1# RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=machine-sink -o - %s | FileCheck %s 2# In the first test, check various things when we sink machine instructions: 3# a) DBG_VALUEs should sink with defs 4# b) Undefs should be left behind 5# c) DBG_VALUEs not immediately following the defining inst should sink too 6# d) If we generate debug-use-before-defs through sinking, and can copy 7# propagate to a different value, we should do that. 8# 9# Test two checks DBG_VALUEs do not sink past a DBG_VALUE in the same block 10# that redefines the variable location, while three checks that copy-propagation 11# happens in the same scenario. 12--- | 13 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 14 target triple = "x86_64-unknown-linux-gnu" 15 16 @x = common local_unnamed_addr global i32 0, align 4, !dbg !0 17 18 ; Function Attrs: noreturn nounwind uwtable 19 define void @Process(i32* nocapture readonly %p) local_unnamed_addr !dbg !9 { 20 ; Stripped 21 entry: 22 br label %nou 23 nou: 24 br label %exit 25 exit: 26 ret void 27 } 28 29 define void @test2(i32* nocapture readonly %p) local_unnamed_addr !dbg !101 { 30 ; Stripped 31 entry: 32 br label %block1 33 block1: 34 br label %exit 35 exit: 36 ret void 37 } 38 39 define void @test3(i32* nocapture readonly %p) local_unnamed_addr !dbg !201 { 40 ; Stripped 41 entry: 42 br label %block1 43 block1: 44 br label %exit 45 exit: 46 ret void 47 } 48 49 ; Function Attrs: nounwind readnone 50 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) 51 52 !llvm.dbg.cu = !{!1} 53 !llvm.module.flags = !{!6, !7} 54 !llvm.ident = !{!8} 55 56 !0 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true), expr: !DIExpression()) 57 !1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4) 58 !2 = !DIFile(filename: "t.c", directory: "") 59 !3 = !{} 60 !4 = !{!0} 61 !5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 62 !6 = !{i32 2, !"Dwarf Version", i32 4} 63 !7 = !{i32 2, !"Debug Info Version", i32 3} 64 !8 = !{!"clang version 4.0.0 "} 65 !9 = distinct !DISubprogram(name: "Process", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !15) 66 !10 = !DISubroutineType(types: !11) 67 !11 = !{null, !12} 68 !12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64) 69 !13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14) 70 !14 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) 71 !15 = !{!16} 72 !16 = !DILocalVariable(name: "p", arg: 1, scope: !9, file: !2, line: 2, type: !12) 73 !17 = !DIExpression() 74 !18 = !DILocation(line: 2, column: 34, scope: !9) 75 !28 = !DILexicalBlockFile(scope: !9, file: !2, discriminator: 1) 76 !101 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !102) 77 !102 = !{!103} 78 !103 = !DILocalVariable(name: "q", arg: 1, scope: !101, file: !2, line: 2, type: !12) 79 !104 = !DILocation(line: 1, column: 1, scope: !101) 80 !201 = distinct !DISubprogram(name: "test2", scope: !2, file: !2, line: 2, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !1, retainedNodes: !202) 81 !202 = !{!203} 82 !203 = !DILocalVariable(name: "r", arg: 1, scope: !201, file: !2, line: 2, type: !12) 83 !204 = !DILocation(line: 1, column: 1, scope: !201) 84 85 ; CHECK: [[VARNUM:![0-9]+]] = !DILocalVariable(name: "p", 86 ; CHECK: [[VAR2NUM:![0-9]+]] = !DILocalVariable(name: "q", 87 ; CHECK: [[VAR3NUM:![0-9]+]] = !DILocalVariable(name: "r", 88 89... 90--- 91name: Process 92tracksRegLiveness: true 93liveins: 94 - { reg: '$rdi', virtual-reg: '%2' } 95 - { reg: '$rsi', virtual-reg: '%2' } 96body: | 97 bb.0.entry: 98 successors: %bb.1.nou(0x80000000), %bb.2.exit 99 liveins: $rdi, $esi 100 101 ; This block should have the vreg copy sunk from it, the DBG_VALUE with it, 102 ; and a copy-prop'd DBG_VALUE left over. 103 ; CHECK-LABEL: bb.0.entry: 104 ; CHECK: [[ARG0VREG:%[0-9]+]]:gr64 = COPY $rdi 105 ; CHECK-NEXT: CMP32ri $esi, 0 106 ; CHECK-NEXT: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]] 107 ; CHECK-NEXT: JCC_1 %bb.1, 4 108 ; CHECK-NEXT: JMP_1 109 110 %2:gr64 = COPY $rdi 111 %5:gr64 = COPY %2 112 CMP32ri $esi, 0, implicit-def $eflags 113 DBG_VALUE %5, $noreg, !16, !17, debug-location !18 114 JCC_1 %bb.1.nou, 4, implicit $eflags 115 JMP_1 %bb.2.exit 116 117 bb.1.nou: 118 successors: %bb.2.exit(0x80000000) 119 120 ; This block should receive the sunk copy and DBG_VALUE 121 ; CHECK-LABEL: bb.1.nou: 122 ; CHECK: [[SUNKVREG:%[0-9]+]]:gr64 = COPY [[ARG0VREG]] 123 ; CHECK-NEXT: DBG_VALUE [[SUNKVREG]], $noreg, [[VARNUM]] 124 ; CHECK-NEXT: ADD64ri8 125 ; CHECK-NEXT: JMP_1 126 %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags 127 JMP_1 %bb.2.exit 128 129 bb.2.exit: 130 ; The DBG_VALUE below should have its operand copy-propagated after 131 ; the copy to %5 is sunk. 132 ; CHECK-LABEL: bb.2.exit: 133 ; CHECK: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]] 134 ; CHECK-NEXT: $rax = MOV64rr [[ARG0VREG]] 135 ; CHECK-NEXT: RET 0 136 DBG_VALUE %5, _, !16, !17, debug-location !18 137 $rax = MOV64rr %2 138 RET 0 139... 140--- 141name: test2 142tracksRegLiveness: true 143liveins: 144 - { reg: '$rdi', virtual-reg: '%2' } 145 - { reg: '$rsi', virtual-reg: '%2' } 146body: | 147 bb.0.entry: 148 successors: %bb.1.block1, %bb.2.exit 149 liveins: $rdi, $esi 150 151 ; This block should _not_ have the first DBG_VALUE sunk out from it, as it 152 ; would pass a later DBG_VALUE of the same variable location. An undef 153 ; DBG_VALUE should be left behind though. 154 ; CHECK-LABEL: bb.0.entry: 155 ; CHECK: [[TEST2VREG:%[0-9]+]]:gr64 = COPY $rdi 156 ; CHECK-NEXT: CMP32ri $esi, 0 157 ; CHECK-NEXT: DBG_VALUE $noreg, $noreg, [[VAR2NUM]] 158 ; CHECK-NEXT: CMP32ri $esi, 0 159 ; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR2NUM]] 160 ; CHECK-NEXT: JCC_1 %bb.1, 4 161 ; CHECK-NEXT: JMP_1 162 163 %2:gr64 = COPY $rdi 164 %5:gr64 = ADD64ri8 %2, 1, implicit-def dead $eflags 165 CMP32ri $esi, 0, implicit-def $eflags 166 DBG_VALUE %5, $noreg, !103, !17, debug-location !104 167 CMP32ri $esi, 0, implicit-def $eflags 168 DBG_VALUE 0, $noreg, !103, !17, debug-location !104 169 JCC_1 %bb.1.block1, 4, implicit $eflags 170 JMP_1 %bb.2.exit 171 172 bb.1.block1: 173 successors: %bb.2.exit 174 175 ; This block should receive no DBG_VALUE. 176 ; CHECK-LABEL: bb.1.block1: 177 ; CHECK-NOT: DBG_VALUE 178 ; CHECK: [[SUNKVREG2:%[0-9]+]]:gr64 = ADD64ri8 [[TEST2VREG]] 179 ; CHECK-NOT: DBG_VALUE 180 ; CHECK-NEXT: ADD64ri8 181 ; CHECK: JMP_1 %bb.2 182 %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags 183 JMP_1 %bb.2.exit 184 185 bb.2.exit: 186 $rax = MOV64rr %2 187 RET 0 188... 189--- 190name: test3 191tracksRegLiveness: true 192liveins: 193 - { reg: '$rdi', virtual-reg: '%2' } 194 - { reg: '$rsi', virtual-reg: '%2' } 195body: | 196 bb.0.entry: 197 successors: %bb.1.block1, %bb.2.exit 198 liveins: $rdi, $esi 199 200 ; The copy from %2 to %5 will sink into a later block, and the first 201 ; DBG_VALUE cannot pass the second. But, we should be able to recover 202 ; the variable location through copy propagation. 203 ; CHECK-LABEL: bb.0.entry: 204 ; CHECK: [[TEST3VREG:%[0-9]+]]:gr64 = COPY $rdi 205 ; CHECK-NEXT: CMP32ri $esi, 0 206 ; CHECK-NEXT: DBG_VALUE [[TEST3VREG]], $noreg, [[VAR3NUM]] 207 ; CHECK-NEXT: CMP32ri $esi, 0 208 ; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR3NUM]] 209 ; CHECK-NEXT: JCC_1 %bb.1, 4 210 ; CHECK-NEXT: JMP_1 211 212 %2:gr64 = COPY $rdi 213 %5:gr64 = COPY %2 214 CMP32ri $esi, 0, implicit-def $eflags 215 DBG_VALUE %5, $noreg, !203, !17, debug-location !204 216 CMP32ri $esi, 0, implicit-def $eflags 217 DBG_VALUE 0, $noreg, !203, !17, debug-location !204 218 JCC_1 %bb.1.block1, 4, implicit $eflags 219 JMP_1 %bb.2.exit 220 221 bb.1.block1: 222 successors: %bb.2.exit 223 224 ; This block should receive no DBG_VALUE. 225 ; CHECK-LABEL: bb.1.block1: 226 ; CHECK-NOT: DBG_VALUE 227 ; CHECK: COPY [[TEST3VREG]] 228 ; CHECK-NOT: DBG_VALUE 229 ; CHECK-NEXT: ADD64ri8 230 ; CHECK: JMP_1 %bb.2 231 %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags 232 JMP_1 %bb.2.exit 233 234 bb.2.exit: 235 $rax = MOV64rr %2 236 RET 0 237... 238