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As comments said, for negative value, the arithmetic

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over-shift-right should return -1. So here it should be signed-extended,
when bitwidth larger than 64.

test case: llvm/test/ExecutionEngine/2008-06-05-APInt-OverAShr.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51999 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zhou Sheng 2008-06-05 13:27:38 +00:00
parent ef7d2bb8d3
commit bfde7d6b9e
1 changed files with 1 additions and 1 deletions
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2
lib/Support/APInt.cpp
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@ -1113,7 +1113,7 @@ APInt APInt::ashr(uint32_t shiftAmt) const {
// issues in the algorithm below.
if (shiftAmt == BitWidth) {
if (isNegative())
return APInt(BitWidth, -1ULL);
return APInt(BitWidth, -1ULL, true);
else
return APInt(BitWidth, 0);
}