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Don't try to create a mask when we don't need one. Fixes a crash.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58075 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2008-10-24 06:14:27 +00:00
parent 2efe3fd79a
commit 04aa2c3520
2 changed files with 14 additions and 4 deletions
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10
lib/Analysis/ConstantFolding.cpp
View File

@ -368,10 +368,12 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
if (TD && CE->getOpcode() == Instruction::IntToPtr) {
Constant *Input = CE->getOperand(0);
unsigned InWidth = Input->getType()->getPrimitiveSizeInBits();
Constant *Mask =
ConstantInt::get(APInt::getLowBitsSet(InWidth,
TD->getPointerSizeInBits()));
Input = ConstantExpr::getAnd(Input, Mask);
if (TD->getPointerSizeInBits() < InWidth) {
Constant *Mask =
ConstantInt::get(APInt::getLowBitsSet(InWidth,
TD->getPointerSizeInBits()));
Input = ConstantExpr::getAnd(Input, Mask);
}
// Do a zext or trunc to get to the dest size.
return ConstantExpr::getIntegerCast(Input, DestTy, false);
}

8
test/Transforms/InstCombine/2008-10-23-ConstFoldWithoutMask.ll Normal file
View File

@ -0,0 +1,8 @@
; RUN: llvm-as < %s | opt -instcombine
; PR2940
define i32 @tstid() {
%var0 = inttoptr i32 1 to i8* ; <i8*> [#uses=1]
%var2 = ptrtoint i8* %var0 to i32 ; <i32> [#uses=1]
ret i32 %var2
}