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Fix undefined behavior (left shift of negative value) in SystemZ backend.

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This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216131 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2014-08-20 21:56:43 +00:00
parent dac67649f2
commit d1e3fcf347
2 changed files with 3 additions and 7 deletions
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2
lib/Target/SystemZ/SystemZFrameLowering.cpp
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@@ -294,7 +294,7 @@ static void emitIncrement(MachineBasicBlock &MBB,
else {
Opcode = SystemZ::AGFI;
// Make sure we maintain 8-byte stack alignment.
int64_t MinVal = -int64_t(1) << 31;
int64_t MinVal = -uint64_t(1) << 31;
int64_t MaxVal = (int64_t(1) << 31) - 8;
if (ThisVal < MinVal)
ThisVal = MinVal;