2 # RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs -run-pass=livedebugvalues %s -o - | FileCheck %s
5 # This test is for the problem from https://bugs.llvm.org/show_bug.cgi?id=38714.
7 # Specifically, Simple Register Coalescing creates following conversion :
9 # undef %0.sub_32:gpr64 = ORRWrs $wzr, %3:gpr32common, 0, debug-location !24;
11 # It copies 32-bit value from gpr32 into gpr64. But later Live DEBUG_VALUE analysis
12 # is not able to create debug location record for that instruction. The fix is
13 # to write custom isCopyInstrImpl() which would recognize the ORRWrs instr as
16 # The LLVM-IR below was produced by clang on the following C++ code:
18 # int printf(const char* restrict format, ...);
21 # int main( int argc, char **argv )
23 # for(int i = 1; i < argc; ++i) {
24 # printf("Argument %d: %s\n", i, argv[i]);
31 # CHECK: DBG_VALUE $w0, $noreg
32 # CHECK: renamable $[[REG1:w[0-9]+]] = ORRWrs $wzr, killed renamable $w0, 0
33 # CHECK: DBG_VALUE $[[REG1]], $noreg
37 ; ModuleID = '<stdin>'
38 source_filename = "test.c"
39 target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
40 target triple = "aarch64-unknown-linux"
42 @.str = private unnamed_addr constant [17 x i8] c"Argument %d: %s\0A\00", align 1
44 ; Function Attrs: nounwind
45 define dso_local i32 @main(i32 %argc, i8** nocapture readonly %argv) local_unnamed_addr #0 !dbg !7 {
47 call void @llvm.dbg.value(metadata i32 %argc, metadata !15, metadata !DIExpression()), !dbg !19
48 call void @llvm.dbg.value(metadata i8** %argv, metadata !16, metadata !DIExpression()), !dbg !19
49 call void @llvm.dbg.value(metadata i32 1, metadata !17, metadata !DIExpression()), !dbg !20
50 %cmp5 = icmp sgt i32 %argc, 1, !dbg !21
51 br i1 %cmp5, label %for.body.preheader, label %for.cond.cleanup, !dbg !23
53 for.body.preheader: ; preds = %entry
54 %wide.trip.count = zext i32 %argc to i64, !dbg !24
55 br label %for.body, !dbg !25
57 for.cond.cleanup: ; preds = %for.body, %entry
60 for.body: ; preds = %for.body, %for.body.preheader
61 %indvars.iv = phi i64 [ 1, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
62 call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !17, metadata !DIExpression()), !dbg !20
63 %scevgep = getelementptr i8*, i8** %argv, i64 %indvars.iv, !dbg !25
64 %0 = load i8*, i8** %scevgep, align 8, !dbg !25, !tbaa !28
65 %tmp = trunc i64 %indvars.iv to i32
66 %call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32 %tmp, i8* %0), !dbg !32
67 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !33
68 call void @llvm.dbg.value(metadata i32 undef, metadata !17, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !20
69 %exitcond = icmp eq i64 %wide.trip.count, %indvars.iv.next, !dbg !21
70 br i1 %exitcond, label %for.cond.cleanup, label %for.body, !dbg !23, !llvm.loop !34
73 ; Function Attrs: nounwind
74 declare dso_local i32 @printf(i8* nocapture readonly, ...) local_unnamed_addr #1
76 ; Function Attrs: nounwind readnone speculatable
77 declare void @llvm.dbg.value(metadata, metadata, metadata) #2
79 ; Function Attrs: nounwind
80 declare void @llvm.stackprotector(i8*, i8**) #3
82 attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
83 attributes #1 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
84 attributes #2 = { nounwind readnone speculatable }
85 attributes #3 = { nounwind }
88 !llvm.module.flags = !{!3, !4, !5}
91 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
92 !1 = !DIFile(filename: "test.c", directory: "test")
94 !3 = !{i32 2, !"Dwarf Version", i32 4}
95 !4 = !{i32 2, !"Debug Info Version", i32 3}
96 !5 = !{i32 1, !"wchar_size", i32 4}
97 !6 = !{!"clang version 9.0.0 "}
98 !7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 6, type: !8, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !14)
99 !8 = !DISubroutineType(types: !9)
100 !9 = !{!10, !10, !11}
101 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
102 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
103 !12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
104 !13 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char)
105 !14 = !{!15, !16, !17}
106 !15 = !DILocalVariable(name: "argc", arg: 1, scope: !7, file: !1, line: 6, type: !10)
107 !16 = !DILocalVariable(name: "argv", arg: 2, scope: !7, file: !1, line: 6, type: !11)
108 !17 = !DILocalVariable(name: "i", scope: !18, file: !1, line: 8, type: !10)
109 !18 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 3)
110 !19 = !DILocation(line: 0, scope: !7)
111 !20 = !DILocation(line: 0, scope: !18)
112 !21 = !DILocation(line: 8, column: 20, scope: !22)
113 !22 = distinct !DILexicalBlock(scope: !18, file: !1, line: 8, column: 3)
114 !23 = !DILocation(line: 8, column: 3, scope: !18)
115 !24 = !DILocation(line: 0, scope: !22)
116 !25 = !DILocation(line: 9, column: 36, scope: !26)
117 !26 = distinct !DILexicalBlock(scope: !22, file: !1, line: 8, column: 33)
118 !27 = !DILocation(line: 11, column: 3, scope: !7)
119 !28 = !{!29, !29, i64 0}
120 !29 = !{!"any pointer", !30, i64 0}
