1 ; RUN: opt -S -passes=loop-rotate -verify-memoryssa < %s | FileCheck %s --implicit-check-not=dbg.value
2 ; RUN: opt -S -passes=loop-rotate -verify-memoryssa < %s --try-experimental-debuginfo-iterators | FileCheck %s --implicit-check-not=dbg.value
4 declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
5 declare void @llvm.dbg.value(metadata, metadata, metadata) nounwind readnone
8 ; This function rotates the exit conditon into the entry block, moving the
9 ; dbg.values with it. Check that they resolve through the PHIs to the arguments
10 ; only in the entry block. In the loop block, the dbg.values shift down below
11 ; the calls and resolve to them. Then even more dbg.values are inserted on the
12 ; newly produced PHIs at the start.
14 define i32 @tak(i32 %x, i32 %y, i32 %z) nounwind ssp !dbg !0 {
15 ; CHECK-LABEL: define i32 @tak(
17 ; CHECK-NEXT: #dbg_value(i32 %x
18 ; CHECK-NEXT: #dbg_value(i32 %y
19 ; CHECK-NEXT: #dbg_value(i32 %z
20 ; CHECK: if.then.lr.ph:
22 ; CHECK-NEXT: %z.tr4 = phi
23 ; CHECK-NEXT: %y.tr3 = phi
24 ; CHECK-NEXT: %x.tr2 = phi
25 ; CHECK-NEXT: #dbg_value(i32 %z.tr4
26 ; CHECK-NEXT: #dbg_value(i32 %y.tr3
27 ; CHECK-NEXT: #dbg_value(i32 %x.tr2
28 ; CHECK: %call = tail call i32 @tak(i32
29 ; CHECK: %call9 = tail call i32 @tak(i32
30 ; CHECK: %call14 = tail call i32 @tak(i32
31 ; CHECK-NEXT: #dbg_value(i32 %call
32 ; CHECK-NEXT: #dbg_value(i32 %call9
33 ; CHECK-NEXT: #dbg_value(i32 %call14
37 tailrecurse: ; preds = %if.then, %entry
38 %x.tr = phi i32 [ %x, %entry ], [ %call, %if.then ]
39 %y.tr = phi i32 [ %y, %entry ], [ %call9, %if.then ]
40 %z.tr = phi i32 [ %z, %entry ], [ %call14, %if.then ]
41 tail call void @llvm.dbg.value(metadata i32 %x.tr, metadata !6, metadata !DIExpression()), !dbg !7
42 tail call void @llvm.dbg.value(metadata i32 %y.tr, metadata !8, metadata !DIExpression()), !dbg !9
43 tail call void @llvm.dbg.value(metadata i32 %z.tr, metadata !10, metadata !DIExpression()), !dbg !11
44 %cmp = icmp slt i32 %y.tr, %x.tr, !dbg !12
45 br i1 %cmp, label %if.then, label %if.end, !dbg !12
47 if.then: ; preds = %tailrecurse
48 %sub = sub nsw i32 %x.tr, 1, !dbg !14
49 %call = tail call i32 @tak(i32 %sub, i32 %y.tr, i32 %z.tr), !dbg !14
50 %sub6 = sub nsw i32 %y.tr, 1, !dbg !14
51 %call9 = tail call i32 @tak(i32 %sub6, i32 %z.tr, i32 %x.tr), !dbg !14
52 %sub11 = sub nsw i32 %z.tr, 1, !dbg !14
53 %call14 = tail call i32 @tak(i32 %sub11, i32 %x.tr, i32 %y.tr), !dbg !14
56 if.end: ; preds = %tailrecurse
57 br label %return, !dbg !16
59 return: ; preds = %if.end
60 ret i32 %z.tr, !dbg !17
63 ; Repeat of the tak function, with only one DILocalVariable, checking that we
64 ; don't insert duplicate debug intrinsics. The initial duplicates are preserved.
