1 ; RUN: opt < %s -loop-unroll -pragma-unroll-threshold=1024 -S | FileCheck %s
2 ; RUN: opt < %s -loop-unroll -loop-unroll -pragma-unroll-threshold=1024 -S | FileCheck %s
4 ; Run loop unrolling twice to verify that loop unrolling metadata is properly
5 ; removed and further unrolling is disabled after the pass is run once.
7 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
8 target triple = "x86_64-unknown-linux-gnu"
10 ; loop4 contains a small loop which should be completely unrolled by
11 ; the default unrolling heuristics. It serves as a control for the
12 ; unroll(disable) pragma test loop4_with_disable.
14 ; CHECK-LABEL: @loop4(
16 define void @loop4(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, i32* %a, i64 %indvars.iv
23 %0 = load i32, 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, 4
28 br i1 %exitcond, label %for.end, label %for.body
30 for.end: ; preds = %for.body
34 ; #pragma clang loop unroll(disable)
36 ; CHECK-LABEL: @loop4_with_disable(
38 ; CHECK-NOT: store i32
40 define void @loop4_with_disable(i32* nocapture %a) {
44 for.body: ; preds = %for.body, %entry
45 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
46 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
47 %0 = load i32, i32* %arrayidx, align 4
48 %inc = add nsw i32 %0, 1
49 store i32 %inc, i32* %arrayidx, align 4
50 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
51 %exitcond = icmp eq i64 %indvars.iv.next, 4
52 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !1
54 for.end: ; preds = %for.body
58 !2 = !{!"llvm.loop.unroll.disable"}
60 ; loop64 has a high enough count that it should *not* be unrolled by
61 ; the default unrolling heuristic. It serves as the control for the
62 ; unroll(full) pragma test loop64_with_.* tests below.
64 ; CHECK-LABEL: @loop64(
66 ; CHECK-NOT: store i32
68 define void @loop64(i32* nocapture %a) {
72 for.body: ; preds = %for.body, %entry
73 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
74 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
75 %0 = load i32, i32* %arrayidx, align 4
76 %inc = add nsw i32 %0, 1
77 store i32 %inc, i32* %arrayidx, align 4
78 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
79 %exitcond = icmp eq i64 %indvars.iv.next, 64
80 br i1 %exitcond, label %for.end, label %for.body
82 for.end: ; preds = %for.body
86 ; #pragma clang loop unroll(full)
87 ; Loop should be fully unrolled.
89 ; CHECK-LABEL: @loop64_with_full(
91 define void @loop64_with_full(i32* nocapture %a) {
95 for.body: ; preds = %for.body, %entry
96 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
97 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
98 %0 = load i32, i32* %arrayidx, align 4
99 %inc = add nsw i32 %0, 1
100 store i32 %inc, i32* %arrayidx, align 4
101 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
102 %exitcond = icmp eq i64 %indvars.iv.next, 64
103 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3
105 for.end: ; preds = %for.body
109 !4 = !{!"llvm.loop.unroll.full"}
111 ; #pragma clang loop unroll_count(4)
112 ; Loop should be unrolled 4 times.
114 ; CHECK-LABEL: @loop64_with_count4(
119 ; CHECK-NOT: store i32
121 define void @loop64_with_count4(i32* nocapture %a) {
125 for.body: ; preds = %for.body, %entry
126 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
127 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
128 %0 = load i32, i32* %arrayidx, align 4
129 %inc = add nsw i32 %0, 1
130 store i32 %inc, i32* %arrayidx, align 4
131 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
132 %exitcond = icmp eq i64 %indvars.iv.next, 64
133 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !5
135 for.end: ; preds = %for.body
139 !6 = !{!"llvm.loop.unroll.count", i32 4}
141 ; #pragma clang loop unroll(full)
142 ; Full unrolling is requested, but loop has a runtime trip count so
143 ; no unrolling should occur.