121 !30 = !{!"omnipotent char", !31, i64 0}
122 !31 = !{!"Simple C/C++ TBAA"}
123 !32 = !DILocation(line: 9, column: 5, scope: !26)
124 !33 = !DILocation(line: 8, column: 28, scope: !22)
125 !34 = distinct !{!34, !23, !35}
126 !35 = !DILocation(line: 10, column: 3, scope: !18)
132 exposesReturnsTwice: false
134 regBankSelected: false
137 tracksRegLiveness: true
141 - { reg: '$w0', virtual-reg: '' }
142 - { reg: '$x1', virtual-reg: '' }
144 isFrameAddressTaken: false
145 isReturnAddressTaken: false
155 cvBytesOfCalleeSavedRegisters: 0
156 hasOpaqueSPAdjustment: false
158 hasMustTailInVarArgFunc: false
164 - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
165 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
166 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
167 - { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
168 stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true,
169 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
170 - { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
171 stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
172 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
173 - { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
174 stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
175 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
176 - { id: 4, name: '', type: spill-slot, offset: -40, size: 8, alignment: 8,
177 stack-id: default, callee-saved-register: '$x21', callee-saved-restored: true,
178 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
179 - { id: 5, name: '', type: spill-slot, offset: -48, size: 8, alignment: 8,
180 stack-id: default, callee-saved-register: '$x22', callee-saved-restored: true,
181 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
183 machineFunctionInfo: {}
186 successors: %bb.1(0x40000000), %bb.3(0x40000000)
187 liveins: $w0, $x1, $x21, $x22, $x19, $x20, $lr
189 DBG_VALUE $w0, $noreg, !15, !DIExpression(), debug-location !19
190 DBG_VALUE $w0, $noreg, !15, !DIExpression(), debug-location !19
191 DBG_VALUE $x1, $noreg, !16, !DIExpression(), debug-location !19
192 early-clobber $sp = frame-setup STPXpre killed $x22, killed $x21, $sp, -6 :: (store 8 into %stack.5), (store 8 into %stack.4)
193 frame-setup STPXi killed $x20, killed $x19, $sp, 2 :: (store 8 into %stack.3), (store 8 into %stack.2)
194 frame-setup STPXi $fp, killed $lr, $sp, 4 :: (store 8 into %stack.1), (store 8 into %stack.0)
195 $fp = frame-setup ADDXri $sp, 32, 0
196 frame-setup CFI_INSTRUCTION def_cfa $w29, 16
197 frame-setup CFI_INSTRUCTION offset $w30, -8, debug-location !23
198 frame-setup CFI_INSTRUCTION offset $w29, -16, debug-location !23
199 frame-setup CFI_INSTRUCTION offset $w19, -24, debug-location !23
200 frame-setup CFI_INSTRUCTION offset $w20, -32, debug-location !23
201 frame-setup CFI_INSTRUCTION offset $w21, -40, debug-location !23
202 frame-setup CFI_INSTRUCTION offset $w22, -48, debug-location !23
203 DBG_VALUE 1, $noreg, !17, !DIExpression(), debug-location !20
204 dead $wzr = SUBSWri renamable $w0, 2, 0, implicit-def $nzcv, debug-location !23
205 Bcc 11, %bb.3, implicit $nzcv, debug-location !23
207 bb.1.for.body.preheader:
208 successors: %bb.2(0x80000000)
211 $x21 = ADRP target-flags(aarch64-page) @.str
212 $x19 = ORRXrs $xzr, killed $x1, 0
213 DBG_VALUE $x19, $noreg, !16, !DIExpression(), debug-location !19
214 renamable $w22 = ORRWrs $wzr, killed renamable $w0, 0, implicit-def $x22, debug-location !24
215 $w20 = MOVZWi 1, 0, implicit-def $x20
216 renamable $x21 = ADDXri killed $x21, target-flags(aarch64-pageoff, aarch64-nc) @.str, 0
219 successors: %bb.3(0x04000000), %bb.2(0x7c000000)
220 liveins: $x19, $x20, $x21, $x22
222 DBG_VALUE $x20, $noreg, !17, !DIExpression(), debug-location !20
223 renamable $x2 = LDRXroX renamable $x19, renamable $x20, 0, 1, debug-location !25 :: (load 8 from %ir.scevgep, !tbaa !28)
224 $x0 = ORRXrs $xzr, $x21, 0, debug-location !32
225 $w1 = ORRWrs $wzr, $w20, 0, debug-location !32
226 BL @printf, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $x0, implicit killed $w1, implicit killed $x2, implicit-def $sp, implicit-def dead $w0, debug-location !32
227 renamable $x20 = nuw nsw ADDXri killed renamable $x20, 1, 0, debug-location !33
228 DBG_VALUE $noreg, $noreg, !17, !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value), debug-location !20
229 $xzr = SUBSXrs renamable $x22, renamable $x20, 0, implicit-def $nzcv, implicit-def $nzcv, debug-location !23
230 Bcc 1, %bb.2, implicit killed $nzcv, debug-location !23
232 bb.3.for.cond.cleanup:
233 $fp, $lr = frame-destroy LDPXi $sp, 4, debug-location !27 :: (load 8 from %stack.1), (load 8 from %stack.0)
234 $x20, $x19 = frame-destroy LDPXi $sp, 2, debug-location !27 :: (load 8 from %stack.3), (load 8 from %stack.2)
235 $w0 = ORRWrs $wzr, $wzr, 0, debug-location !27
236 early-clobber $sp, $x22, $x21 = frame-destroy LDPXpost $sp, 6, debug-location !27 :: (load 8 from %stack.5), (load 8 from %stack.4)
237 RET undef $lr, implicit killed $w0, debug-location !27