65 ; FIXME: this test checks for the de-duplication behaviour that loop-rotate
66 ; has today, however it might not be correct. In the if.then block the preserved
67 ; dbg.value is for %x -- should not the _last_dbg.value, for %z, have been
69 define i32 @tak_dup(i32 %x, i32 %y, i32 %z) nounwind ssp !dbg !50 {
70 ; CHECK-LABEL: define i32 @tak_dup(
72 ; CHECK-NEXT: #dbg_value(i32 %x
73 ; CHECK-NEXT: #dbg_value(i32 %y
74 ; CHECK-NEXT: #dbg_value(i32 %z
75 ; CHECK: if.then.lr.ph:
77 ; CHECK-NEXT: %z.tr4 = phi
78 ; CHECK-NEXT: %y.tr3 = phi
79 ; CHECK-NEXT: %x.tr2 = phi
80 ; CHECK-NEXT: #dbg_value(i32 %x.tr2
81 ; CHECK: %call = tail call i32 @tak(i32
82 ; CHECK: %call9 = tail call i32 @tak(i32
83 ; CHECK: %call14 = tail call i32 @tak(i32
84 ; CHECK-NEXT: #dbg_value(i32 %call14
88 tailrecurse: ; preds = %if.then, %entry
89 %x.tr = phi i32 [ %x, %entry ], [ %call, %if.then ]
90 %y.tr = phi i32 [ %y, %entry ], [ %call9, %if.then ]
91 %z.tr = phi i32 [ %z, %entry ], [ %call14, %if.then ]
92 tail call void @llvm.dbg.value(metadata i32 %x.tr, metadata !60, metadata !DIExpression()), !dbg !61
93 tail call void @llvm.dbg.value(metadata i32 %y.tr, metadata !60, metadata !DIExpression()), !dbg !61
94 tail call void @llvm.dbg.value(metadata i32 %z.tr, metadata !60, metadata !DIExpression()), !dbg !61
95 %cmp = icmp slt i32 %y.tr, %x.tr, !dbg !62
96 br i1 %cmp, label %if.then, label %if.end, !dbg !62
98 if.then: ; preds = %tailrecurse
99 %sub = sub nsw i32 %x.tr, 1, !dbg !64
100 %call = tail call i32 @tak(i32 %sub, i32 %y.tr, i32 %z.tr), !dbg !64
101 %sub6 = sub nsw i32 %y.tr, 1, !dbg !64
102 %call9 = tail call i32 @tak(i32 %sub6, i32 %z.tr, i32 %x.tr), !dbg !64
103 %sub11 = sub nsw i32 %z.tr, 1, !dbg !64
104 %call14 = tail call i32 @tak(i32 %sub11, i32 %x.tr, i32 %y.tr), !dbg !64
105 br label %tailrecurse
107 if.end: ; preds = %tailrecurse
108 br label %return, !dbg !66
110 return: ; preds = %if.end
111 ret i32 %z.tr, !dbg !67
114 ; Check that the dbg.values move up to being immediately below the PHIs,
115 ; using their Values. However once we exit the loop, the x and y values
116 ; become irrelevant and undef, only z gets an LCSSA PHI to preserve it.
118 ; Note that while the icmp is initially undominated by any dbg.value and thus
119 ; shouldn't get a variable location, the first iteration is peeled off into the
120 ; entry block. It's then safe to have it dominated by subsequent dbg.values as
121 ; every path to the icmp is preceeded by a dbg.value.
