132 lines
5.3 KiB
YAML
132 lines
5.3 KiB
YAML
# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
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# RUN: -experimental-debug-variable-locations \
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# RUN: -run-pass=phi-node-elimination,livedebugvars,greedy,virtregrewriter \
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# RUN: | FileCheck %s
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#
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# This test checks that for a very simple PHI, we produce a corresponding
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# DBG_PHI instruction, that a DBG_INSTR_REF refers to. Tests the path through
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# phi-node-elimination, live debug variables, and then placement after register
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# allocation.
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#
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# Original code, compiled with only -mem2reg, then fed to llc -stop-before...
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#
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# int ext(int);
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# int foo(int bar, int baz) {
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# int either = 0;
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# if (ext(0))
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# either = bar;
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# else
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# either = baz;
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#
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# return either;
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# }
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#
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--- |
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; ModuleID = 'promoted.ll'
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source_filename = "test.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define dso_local i32 @foo(i32 %bar, i32 %baz) !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 %bar, metadata !11, metadata !DIExpression()), !dbg !12
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call void @llvm.dbg.value(metadata i32 %baz, metadata !13, metadata !DIExpression()), !dbg !12
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call void @llvm.dbg.value(metadata i32 0, metadata !14, metadata !DIExpression()), !dbg !12
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%call = call i32 @ext(i32 0), !dbg !15
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%tobool = icmp ne i32 %call, 0, !dbg !15
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br i1 %tobool, label %if.end, label %if.else, !dbg !17
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if.else: ; preds = %entry
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call void @llvm.dbg.value(metadata i32 %baz, metadata !14, metadata !DIExpression()), !dbg !12
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br label %if.end
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if.end: ; preds = %entry, %if.else
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%either.0 = phi i32 [ %baz, %if.else ], [ %bar, %entry ], !dbg !18
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call void @llvm.dbg.value(metadata i32 %either.0, metadata !14, metadata !DIExpression()), !dbg !12
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ret i32 %either.0, !dbg !19
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}
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declare dso_local i32 @ext(i32)
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: ".")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"."}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 2, type: !10)
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!12 = !DILocation(line: 0, scope: !7)
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!13 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 2, type: !10)
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!14 = !DILocalVariable(name: "either", scope: !7, file: !1, line: 3, type: !10)
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!15 = !DILocation(line: 4, column: 7, scope: !16)
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!16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 7)
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!17 = !DILocation(line: 4, column: 7, scope: !7)
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!18 = !DILocation(line: 0, scope: !16)
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!19 = !DILocation(line: 9, column: 3, scope: !7)
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...
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---
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name: foo
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alignment: 16
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr32 }
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- { id: 1, class: gr32 }
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- { id: 2, class: gr32 }
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- { id: 3, class: gr32 }
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- { id: 4, class: gr32 }
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liveins:
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- { reg: '$edi', virtual-reg: '%1' }
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- { reg: '$esi', virtual-reg: '%2' }
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frameInfo:
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maxAlignment: 1
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hasCalls: true
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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successors: %bb.2(0x50000000), %bb.1(0x30000000)
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liveins: $edi, $esi
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DBG_VALUE $edi, $noreg, !11, !DIExpression(), debug-location !12
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DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !12
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%2:gr32 = COPY killed $esi
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%1:gr32 = COPY killed $edi
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DBG_VALUE 0, $noreg, !14, !DIExpression(), debug-location !12
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
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%3:gr32 = MOV32r0 implicit-def dead $eflags
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$edi = COPY killed %3, debug-location !15
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15
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%4:gr32 = COPY killed $eax, debug-location !15
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TEST32rr killed %4, %4, implicit-def $eflags, debug-location !15
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JCC_1 %bb.2, 5, implicit killed $eflags, debug-location !17
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JMP_1 %bb.1, debug-location !17
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bb.1.if.else:
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; CHECK-LABEL: bb.2.if.end:
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bb.2.if.end:
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%0:gr32 = PHI %1, %bb.0, %2, %bb.1, debug-instr-number 1, debug-location !18
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DBG_INSTR_REF 1, 0, !14, !DIExpression(), debug-location !12
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; CHECK: DBG_PHI $ebp, 1
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; CHECK: DBG_INSTR_REF 1, 0
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$eax = COPY killed %0, debug-location !19
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; Confirm that %0 is allocated in $ebp,
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; CHECK: $eax = COPY killed renamable $ebp
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RET 0, killed $eax, debug-location !19
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...
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