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fix a bug I introduced with my 'instcombine builder' refactoring 

changes: SimplifyDemandedBits can't use the builder yet because it
has the wrong insertion point.  This fixes a crash building
MultiSource/Benchmarks/PAQ8p

llvm-svn: 80537
This commit is contained in:
Chris Lattner 2009-08-31 04:36:22 +00:00
parent 2f2110affa
commit 4e3e930743
2 changed files with 20 additions and 2 deletions
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8
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -1010,8 +1010,12 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
// If all of the demanded bits are known to be zero on one side or the
// other, turn this into an *inclusive* or.
// e.g. (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
if ((DemandedMask & ~RHSKnownZero & ~LHSKnownZero) == 0)
return Builder->CreateOr(I->getOperand(0), I->getOperand(1),I->getName());
if ((DemandedMask & ~RHSKnownZero & ~LHSKnownZero) == 0) {
Instruction *Or =
BinaryOperator::CreateOr(I->getOperand(0), I->getOperand(1),
I->getName());
return InsertNewInstBefore(Or, *I);
}
// If all of the demanded bits on one side are known, and all of the set
// bits on that side are also known to be set on the other side, turn this

14
llvm/test/Transforms/InstCombine/crash.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin10.0"
define i32 @_Z9model8bitR5Mixeri(i8 %tmp2) ssp {
entry:
%tmp3 = zext i8 %tmp2 to i32
%tmp8 = lshr i32 %tmp3, 6
%tmp9 = lshr i32 %tmp3, 7
%tmp10 = xor i32 %tmp9, 67108858
%tmp11 = xor i32 %tmp10, %tmp8
%tmp12 = xor i32 %tmp11, 0
ret i32 %tmp12
}