overflow)
exponent = negative ? -65536: 65535;
return exponent;
{
StringRef::iterator p = begin;
*dot = end;
- while(*p == '0' && p != end)
+ while (*p == '0' && p != end)
p++;
- if(*p == '.') {
+ if (*p == '.') {
*dot = p++;
assert(end - begin != 1 && "Significand has no digits");
- while(*p == '0' && p != end)
+ while (*p == '0' && p != end)
p++;
}
/* If the first trailing digit isn't 0 or 8 we can work out the
fraction immediately. */
- if(digitValue > 8)
+ if (digitValue > 8)
return lfMoreThanHalf;
- else if(digitValue < 8 && digitValue > 0)
+ else if (digitValue < 8 && digitValue > 0)
return lfLessThanHalf;
/* Otherwise we need to find the first non-zero digit. */
- while(*p == '0')
+ while (*p == '0')
p++;
assert(p != end && "Invalid trailing hexadecimal fraction!");
/* If we ran off the end it is exactly zero or one-half, otherwise
a little more. */
- if(hexDigit == -1U)
+ if (hexDigit == -1U)
return digitValue == 0 ? lfExactlyZero: lfExactlyHalf;
else
return digitValue == 0 ? lfLessThanHalf: lfMoreThanHalf;
lsb = APInt::tcLSB(parts, partCount);
/* Note this is guaranteed true if bits == 0, or LSB == -1U. */
- if(bits <= lsb)
+ if (bits <= lsb)
return lfExactlyZero;
- if(bits == lsb + 1)
+ if (bits == lsb + 1)
return lfExactlyHalf;
- if(bits <= partCount * integerPartWidth
- && APInt::tcExtractBit(parts, bits - 1))
+ if (bits <= partCount * integerPartWidth &&
+ APInt::tcExtractBit(parts, bits - 1))
return lfMoreThanHalf;
return lfLessThanHalf;
combineLostFractions(lostFraction moreSignificant,
lostFraction lessSignificant)
{
- if(lessSignificant != lfExactlyZero) {
- if(moreSignificant == lfExactlyZero)
+ if (lessSignificant != lfExactlyZero) {
+ if (moreSignificant == lfExactlyZero)
moreSignificant = lfLessThanHalf;
- else if(moreSignificant == lfExactlyHalf)
+ else if (moreSignificant == lfExactlyHalf)
moreSignificant = lfMoreThanHalf;
}
15625, 78125 };
integerPart pow5s[maxPowerOfFiveParts * 2 + 5];
pow5s[0] = 78125 * 5;
-
+
unsigned int partsCount[16] = { 1 };
integerPart scratch[maxPowerOfFiveParts], *p1, *p2, *pow5;
unsigned int result;
semantics = ourSemantics;
count = partCount();
- if(count > 1)
+ if (count > 1)
significand.parts = new integerPart[count];
}
void
APFloat::freeSignificand()
{
- if(partCount() > 1)
+ if (partCount() > 1)
delete [] significand.parts;
}
exponent = rhs.exponent;
sign2 = rhs.sign2;
exponent2 = rhs.exponent2;
- if(category == fcNormal || category == fcNaN)
+ if (category == fcNormal || category == fcNaN)
copySignificand(rhs);
}
/* Make this number a NaN, with an arbitrary but deterministic value
for the significand. If double or longer, this is a signalling NaN,
which may not be ideal. If float, this is QNaN(0). */
-void
-APFloat::makeNaN(unsigned type)
+void APFloat::makeNaN(bool SNaN, bool Negative, const APInt *fill)
{
category = fcNaN;
- // FIXME: Add double and long double support for QNaN(0).
- if (semantics->precision == 24 && semantics->maxExponent == 127) {
- type |= 0x7fc00000U;
- type &= ~0x80000000U;
- } else
- type = ~0U;
- APInt::tcSet(significandParts(), type, partCount());
+ sign = Negative;
+
+ integerPart *significand = significandParts();
+ unsigned numParts = partCount();
+
+ // Set the significand bits to the fill.
+ if (!fill || fill->getNumWords() < numParts)
+ APInt::tcSet(significand, 0, numParts);
+ if (fill) {
+ APInt::tcAssign(significand, fill->getRawData(),
+ std::min(fill->getNumWords(), numParts));
+
+ // Zero out the excess bits of the significand.
