1 ; RUN: opt < %s -passes=loop-vectorize -enable-vplan-native-path -debug-only=loop-vectorize -S 2>&1 | FileCheck %s
4 ; Verify that outer loops annotated only with the expected explicit
5 ; vectorization hints are collected for vectorization instead of inner loops.
7 ; Root C/C++ source code for all the test cases
8 ; void foo(int *a, int *b, int N, int M)
11 ; #pragma clang loop vectorize(enable)
12 ; for (i = 0; i < N; i++) {
13 ; for (j = 0; j < M; j++) {
14 ; a[i*M+j] = bptr b[i*M+j];
19 ; Case 1: Annotated outer loop WITH vector width information must be collected.
21 ; CHECK-LABEL: vector_width
22 ; CHECK: LV: Loop hints: force=enabled width=4 interleave=0
23 ; CHECK: LV: We can vectorize this outer loop!
24 ; CHECK: LV: Using user VF 4 to build VPlans.
25 ; CHECK-NOT: LV: Loop hints: force=?
26 ; CHECK-NOT: LV: Found a loop: inner.body
28 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
30 define void @vector_width(ptr nocapture %a, ptr nocapture readonly %b, i32 %N, i32 %M) local_unnamed_addr {
32 %cmp32 = icmp sgt i32 %N, 0
33 br i1 %cmp32, label %outer.ph, label %for.end15
35 outer.ph: ; preds = %entry
36 %cmp230 = icmp sgt i32 %M, 0
37 %0 = sext i32 %M to i64
38 %wide.trip.count = zext i32 %M to i64
39 %wide.trip.count38 = zext i32 %N to i64
42 outer.body: ; preds = %outer.inc, %outer.ph
43 %indvars.iv35 = phi i64 [ 0, %outer.ph ], [ %indvars.iv.next36, %outer.inc ]
44 br i1 %cmp230, label %inner.ph, label %outer.inc
46 inner.ph: ; preds = %outer.body
47 %1 = mul nsw i64 %indvars.iv35, %0
50 inner.body: ; preds = %inner.body, %inner.ph
51 %indvars.iv = phi i64 [ 0, %inner.ph ], [ %indvars.iv.next, %inner.body ]
52 %2 = add nsw i64 %indvars.iv, %1
53 %arrayidx = getelementptr inbounds i32, ptr %b, i64 %2
54 %3 = load i32, ptr %arrayidx, align 4, !tbaa !2
55 %mul8 = mul nsw i32 %3, %3
56 %arrayidx12 = getelementptr inbounds i32, ptr %a, i64 %2
57 store i32 %mul8, ptr %arrayidx12, align 4, !tbaa !2
58 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
59 %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
60 br i1 %exitcond, label %outer.inc, label %inner.body
62 outer.inc: ; preds = %inner.body, %outer.body
63 %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
64 %exitcond39 = icmp eq i64 %indvars.iv.next36, %wide.trip.count38
65 br i1 %exitcond39, label %for.end15, label %outer.body, !llvm.loop !6
67 for.end15: ; preds = %outer.inc, %entry
71 ; Case 2: Annotated outer loop WITHOUT vector width information must be collected.
74 ; CHECK: LV: Loop hints: force=enabled width=0 interleave=0
75 ; CHECK: LV: We can vectorize this outer loop!
76 ; CHECK: LV: Using VF 1 to build VPlans.
78 define void @case2(ptr nocapture %a, ptr nocapture readonly %b, i32 %N, i32 %M) local_unnamed_addr {
80 %cmp32 = icmp sgt i32 %N, 0
81 br i1 %cmp32, label %outer.ph, label %for.end15
83 outer.ph: ; preds = %entry
84 %cmp230 = icmp sgt i32 %M, 0
85 %0 = sext i32 %M to i64
86 %wide.trip.count = zext i32 %M to i64
87 %wide.trip.count38 = zext i32 %N to i64
90 outer.body: ; preds = %outer.inc, %outer.ph
91 %indvars.iv35 = phi i64 [ 0, %outer.ph ], [ %indvars.iv.next36, %outer.inc ]
92 br i1 %cmp230, label %inner.ph, label %outer.inc
94 inner.ph: ; preds = %outer.body
95 %1 = mul nsw i64 %indvars.iv35, %0
98 inner.body: ; preds = %inner.body, %inner.ph
99 %indvars.iv = phi i64 [ 0, %inner.ph ], [ %indvars.iv.next, %inner.body ]
100 %2 = add nsw i64 %indvars.iv, %1
101 %arrayidx = getelementptr inbounds i32, ptr %b, i64 %2
102 %3 = load i32, ptr %arrayidx, align 4, !tbaa !2
103 %mul8 = mul nsw i32 %3, %3
104 %arrayidx12 = getelementptr inbounds i32, ptr %a, i64 %2
105 store i32 %mul8, ptr %arrayidx12, align 4, !tbaa !2
106 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
107 %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
108 br i1 %exitcond, label %outer.inc, label %inner.body
110 outer.inc: ; preds = %inner.body, %outer.body
111 %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
112 %exitcond39 = icmp eq i64 %indvars.iv.next36, %wide.trip.count38
113 br i1 %exitcond39, label %for.end15, label %outer.body, !llvm.loop !9
115 for.end15: ; preds = %outer.inc, %entry
119 ; Case 3: Annotated outer loop WITH vector width and interleave information
120 ; doesn't have to be collected.
