1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ 2# RUN: -experimental-debug-variable-locations \ 3# RUN: -run-pass=phi-node-elimination,livedebugvars,greedy,virtregrewriter \ 4# RUN: | FileCheck %s 5# 6# This test checks that for a very simple PHI, we produce a corresponding 7# DBG_PHI instruction, that a DBG_INSTR_REF refers to. Tests the path through 8# phi-node-elimination, live debug variables, and then placement after register 9# allocation. 10# 11# Original code, compiled with only -mem2reg, then fed to llc -stop-before... 12# 13# int ext(int); 14# int foo(int bar, int baz) { 15# int either = 0; 16# if (ext(0)) 17# either = bar; 18# else 19# either = baz; 20# 21# return either; 22# } 23# 24 25--- | 26 ; ModuleID = 'promoted.ll' 27 source_filename = "test.c" 28 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 29 target triple = "x86_64-unknown-linux-gnu" 30 31 define dso_local i32 @foo(i32 %bar, i32 %baz) !dbg !7 { 32 entry: 33 call void @llvm.dbg.value(metadata i32 %bar, metadata !11, metadata !DIExpression()), !dbg !12 34 call void @llvm.dbg.value(metadata i32 %baz, metadata !13, metadata !DIExpression()), !dbg !12 35 call void @llvm.dbg.value(metadata i32 0, metadata !14, metadata !DIExpression()), !dbg !12 36 %call = call i32 @ext(i32 0), !dbg !15 37 %tobool = icmp ne i32 %call, 0, !dbg !15 38 br i1 %tobool, label %if.end, label %if.else, !dbg !17 39 40 if.else: ; preds = %entry 41 call void @llvm.dbg.value(metadata i32 %baz, metadata !14, metadata !DIExpression()), !dbg !12 42 br label %if.end 43 44 if.end: ; preds = %entry, %if.else 45 %either.0 = phi i32 [ %baz, %if.else ], [ %bar, %entry ], !dbg !18 46 call void @llvm.dbg.value(metadata i32 %either.0, metadata !14, metadata !DIExpression()), !dbg !12 47 ret i32 %either.0, !dbg !19 48 } 49 50 declare dso_local i32 @ext(i32) 51 52 ; Function Attrs: nounwind readnone speculatable willreturn 53 declare void @llvm.dbg.value(metadata, metadata, metadata) 54 55 !llvm.dbg.cu = !{!0} 56 !llvm.module.flags = !{!3, !4, !5} 57 !llvm.ident = !{!6} 58 59 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 60 !1 = !DIFile(filename: "test.c", directory: ".") 61 !2 = !{} 62 !3 = !{i32 7, !"Dwarf Version", i32 4} 63 !4 = !{i32 2, !"Debug Info Version", i32 3} 64 !5 = !{i32 1, !"wchar_size", i32 4} 65 !6 = !{!"."} 66 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 67 !8 = !DISubroutineType(types: !9) 68 !9 = !{!10, !10, !10} 69 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 70 !11 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 2, type: !10) 71 !12 = !DILocation(line: 0, scope: !7) 72 !13 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 2, type: !10) 73 !14 = !DILocalVariable(name: "either", scope: !7, file: !1, line: 3, type: !10) 74 !15 = !DILocation(line: 4, column: 7, scope: !16) 75 !16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 7) 76 !17 = !DILocation(line: 4, column: 7, scope: !7) 77 !18 = !DILocation(line: 0, scope: !16) 78 !19 = !DILocation(line: 9, column: 3, scope: !7) 79 80... 81--- 82name: foo 83alignment: 16 84tracksRegLiveness: true 85debugInstrRef: true 86registers: 87 - { id: 0, class: gr32 } 88 - { id: 1, class: gr32 } 89 - { id: 2, class: gr32 } 90 - { id: 3, class: gr32 } 91 - { id: 4, class: gr32 } 92liveins: 93 - { reg: '$edi', virtual-reg: '%1' } 94 - { reg: '$esi', virtual-reg: '%2' } 95frameInfo: 96 maxAlignment: 1 97 adjustsStack: true 98 hasCalls: true 99machineFunctionInfo: {} 100body: | 101 bb.0.entry: 102 successors: %bb.2(0x50000000), %bb.1(0x30000000) 103 liveins: $edi, $esi 104 105 DBG_VALUE $edi, $noreg, !11, !DIExpression(), debug-location !12 106 DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !12 107 %2:gr32 = COPY killed $esi 108 %1:gr32 = COPY killed $edi 109 DBG_VALUE 0, $noreg, !14, !DIExpression(), debug-location !12 110 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 111 %3:gr32 = MOV32r0 implicit-def dead $eflags 112 $edi = COPY killed %3, debug-location !15 113 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15 114 ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !15 115 %4:gr32 = COPY killed $eax, debug-location !15 116 TEST32rr killed %4, %4, implicit-def $eflags, debug-location !15 117 JCC_1 %bb.2, 5, implicit killed $eflags, debug-location !17 118 JMP_1 %bb.1, debug-location !17 119 120 bb.1.if.else: 121 122 ; CHECK-LABEL: bb.2.if.end: 123 bb.2.if.end: 124 %0:gr32 = PHI %1, %bb.0, %2, %bb.1, debug-instr-number 1, debug-location !18 125 DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !12 126 ; CHECK: DBG_PHI $ebp, 1 127 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0) 128 $eax = COPY killed %0, debug-location !19 129 ; Confirm that %0 is allocated in $ebp, 130 ; CHECK: $eax = COPY killed renamable $ebp 131 RET 0, killed $eax, debug-location !19 132 133... 134