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2e7409ccb5
This patch adds a new option to the LoopVectorizer to control how
scalable vectors can be used.
Initially, this suggests three levels to control scalable
vectorization, although other more aggressive options can be added in
the future.
The possible options are:
- Disabled: Disables vectorization with scalable vectors.
- Enabled: Vectorize loops using scalable vectors or fixed-width
vectors, but favors fixed-width vectors when the cost
is a tie.
- Preferred: Like 'Enabled', but favoring scalable vectors when the
cost-model is inconclusive.
Reviewed By: paulwalker-arm, vkmr
Differential Revision: https://reviews.llvm.org/D101945
103 lines
4.0 KiB
LLVM
103 lines
4.0 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-target-supports-scalable-vectors=true -dce -instcombine -S -scalable-vectorization=on | FileCheck %s
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; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-target-supports-scalable-vectors=true -dce -instcombine -S -scalable-vectorization=preferred | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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; CHECK-LABEL: @test1(
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; CHECK: store <8 x i32>
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; CHECK: ret void
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define void @test1(i32* nocapture %a, i32 %n) #0 {
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entry:
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%cmp4 = icmp sgt i32 %n, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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store i32 42, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !0
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for.end: ; preds = %for.body, %entry
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ret void
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}
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; CHECK-LABEL: @test2(
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; CHECK: store <vscale x 8 x i32>
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; CHECK: ret void
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define void @test2(i32* nocapture %a, i32 %n) #0 {
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entry:
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%cmp4 = icmp sgt i32 %n, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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store i32 42, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !2
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for.end: ; preds = %for.body, %entry
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ret void
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}
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; CHECK-LABEL: @test3(
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; CHECK: store <8 x i32>
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; CHECK: ret void
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define void @test3(i32* nocapture %a, i32 %n) #0 {
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entry:
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%cmp4 = icmp sgt i32 %n, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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store i32 42, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !4
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for.end: ; preds = %for.body, %entry
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ret void
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}
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; Test that when only the width property is specified, and not the scalable.enable flag,
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; that the hint defaults to 'scalable.enable = false'.
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; CHECK-LABEL: @test4(
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; CHECK: store <8 x i32>
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; CHECK: ret void
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define void @test4(i32* nocapture %a, i32 %n) #0 {
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entry:
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%cmp4 = icmp sgt i32 %n, 0
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br i1 %cmp4, label %for.body, label %for.end
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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store i32 42, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !6
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for.end: ; preds = %for.body, %entry
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ret void
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!0 = !{!0, !1, !5}
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!1 = !{!"llvm.loop.vectorize.width", i32 8}
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!2 = !{!2, !1, !3}
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!3 = !{!"llvm.loop.vectorize.scalable.enable", i32 1}
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!4 = !{!4, !1, !5}
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!5 = !{!"llvm.loop.vectorize.scalable.enable", i32 0}
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!6 = !{!6, !7}
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!7 = !{!"llvm.loop.vectorize.width", i32 8}
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