+ unsigned bitsToPreserve = semantics->precision - 1;
+ unsigned part = bitsToPreserve / 64;
+ bitsToPreserve %= 64;
+ significand[part] &= ((1ULL << bitsToPreserve) - 1);
+ for (part++; part != numParts; ++part)
+ significand[part] = 0;
+ }
+
+ unsigned QNaNBit = semantics->precision - 2;
+
+ if (SNaN) {
+ // We always have to clear the QNaN bit to make it an SNaN.
+ APInt::tcClearBit(significand, QNaNBit);
+
+ // If there are no bits set in the payload, we have to set
+ // *something* to make it a NaN instead of an infinity;
+ // conventionally, this is the next bit down from the QNaN bit.
+ if (APInt::tcIsZero(significand, numParts))
+ APInt::tcSetBit(significand, QNaNBit - 1);
+ } else {
+ // We always have to set the QNaN bit to make it a QNaN.
+ APInt::tcSetBit(significand, QNaNBit);
+ }
+
+ // For x87 extended precision, we want to make a NaN, not a
+ // pseudo-NaN. Maybe we should expose the ability to make
+ // pseudo-NaNs?
+ if (semantics == &APFloat::x87DoubleExtended)
+ APInt::tcSetBit(significand, QNaNBit + 1);
+}
+
+APFloat APFloat::makeNaN(const fltSemantics &Sem, bool SNaN, bool Negative,
+ const APInt *fill) {
+ APFloat value(Sem, uninitialized);
+ value.makeNaN(SNaN, Negative, fill);
+ return value;
}
APFloat &
APFloat::operator=(const APFloat &rhs)
{
- if(this != &rhs) {
- if(semantics != rhs.semantics) {
+ if (this != &rhs) {
+ if (semantics != rhs.semantics) {
freeSignificand();
initialize(rhs.semantics);
}
sign = false;
}
+APFloat::APFloat(const fltSemantics &ourSemantics, uninitializedTag tag) {
+ assertArithmeticOK(ourSemantics);
+ // Allocates storage if necessary but does not initialize it.
+ initialize(&ourSemantics);
+}
APFloat::APFloat(const fltSemantics &ourSemantics,
- fltCategory ourCategory, bool negative, unsigned type)
+ fltCategory ourCategory, bool negative)
{
assertArithmeticOK(ourSemantics);
initialize(&ourSemantics);
if (category == fcNormal)
category = fcZero;
else if (ourCategory == fcNaN)
- makeNaN(type);
+ makeNaN();
}
APFloat::APFloat(const fltSemantics &ourSemantics, const StringRef& text)
precision = semantics->precision;
newPartsCount = partCountForBits(precision * 2);
- if(newPartsCount > 4)
+ if (newPartsCount > 4)
fullSignificand = new integerPart[newPartsCount];
else
fullSignificand = scratch;
omsb = APInt::tcMSB(fullSignificand, newPartsCount) + 1;
exponent += rhs.exponent;
- if(addend) {
+ if (addend) {
Significand savedSignificand = significand;
const fltSemantics *savedSemantics = semantics;
fltSemantics extendedSemantics;
/* Normalize our MSB. */
extendedPrecision = precision + precision - 1;
- if(omsb != extendedPrecision)
- {
- APInt::tcShiftLeft(fullSignificand, newPartsCount,
- extendedPrecision - omsb);
- exponent -= extendedPrecision - omsb;
- }
+ if (omsb != extendedPrecision) {
+ APInt::tcShiftLeft(fullSignificand, newPartsCount,
+ extendedPrecision - omsb);
+ exponent -= extendedPrecision - omsb;
+ }
/* Create new semantics. */
extendedSemantics = *semantics;
extendedSemantics.precision = extendedPrecision;
- if(newPartsCount == 1)
+ if (newPartsCount == 1)
significand.part = fullSignificand[0];
else
significand.parts = fullSignificand;
lost_fraction = addOrSubtractSignificand(extendedAddend, false);
/* Restore our state. */
- if(newPartsCount == 1)
+ if (newPartsCount == 1)
fullSignificand[0] = significand.part;
significand = savedSignificand;
semantics = savedSemantics;
exponent -= (precision - 1);
- if(omsb > precision) {
+ if (omsb > precision) {
unsigned int bits, significantParts;
lostFraction lf;
APInt::tcAssign(lhsSignificand, fullSignificand, partsCount);
- if(newPartsCount > 4)
+ if (newPartsCount > 4)
delete [] fullSignificand;
return lost_fraction;
rhsSignificand = rhs.significandParts();
partsCount = partCount();
- if(partsCount > 2)
+ if (partsCount > 2)
dividend = new integerPart[partsCount * 2];
else
dividend = scratch;
divisor = dividend + partsCount;
/* Copy the dividend and divisor as they will be modified in-place. */
- for(i = 0; i < partsCount; i++) {
+ for (i = 0; i < partsCount; i++) {
dividend[i] = lhsSignificand[i];
divisor[i] = rhsSignificand[i];
lhsSignificand[i] = 0;
/* Normalize the divisor. */
bit = precision - APInt::tcMSB(divisor, partsCount) - 1;
- if(bit) {
+ if (bit) {
exponent += bit;
APInt::tcShiftLeft(divisor, partsCount, bit);
}
/* Normalize the dividend. */
bit = precision - APInt::tcMSB(dividend, partsCount) - 1;
- if(bit) {
+ if (bit) {
exponent -= bit;
APInt::tcShiftLeft(dividend, partsCount, bit);
}
/* Ensure the dividend >= divisor initially for the loop below.
