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16b23e95d5
The cost for a branch after vectorization is very different depending on if the vectorizer will if-convert the block (branch is eliminated), or if scalarized and predicated blocks will be produced (branch duplicated before each block). There is also the case of remaining scalar branches, such as the back-edge branch. This patch handles these cases differently with TTI based cost estimates. Review: Matthew Simpson https://reviews.llvm.org/D31175 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300058 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.4 KiB
LLVM
39 lines
1.4 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -mtriple=s390x-unknown-linux -mcpu=z13 -loop-vectorize \
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; RUN: -force-vector-width=2 -debug-only=loop-vectorize \
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; RUN: -disable-output < %s 2>&1 | FileCheck %s
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; Check costs for branches inside a vectorized loop around predicated
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; blocks. Each such branch will be guarded with an extractelement from the
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; vector compare plus a test under mask instruction. This cost is modelled on
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; the extractelement of i1.
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define void @fun(i32* %arr, i64 %trip.count) {
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entry:
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %arr, i64 %indvars.iv
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%l = load i32, i32* %arrayidx, align 4
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%cmp55 = icmp sgt i32 %l, 0
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br i1 %cmp55, label %if.then, label %for.inc
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if.then:
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%sub = sub nsw i32 0, %l
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store i32 %sub, i32* %arrayidx, align 4
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br label %for.inc
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for.inc:
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, %trip.count
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit:
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ret void
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; CHECK: LV: Found an estimated cost of 5 for VF 2 For instruction: br i1 %cmp55, label %if.then, label %for.inc
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; CHECK: LV: Found an estimated cost of 0 for VF 2 For instruction: br label %for.inc
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; CHECK: LV: Found an estimated cost of 0 for VF 2 For instruction: br i1 %exitcond, label %for.end.loopexit, label %for.body
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}
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