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1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \2# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues \3# RUN: | FileCheck %s --check-prefix=CHECK4#5# Test that, in a scenario where tail duplication has duplicated DBG_PHI6# instructions, we can reconstruct the value to refer to. This includes cases7# where the DBG_PHIs refer to the same value, to values that later merge, and8# value that become unavailable.9--- |10 ; ModuleID = 'before.mir'11 source_filename = "test.c"12 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"13 target triple = "x86_64-unknown-linux-gnu"14 15 define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {16 entry:17 call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !1318 call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !1319 call void @ext(i64 %bar), !dbg !1520 %add = add nsw i64 %bar, 12, !dbg !1621 call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !1322 call void @ext(i64 %add), !dbg !1723 %add1 = add nsw i64 %baz, 1, !dbg !1824 call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !1325 %call = call i64 @getlong(), !dbg !1926 %tobool = icmp ne i64 %call, 0, !dbg !1927 br i1 %tobool, label %if.then, label %if.else, !dbg !2128 29 if.then: ; preds = %entry30 %add2 = add nsw i64 %add, 1, !dbg !2231 call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !1332 br label %if.end, !dbg !2433 34 if.else: ; preds = %entry35 %add3 = add nsw i64 %add, 2, !dbg !2536 call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !1337 br label %if.end38 39 if.end: ; preds = %if.else, %if.then40 %bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !2741 call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !1342 %add4 = add nsw i64 %bar.addr.0, %add1, !dbg !2843 call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !1344 call void @ext(i64 %add4), !dbg !2945 %conv = trunc i64 %add4 to i32, !dbg !3046 ret i32 %conv, !dbg !3147 }48 49 ; Function Attrs: nounwind readnone speculatable willreturn50 declare void @llvm.dbg.declare(metadata, metadata, metadata)51 52 declare dso_local void @ext(i64)53 54 declare dso_local i64 @getlong()55 56 ; Function Attrs: nounwind readnone speculatable willreturn57 declare void @llvm.dbg.value(metadata, metadata, metadata)58 59 !llvm.dbg.cu = !{!0}60 !llvm.module.flags = !{!3, !4, !5}61 !llvm.ident = !{!6}62 63 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)64 !1 = !DIFile(filename: "test.c", directory: ".")65 !2 = !{}66 !3 = !{i32 7, !"Dwarf Version", i32 4}67 !4 = !{i32 2, !"Debug Info Version", i32 3}68 !5 = !{i32 1, !"wchar_size", i32 4}69 !6 = !{!"clang"}70 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)71 !8 = !DISubroutineType(types: !9)72 !9 = !{!10, !11, !11}73 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)74 !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)75 !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)76 !13 = !DILocation(line: 0, scope: !7)77 !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)78 !15 = !DILocation(line: 4, column: 3, scope: !7)79 !16 = !DILocation(line: 5, column: 7, scope: !7)80 !17 = !DILocation(line: 6, column: 3, scope: !7)81 !18 = !DILocation(line: 7, column: 7, scope: !7)82 !19 = !DILocation(line: 9, column: 7, scope: !20)83 !20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7)84 !21 = !DILocation(line: 9, column: 7, scope: !7)85 !22 = !DILocation(line: 10, column: 9, scope: !23)86 !23 = distinct !DILexicalBlock(scope: !20, file: !1, line: 9, column: 18)87 !24 = !DILocation(line: 11, column: 3, scope: !23)88 !25 = !DILocation(line: 12, column: 9, scope: !26)89 !26 = distinct !DILexicalBlock(scope: !20, file: !1, line: 11, column: 10)90 !27 = !DILocation(line: 0, scope: !20)91 !28 = !DILocation(line: 15, column: 7, scope: !7)92 !29 = !DILocation(line: 16, column: 3, scope: !7)93 !30 = !DILocation(line: 17, column: 10, scope: !7)94 !31 = !DILocation(line: 17, column: 3, scope: !7)95 96...97---98name: foo99alignment: 16100tracksRegLiveness: true101debugInstrRef: true102liveins:103 - { reg: '$rdi' }104 - { reg: '$rsi' }105frameInfo:106 stackSize: 24107 offsetAdjustment: -24108 maxAlignment: 1109 adjustsStack: true110 hasCalls: true111 maxCallFrameSize: 0112 cvBytesOfCalleeSavedRegisters: 16113fixedStack:114 - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }115 - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }116machineFunctionInfo: {}117body: |118 bb.0.entry:119 successors: %bb.2, %bb.1120 liveins: $rdi, $rsi, $r14, $rbx121 122 frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp123 CFI_INSTRUCTION def_cfa_offset 16124 frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp125 CFI_INSTRUCTION def_cfa_offset 24126 frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp127 CFI_INSTRUCTION def_cfa_offset 32128 CFI_INSTRUCTION offset $rbx, -24129 CFI_INSTRUCTION offset $r14, -16130 $r14 = MOV64rr $rsi131 $rbx = MOV64rr $rdi132 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15133 renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16134 $rdi = MOV64rr $rbx, debug-location !17135 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17136 renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18137 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19138 CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19139 JCC_1 %bb.1, 5, implicit $eflags, debug-location !21140 141 bb.2.if.else:142 liveins: $rbx, $r14, $rax143 144 renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25145 DBG_PHI $r14, 1146 DBG_PHI $rbx, 2147 DBG_PHI $rax, 3148 $rax = MOV64ri 0149 JMP_1 %bb.3150 151 bb.1.if.then:152 liveins: $rbx, $r14, $rax153 154 renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22155 DBG_PHI $r14, 1156 DBG_PHI $rbx, 2157 DBG_PHI $rax, 3158 159 bb.3.if.end:160 liveins: $rbx, $r14161 162 DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13163 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13164 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13165 166 ; Value number 1 is live-through the above control flow from the two167 ; DBG_PHIs:168 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)169 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $r14170 ;171 ; While value number 2 has different defs that merge on entry to bb.3.172 ; These are both in $rbx though, and we should find its location:173 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)174 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $rbx175 ;176 ; Value number 3 cannot be resolved because $rax is clobbered in bb.2,177 ; meaning the merged value in bb.3 is incorrect. It should produce a178 ; DBG_VALUE $noreg.179 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0)180 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg181 182 renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28183 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13184 185 ; After clobbering rbx, the variable location should not be available.186 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)187 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg188 189 $rdi = MOV64rr $rbx, debug-location !29190 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29191 $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31192 $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31193 CFI_INSTRUCTION def_cfa_offset 24, debug-location !31194 $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31195 CFI_INSTRUCTION def_cfa_offset 16, debug-location !31196 $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31197 CFI_INSTRUCTION def_cfa_offset 8, debug-location !31198 RET64 implicit $eax, debug-location !31199 200...201