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Do not vectorize loops with subtraction reductions

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Since subtraction does not commute the loop vectorizer incorrectly vectorizes
reductions such as x = A[i] - x.

Disabling for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Paul Redmond
2013-01-04 22:10:16 +00:00
parent 8cab6edf4f
commit 5767d91956
3 changed files with 51 additions and 2 deletions
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2
test/Transforms/LoopVectorize/gcc-examples.ll
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@ -241,7 +241,7 @@ define void @example8(i32 %x) nounwind uwtable ssp {
}
;CHECK: @example9
;CHECK: phi <4 x i32>
;CHECK-NOT: phi <4 x i32>
;CHECK: ret i32
define i32 @example9() nounwind uwtable readonly ssp {
br label %1