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Tweak RoundAwayFromZero the bit number below which is truncated, and make

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it const.

Preparation for APFloat -> hexadecimal string conversion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42576 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Neil Booth 2007-10-03 15:16:41 +00:00
parent 0abe116022
commit b7dea4cb36
2 changed files with 14 additions and 9 deletions
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2
include/llvm/ADT/APFloat.h
View File

@ -253,7 +253,7 @@ namespace llvm {
opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
cmpResult compareAbsoluteValue(const APFloat &) const;
opStatus handleOverflow(roundingMode);
bool roundAwayFromZero(roundingMode, lostFraction);
bool roundAwayFromZero(roundingMode, lostFraction, unsigned int) const;
opStatus convertFromUnsignedInteger(integerPart *, unsigned int,
roundingMode);
lostFraction combineLostFractions(lostFraction, lostFraction);

21
lib/Support/APFloat.cpp
View File

@ -184,7 +184,8 @@ namespace {
return digitValue == 0 ? lfLessThanHalf: lfMoreThanHalf;
}
/* Return the fraction lost were a bignum truncated. */
/* Return the fraction lost were a bignum truncated losing the least
significant BITS bits. */
lostFraction
lostFractionThroughTruncation(integerPart *parts,
unsigned int partCount,
@ -694,16 +695,20 @@ APFloat::handleOverflow(roundingMode rounding_mode)
return opInexact;
}
/* This routine must work for fcZero of both signs, and fcNormal
numbers. */
/* Returns TRUE if, when truncating the current number, with BIT the
new LSB, with the given lost fraction and rounding mode, the result
would need to be rounded away from zero (i.e., by increasing the
signficand). This routine must work for fcZero of both signs, and
fcNormal numbers. */
bool
APFloat::roundAwayFromZero(roundingMode rounding_mode,
lostFraction lost_fraction)
lostFraction lost_fraction,
unsigned int bit) const
{
/* NaNs and infinities should not have lost fractions. */
assert(category == fcNormal || category == fcZero);
/* Our caller has already handled this case. */
/* Current callers never pass this so we don't handle it. */
assert(lost_fraction != lfExactlyZero);
switch(rounding_mode) {
@ -719,7 +724,7 @@ APFloat::roundAwayFromZero(roundingMode rounding_mode,
/* Our zeroes don't have a significand to test. */
if(lost_fraction == lfExactlyHalf && category != fcZero)
return significandParts()[0] & 1;
return APInt::tcExtractBit(significandParts(), bit);
return false;
@ -802,7 +807,7 @@ APFloat::normalize(roundingMode rounding_mode,
}
/* Increment the significand if we're rounding away from zero. */
if(roundAwayFromZero(rounding_mode, lost_fraction)) {
if(roundAwayFromZero(rounding_mode, lost_fraction, 0)) {
if(omsb == 0)
exponent = semantics->minExponent;
@ -1451,7 +1456,7 @@ APFloat::convertToInteger(integerPart *parts, unsigned int width,
}
if(lost_fraction != lfExactlyZero
&& tmp.roundAwayFromZero(rounding_mode, lost_fraction))
&& tmp.roundAwayFromZero(rounding_mode, lost_fraction, 0))
tmp.incrementSignificand();
msb = tmp.significandMSB();