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InstCombine: Don't try to use aggregate elements of ConstantExprs.

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PR18600.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200028 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2014-01-24 19:02:37 +00:00
parent a9699d475f
commit d7053be532
2 changed files with 15 additions and 5 deletions
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6
lib/Transforms/InstCombine/InstCombineVectorOps.cpp
View File

@ -25,12 +25,14 @@ static bool CheapToScalarize(Value *V, bool isConstant) {
if (isConstant) return true;
// If all elts are the same, we can extract it and use any of the values.
Constant *Op0 = C->getAggregateElement(0U);
for (unsigned i = 1, e = V->getType()->getVectorNumElements(); i != e; ++i)
if (Constant *Op0 = C->getAggregateElement(0U)) {
for (unsigned i = 1, e = V->getType()->getVectorNumElements(); i != e;
++i)
if (C->getAggregateElement(i) != Op0)
return false;
return true;
}
}
Instruction *I = dyn_cast<Instruction>(V);
if (!I) return false;

8
test/Transforms/InstCombine/vec_extract_var_elt.ll
View File

@ -16,3 +16,11 @@ define void @test (float %b, <8 x float> * %p) {
ret void
}
; PR18600
define i32 @test2(i32 %i) {
%e = extractelement <4 x i32> bitcast (<2 x i64> <i64 1, i64 2> to <4 x i32>), i32 %i
ret i32 %e
; CHECK-LABEL: @test2
; CHECK: extractelement
}