| # RUN: llc %s -o - -run-pass=livedebugvalues -mtriple=x86_64-unknown-unknown | FileCheck %s |
| # |
| # In this lightly modified test case, the transfer in the entry block from |
| # geti32's return value in $eax to the non-volatile $ebx should be recognized, |
| # and propagated throughout the whole function. |
| # |
| # CHECK-LABEL: bb.0.entry |
| # CHECK: DBG_VALUE $eax |
| # CHECK: DBG_VALUE $ebx |
| # CHECK-LABEL: bb.1.loop2 |
| # CHECK: DBG_VALUE $ebx |
| # CHECK-LABEL: bb.2.loop |
| # CHECK: DBG_VALUE $ebx |
| # CHECK-LABEL: bb.3.exit |
| # CHECK: DBG_VALUE $ebx |
| --- | |
| ; ModuleID = 'asdf' |
| source_filename = "asdf.ll" |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-unknown" |
| |
| @glob = global i32 0 |
| |
| declare i1 @booler() |
| |
| declare i32 @geti32() |
| |
| declare void @escape(i32) |
| |
| ; Function Attrs: nounwind readnone speculatable willreturn |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| define i32 @foo() !dbg !4 { |
| entry: |
| %bar = call i32 @geti32(), !dbg !10 |
| call void @llvm.dbg.value(metadata i32 %bar, metadata !9, metadata !DIExpression()), !dbg !10 |
| br label %loop |
| |
| loop: ; preds = %loop2, %entry |
| call void @escape(i32 %bar) |
| %retval = call i1 @booler(), !dbg !10 |
| br i1 %retval, label %loop2, label %exit |
| |
| loop2: ; preds = %loop |
| store i32 %bar, i32* @glob |
| br label %loop |
| |
| exit: ; preds = %loop |
| ret i32 %bar |
| } |
| |
| ; Function Attrs: nounwind |
| declare void @llvm.stackprotector(i8*, i8**) |
| |
| !llvm.module.flags = !{!0, !1} |
| !llvm.dbg.cu = !{!2} |
| |
| !0 = !{i32 2, !"Debug Info Version", i32 3} |
| !1 = !{i32 2, !"Dwarf Version", i32 4} |
| !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "beards", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug) |
| !3 = !DIFile(filename: "bees.cpp", directory: ".") |
| !4 = distinct !DISubprogram(name: "nope", scope: !3, file: !3, line: 1, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8) |
| !5 = !DISubroutineType(types: !6) |
| !6 = !{!7} |
| !7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) |
| !8 = !{!9} |
| !9 = !DILocalVariable(name: "toast", scope: !4, file: !3, line: 1, type: !7) |
| !10 = !DILocation(line: 1, scope: !4) |
| |
| ... |
| --- |
| name: foo |
| tracksRegLiveness: true |
| frameInfo: |
| stackSize: 8 |
| offsetAdjustment: -8 |
| adjustsStack: true |
| hasCalls: true |
| cvBytesOfCalleeSavedRegisters: 8 |
| fixedStack: |
| - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default, |
| callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '', |
| debug-info-expression: '', debug-info-location: '' } |
| stack: [] |
| body: | |
| bb.0.entry: |
| successors: %bb.1(0x80000000) |
| liveins: $rbx |
| |
| frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !10 |
| CFI_INSTRUCTION def_cfa_offset 16 |
| CFI_INSTRUCTION offset $rbx, -16 |
| CALL64pcrel32 @geti32, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !10 |
| DBG_VALUE $eax, $noreg, !9, !DIExpression(), debug-location !10 |
| $ebx = MOV32rr killed $eax, debug-location !10 |
| JMP_1 %bb.1 |
| |
| bb.1.loop2: |
| successors: %bb.2 |
| liveins: $ebx |
| |
| MOV32mr $rip, 1, $noreg, @glob, $noreg, renamable $ebx :: (store 4 into @glob) |
| |
| bb.2.loop: |
| successors: %bb.1, %bb.3 |
| liveins: $ebx |
| |
| $edi = MOV32rr $ebx |
| CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp |
| CALL64pcrel32 @booler, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $al, debug-location !10 |
| TEST8ri killed renamable $al, 1, implicit-def $eflags |
| JCC_1 %bb.1, 5, implicit $eflags |
| |
| bb.3.exit: |
| liveins: $ebx |
| |
| $eax = MOV32rr killed $ebx |
| $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp |
| CFI_INSTRUCTION def_cfa_offset 8 |
| RETQ $eax |
| |
| ... |