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SLP Vectorier: Don't vectorize really short chains because they are already handled by the SelectionDAG store-vectorizer, which does a better job in deciding when to vectorize.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187267 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-07-26 23:07:55 +00:00
parent a629c3a4f0
commit 67a38a2875
2 changed files with 9 additions and 3 deletions
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4
test/Transforms/SLPVectorizer/X86/reduction2.ll
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@@ -16,11 +16,13 @@ define double @foo(double* nocapture %D) {
%3 = getelementptr inbounds double* %D, i32 %2
%4 = load double* %3, align 4
%A4 = fmul double %4, %4
%A42 = fmul double %A4, %A4
%5 = or i32 %2, 1
%6 = getelementptr inbounds double* %D, i32 %5
%7 = load double* %6, align 4
%A7 = fmul double %7, %7
%8 = fadd double %A4, %A7
%A72 = fmul double %A7, %A7
%8 = fadd double %A42, %A72
%9 = fadd double %sum.01, %8
%10 = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %10, 100