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Add attempted idiotproofing comment per review.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78825 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -885,7 +885,7 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
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return isNeg ? -Tmp : Tmp;
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}
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/// RoundToDouble - This function convert this APInt to a double.
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/// RoundToDouble - This function converts this APInt to a double.
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/// The layout for double is as following (IEEE Standard 754):
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/// --------------------------------------
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/// | Sign Exponent Fraction Bias |
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@ -895,6 +895,7 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
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double APInt::roundToDouble(bool isSigned) const {
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// Handle the simple case where the value is contained in one uint64_t.
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// It is wrong to optimize getWord(0) to VAL; there might be more than one word.
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if (isSingleWord() || getActiveBits() <= APINT_BITS_PER_WORD) {
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if (isSigned) {
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int64_t sext = (int64_t(getWord(0)) << (64-BitWidth)) >> (64-BitWidth);
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