123 ; FIXME: could we choose to preserve more information about the loop, x and y
124 ; might not be live out of the loop, but they might still be dominated by a
127 define i32 @tak2(i32 %x, i32 %y, i32 %z) nounwind ssp !dbg !21 {
128 ; CHECK-LABEL: define i32 @tak2(
130 ; CHECK-NEXT: %z.tr4 = phi i32
131 ; CHECK-NEXT: %y.tr3 = phi i32
132 ; CHECK-NEXT: %x.tr2 = phi i32
133 ; CHECK-NEXT: #dbg_value(i32 %x.tr2
134 ; CHECK-NEXT: #dbg_value(i32 %y.tr3
135 ; CHECK-NEXT: #dbg_value(i32 %z.tr4
136 ; CHECK: tail call i32 @tak(i32
137 ; CHECK: tail call i32 @tak(i32
138 ; CHECK: tail call i32 @tak(i32
140 ; CHECK-NEXT: z.tr.lcssa = phi i32
141 ; CHECK-NEXT: #dbg_value(i32 undef
142 ; CHECK-NEXT: #dbg_value(i32 undef
143 ; CHECK-NEXT: #dbg_value(i32 %z.tr.lcssa
145 br label %tailrecurse
147 tailrecurse: ; preds = %if.then, %entry
148 %x.tr = phi i32 [ %x, %entry ], [ %call, %if.then ]
149 %y.tr = phi i32 [ %y, %entry ], [ %call9, %if.then ]
150 %z.tr = phi i32 [ %z, %entry ], [ %call14, %if.then ]
151 %cmp = icmp slt i32 %y.tr, %x.tr, !dbg !22
152 br i1 %cmp, label %if.then, label %if.end, !dbg !22
154 if.then: ; preds = %tailrecurse
155 tail call void @llvm.dbg.value(metadata i32 %x.tr, metadata !36, metadata !DIExpression()), !dbg !37
156 tail call void @llvm.dbg.value(metadata i32 %y.tr, metadata !38, metadata !DIExpression()), !dbg !39
157 tail call void @llvm.dbg.value(metadata i32 %z.tr, metadata !40, metadata !DIExpression()), !dbg !41
158 %sub = sub nsw i32 %x.tr, 1, !dbg !24
159 %call = tail call i32 @tak(i32 %sub, i32 %y.tr, i32 %z.tr), !dbg !24
160 %sub6 = sub nsw i32 %y.tr, 1, !dbg !24
161 %call9 = tail call i32 @tak(i32 %sub6, i32 %z.tr, i32 %x.tr), !dbg !24
162 %sub11 = sub nsw i32 %z.tr, 1, !dbg !24
163 %call14 = tail call i32 @tak(i32 %sub11, i32 %x.tr, i32 %y.tr), !dbg !24
164 br label %tailrecurse
166 if.end: ; preds = %tailrecurse
167 tail call void @llvm.dbg.value(metadata i32 %x.tr, metadata !36, metadata !DIExpression()), !dbg !37
168 tail call void @llvm.dbg.value(metadata i32 %y.tr, metadata !38, metadata !DIExpression()), !dbg !39
169 tail call void @llvm.dbg.value(metadata i32 %z.tr, metadata !40, metadata !DIExpression()), !dbg !41
170 br label %return, !dbg !26
172 return: ; preds = %if.end
173 ret i32 %z.tr, !dbg !27
176 @channelColumns = external global i64
177 @horzPlane = external global ptr, align 8
179 define void @FindFreeHorzSeg(i64 %startCol, i64 %row, ptr %rowStart) {
180 ; Ensure that the loop increment basic block is rotated into the tail of the
181 ; body, even though it contains a debug intrinsic call.
