1 2# RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs -run-pass=livedebugvalues %s -o - | FileCheck %s 3 4# 5# This test is for the problem from https://bugs.llvm.org/show_bug.cgi?id=38714. 6# 7# Specifically, Simple Register Coalescing creates following conversion : 8# 9# undef %0.sub_32:gpr64 = ORRWrs $wzr, %3:gpr32common, 0, debug-location !24; 10# 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 14# move instruction. 15# 16# The LLVM-IR below was produced by clang on the following C++ code: 17# 18# int printf(const char* restrict format, ...); 19# 20# 21# int main( int argc, char **argv ) 22# { 23# for(int i = 1; i < argc; ++i) { 24# printf("Argument %d: %s\n", i, argv[i]); 25# } 26# return 0; 27# } 28# 29 30# CHECK-LABEL: main 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 34 35 36--- | 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" 41 42 @.str = private unnamed_addr constant [17 x i8] c"Argument %d: %s\0A\00", align 1 43 44 ; Function Attrs: nounwind 45 define dso_local i32 @main(i32 %argc, i8** nocapture readonly %argv) local_unnamed_addr #0 !dbg !7 { 46 entry: 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 52 53 for.body.preheader: ; preds = %entry 54 %wide.trip.count = zext i32 %argc to i64, !dbg !24 55 br label %for.body, !dbg !25 56 57 for.cond.cleanup: ; preds = %for.body, %entry 58 ret i32 0, !dbg !27 59 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 71 } 72 73 ; Function Attrs: nounwind 74 declare dso_local i32 @printf(i8* nocapture readonly, ...) local_unnamed_addr #1 75 76 ; Function Attrs: nounwind readnone speculatable 77 declare void @llvm.dbg.value(metadata, metadata, metadata) #2 78 79 ; Function Attrs: nounwind 80 declare void @llvm.stackprotector(i8*, i8**) #3 81 82 attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "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" "frame-pointer"="all" "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 } 86 87 !llvm.dbg.cu = !{!0} 88 !llvm.module.flags = !{!3, !4, !5} 89 !llvm.ident = !{!6} 90 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") 93 !2 = !{} 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) 127 128... 129--- 130name: main 131alignment: 4 132exposesReturnsTwice: false 133legalized: false 134regBankSelected: false 135selected: false 136failedISel: false 137tracksRegLiveness: true 138hasWinCFI: false 139registers: [] 140liveins: 141 - { reg: '$w0', virtual-reg: '' } 142 - { reg: '$x1', virtual-reg: '' } 143frameInfo: 144 isFrameAddressTaken: false 145 isReturnAddressTaken: false 146 hasStackMap: false 147 hasPatchPoint: false 148 stackSize: 48 149 offsetAdjustment: 0 150 maxAlignment: 8 151 adjustsStack: true 152 hasCalls: true 153 stackProtector: '' 154 maxCallFrameSize: 0 155 cvBytesOfCalleeSavedRegisters: 0 156 hasOpaqueSPAdjustment: false 157 hasVAStart: false 158 hasMustTailInVarArgFunc: false 159 localFrameSize: 0 160 savePoint: '' 161 restorePoint: '' 162fixedStack: [] 163stack: 164 - { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8, 165 stack-id: default, callee-saved-register: '$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: '' } 182constants: [] 183machineFunctionInfo: {} 184body: | 185 bb.0.entry: 186 successors: %bb.1(0x40000000), %bb.3(0x40000000) 187 liveins: $w0, $x1, $x21, $x22, $x19, $x20, $lr 188 189 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 !23 206 207 bb.1.for.body.preheader: 208 successors: %bb.2(0x80000000) 209 liveins: $w0, $x1 210 211 $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, 0 217 218 bb.2.for.body: 219 successors: %bb.3(0x04000000), %bb.2(0x7c000000) 220 liveins: $x19, $x20, $x21, $x22 221 222 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 !23 231 232 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 !27 238 239... 240