4f86aa650c
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
37 lines
1.7 KiB
LLVM
37 lines
1.7 KiB
LLVM
; RUN: opt -S -loop-vectorize -scalable-vectorization=on -mattr=+sve -mtriple aarch64-linux-gnu < %s | FileCheck %s
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define void @invariant_load(i64 %n, i32* noalias nocapture %a, i32* nocapture readonly %b) {
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; CHECK-LABEL: @invariant_load
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; CHECK: vector.body:
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; CHECK: %[[GEP:.*]] = getelementptr inbounds i32, i32* %b, i64 42
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; CHECK-NEXT: %[[INVLOAD:.*]] = load i32, i32* %[[GEP]]
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; CHECK-NEXT: %[[SPLATINS:.*]] = insertelement <vscale x 4 x i32> poison, i32 %[[INVLOAD]], i32 0
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; CHECK-NEXT: %[[SPLAT:.*]] = shufflevector <vscale x 4 x i32> %[[SPLATINS]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
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; CHECK: %[[LOAD:.*]] = load <vscale x 4 x i32>, <vscale x 4 x i32>*
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; CHECK-NEXT: %[[ADD:.*]] = add nsw <vscale x 4 x i32> %[[SPLAT]], %[[LOAD]]
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; CHECK: store <vscale x 4 x i32> %[[ADD]], <vscale x 4 x i32>*
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entry:
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br label %for.body
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for.body: ; preds = %for.body.lr.ph, %for.body
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 42
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%0 = load i32, i32* %arrayidx, align 4
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%arrayidx1 = getelementptr inbounds i32, i32* %b, i64 %iv
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%1 = load i32, i32* %arrayidx1, align 4
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%add = add nsw i32 %0, %1
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%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %iv
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store i32 %add, i32* %arrayidx2, align 4
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond.not = icmp eq i64 %iv.next, %n
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br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !1
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for.end: ; preds = %for.body
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ret void
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}
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!1 = distinct !{!1, !2, !3, !4}
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!2 = !{!"llvm.loop.vectorize.width", i32 4}
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!3 = !{!"llvm.loop.interleave.count", i32 1}
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!4 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
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