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Don't try to create a mask when we don't need one. Fixes a crash.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58075 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -368,10 +368,12 @@ Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
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if (TD && CE->getOpcode() == Instruction::IntToPtr) {
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Constant *Input = CE->getOperand(0);
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unsigned InWidth = Input->getType()->getPrimitiveSizeInBits();
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if (TD->getPointerSizeInBits() < InWidth) {
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Constant *Mask =
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ConstantInt::get(APInt::getLowBitsSet(InWidth,
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TD->getPointerSizeInBits()));
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Input = ConstantExpr::getAnd(Input, Mask);
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}
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// Do a zext or trunc to get to the dest size.
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return ConstantExpr::getIntegerCast(Input, DestTy, false);
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}
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@ -0,0 +1,8 @@
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; RUN: llvm-as < %s | opt -instcombine
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; PR2940
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define i32 @tstid() {
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%var0 = inttoptr i32 1 to i8* ; <i8*> [#uses=1]
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%var2 = ptrtoint i8* %var0 to i32 ; <i32> [#uses=1]
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ret i32 %var2
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}
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