182 ; CHECK-LABEL: define void @FindFreeHorzSeg(
184 ; CHECK-NEXT: #dbg_value
187 ; CHECK: phi i64 [ %{{[^,]*}}, %{{[^,]*}} ]
188 ; CHECK-NEXT: br label %for.end
195 %i.0 = phi i64 [ %startCol, %entry ], [ %dec, %for.inc ]
196 %cmp = icmp eq i64 %i.0, 0
197 br i1 %cmp, label %for.end, label %for.body
200 %0 = load i64, ptr @channelColumns, align 8
201 %mul = mul i64 %0, %row
202 %add = add i64 %mul, %i.0
203 %1 = load ptr, ptr @horzPlane, align 8
204 %arrayidx = getelementptr inbounds i8, ptr %1, i64 %add
205 %2 = load i8, ptr %arrayidx, align 1
206 %tobool = icmp eq i8 %2, 0
207 br i1 %tobool, label %for.inc, label %for.end
210 %dec = add i64 %i.0, -1
211 tail call void @llvm.dbg.value(metadata i64 %dec, metadata !DILocalVariable(scope: !0), metadata !DIExpression()), !dbg !DILocation(scope: !0)
215 %add1 = add i64 %i.0, 1
216 store i64 %add1, ptr %rowStart, align 8
220 ; Test that dbg.value intrinsincs adjacent to the `icmp slt i32 0, 0` get
221 ; rotated as expected. The icmp is loop-invariant and so gets hoisted to the
222 ; preheader via a different code path. This is more difficult for DbgVariableRecord
223 ; debug-info records to handle, because they have to get detached and moved
224 ; somewhere else during rotation.
225 define void @invariant_hoist() !dbg !70 {
226 ; CHECK-LABEL: define void @invariant_hoist()
228 ; CHECK-NEXT: br label %L0.preheader
229 ; CHECK: L0.preheader:
230 ; CHECK-NEXT: #dbg_value(i32 0,
231 ; CHECK-NEXT: %cmp = icmp slt i32 0, 0,
232 ; CHECK: L1.preheader:
233 ; CHECK-NEXT: %spec.select3 = phi i32
234 ; CHECK-NEXT: %k.02 = phi i32
235 ; CHECK-NEXT: #dbg_value(i32 %k.02,
237 ; CHECK-NEXT: #dbg_value(i32 %spec.select3,
239 br label %L0.preheader, !dbg !77
242 br label %L0, !dbg !77
245 %k.0 = phi i32 [ 0, %L0.preheader ], [ %spec.select, %L0.latch ]
246 call void @llvm.dbg.value(metadata i32 %k.0, metadata !80, metadata !DIExpression()), !dbg !77
247 %cmp = icmp slt i32 0, 0, !dbg !77
248 %inc = zext i1 %cmp to i32, !dbg !77
249 %spec.select = add nsw i32 %k.0, %inc, !dbg !77
250 %tobool3.not = icmp eq i32 %spec.select, 0, !dbg !77
251 br i1 %tobool3.not, label %L0.preheader, label %L1.preheader, !dbg !77
254 %tobool8.not = icmp eq i32 %k.0, 0, !dbg !77
255 br label %L1, !dbg !77
258 br i1 %tobool8.not, label %L1.latch, label %L0.latch, !dbg !77
261 br i1 false, label %L1, label %L0.latch, !dbg !77
264 br label %L0, !dbg !77
267 !llvm.module.flags = !{!20}
270 !0 = distinct !DISubprogram(name: "tak", line: 32, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !18, scope: !1, type: !3)
271 !1 = !DIFile(filename: "/Volumes/Lalgate/cj/llvm/projects/llvm-test/SingleSource/Benchmarks/BenchmarkGame/recursive.c", directory: "/Volumes/Lalgate/cj/D/projects/llvm-test/SingleSource/Benchmarks/BenchmarkGame")
272 !2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 2.9 (trunk 125492)", isOptimized: true, emissionKind: FullDebug, file: !18)
273 !3 = !DISubroutineType(types: !4)
275 !5 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
276 !6 = !DILocalVariable(name: "x", line: 32, arg: 1, scope: !0, file: !1, type: !5)
277 !7 = !DILocation(line: 32, column: 13, scope: !0)
278 !8 = !DILocalVariable(name: "y", line: 32, arg: 2, scope: !0, file: !1, type: !5)
279 !9 = !DILocation(line: 32, column: 20, scope: !0)
