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Only access both operands of an INSERT_SUBVECTOR if it is an INSERT_SUBVECTOR.

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Fixes PR10527.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136853 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-08-04 00:32:58 +00:00
parent 7ce057983e
commit 456a925c61
2 changed files with 33 additions and 9 deletions
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19
lib/Target/X86/X86ISelLowering.cpp
View File

@ -12298,16 +12298,17 @@ static bool CanFoldXORWithAllOnes(const SDNode *N) {
// Sometimes the operand may come from a insert_subvector building a 256-bit
// allones vector
SDValue V1 = N->getOperand(0);
SDValue V2 = N->getOperand(1);
if (VT.getSizeInBits() == 256 &&
N->getOpcode() == ISD::INSERT_SUBVECTOR &&
V1.getOpcode() == ISD::INSERT_SUBVECTOR &&
V1.getOperand(0).getOpcode() == ISD::UNDEF &&
ISD::isBuildVectorAllOnes(V1.getOperand(1).getNode()) &&
ISD::isBuildVectorAllOnes(V2.getNode()))
return true;
N->getOpcode() == ISD::INSERT_SUBVECTOR) {
SDValue V1 = N->getOperand(0);
SDValue V2 = N->getOperand(1);
if (V1.getOpcode() == ISD::INSERT_SUBVECTOR &&
V1.getOperand(0).getOpcode() == ISD::UNDEF &&
ISD::isBuildVectorAllOnes(V1.getOperand(1).getNode()) &&
ISD::isBuildVectorAllOnes(V2.getNode()))
return true;
}
return false;
}

23
test/CodeGen/X86/crash.ll
View File

@ -341,3 +341,26 @@ CF77:
br label %CF77
}
; PR10527
define void @pr10527() nounwind uwtable {
entry:
br label %"4"
"3":
%0 = load <2 x i32>* null, align 8
%1 = xor <2 x i32> zeroinitializer, %0
%2 = and <2 x i32> %1, %6
%3 = or <2 x i32> undef, %2
%4 = and <2 x i32> %3, undef
store <2 x i32> %4, <2 x i32>* undef
%5 = load <2 x i32>* undef, align 1
br label %"4"
"4":
%6 = phi <2 x i32> [ %5, %"3" ], [ zeroinitializer, %entry ]
%7 = icmp ult i32 undef, undef
br i1 %7, label %"3", label %"5"
"5":
ret void
}