116 lines
4.7 KiB
LLVM
116 lines
4.7 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | 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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target triple = "x86_64-unknown-linux-gnu"
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; A tricky loop:
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;
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; void loop(int *a, int *b) {
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; for (int i = 0; i < 512; ++i) {
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; a[a[i]] = b[i];
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; a[i] = b[i+1];
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; }
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;}
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;CHECK-LABEL: @loop(
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;CHECK-NOT: <4 x i32>
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define void @loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%1 = load i32, i32* %arrayidx2, align 4
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%idxprom3 = sext i32 %1 to i64
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%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
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store i32 %0, i32* %arrayidx4, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
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%2 = load i32, i32* %arrayidx6, align 4
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store i32 %2, i32* %arrayidx2, align 4
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 512
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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; The same loop with parallel loop metadata added to the loop branch
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; and the memory instructions.
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;CHECK-LABEL: @parallel_loop(
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;CHECK: <4 x i32>
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define void @parallel_loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4, !llvm.access.group !13
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%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%1 = load i32, i32* %arrayidx2, align 4, !llvm.access.group !13
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%idxprom3 = sext i32 %1 to i64
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%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
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; This store might have originated from inlining a function with a parallel
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; loop. Refers to a list with the "original loop reference" (!4) also included.
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store i32 %0, i32* %arrayidx4, align 4, !llvm.access.group !15
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%indvars.iv.next = add i64 %indvars.iv, 1
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%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
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%2 = load i32, i32* %arrayidx6, align 4, !llvm.access.group !13
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store i32 %2, i32* %arrayidx2, align 4, !llvm.access.group !13
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 512
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3
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for.end: ; preds = %for.body
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ret void
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}
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; The same loop with an illegal parallel loop metadata: the memory
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; accesses refer to a different loop's identifier.
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;CHECK-LABEL: @mixed_metadata(
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;CHECK-NOT: <4 x i32>
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define void @mixed_metadata(i32* nocapture %a, i32* nocapture %b) nounwind uwtable {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4, !llvm.access.group !16
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%arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%1 = load i32, i32* %arrayidx2, align 4, !llvm.access.group !16
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%idxprom3 = sext i32 %1 to i64
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%arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3
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; This refers to the loop marked with !7 which we are not in at the moment.
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; It should prevent detecting as a parallel loop.
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store i32 %0, i32* %arrayidx4, align 4, !llvm.access.group !17
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%indvars.iv.next = add i64 %indvars.iv, 1
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%arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next
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%2 = load i32, i32* %arrayidx6, align 4, !llvm.access.group !16
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store i32 %2, i32* %arrayidx2, align 4, !llvm.access.group !16
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 512
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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
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ret void
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}
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!3 = !{!3, !{!"llvm.loop.parallel_accesses", !13, !15}}
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!4 = !{!4, !{!"llvm.loop.parallel_accesses", !14, !15}}
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!6 = !{!6, !{!"llvm.loop.parallel_accesses", !16}}
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!7 = !{!7, !{!"llvm.loop.parallel_accesses", !17}}
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!13 = distinct !{}
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!14 = distinct !{}
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!15 = distinct !{}
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!16 = distinct !{}
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!17 = distinct !{}
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