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[APFloat] Move setting fcNormal in zeroSignificand() to calling code. 

Zeroing the significand of a floating point number does not necessarily cause a
floating point number to become finite non zero. For instance, if one has a NaN,
zeroing the significand will cause it to become +/- infinity.

llvm-svn: 187313
This commit is contained in:
Michael Gottesman 2013-07-27 21:49:21 +00:00
parent aae69c0a1d
commit 30a90eb1a5
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Support/APFloat.cpp
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@ -778,6 +778,7 @@ APFloat::bitwiseIsEqual(const APFloat &rhs) const {
APFloat::APFloat(const fltSemantics &ourSemantics, integerPart value) {
initialize(&ourSemantics);
sign = 0;
category = fcNormal;
zeroSignificand();
exponent = ourSemantics.precision - 1;
significandParts()[0] = value;
@ -845,7 +846,6 @@ APFloat::significandParts()
void
APFloat::zeroSignificand()
{
category = fcNormal;
APInt::tcSet(significandParts(), 0, partCount());
}
@ -2301,9 +2301,9 @@ APFloat::convertFromHexadecimalString(StringRef s, roundingMode rounding_mode)
{
lostFraction lost_fraction = lfExactlyZero;
category = fcNormal;
zeroSignificand();
exponent = 0;
category = fcNormal;
integerPart *significand = significandParts();
unsigned partsCount = partCount();
@ -2512,6 +2512,7 @@ APFloat::convertFromDecimalString(StringRef str, roundingMode rounding_mode)
(D.normalizedExponent + 1) * 28738 <=
8651 * (semantics->minExponent - (int) semantics->precision)) {
/* Underflow to zero and round. */
category = fcNormal;
zeroSignificand();
fs = normalize(rounding_mode, lfLessThanHalf);
@ -3398,6 +3399,7 @@ APFloat APFloat::getSmallestNormalized(const fltSemantics &Sem, bool Negative) {
// exponent = 0..0
// significand = 10..0
Val.category = fcNormal;
Val.zeroSignificand();
Val.sign = Negative;
Val.exponent = Sem.minExponent;