280 !10 = !DILocalVariable(name: "z", line: 32, arg: 3, scope: !0, file: !1, type: !5)
281 !11 = !DILocation(line: 32, column: 27, scope: !0)
282 !12 = !DILocation(line: 33, column: 3, scope: !13)
283 !13 = distinct !DILexicalBlock(line: 32, column: 30, file: !18, scope: !0)
284 !14 = !DILocation(line: 34, column: 5, scope: !15)
285 !15 = distinct !DILexicalBlock(line: 33, column: 14, file: !18, scope: !13)
286 !16 = !DILocation(line: 36, column: 3, scope: !13)
287 !17 = !DILocation(line: 37, column: 1, scope: !13)
288 !18 = !DIFile(filename: "/Volumes/Lalgate/cj/llvm/projects/llvm-test/SingleSource/Benchmarks/BenchmarkGame/recursive.c", directory: "/Volumes/Lalgate/cj/D/projects/llvm-test/SingleSource/Benchmarks/BenchmarkGame")
289 !20 = !{i32 1, !"Debug Info Version", i32 3}
290 !21 = distinct !DISubprogram(name: "tak", line: 32, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !18, scope: !1, type: !3)
291 !22 = !DILocation(line: 33, column: 3, scope: !23)
292 !23 = distinct !DILexicalBlock(line: 32, column: 30, file: !18, scope: !21)
293 !24 = !DILocation(line: 34, column: 5, scope: !25)
294 !25 = distinct !DILexicalBlock(line: 33, column: 14, file: !18, scope: !23)
295 !26 = !DILocation(line: 36, column: 3, scope: !23)
296 !27 = !DILocation(line: 37, column: 1, scope: !23)
297 !36 = !DILocalVariable(name: "x", line: 32, arg: 1, scope: !21, file: !1, type: !5)
298 !37 = !DILocation(line: 32, column: 13, scope: !21)
299 !38 = !DILocalVariable(name: "y", line: 32, arg: 2, scope: !21, file: !1, type: !5)
300 !39 = !DILocation(line: 32, column: 20, scope: !21)
301 !40 = !DILocalVariable(name: "z", line: 32, arg: 3, scope: !21, file: !1, type: !5)
302 !41 = !DILocation(line: 32, column: 27, scope: !21)
303 !50 = distinct !DISubprogram(name: "tak_dup", line: 32, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !18, scope: !1, type: !3)
304 !57 = !DILocation(line: 32, column: 13, scope: !50)
305 !59 = !DILocation(line: 32, column: 20, scope: !50)
306 !60 = !DILocalVariable(name: "z", line: 32, arg: 3, scope: !50, file: !1, type: !5)
307 !61 = !DILocation(line: 32, column: 27, scope: !50)
308 !62 = !DILocation(line: 33, column: 3, scope: !63)
309 !63 = distinct !DILexicalBlock(line: 32, column: 30, file: !18, scope: !50)
310 !64 = !DILocation(line: 34, column: 5, scope: !65)
311 !65 = distinct !DILexicalBlock(line: 33, column: 14, file: !18, scope: !63)
312 !66 = !DILocation(line: 36, column: 3, scope: !63)
313 !67 = !DILocation(line: 37, column: 1, scope: !63)
314 !70 = distinct !DISubprogram(name: "invariant_hoist", line: 32, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !2, file: !18, scope: !1, type: !3)
315 !77 = !DILocation(line: 32, column: 13, scope: !70)
316 !79 = !DILocation(line: 32, column: 20, scope: !70)
317 !80 = !DILocalVariable(name: "z", line: 32, arg: 3, scope: !70, file: !1, type: !5)
318 !81 = !DILocation(line: 32, column: 27, scope: !70)
319 !82 = !DILocation(line: 33, column: 3, scope: !83)
320 !83 = distinct !DILexicalBlock(line: 32, column: 30, file: !18, scope: !70)
321 !84 = !DILocation(line: 34, column: 5, scope: !85)
322 !85 = distinct !DILexicalBlock(line: 33, column: 14, file: !18, scope: !83)
323 !86 = !DILocation(line: 36, column: 3, scope: !83)
324 !87 = !DILocation(line: 37, column: 1, scope: !83)