150 lines
5.9 KiB
LLVM
150 lines
5.9 KiB
LLVM
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; RUN: opt < %s -loop-unroll -S | FileCheck %s
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;
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; Verify that the unrolling pass removes existing unroll count metadata
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; and adds a disable unrolling node after unrolling is complete.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; #pragma clang loop vectorize(enable) unroll_count(4) vectorize_width(8)
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;
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; Unroll count metadata should be replaced with unroll(disable). Vectorize
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; metadata should be untouched.
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;
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; CHECK-LABEL: @unroll_count_4(
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; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
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define void @unroll_count_4(i32* nocapture %a) {
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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* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%inc = add nsw i32 %0, 1
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store i32 %inc, i32* %arrayidx, align 4
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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, 64
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br i1 %exitcond, 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 = !{!1, !2, !3, !4}
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!2 = !{!"llvm.loop.vectorize.enable", i1 true}
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!3 = !{!"llvm.loop.unroll.count", i32 4}
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!4 = !{!"llvm.loop.vectorize.width", i32 8}
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; #pragma clang loop unroll(full)
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;
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; An unroll disable metadata node is only added for the unroll count case.
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; In this case, the loop has a full unroll metadata but can't be fully unrolled
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; because the trip count is dynamic. The full unroll metadata should remain
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; after unrolling.
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;
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; CHECK-LABEL: @unroll_full(
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; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_2:.*]]
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define void @unroll_full(i32* nocapture %a, i32 %b) {
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entry:
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%cmp3 = icmp sgt i32 %b, 0
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br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !5
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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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%0 = load i32, i32* %arrayidx, align 4
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%inc = add nsw i32 %0, 1
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store i32 %inc, i32* %arrayidx, align 4
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%indvars.iv.next = add nuw nsw 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, %b
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !5
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for.end: ; preds = %for.body, %entry
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ret void
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}
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!5 = !{!5, !6}
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!6 = !{!"llvm.loop.unroll.full"}
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; #pragma clang loop unroll(disable)
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;
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; Unroll metadata should not change.
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;
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; CHECK-LABEL: @unroll_disable(
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; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
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define void @unroll_disable(i32* nocapture %a) {
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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* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%inc = add nsw i32 %0, 1
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store i32 %inc, i32* %arrayidx, align 4
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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, 64
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !7
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for.end: ; preds = %for.body
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ret void
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}
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!7 = !{!7, !8}
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!8 = !{!"llvm.loop.unroll.disable"}
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; This function contains two loops which share the same llvm.loop metadata node
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; with an llvm.loop.unroll.count 2 hint. Both loops should be unrolled. This
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; verifies that adding disable metadata to a loop after unrolling doesn't affect
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; other loops which previously shared the same llvm.loop metadata.
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;
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; CHECK-LABEL: @shared_metadata(
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; CHECK: store i32
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; CHECK: store i32
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; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_4:.*]]
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; CHECK: store i32
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; CHECK: store i32
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; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_5:.*]]
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define void @shared_metadata(i32* nocapture %List) #0 {
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entry:
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br label %for.body3
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for.body3: ; preds = %for.body3, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body3 ]
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%arrayidx = getelementptr inbounds i32, i32* %List, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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%add4 = add nsw i32 %0, 10
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store i32 %add4, i32* %arrayidx, align 4
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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, 4
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br i1 %exitcond, label %for.body3.1.preheader, label %for.body3, !llvm.loop !9
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for.body3.1.preheader: ; preds = %for.body3
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br label %for.body3.1
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for.body3.1: ; preds = %for.body3.1.preheader, %for.body3.1
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%indvars.iv.1 = phi i64 [ %1, %for.body3.1 ], [ 0, %for.body3.1.preheader ]
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%1 = add nsw i64 %indvars.iv.1, 1
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%arrayidx.1 = getelementptr inbounds i32, i32* %List, i64 %1
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%2 = load i32, i32* %arrayidx.1, align 4
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%add4.1 = add nsw i32 %2, 10
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store i32 %add4.1, i32* %arrayidx.1, align 4
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%exitcond.1 = icmp eq i64 %1, 4
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br i1 %exitcond.1, label %for.inc5.1, label %for.body3.1, !llvm.loop !9
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for.inc5.1: ; preds = %for.body3.1
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ret void
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}
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!9 = !{!9, !10}
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!10 = !{!"llvm.loop.unroll.count", i32 2}
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; CHECK: ![[LOOP_1]] = distinct !{![[LOOP_1]], ![[VEC_ENABLE:.*]], ![[WIDTH_8:.*]], ![[UNROLL_DISABLE:.*]]}
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; CHECK: ![[VEC_ENABLE]] = !{!"llvm.loop.vectorize.enable", i1 true}
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; CHECK: ![[WIDTH_8]] = !{!"llvm.loop.vectorize.width", i32 8}
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; CHECK: ![[UNROLL_DISABLE]] = !{!"llvm.loop.unroll.disable"}
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; CHECK: ![[LOOP_2]] = distinct !{![[LOOP_2]], ![[UNROLL_FULL:.*]]}
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; CHECK: ![[UNROLL_FULL]] = !{!"llvm.loop.unroll.full"}
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; CHECK: ![[LOOP_3]] = distinct !{![[LOOP_3]], ![[UNROLL_DISABLE:.*]]}
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; CHECK: ![[LOOP_4]] = distinct !{![[LOOP_4]], ![[UNROLL_DISABLE:.*]]}
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; CHECK: ![[LOOP_5]] = distinct !{![[LOOP_5]], ![[UNROLL_DISABLE:.*]]}
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