1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ 2# RUN: -experimental-debug-variable-locations \ 3# RUN: -run-pass=phi-node-elimination,register-coalescer \ 4# RUN: | FileCheck %s --check-prefix=DOESCOALESCE 5# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ 6# RUN: -experimental-debug-variable-locations \ 7# RUN: -run-pass=phi-node-elimination,register-coalescer,livedebugvars,greedy,virtregrewriter \ 8# RUN: | FileCheck %s --check-prefix=CHECK 9# 10# Test that a PHI with a debug instruction number attached survives register 11# coalescing, when its vreg gets coalesced. This test comes in two parts, first 12# that coalescing actually happens, second that a DBG_PHI is still produced 13# afterwards. 14# 15# Original C code, the PHI is of the value of 'bar' after the control flow. 16# Compiled at -O0, applied -mem2reg, llc -O0, then manually added the PHI 17# instruction label. Additional variable locations removed. 18# 19# void ext(long); 20# long getlong(void); 21# int foo(long bar, long baz) { 22# ext(bar); 23# bar += 12; 24# ext(bar); 25# 26# if (getlong()) 27# bar += 1; 28# 29# bar += baz; 30# ext(bar); 31# return bar; 32# } 33# 34--- | 35 ; ModuleID = 'promoted.ll' 36 source_filename = "test.c" 37 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 38 target triple = "x86_64-unknown-linux-gnu" 39 40 define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 { 41 entry: 42 call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13 43 call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13 44 call void @ext(i64 %bar), !dbg !13 45 %add = add nsw i64 %bar, 12, !dbg !13 46 call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13 47 call void @ext(i64 %add), !dbg !13 48 %call = call i64 @getlong(), !dbg !13 49 %tobool = icmp ne i64 %call, 0, !dbg !13 50 br i1 %tobool, label %if.then, label %if.end, !dbg !13 51 52 if.then: ; preds = %entry 53 %add1 = add nsw i64 %add, 1, !dbg !13 54 call void @llvm.dbg.value(metadata i64 %add1, metadata !12, metadata !DIExpression()), !dbg !13 55 br label %if.end, !dbg !13 56 57 if.end: ; preds = %if.then, %entry 58 %bar.addr.0 = phi i64 [ %add1, %if.then ], [ %add, %entry ], !dbg !13 59 call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 60 %add2 = add nsw i64 %bar.addr.0, %baz, !dbg !13 61 call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13 62 call void @ext(i64 %add2), !dbg !13 63 %conv = trunc i64 %add2 to i32, !dbg !13 64 ret i32 %conv, !dbg !13 65 } 66 67 ; Function Attrs: nounwind readnone speculatable willreturn 68 declare void @llvm.dbg.declare(metadata, metadata, metadata) 69 70 declare dso_local void @ext(i64) 71 72 declare dso_local i64 @getlong() 73 74 ; Function Attrs: nounwind readnone speculatable willreturn 75 declare void @llvm.dbg.value(metadata, metadata, metadata) 76 77 !llvm.dbg.cu = !{!0} 78 !llvm.module.flags = !{!3, !4, !5} 79 !llvm.ident = !{!6} 80 81 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 82 !1 = !DIFile(filename: "test.c", directory: "/tmp/out.c") 83 !2 = !{} 84 !3 = !{i32 7, !"Dwarf Version", i32 4} 85 !4 = !{i32 2, !"Debug Info Version", i32 3} 86 !5 = !{i32 1, !"wchar_size", i32 4} 87 !6 = !{!""} 88 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 89 !8 = !DISubroutineType(types: !9) 90 !9 = !{!10, !11, !11} 91 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 92 !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 93 !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) 94 !13 = !DILocation(line: 0, scope: !7) 95 !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) 96 !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7) 97 98... 99--- 100name: foo 101alignment: 16 102tracksRegLiveness: true 103debugInstrRef: true 104liveins: 105 - { reg: '$rdi', virtual-reg: '%3' } 106 - { reg: '$rsi', virtual-reg: '%5' } 107frameInfo: 108 maxAlignment: 1 109 adjustsStack: true 110 hasCalls: true 111machineFunctionInfo: {} 112body: | 113 bb.0.entry: 114 liveins: $rdi, $rsi 115 116 %5:gr64 = COPY $rsi 117 %3:gr64 = COPY $rdi 118 %4:gr64 = COPY killed %3 119 %6:gr64 = COPY killed %5 120 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 121 $rdi = COPY %4, debug-location !13 122 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 123 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 124 %9:gr64 = ADD64ri32 %4, 12, implicit-def $eflags, debug-location !13 125 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 126 $rdi = COPY %9, debug-location !13 127 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 128 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 129 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 130 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !13 131 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 132 %8:gr64 = COPY $rax, debug-location !13 133 CMP64ri8 %8, 0, implicit-def $eflags, debug-location !13 134 JCC_1 %bb.2, 4, implicit $eflags, debug-location !13 135 136 ; DOESCOALESCE-LABEL: bb.1.if.then: 137 ; CHECK-LABEL: bb.1.if.then: 138 bb.1.if.then: 139 %10:gr64 = ADD64ri32 %9, 1, implicit-def $eflags, debug-location !13 140 141 ; Verify that the vreg is different immediately after register coalescing. 142 ; DOESCOALESCE-NOT: %10:gr64 ADD64ri32 143 ; DOESCOALESCE: %{{[0-9]+}}:gr64_with_sub_8bit = ADD64ri32 144 ; Verify that all these registers land in r14. 145 ; CHECK: renamable $r14 = ADD64ri32 killed renamable $r14 146 147 ; DOESCOALESCE-LABEL: bb.2.if.end: 148 ; CHECK-LABEL: bb.2.if.end: 149 bb.2.if.end: 150 %2:gr64 = PHI %9, %bb.0, %10, %bb.1, debug-instr-number 1, debug-location !13 151 ; CHECK: DBG_PHI $r14, 1 152 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13 153 %2:gr64 = ADD64rr killed %2, %6, implicit-def $eflags, debug-location !13 154 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 155 $rdi = COPY %2, debug-location !13 156 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !13 157 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13 158 %13:gr32 = COPY %2.sub_32bit, debug-location !13 159 $eax = COPY %13, debug-location !13 160 RET64 implicit $eax, debug-location !13 161 162... 163