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Add attempted idiotproofing comment per review. 

llvm-svn: 78825
This commit is contained in:
Dale Johannesen 2009-08-12 18:04:11 +00:00
parent 91f5ff6bce
commit 54be785be7
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/Support/APInt.cpp
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@ -885,7 +885,7 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
return isNeg ? -Tmp : Tmp;
}
/// RoundToDouble - This function convert this APInt to a double.
/// RoundToDouble - This function converts this APInt to a double.
/// The layout for double is as following (IEEE Standard 754):
/// --------------------------------------
/// | Sign Exponent Fraction Bias |
@ -895,6 +895,7 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
double APInt::roundToDouble(bool isSigned) const {
// Handle the simple case where the value is contained in one uint64_t.
// It is wrong to optimize getWord(0) to VAL; there might be more than one word.
if (isSingleWord() || getActiveBits() <= APINT_BITS_PER_WORD) {
if (isSigned) {
int64_t sext = (int64_t(getWord(0)) << (64-BitWidth)) >> (64-BitWidth);