| # RUN: llc -mtriple=x86_64-unknown-unknown -run-pass=machine-sink -o - %s | FileCheck %s |
| # In the first test, check various things when we sink machine instructions: |
| # a) DBG_VALUEs should sink with defs |
| # b) Undefs should be left behind |
| # c) DBG_VALUEs not immediately following the defining inst should sink too |
| # d) If we generate debug-use-before-defs through sinking, and can copy |
| # propagate to a different value, we should do that. |
| # |
| # Test two checks DBG_VALUEs do not sink past a DBG_VALUE in the same block |
| # that redefines the variable location, while three checks that copy-propagation |
| # happens in the same scenario. |
| --- | |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @x = common local_unnamed_addr global i32 0, align 4, !dbg !0 |
| |
| ; Function Attrs: noreturn nounwind uwtable |
| define void @Process(i32* nocapture readonly %p) local_unnamed_addr !dbg !9 { |
| ; Stripped |
| entry: |
| br label %nou |
| nou: |
| br label %exit |
| exit: |
| ret void |
| } |
| |
| define void @test2(i32* nocapture readonly %p) local_unnamed_addr !dbg !101 { |
| ; Stripped |
| entry: |
| br label %block1 |
| block1: |
| br label %exit |
| exit: |
| ret void |
| } |
| |
| define void @test3(i32* nocapture readonly %p) local_unnamed_addr !dbg !201 { |
| ; Stripped |
| entry: |
| br label %block1 |
| block1: |
| br label %exit |
| exit: |
| ret void |
| } |
| |
| ; Function Attrs: nounwind readnone |
| declare void @llvm.dbg.value(metadata, i64, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!1} |
| !llvm.module.flags = !{!6, !7} |
| !llvm.ident = !{!8} |
| |
| !0 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true), expr: !DIExpression()) |
| !1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4) |
| !2 = !DIFile(filename: "t.c", directory: "") |
| !3 = !{} |
| !4 = !{!0} |
| !5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !6 = !{i32 2, !"Dwarf Version", i32 4} |
| !7 = !{i32 2, !"Debug Info Version", i32 3} |
| !8 = !{!"clang version 4.0.0 "} |
| !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) |
| !10 = !DISubroutineType(types: !11) |
| !11 = !{null, !12} |
| !12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64) |
| !13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14) |
| !14 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) |
| !15 = !{!16} |
| !16 = !DILocalVariable(name: "p", arg: 1, scope: !9, file: !2, line: 2, type: !12) |
| !17 = !DIExpression() |
| !18 = !DILocation(line: 2, column: 34, scope: !9) |
| !28 = !DILexicalBlockFile(scope: !9, file: !2, discriminator: 1) |
| !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) |
| !102 = !{!103} |
| !103 = !DILocalVariable(name: "q", arg: 1, scope: !101, file: !2, line: 2, type: !12) |
| !104 = !DILocation(line: 1, column: 1, scope: !101) |
| !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) |
| !202 = !{!203} |
| !203 = !DILocalVariable(name: "r", arg: 1, scope: !201, file: !2, line: 2, type: !12) |
| !204 = !DILocation(line: 1, column: 1, scope: !201) |
| |
| ; CHECK: [[VARNUM:![0-9]+]] = !DILocalVariable(name: "p", |
| ; CHECK: [[VAR2NUM:![0-9]+]] = !DILocalVariable(name: "q", |
| ; CHECK: [[VAR3NUM:![0-9]+]] = !DILocalVariable(name: "r", |
| |
| ... |
| --- |
| name: Process |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi', virtual-reg: '%2' } |
| - { reg: '$rsi', virtual-reg: '%2' } |
| body: | |
| bb.0.entry: |
| successors: %bb.1.nou(0x80000000), %bb.2.exit |
| liveins: $rdi, $esi |
| |
| ; This block should have the vreg copy sunk from it, the DBG_VALUE with it, |
| ; and a copy-prop'd DBG_VALUE left over. |
| ; CHECK-LABEL: bb.0.entry: |
| ; CHECK: [[ARG0VREG:%[0-9]+]]:gr64 = COPY $rdi |
| ; CHECK-NEXT: CMP32ri $esi, 0 |
| ; CHECK-NEXT: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]] |
| ; CHECK-NEXT: JCC_1 %bb.1, 4 |
| ; CHECK-NEXT: JMP_1 |