145 ; CHECK-LABEL: @runtime_loop_with_full(
147 ; CHECK-NOT: store i32
148 define void @runtime_loop_with_full(i32* nocapture %a, i32 %b) {
150 %cmp3 = icmp sgt i32 %b, 0
151 br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !8
153 for.body: ; preds = %entry, %for.body
154 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
155 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
156 %0 = load i32, i32* %arrayidx, align 4
157 %inc = add nsw i32 %0, 1
158 store i32 %inc, i32* %arrayidx, align 4
159 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
160 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
161 %exitcond = icmp eq i32 %lftr.wideiv, %b
162 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !8
164 for.end: ; preds = %for.body, %entry
169 ; #pragma clang loop unroll_count(4)
170 ; Loop has a runtime trip count. Runtime unrolling should occur and loop
171 ; should be duplicated (original and 4x unrolled).
173 ; CHECK-LABEL: @runtime_loop_with_count4(
174 ; CHECK: for.body.prol:
185 define void @runtime_loop_with_count4(i32* nocapture %a, i32 %b) {
187 %cmp3 = icmp sgt i32 %b, 0
188 br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !9
190 for.body: ; preds = %entry, %for.body
191 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
192 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
193 %0 = load i32, i32* %arrayidx, align 4
194 %inc = add nsw i32 %0, 1
195 store i32 %inc, i32* %arrayidx, align 4
196 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
197 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
198 %exitcond = icmp eq i32 %lftr.wideiv, %b
199 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !9
201 for.end: ; preds = %for.body, %entry
206 ; #pragma clang loop unroll_count(1)
207 ; Loop should not be unrolled
209 ; CHECK-LABEL: @unroll_1(
211 ; CHECK-NOT: store i32
213 define void @unroll_1(i32* nocapture %a, i32 %b) {
217 for.body: ; preds = %for.body, %entry
218 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
219 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
220 %0 = load i32, i32* %arrayidx, align 4
221 %inc = add nsw i32 %0, 1
222 store i32 %inc, i32* %arrayidx, align 4
223 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
224 %exitcond = icmp eq i64 %indvars.iv.next, 4
225 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !10
227 for.end: ; preds = %for.body
231 !11 = !{!"llvm.loop.unroll.count", i32 1}
233 ; #pragma clang loop unroll(full)
234 ; Loop has very high loop count (1 million) and full unrolling was requested.
235 ; Loop should unrolled up to the pragma threshold, but not completely.
237 ; CHECK-LABEL: @unroll_1M(
241 define void @unroll_1M(i32* nocapture %a, i32 %b) {
245 for.body: ; preds = %for.body, %entry
246 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
247 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
248 %0 = load i32, i32* %arrayidx, align 4
249 %inc = add nsw i32 %0, 1
250 store i32 %inc, i32* %arrayidx, align 4
251 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
252 %exitcond = icmp eq i64 %indvars.iv.next, 1000000
253 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !12
255 for.end: ; preds = %for.body
260 ; #pragma clang loop unroll(enable)
261 ; Loop should be fully unrolled.
263 ; CHECK-LABEL: @loop64_with_enable(
265 define void @loop64_with_enable(i32* nocapture %a) {
269 for.body: ; preds = %for.body, %entry
270 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
271 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
272 %0 = load i32, i32* %arrayidx, align 4
273 %inc = add nsw i32 %0, 1
274 store i32 %inc, i32* %arrayidx, align 4
275 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
276 %exitcond = icmp eq i64 %indvars.iv.next, 64
277 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !13
279 for.end: ; preds = %for.body
283 !14 = !{!"llvm.loop.unroll.enable"}
285 ; #pragma clang loop unroll(enable)
286 ; Loop has a runtime trip count and should be runtime unrolled and duplicated
289 ; CHECK-LABEL: @runtime_loop_with_enable(
290 ; CHECK: for.body.prol:
303 ; CHECK-NOT: store i32
305 define void @runtime_loop_with_enable(i32* nocapture %a, i32 %b) {
307 %cmp3 = icmp sgt i32 %b, 0
308 br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !8
310 for.body: ; preds = %entry, %for.body
311 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
312 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
313 %0 = load i32, i32* %arrayidx, align 4
314 %inc = add nsw i32 %0, 1
315 store i32 %inc, i32* %arrayidx, align 4
316 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
317 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
318 %exitcond = icmp eq i32 %lftr.wideiv, %b
319 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !15
321 for.end: ; preds = %for.body, %entry