Incidentally, this means that the division loop below is
guaranteed to set the integer bit to one. */
- if(APInt::tcCompare(dividend, divisor, partsCount) < 0) {
+ if (APInt::tcCompare(dividend, divisor, partsCount) < 0) {
exponent--;
APInt::tcShiftLeft(dividend, partsCount, 1);
assert(APInt::tcCompare(dividend, divisor, partsCount) >= 0);
}
/* Long division. */
- for(bit = precision; bit; bit -= 1) {
- if(APInt::tcCompare(dividend, divisor, partsCount) >= 0) {
+ for (bit = precision; bit; bit -= 1) {
+ if (APInt::tcCompare(dividend, divisor, partsCount) >= 0) {
APInt::tcSubtract(dividend, divisor, 0, partsCount);
APInt::tcSetBit(lhsSignificand, bit - 1);
}
/* Figure out the lost fraction. */
int cmp = APInt::tcCompare(dividend, divisor, partsCount);
- if(cmp > 0)
+ if (cmp > 0)
lost_fraction = lfMoreThanHalf;
- else if(cmp == 0)
+ else if (cmp == 0)
lost_fraction = lfExactlyHalf;
- else if(APInt::tcIsZero(dividend, partsCount))
+ else if (APInt::tcIsZero(dividend, partsCount))
lost_fraction = lfExactlyZero;
else
lost_fraction = lfLessThanHalf;
- if(partsCount > 2)
+ if (partsCount > 2)
delete [] dividend;
return lost_fraction;
{
assert(bits < semantics->precision);
- if(bits) {
+ if (bits) {
unsigned int partsCount = partCount();
APInt::tcShiftLeft(significandParts(), partsCount, bits);
/* If exponents are equal, do an unsigned bignum comparison of the
significands. */
- if(compare == 0)
+ if (compare == 0)
compare = APInt::tcCompare(significandParts(), rhs.significandParts(),
partCount());
- if(compare > 0)
+ if (compare > 0)
return cmpGreaterThan;
- else if(compare < 0)
+ else if (compare < 0)
return cmpLessThan;
else
return cmpEqual;
APFloat::handleOverflow(roundingMode rounding_mode)
{
/* Infinity? */
- if(rounding_mode == rmNearestTiesToEven
- || rounding_mode == rmNearestTiesToAway
- || (rounding_mode == rmTowardPositive && !sign)
- || (rounding_mode == rmTowardNegative && sign))
- {
- category = fcInfinity;
- return (opStatus) (opOverflow | opInexact);
- }
+ if (rounding_mode == rmNearestTiesToEven ||
+ rounding_mode == rmNearestTiesToAway ||
+ (rounding_mode == rmTowardPositive && !sign) ||
+ (rounding_mode == rmTowardNegative && sign)) {
+ category = fcInfinity;
+ return (opStatus) (opOverflow | opInexact);
+ }
/* Otherwise we become the largest finite number. */
category = fcNormal;
return lost_fraction == lfExactlyHalf || lost_fraction == lfMoreThanHalf;
case rmNearestTiesToEven:
- if(lost_fraction == lfMoreThanHalf)
+ if (lost_fraction == lfMoreThanHalf)
return true;
/* Our zeroes don't have a significand to test. */
- if(lost_fraction == lfExactlyHalf && category != fcZero)
+ if (lost_fraction == lfExactlyHalf && category != fcZero)
return APInt::tcExtractBit(significandParts(), bit);
return false;
unsigned int omsb; /* One, not zero, based MSB. */
int exponentChange;
- if(category != fcNormal)
+ if (category != fcNormal)
return opOK;
/* Before rounding normalize the exponent of fcNormal numbers. */
omsb = significandMSB() + 1;
- if(omsb) {
+ if (omsb) {
/* OMSB is numbered from 1. We want to place it in the integer
bit numbered PRECISON if possible, with a compensating change in
the exponent. */
/* If the resulting exponent is too high, overflow according to
the rounding mode. */
- if(exponent + exponentChange > semantics->maxExponent)
+ if (exponent + exponentChange > semantics->maxExponent)
return handleOverflow(rounding_mode);
/* Subnormal numbers have exponent minExponent, and their MSB
