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
63 lines
2.9 KiB
LLVM
63 lines
2.9 KiB
LLVM
; This is the loop in c++ being vectorize in this file with
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; experimental.vector.reverse
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;#pragma clang loop vectorize_width(4, scalable)
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; for (long int i = N - 1; i >= 0; i--)
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; {
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; if (cond[i])
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; a[i] += 1;
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; }
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; The test checks if the mask is being correctly created, reverted and used
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; RUN: opt -loop-vectorize -scalable-vectorization=on -dce -instcombine -mtriple aarch64-linux-gnu -S < %s | FileCheck %s
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-unknown-linux-gnu"
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define void @vector_reverse_mask_nxv4i1(double* %a, double* %cond, i64 %N) #0 {
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; CHECK-LABEL: vector.body:
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; CHECK: %[[REVERSE6:.*]] = call <vscale x 4 x i1> @llvm.experimental.vector.reverse.nxv4i1(<vscale x 4 x i1> %{{.*}})
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; CHECK: %[[WIDEMSKLOAD:.*]] = call <vscale x 4 x double> @llvm.masked.load.nxv4f64.p0nxv4f64(<vscale x 4 x double>* nonnull %{{.*}}, i32 8, <vscale x 4 x i1> %[[REVERSE6]], <vscale x 4 x double> poison)
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; CHECK-NEXT: %[[REVERSE7:.*]] = call <vscale x 4 x double> @llvm.experimental.vector.reverse.nxv4f64(<vscale x 4 x double> %[[WIDEMSKLOAD]])
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; CHECK-NEXT: %[[FADD:.*]] = fadd <vscale x 4 x double> %[[REVERSE7]]
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; CHECK-NEXT: %[[REVERSE8:.*]] = call <vscale x 4 x double> @llvm.experimental.vector.reverse.nxv4f64(<vscale x 4 x double> %[[FADD]])
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; CHECK: %[[REVERSE9:.*]] = call <vscale x 4 x i1> @llvm.experimental.vector.reverse.nxv4i1(<vscale x 4 x i1> %{{.*}})
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; CHECK: call void @llvm.masked.store.nxv4f64.p0nxv4f64(<vscale x 4 x double> %[[REVERSE8]], <vscale x 4 x double>* %{{.*}}, i32 8, <vscale x 4 x i1> %[[REVERSE9]]
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entry:
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%cmp7 = icmp sgt i64 %N, 0
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br i1 %cmp7, label %for.body, label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond.cleanup, %entry
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ret void
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for.body: ; preds = %for.body, %entry
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%i.08.in = phi i64 [ %i.08, %for.inc ], [ %N, %entry ]
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%i.08 = add nsw i64 %i.08.in, -1
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%arrayidx = getelementptr inbounds double, double* %cond, i64 %i.08
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%0 = load double, double* %arrayidx, align 8
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%tobool = fcmp une double %0, 0.000000e+00
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br i1 %tobool, label %if.then, label %for.inc
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if.then: ; preds = %for.body
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%arrayidx1 = getelementptr inbounds double, double* %a, i64 %i.08
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%1 = load double, double* %arrayidx1, align 8
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%add = fadd double %1, 1.000000e+00
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store double %add, double* %arrayidx1, align 8
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br label %for.inc
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for.inc: ; preds = %for.body, %if.then
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%cmp = icmp sgt i64 %i.08.in, 1
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br i1 %cmp, label %for.body, label %for.cond.cleanup, !llvm.loop !0
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}
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attributes #0 = {"target-cpu"="generic" "target-features"="+neon,+sve"}
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!0 = distinct !{!0, !1, !2, !3, !4}
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!1 = !{!"llvm.loop.mustprogress"}
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!2 = !{!"llvm.loop.vectorize.width", i32 4}
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!3 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
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!4 = !{!"llvm.loop.vectorize.enable", i1 true}
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