| # RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ |
| # RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues \ |
| # RUN: | FileCheck %s --check-prefix=CHECK |
| # |
| # Test that, in a scenario where tail duplication has duplicated DBG_PHI |
| # instructions, we can reconstruct the value to refer to. This includes cases |
| # where the DBG_PHIs refer to the same value, to values that later merge, and |
| # value that become unavailable. |
| --- | |
| ; ModuleID = 'before.mir' |
| source_filename = "test.c" |
| target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 { |
| entry: |
| call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13 |
| call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13 |
| call void @ext(i64 %bar), !dbg !15 |
| %add = add nsw i64 %bar, 12, !dbg !16 |
| call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13 |
| call void @ext(i64 %add), !dbg !17 |
| %add1 = add nsw i64 %baz, 1, !dbg !18 |
| call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !13 |
| %call = call i64 @getlong(), !dbg !19 |
| %tobool = icmp ne i64 %call, 0, !dbg !19 |
| br i1 %tobool, label %if.then, label %if.else, !dbg !21 |
| |
| if.then: ; preds = %entry |
| %add2 = add nsw i64 %add, 1, !dbg !22 |
| call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13 |
| br label %if.end, !dbg !24 |
| |
| if.else: ; preds = %entry |
| %add3 = add nsw i64 %add, 2, !dbg !25 |
| call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !13 |
| br label %if.end |
| |
| if.end: ; preds = %if.else, %if.then |
| %bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !27 |
| call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 |
| %add4 = add nsw i64 %bar.addr.0, %add1, !dbg !28 |
| call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !13 |
| call void @ext(i64 %add4), !dbg !29 |
| %conv = trunc i64 %add4 to i32, !dbg !30 |
| ret i32 %conv, !dbg !31 |
| } |
| |
| ; Function Attrs: nounwind readnone speculatable willreturn |
| declare void @llvm.dbg.declare(metadata, metadata, metadata) |
| |
| declare dso_local void @ext(i64) |
| |
| declare dso_local i64 @getlong() |
| |
| ; Function Attrs: nounwind readnone speculatable willreturn |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!3, !4, !5} |
| !llvm.ident = !{!6} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) |
| !1 = !DIFile(filename: "test.c", directory: ".") |
| !2 = !{} |
| !3 = !{i32 7, !"Dwarf Version", i32 4} |
| !4 = !{i32 2, !"Debug Info Version", i32 3} |
| !5 = !{i32 1, !"wchar_size", i32 4} |
| !6 = !{!"clang"} |
| !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) |
| !8 = !DISubroutineType(types: !9) |
| !9 = !{!10, !11, !11} |
| !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) |
| !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) |
| !13 = !DILocation(line: 0, scope: !7) |
| !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) |
| !15 = !DILocation(line: 4, column: 3, scope: !7) |
| !16 = !DILocation(line: 5, column: 7, scope: !7) |
| !17 = !DILocation(line: 6, column: 3, scope: !7) |
| !18 = !DILocation(line: 7, column: 7, scope: !7) |
| !19 = !DILocation(line: 9, column: 7, scope: !20) |
| !20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7) |
| !21 = !DILocation(line: 9, column: 7, scope: !7) |
| !22 = !DILocation(line: 10, column: 9, scope: !23) |
| !23 = distinct !DILexicalBlock(scope: !20, file: !1, line: 9, column: 18) |
| !24 = !DILocation(line: 11, column: 3, scope: !23) |
| !25 = !DILocation(line: 12, column: 9, scope: !26) |
| !26 = distinct !DILexicalBlock(scope: !20, file: !1, line: 11, column: 10) |
| !27 = !DILocation(line: 0, scope: !20) |
| !28 = !DILocation(line: 15, column: 7, scope: !7) |
| !29 = !DILocation(line: 16, column: 3, scope: !7) |
| !30 = !DILocation(line: 17, column: 10, scope: !7) |
| !31 = !DILocation(line: 17, column: 3, scope: !7) |
| |
| ... |
| --- |
| name: foo |
| alignment: 16 |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi' } |
| - { reg: '$rsi' } |
| frameInfo: |
| stackSize: 24 |
| offsetAdjustment: -24 |
| maxAlignment: 1 |
| adjustsStack: true |
| hasCalls: true |
| maxCallFrameSize: 0 |
| cvBytesOfCalleeSavedRegisters: 16 |
| fixedStack: |
| - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' } |
| - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' } |
| machineFunctionInfo: {} |
| body: | |
| bb.0.entry: |
| successors: %bb.2, %bb.1 |
| liveins: $rdi, $rsi, $r14, $rbx |
| |
| frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 16 |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 24 |
| frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 32 |
| CFI_INSTRUCTION offset $rbx, -24 |
| CFI_INSTRUCTION offset $r14, -16 |
| $r14 = MOV64rr $rsi |
| $rbx = MOV64rr $rdi |
| CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15 |
| renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16 |
| $rdi = MOV64rr $rbx, debug-location !17 |
| CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17 |
| renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18 |
| CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19 |
| CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19 |
| JCC_1 %bb.1, 5, implicit $eflags, debug-location !21 |
| |
| bb.2.if.else: |
| liveins: $rbx, $r14, $rax |
| |
| renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25 |
| DBG_PHI $r14, 1 |
| DBG_PHI $rbx, 2 |
| DBG_PHI $rax, 3 |
| $rax = MOV64ri 0 |
| JMP_1 %bb.3 |
| |
| bb.1.if.then: |
| liveins: $rbx, $r14, $rax |
| |
| renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22 |
| DBG_PHI $r14, 1 |
| DBG_PHI $rbx, 2 |
| DBG_PHI $rax, 3 |
| |
| bb.3.if.end: |
| liveins: $rbx, $r14 |
| |
| DBG_INSTR_REF 1, 0, !14, !DIExpression(), debug-location !13 |
| DBG_INSTR_REF 2, 0, !12, !DIExpression(), debug-location !13 |
| DBG_INSTR_REF 3, 0, !12, !DIExpression(), debug-location !13 |
| |
| ; Value number 1 is live-through the above control flow from the two |
| ; DBG_PHIs: |
| ; CHECK: DBG_INSTR_REF 1, 0 |
| ; CHECK-NEXT: DBG_VALUE $r14 |
| ; |
| ; While value number 2 has different defs that merge on entry to bb.3. |
| ; These are both in $rbx though, and we should find its location: |
| ; CHECK: DBG_INSTR_REF 2, 0 |
| ; CHECK-NEXT: DBG_VALUE $rbx |
| ; |
| ; Value number 3 cannot be resolved because $rax is clobbered in bb.2, |
| ; meaning the merged value in bb.3 is incorrect. It should produce a |
| ; DBG_VALUE $noreg. |
| ; CHECK: DBG_INSTR_REF 3, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28 |
| DBG_INSTR_REF 2, 0, !12, !DIExpression(), debug-location !13 |
| |
| ; After clobbering rbx, the variable location should not be available. |
| ; CHECK: DBG_INSTR_REF 2, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| $rdi = MOV64rr $rbx, debug-location !29 |
| CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29 |
| $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31 |
| $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31 |
| CFI_INSTRUCTION def_cfa_offset 24, debug-location !31 |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 |
| CFI_INSTRUCTION def_cfa_offset 16, debug-location !31 |
| $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 |
| CFI_INSTRUCTION def_cfa_offset 8, debug-location !31 |
| RET64 implicit $eax, debug-location !31 |
| |
| ... |