is forced based on that. */
- if(exponent + exponentChange < semantics->minExponent)
+ if (exponent + exponentChange < semantics->minExponent)
exponentChange = semantics->minExponent - exponent;
/* Shifting left is easy as we don't lose precision. */
- if(exponentChange < 0) {
+ if (exponentChange < 0) {
assert(lost_fraction == lfExactlyZero);
shiftSignificandLeft(-exponentChange);
return opOK;
}
- if(exponentChange > 0) {
+ if (exponentChange > 0) {
lostFraction lf;
/* Shift right and capture any new lost fraction. */
lost_fraction = combineLostFractions(lf, lost_fraction);
/* Keep OMSB up-to-date. */
- if(omsb > (unsigned) exponentChange)
+ if (omsb > (unsigned) exponentChange)
omsb -= exponentChange;
else
omsb = 0;
/* As specified in IEEE 754, since we do not trap we do not report
underflow for exact results. */
- if(lost_fraction == lfExactlyZero) {
+ if (lost_fraction == lfExactlyZero) {
/* Canonicalize zeroes. */
- if(omsb == 0)
+ if (omsb == 0)
category = fcZero;
return opOK;
}
/* Increment the significand if we're rounding away from zero. */
- if(roundAwayFromZero(rounding_mode, lost_fraction, 0)) {
- if(omsb == 0)
+ if (roundAwayFromZero(rounding_mode, lost_fraction, 0)) {
+ if (omsb == 0)
exponent = semantics->minExponent;
incrementSignificand();
omsb = significandMSB() + 1;
/* Did the significand increment overflow? */
- if(omsb == (unsigned) semantics->precision + 1) {
+ if (omsb == (unsigned) semantics->precision + 1) {
/* Renormalize by incrementing the exponent and shifting our
significand right one. However if we already have the
maximum exponent we overflow to infinity. */
- if(exponent == semantics->maxExponent) {
+ if (exponent == semantics->maxExponent) {
category = fcInfinity;
return (opStatus) (opOverflow | opInexact);
/* The normal case - we were and are not denormal, and any
significand increment above didn't overflow. */
- if(omsb == semantics->precision)
+ if (omsb == semantics->precision)
return opInexact;
/* We have a non-zero denormal. */
assert(omsb < semantics->precision);
/* Canonicalize zeroes. */
- if(omsb == 0)
+ if (omsb == 0)
category = fcZero;
/* The fcZero case is a denormal that underflowed to zero. */
case convolve(fcInfinity, fcInfinity):
/* Differently signed infinities can only be validly
subtracted. */
- if(((sign ^ rhs.sign)!=0) != subtract) {
+ if (((sign ^ rhs.sign)!=0) != subtract) {
makeNaN();
return opInvalidOp;
}
bits = exponent - rhs.exponent;
/* Subtraction is more subtle than one might naively expect. */
- if(subtract) {
+ if (subtract) {
APFloat temp_rhs(rhs);
bool reverse;
/* Invert the lost fraction - it was on the RHS and
subtracted. */
- if(lost_fraction == lfLessThanHalf)
+ if (lost_fraction == lfLessThanHalf)
lost_fraction = lfMoreThanHalf;
- else if(lost_fraction == lfMoreThanHalf)
+ else if (lost_fraction == lfMoreThanHalf)
lost_fraction = lfLessThanHalf;
/* The code above is intended to ensure that no borrow is
necessary. */
assert(!carry);
} else {
- if(bits > 0) {
+ if (bits > 0) {
APFloat temp_rhs(rhs);
lost_fraction = temp_rhs.shiftSignificandRight(bits);
fs = addOrSubtractSpecials(rhs, subtract);
/* This return code means it was not a simple case. */
- if(fs == opDivByZero) {
+ if (fs == opDivByZero) {
lostFraction lost_fraction;
lost_fraction = addOrSubtractSignificand(rhs, subtract);
/* If two numbers add (exactly) to zero, IEEE 754 decrees it is a
positive zero unless rounding to minus infinity, except that