123 ; CHECK-NOT: LV: Loop hints: force=enabled
124 ; CHECK-NOT: LV: We can vectorize this outer loop!
125 ; CHECK: LV: Loop hints: force=?
126 ; CHECK: LV: Found a loop: inner.body
128 define void @case3(ptr nocapture %a, ptr nocapture readonly %b, i32 %N, i32 %M) local_unnamed_addr {
130 %cmp32 = icmp sgt i32 %N, 0
131 br i1 %cmp32, label %outer.ph, label %for.end15
133 outer.ph: ; preds = %entry
134 %cmp230 = icmp sgt i32 %M, 0
135 %0 = sext i32 %M to i64
136 %wide.trip.count = zext i32 %M to i64
137 %wide.trip.count38 = zext i32 %N to i64
140 outer.body: ; preds = %outer.inc, %outer.ph
141 %indvars.iv35 = phi i64 [ 0, %outer.ph ], [ %indvars.iv.next36, %outer.inc ]
142 br i1 %cmp230, label %inner.ph, label %outer.inc
144 inner.ph: ; preds = %outer.body
145 %1 = mul nsw i64 %indvars.iv35, %0
148 inner.body: ; preds = %inner.body, %inner.ph
149 %indvars.iv = phi i64 [ 0, %inner.ph ], [ %indvars.iv.next, %inner.body ]
150 %2 = add nsw i64 %indvars.iv, %1
151 %arrayidx = getelementptr inbounds i32, ptr %b, i64 %2
152 %3 = load i32, ptr %arrayidx, align 4, !tbaa !2
153 %mul8 = mul nsw i32 %3, %3
154 %arrayidx12 = getelementptr inbounds i32, ptr %a, i64 %2
155 store i32 %mul8, ptr %arrayidx12, align 4, !tbaa !2
156 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
157 %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
158 br i1 %exitcond, label %outer.inc, label %inner.body
160 outer.inc: ; preds = %inner.body, %outer.body
161 %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
162 %exitcond39 = icmp eq i64 %indvars.iv.next36, %wide.trip.count38
163 br i1 %exitcond39, label %for.end15, label %outer.body, !llvm.loop !11
165 for.end15: ; preds = %outer.inc, %entry
169 ; Case 4: Outer loop without any explicit vectorization annotation doesn't have
173 ; CHECK-NOT: LV: Loop hints: force=enabled
174 ; CHECK-NOT: LV: We can vectorize this outer loop!
175 ; CHECK: LV: Loop hints: force=?
176 ; CHECK: LV: Found a loop: inner.body
178 define void @case4(ptr nocapture %a, ptr nocapture readonly %b, i32 %N, i32 %M) local_unnamed_addr {
180 %cmp32 = icmp sgt i32 %N, 0
181 br i1 %cmp32, label %outer.ph, label %for.end15
183 outer.ph: ; preds = %entry
184 %cmp230 = icmp sgt i32 %M, 0
185 %0 = sext i32 %M to i64
186 %wide.trip.count = zext i32 %M to i64
187 %wide.trip.count38 = zext i32 %N to i64
190 outer.body: ; preds = %outer.inc, %outer.ph
191 %indvars.iv35 = phi i64 [ 0, %outer.ph ], [ %indvars.iv.next36, %outer.inc ]
192 br i1 %cmp230, label %inner.ph, label %outer.inc
194 inner.ph: ; preds = %outer.body
195 %1 = mul nsw i64 %indvars.iv35, %0
198 inner.body: ; preds = %inner.body, %inner.ph
199 %indvars.iv = phi i64 [ 0, %inner.ph ], [ %indvars.iv.next, %inner.body ]
200 %2 = add nsw i64 %indvars.iv, %1
201 %arrayidx = getelementptr inbounds i32, ptr %b, i64 %2
202 %3 = load i32, ptr %arrayidx, align 4, !tbaa !2
203 %mul8 = mul nsw i32 %3, %3
204 %arrayidx12 = getelementptr inbounds i32, ptr %a, i64 %2
205 store i32 %mul8, ptr %arrayidx12, align 4, !tbaa !2
206 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
207 %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
208 br i1 %exitcond, label %outer.inc, label %inner.body
210 outer.inc: ; preds = %inner.body, %outer.body
211 %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
212 %exitcond39 = icmp eq i64 %indvars.iv.next36, %wide.trip.count38
213 br i1 %exitcond39, label %for.end15, label %outer.body
215 for.end15: ; preds = %outer.inc, %entry
219 !llvm.module.flags = !{!0}
222 !0 = !{i32 1, !"wchar_size", i32 4}
223 !1 = !{!"clang version 6.0.0"}
224 !2 = !{!3, !3, i64 0}
225 !3 = !{!"int", !4, i64 0}
226 !4 = !{!"omnipotent char", !5, i64 0}
227 !5 = !{!"Simple C/C++ TBAA"}
229 !6 = distinct !{!6, !7, !8}
230 !7 = !{!"llvm.loop.vectorize.width", i32 4}
231 !8 = !{!"llvm.loop.vectorize.enable", i1 true}
233 !9 = distinct !{!9, !8}
235 !10 = !{!"llvm.loop.interleave.count", i32 2}
236 !11 = distinct !{!11, !7, !10, !8}