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=CHECK 4# 5# Test that, in a scenario where tail duplication has duplicated DBG_PHI 6# instructions, we can reconstruct the value to refer to. This includes cases 7# where the DBG_PHIs refer to the same value, to values that later merge, and 8# 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 !13 18 call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13 19 call void @ext(i64 %bar), !dbg !15 20 %add = add nsw i64 %bar, 12, !dbg !16 21 call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13 22 call void @ext(i64 %add), !dbg !17 23 %add1 = add nsw i64 %baz, 1, !dbg !18 24 call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !13 25 %call = call i64 @getlong(), !dbg !19 26 %tobool = icmp ne i64 %call, 0, !dbg !19 27 br i1 %tobool, label %if.then, label %if.else, !dbg !21 28 29 if.then: ; preds = %entry 30 %add2 = add nsw i64 %add, 1, !dbg !22 31 call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13 32 br label %if.end, !dbg !24 33 34 if.else: ; preds = %entry 35 %add3 = add nsw i64 %add, 2, !dbg !25 36 call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !13 37 br label %if.end 38 39 if.end: ; preds = %if.else, %if.then 40 %bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !27 41 call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 42 %add4 = add nsw i64 %bar.addr.0, %add1, !dbg !28 43 call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !13 44 call void @ext(i64 %add4), !dbg !29 45 %conv = trunc i64 %add4 to i32, !dbg !30 46 ret i32 %conv, !dbg !31 47 } 48 49 ; Function Attrs: nounwind readnone speculatable willreturn 50 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 willreturn 57 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: foo 99alignment: 16 100tracksRegLiveness: true 101debugInstrRef: true 102liveins: 103 - { reg: '$rdi' } 104 - { reg: '$rsi' } 105frameInfo: 106 stackSize: 24 107 offsetAdjustment: -24 108 maxAlignment: 1 109 adjustsStack: true 110 hasCalls: true 111 maxCallFrameSize: 0 112 cvBytesOfCalleeSavedRegisters: 16 113fixedStack: 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.1 120 liveins: $rdi, $rsi, $r14, $rbx 121 122 frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp 123 CFI_INSTRUCTION def_cfa_offset 16 124 frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp 125 CFI_INSTRUCTION def_cfa_offset 24 126 frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp 127 CFI_INSTRUCTION def_cfa_offset 32 128 CFI_INSTRUCTION offset $rbx, -24 129 CFI_INSTRUCTION offset $r14, -16 130 $r14 = MOV64rr $rsi 131 $rbx = MOV64rr $rdi 132 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15 133 renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16 134 $rdi = MOV64rr $rbx, debug-location !17 135 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17 136 renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18 137 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19 138 CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19 139 JCC_1 %bb.1, 5, implicit $eflags, debug-location !21 140 141 bb.2.if.else: 142 liveins: $rbx, $r14, $rax 143 144 renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25 145 DBG_PHI $r14, 1 146 DBG_PHI $rbx, 2 147 DBG_PHI $rax, 3 148 $rax = MOV64ri 0 149 JMP_1 %bb.3 150 151 bb.1.if.then: 152 liveins: $rbx, $r14, $rax 153 154 renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22 155 DBG_PHI $r14, 1 156 DBG_PHI $rbx, 2 157 DBG_PHI $rax, 3 158 159 bb.3.if.end: 160 liveins: $rbx, $r14 161 162 DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13 163 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13 164 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13 165 166 ; Value number 1 is live-through the above control flow from the two 167 ; DBG_PHIs: 168 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0) 169 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $r14 170 ; 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 {{.+}} $rbx 175 ; 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 a 178 ; DBG_VALUE $noreg. 179 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0) 180 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg 181 182 renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28 183 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13 184 185 ; 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 {{.+}} $noreg 188 189 $rdi = MOV64rr $rbx, debug-location !29 190 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29 191 $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31 192 $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31 193 CFI_INSTRUCTION def_cfa_offset 24, debug-location !31 194 $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 195 CFI_INSTRUCTION def_cfa_offset 16, debug-location !31 196 $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 197 CFI_INSTRUCTION def_cfa_offset 8, debug-location !31 198 RET64 implicit $eax, debug-location !31 199 200... 201