adding two like-signed zeroes gives that zero. */
- if(category == fcZero) {
- if(rhs.category != fcZero || (sign == rhs.sign) == subtract)
+ if (category == fcZero) {
+ if (rhs.category != fcZero || (sign == rhs.sign) == subtract)
sign = (rounding_mode == rmTowardNegative);
}
sign ^= rhs.sign;
fs = multiplySpecials(rhs);
- if(category == fcNormal) {
+ if (category == fcNormal) {
lostFraction lost_fraction = multiplySignificand(rhs, 0);
fs = normalize(rounding_mode, lost_fraction);
- if(lost_fraction != lfExactlyZero)
+ if (lost_fraction != lfExactlyZero)
fs = (opStatus) (fs | opInexact);
}
sign ^= rhs.sign;
fs = divideSpecials(rhs);
- if(category == fcNormal) {
+ if (category == fcNormal) {
lostFraction lost_fraction = divideSignificand(rhs);
fs = normalize(rounding_mode, lost_fraction);
- if(lost_fraction != lfExactlyZero)
+ if (lost_fraction != lfExactlyZero)
fs = (opStatus) (fs | opInexact);
}
return fs;
}
-/* Normalized llvm frem (C fmod).
+/* Normalized llvm frem (C fmod).
This is not currently correct in all cases. */
APFloat::opStatus
APFloat::mod(const APFloat &rhs, roundingMode rounding_mode)
/* If and only if all arguments are normal do we need to do an
extended-precision calculation. */
- if(category == fcNormal
- && multiplicand.category == fcNormal
- && addend.category == fcNormal) {
+ if (category == fcNormal &&
+ multiplicand.category == fcNormal &&
+ addend.category == fcNormal) {
lostFraction lost_fraction;
lost_fraction = multiplySignificand(multiplicand, &addend);
fs = normalize(rounding_mode, lost_fraction);
- if(lost_fraction != lfExactlyZero)
+ if (lost_fraction != lfExactlyZero)
fs = (opStatus) (fs | opInexact);
/* If two numbers add (exactly) to zero, IEEE 754 decrees it is a
positive zero unless rounding to minus infinity, except that
adding two like-signed zeroes gives that zero. */
- if(category == fcZero && sign != addend.sign)
+ if (category == fcZero && sign != addend.sign)
sign = (rounding_mode == rmTowardNegative);
} else {
fs = multiplySpecials(multiplicand);
If we need to do the addition we can do so with normal
precision. */
- if(fs == opOK)
+ if (fs == opOK)
fs = addOrSubtract(addend, rounding_mode, false);
}
case convolve(fcInfinity, fcNormal):
case convolve(fcInfinity, fcZero):
case convolve(fcNormal, fcZero):
- if(sign)
+ if (sign)
return cmpLessThan;
else
return cmpGreaterThan;
case convolve(fcNormal, fcInfinity):
case convolve(fcZero, fcInfinity):
case convolve(fcZero, fcNormal):
- if(rhs.sign)
+ if (rhs.sign)
return cmpGreaterThan;
else
return cmpLessThan;
case convolve(fcInfinity, fcInfinity):
- if(sign == rhs.sign)
+ if (sign == rhs.sign)
return cmpEqual;
- else if(sign)
+ else if (sign)
return cmpLessThan;
else
return cmpGreaterThan;
}
/* Two normal numbers. Do they have the same sign? */
- if(sign != rhs.sign) {
- if(sign)
+ if (sign != rhs.sign) {
+ if (sign)
result = cmpLessThan;
else
result = cmpGreaterThan;
/* Compare absolute values; invert result if negative. */
result = compareAbsoluteValue(rhs);
- if(sign) {
- if(result == cmpLessThan)
+ if (sign) {
+ if (result == cmpLessThan)
result = cmpGreaterThan;
- else if(result == cmpGreaterThan)
+ else if (result == cmpGreaterThan)
result = cmpLessThan;
}
}
}
}
- if(category == fcNormal) {
+ if (category == fcNormal) {
/* Re-interpret our bit-pattern. */
exponent += toSemantics.precision - semantics->precision;
semantics = &toSemantics;
// x87 long double).
