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Be careful with operand promotion. For a binary operation, the source operands may be the same. PR7018. rdar://7939869.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103419 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-05-10 19:03:57 +00:00
parent 1deea21e35
commit aad753bbbd
2 changed files with 21 additions and 4 deletions
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14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -760,12 +760,18 @@ SDValue DAGCombiner::PromoteIntBinOp(SDValue Op) {
bool Replace1 = false;
SDValue N1 = Op.getOperand(1);
SDValue NN1 = PromoteOperand(N1, PVT, Replace1);
if (NN1.getNode() == 0)
return SDValue();
SDValue NN1;
if (N0 == N1)
NN1 = NN0;
else {
NN1 = PromoteOperand(N1, PVT, Replace1);
if (NN1.getNode() == 0)
return SDValue();
}
AddToWorkList(NN0.getNode());
AddToWorkList(NN1.getNode());
if (NN1.getNode())
AddToWorkList(NN1.getNode());
if (Replace0)
ReplaceLoadWithPromotedLoad(N0.getNode(), NN0.getNode());

11
test/CodeGen/X86/2010-05-10-DAGCombinerBug.ll Normal file
View File

@ -0,0 +1,11 @@
; RUN: llc < %s -mtriple=i386-apple-darwin10
; PR7018
; rdar://7939869
define i32 @CXB30130(i32 %num1, i16* nocapture %num2, float* nocapture %num3, double* nocapture %num4) nounwind ssp {
entry:
%0 = load i16* %num2, align 2 ; <i16> [#uses=2]
%1 = mul nsw i16 %0, %0 ; <i16> [#uses=1]
store i16 %1, i16* %num2, align 2
ret i32 undef
}