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Fix integer undefined behavior due to signed left shift overflow in LLVM.

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Reviewed offline by chandlerc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith
2012-08-24 23:29:28 +00:00
parent cac59d8ae8
commit 1144af3c9b
19 changed files with 59 additions and 56 deletions
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lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+3 -4
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@@ -1475,10 +1475,9 @@ static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
return Base;
// Truncate/sext the offset to the pointer size.
if (TD.getPointerSizeInBits() != 64) {
int SExtAmount = 64-TD.getPointerSizeInBits();
Offset = (Offset << SExtAmount) >> SExtAmount;
}
unsigned Width = TD.getPointerSizeInBits();
if (Width < 64)
Offset = SignExtend64(Offset, Width);
return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
Ctx);