if (APInt::tcLSB(significandParts(), newPartCount) < ushift)
*losesInfo = true;
- if (oldSemantics == &APFloat::x87DoubleExtended &&
+ if (oldSemantics == &APFloat::x87DoubleExtended &&
(!(*significandParts() & 0x8000000000000000ULL) ||
!(*significandParts() & 0x4000000000000000ULL)))
*losesInfo = true;
*isExact = false;
/* Handle the three special cases first. */
- if(category == fcInfinity || category == fcNaN)
+ if (category == fcInfinity || category == fcNaN)
return opInvalidOp;
dstPartsCount = partCountForBits(width);
- if(category == fcZero) {
+ if (category == fcZero) {
APInt::tcSet(parts, 0, dstPartsCount);
// Negative zero can't be represented as an int.
*isExact = !sign;
if (truncatedBits) {
lost_fraction = lostFractionThroughTruncation(src, partCount(),
truncatedBits);
- if (lost_fraction != lfExactlyZero
- && roundAwayFromZero(rounding_mode, lost_fraction, truncatedBits)) {
+ if (lost_fraction != lfExactlyZero &&
+ roundAwayFromZero(rounding_mode, lost_fraction, truncatedBits)) {
if (APInt::tcIncrement(parts, dstPartsCount))
return opInvalidOp; /* Overflow. */
}
{
opStatus fs;
- fs = convertToSignExtendedInteger(parts, width, isSigned, rounding_mode,
+ fs = convertToSignExtendedInteger(parts, width, isSigned, rounding_mode,
isExact);
if (fs == opInvalidOp) {
opStatus status;
assertArithmeticOK(*semantics);
- if (isSigned
- && APInt::tcExtractBit(src, srcCount * integerPartWidth - 1)) {
+ if (isSigned &&
+ APInt::tcExtractBit(src, srcCount * integerPartWidth - 1)) {
integerPart *copy;
/* If we're signed and negative negate a copy. */
APInt api = APInt(width, partCount, parts);
sign = false;
- if(isSigned && APInt::tcExtractBit(parts, width - 1)) {
+ if (isSigned && APInt::tcExtractBit(parts, width - 1)) {
sign = true;
api = -api;
}
StringRef::iterator p = skipLeadingZeroesAndAnyDot(begin, end, &dot);
firstSignificantDigit = p;
- for(; p != end;) {
+ for (; p != end;) {
integerPart hex_value;
- if(*p == '.') {
+ if (*p == '.') {
assert(dot == end && "String contains multiple dots");
dot = p++;
if (p == end) {
}
hex_value = hexDigitValue(*p);
- if(hex_value == -1U) {
+ if (hex_value == -1U) {
break;
}
break;
} else {
/* Store the number whilst 4-bit nibbles remain. */
- if(bitPos) {
+ if (bitPos) {
bitPos -= 4;
hex_value <<= bitPos % integerPartWidth;
significand[bitPos / integerPartWidth] |= hex_value;
} else {
lost_fraction = trailingHexadecimalFraction(p, end, hex_value);
- while(p != end && hexDigitValue(*p) != -1U)
+ while (p != end && hexDigitValue(*p) != -1U)
p++;
break;
}
assert((dot == end || p - begin != 1) && "Significand has no digits");
/* Ignore the exponent if we are zero. */
- if(p != firstSignificantDigit) {
+ if (p != firstSignificantDigit) {
int expAdjustment;
/* Implicit hexadecimal point? */
/* Calculate the exponent adjustment implicit in the number of
significant digits. */
expAdjustment = static_cast<int>(dot - firstSignificantDigit);
- if(expAdjustment < 0)
+ if (expAdjustment < 0)
expAdjustment++;
expAdjustment = expAdjustment * 4 - 1;
integerPart pow5Parts[maxPowerOfFiveParts];
bool isNearest;
- isNearest = (rounding_mode == rmNearestTiesToEven
- || rounding_mode == rmNearestTiesToAway);
+ isNearest = (rounding_mode == rmNearestTiesToEven ||
+ rounding_mode == rmNearestTiesToAway);
parts = partCountForBits(semantics->precision + 11);
