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Make sure constant subscript is truncated to ptr size if it may not fit.

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llvm-svn: 64163
This commit is contained in:
Evan Cheng 2009-02-09 20:54:38 +00:00
parent f47945d757
commit 44e58653af
2 changed files with 18 additions and 1 deletions
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9
lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
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@ -2699,8 +2699,15 @@ void SelectionDAGLowering::visitGetElementPtr(User &I) {
if (CI->getZExtValue() == 0) continue;
uint64_t Offs =
TD->getTypePaddedSize(Ty)*cast<ConstantInt>(CI)->getSExtValue();
SDValue OffsVal = DAG.getConstant(Offs, MVT::i64);
unsigned PtrBits = TLI.getPointerTy().getSizeInBits();
if (PtrBits < 64)
OffsVal = DAG.getNode(ISD::TRUNCATE, getCurDebugLoc(),
TLI.getPointerTy(), OffsVal);
else
OffsVal = DAG.getIntPtrConstant(Offs);
N = DAG.getNode(ISD::ADD, getCurDebugLoc(), N.getValueType(), N,
DAG.getIntPtrConstant(Offs));
OffsVal);
continue;
}

10
test/CodeGen/X86/negative-subscript.ll Normal file
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@ -0,0 +1,10 @@
; RUN: llvm-as < %s | llc -march=x86
; rdar://6559995
@a = external global [255 x i8*], align 32
define i32 @main() nounwind {
entry:
store i8* bitcast (i8** getelementptr ([255 x i8*]* @a, i32 0, i32 -2147483624) to i8*), i8** getelementptr ([255 x i8*]* @a, i32 0, i32 16), align 32
ret i32 0
}