1 ; RUN: opt < %s -loop-unroll -S | FileCheck %s
3 ; Verify that the unrolling pass removes existing unroll count metadata
4 ; and adds a disable unrolling node after unrolling is complete.
6 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
7 target triple = "x86_64-unknown-linux-gnu"
9 ; #pragma clang loop vectorize(enable) unroll_count(4) vectorize_width(8)
11 ; Unroll count metadata should be replaced with unroll(disable). Vectorize
12 ; metadata should be untouched.
14 ; CHECK-LABEL: @loop1(
15 ; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_1:.*]]
16 define void @loop1(i32* nocapture %a) {
20 for.body: ; preds = %for.body, %entry
21 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
22 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
23 %0 = load i32* %arrayidx, align 4
24 %inc = add nsw i32 %0, 1
25 store i32 %inc, i32* %arrayidx, align 4
26 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
27 %exitcond = icmp eq i64 %indvars.iv.next, 64
28 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !1
30 for.end: ; preds = %for.body
33 !1 = metadata !{metadata !1, metadata !2, metadata !3, metadata !4}
34 !2 = metadata !{metadata !"llvm.loop.vectorize.enable", i1 true}
35 !3 = metadata !{metadata !"llvm.loop.unroll.count", i32 4}
36 !4 = metadata !{metadata !"llvm.loop.vectorize.width", i32 8}
38 ; #pragma clang loop unroll(full)
40 ; An unroll disable metadata node is only added for the unroll count case.
41 ; In this case, the loop has a full unroll metadata but can't be fully unrolled
42 ; because the trip count is dynamic. The full unroll metadata should remain
45 ; CHECK-LABEL: @loop2(
46 ; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_2:.*]]
47 define void @loop2(i32* nocapture %a, i32 %b) {
49 %cmp3 = icmp sgt i32 %b, 0
50 br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !5
52 for.body: ; preds = %entry, %for.body
53 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
54 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
55 %0 = load i32* %arrayidx, align 4
56 %inc = add nsw i32 %0, 1
57 store i32 %inc, i32* %arrayidx, align 4
58 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
59 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
60 %exitcond = icmp eq i32 %lftr.wideiv, %b
61 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !5
63 for.end: ; preds = %for.body, %entry
66 !5 = metadata !{metadata !5, metadata !6}
67 !6 = metadata !{metadata !"llvm.loop.unroll.full"}
69 ; #pragma clang loop unroll(disable)
71 ; Unroll metadata should not change.
73 ; CHECK-LABEL: @loop3(
74 ; CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !llvm.loop ![[LOOP_3:.*]]
75 define void @loop3(i32* nocapture %a) {
79 for.body: ; preds = %for.body, %entry
80 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
81 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
82 %0 = load i32* %arrayidx, align 4
83 %inc = add nsw i32 %0, 1
84 store i32 %inc, i32* %arrayidx, align 4
85 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
86 %exitcond = icmp eq i64 %indvars.iv.next, 64
87 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !7
89 for.end: ; preds = %for.body
92 !7 = metadata !{metadata !7, metadata !8}
93 !8 = metadata !{metadata !"llvm.loop.unroll.disable"}
95 ; CHECK: ![[LOOP_1]] = metadata !{metadata ![[LOOP_1]], metadata ![[VEC_ENABLE:.*]], metadata ![[WIDTH_8:.*]], metadata ![[UNROLL_DISABLE:.*]]}
96 ; CHECK: ![[VEC_ENABLE]] = metadata !{metadata !"llvm.loop.vectorize.enable", i1 true}
97 ; CHECK: ![[WIDTH_8]] = metadata !{metadata !"llvm.loop.vectorize.width", i32 8}
98 ; CHECK: ![[UNROLL_DISABLE]] = metadata !{metadata !"llvm.loop.unroll.disable"}
99 ; CHECK: ![[LOOP_2]] = metadata !{metadata ![[LOOP_2]], metadata ![[UNROLL_FULL:.*]]}
100 ; CHECK: ![[UNROLL_FULL]] = metadata !{metadata !"llvm.loop.unroll.full"}
101 ; CHECK: ![[LOOP_3]] = metadata !{metadata ![[LOOP_3]], metadata ![[UNROLL_DISABLE:.*]]}