if (decDigitValue(*D.firstSigDigit) >= 10U) {
category = fcZero;
fs = opOK;
- } else if ((D.normalizedExponent + 1) * 28738
- <= 8651 * (semantics->minExponent - (int) semantics->precision)) {
+
+ /* Check whether the normalized exponent is high enough to overflow
+ max during the log-rebasing in the max-exponent check below. */
+ } else if (D.normalizedExponent - 1 > INT_MAX / 42039) {
+ fs = handleOverflow(rounding_mode);
+
+ /* If it wasn't, then it also wasn't high enough to overflow max
+ during the log-rebasing in the min-exponent check. Check that it
+ won't overflow min in either check, then perform the min-exponent
+ check. */
+ } else if (D.normalizedExponent - 1 < INT_MIN / 42039 ||
+ (D.normalizedExponent + 1) * 28738 <=
+ 8651 * (semantics->minExponent - (int) semantics->precision)) {
/* Underflow to zero and round. */
zeroSignificand();
fs = normalize(rounding_mode, lfLessThanHalf);
+
+ /* We can finally safely perform the max-exponent check. */
} else if ((D.normalizedExponent - 1) * 42039
>= 12655 * semantics->maxExponent) {
/* Overflow and round. */
StringRef::iterator p = str.begin();
size_t slen = str.size();
sign = *p == '-' ? 1 : 0;
- if(*p == '-' || *p == '+') {
+ if (*p == '-' || *p == '+') {
p++;
slen--;
assert(slen && "String has no digits");
}
- if(slen >= 2 && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
+ if (slen >= 2 && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
assert(slen - 2 && "Invalid string");
return convertFromHexadecimalString(StringRef(p + 2, slen - 2),
rounding_mode);
// exponent2 and significand2 are required to be 0; we don't check
category = fcInfinity;
} else if (myexponent==0x7ff && mysignificand!=0) {
- // exponent meaningless. So is the whole second word, but keep it
+ // exponent meaningless. So is the whole second word, but keep it
// for determinism.
category = fcNaN;
exponent2 = myexponent2;
exponent = -1022;
else
significandParts()[0] |= 0x10000000000000LL; // integer bit
- if (myexponent2==0)
+ if (myexponent2==0)
exponent2 = -1022;
else
significandParts()[1] |= 0x10000000000000LL; // integer bit
significand[i] = ~((integerPart) 0);
// ...and then clear the top bits for internal consistency.
- significand[N-1]
- &= (((integerPart) 1) << ((Sem.precision % integerPartWidth) - 1)) - 1;
+ significand[N-1] &=
+ (((integerPart) 1) << ((Sem.precision % integerPartWidth) - 1)) - 1;
return Val;
}
Val.exponent = Sem.minExponent;
Val.zeroSignificand();
- Val.significandParts()[partCountForBits(Sem.precision)-1]
- |= (((integerPart) 1) << ((Sem.precision % integerPartWidth) - 1));
+ Val.significandParts()[partCountForBits(Sem.precision)-1] |=
+ (((integerPart) 1) << ((Sem.precision % integerPartWidth) - 1));
return Val;
}
void APFloat::toString(SmallVectorImpl<char> &Str,
unsigned FormatPrecision,
- unsigned FormatMaxPadding) {
+ unsigned FormatMaxPadding) const {
switch (category) {
case fcInfinity:
if (isNegative())
// log2(N * 5^e) == log2(N) + e * log2(5)
// <= semantics->precision + e * 137 / 59
// (log_2(5) ~ 2.321928 < 2.322034 ~ 137/59)
-
+
unsigned precision = semantics->precision + 137 * texp / 59;
// Multiply significand by 5^e.
APInt five_to_the_i(precision, 5);
while (true) {
if (texp & 1) significand *= five_to_the_i;
-
+
texp >>= 1;
if (!texp) break;
five_to_the_i *= five_to_the_i;
projects / oota-llvm.git / blobdiff