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Constant integer vectors may also be negated.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2008-05-23 04:54:45 +00:00
parent 7d26bd8e97
commit 18b3da6c34
2 changed files with 13 additions and 0 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -550,6 +550,11 @@ static inline Value *dyn_castNegVal(Value *V) {
// Constants can be considered to be negated values if they can be folded.
if (ConstantInt *C = dyn_cast<ConstantInt>(V))
return ConstantExpr::getNeg(C);
if (ConstantVector *C = dyn_cast<ConstantVector>(V))
if (C->getType()->getElementType()->isInteger())
return ConstantExpr::getNeg(C);
return 0;
}

8
test/Transforms/InstCombine/2008-05-22-NegValVector.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep sub
define <3 x i8> @f(<3 x i8> %a) {
%A = sub <3 x i8> zeroinitializer, %a
%B = mul <3 x i8> %A, <i8 5, i8 5, i8 5>
ret <3 x i8> %B
}