| |
| %2:gr64 = COPY $rdi |
| %5:gr64 = COPY %2 |
| CMP32ri $esi, 0, implicit-def $eflags |
| DBG_VALUE %5, $noreg, !16, !17, debug-location !18 |
| JCC_1 %bb.1.nou, 4, implicit $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.1.nou: |
| successors: %bb.2.exit(0x80000000) |
| |
| ; This block should receive the sunk copy and DBG_VALUE |
| ; CHECK-LABEL: bb.1.nou: |
| ; CHECK: [[SUNKVREG:%[0-9]+]]:gr64 = COPY [[ARG0VREG]] |
| ; CHECK-NEXT: DBG_VALUE [[SUNKVREG]], $noreg, [[VARNUM]] |
| ; CHECK-NEXT: ADD64ri8 |
| ; CHECK-NEXT: JMP_1 |
| %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.2.exit: |
| ; The DBG_VALUE below should have its operand copy-propagated after |
| ; the copy to %5 is sunk. |
| ; CHECK-LABEL: bb.2.exit: |
| ; CHECK: DBG_VALUE [[ARG0VREG]], $noreg, [[VARNUM]] |
| ; CHECK-NEXT: $rax = MOV64rr [[ARG0VREG]] |
| ; CHECK-NEXT: RET 0 |
| DBG_VALUE %5, _, !16, !17, debug-location !18 |
| $rax = MOV64rr %2 |
| RET 0 |
| ... |
| --- |
| name: test2 |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi', virtual-reg: '%2' } |
| - { reg: '$rsi', virtual-reg: '%2' } |
| body: | |
| bb.0.entry: |
| successors: %bb.1.block1, %bb.2.exit |
| liveins: $rdi, $esi |
| |
| ; This block should _not_ have the first DBG_VALUE sunk out from it, as it |
| ; would pass a later DBG_VALUE of the same variable location. An undef |
| ; DBG_VALUE should be left behind though. |
| ; CHECK-LABEL: bb.0.entry: |
| ; CHECK: [[TEST2VREG:%[0-9]+]]:gr64 = COPY $rdi |
| ; CHECK-NEXT: CMP32ri $esi, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg, $noreg, [[VAR2NUM]] |
| ; CHECK-NEXT: CMP32ri $esi, 0 |
| ; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR2NUM]] |
| ; CHECK-NEXT: JCC_1 %bb.1, 4 |
| ; CHECK-NEXT: JMP_1 |
| |
| %2:gr64 = COPY $rdi |
| %5:gr64 = ADD64ri8 %2, 1, implicit-def dead $eflags |
| CMP32ri $esi, 0, implicit-def $eflags |
| DBG_VALUE %5, $noreg, !103, !17, debug-location !104 |
| CMP32ri $esi, 0, implicit-def $eflags |
| DBG_VALUE 0, $noreg, !103, !17, debug-location !104 |
| JCC_1 %bb.1.block1, 4, implicit $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.1.block1: |
| successors: %bb.2.exit |
| |
| ; This block should receive no DBG_VALUE. |
| ; CHECK-LABEL: bb.1.block1: |
| ; CHECK-NOT: DBG_VALUE |
| ; CHECK: [[SUNKVREG2:%[0-9]+]]:gr64 = ADD64ri8 [[TEST2VREG]] |
| ; CHECK-NOT: DBG_VALUE |
| ; CHECK-NEXT: ADD64ri8 |
| ; CHECK: JMP_1 %bb.2 |
| %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.2.exit: |
| $rax = MOV64rr %2 |
| RET 0 |
| ... |
| --- |
| name: test3 |
| tracksRegLiveness: true |
| liveins: |
| - { reg: '$rdi', virtual-reg: '%2' } |
| - { reg: '$rsi', virtual-reg: '%2' } |
| body: | |
| bb.0.entry: |
| successors: %bb.1.block1, %bb.2.exit |
| liveins: $rdi, $esi |
| |
| ; The copy from %2 to %5 will sink into a later block, and the first |
| ; DBG_VALUE cannot pass the second. But, we should be able to recover |
| ; the variable location through copy propagation. |
| ; CHECK-LABEL: bb.0.entry: |
| ; CHECK: [[TEST3VREG:%[0-9]+]]:gr64 = COPY $rdi |
| ; CHECK-NEXT: CMP32ri $esi, 0 |
| ; CHECK-NEXT: DBG_VALUE [[TEST3VREG]], $noreg, [[VAR3NUM]] |
| ; CHECK-NEXT: CMP32ri $esi, 0 |
| ; CHECK-NEXT: DBG_VALUE 0, $noreg, [[VAR3NUM]] |
| ; CHECK-NEXT: JCC_1 %bb.1, 4 |
| ; CHECK-NEXT: JMP_1 |
| |
| %2:gr64 = COPY $rdi |
| %5:gr64 = COPY %2 |
| CMP32ri $esi, 0, implicit-def $eflags |
| DBG_VALUE %5, $noreg, !203, !17, debug-location !204 |
| CMP32ri $esi, 0, implicit-def $eflags |
| DBG_VALUE 0, $noreg, !203, !17, debug-location !204 |
| JCC_1 %bb.1.block1, 4, implicit $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.1.block1: |
| successors: %bb.2.exit |
| |
| ; This block should receive no DBG_VALUE. |
| ; CHECK-LABEL: bb.1.block1: |
| ; CHECK-NOT: DBG_VALUE |
| ; CHECK: COPY [[TEST3VREG]] |
| ; CHECK-NOT: DBG_VALUE |
| ; CHECK-NEXT: ADD64ri8 |
| ; CHECK: JMP_1 %bb.2 |
| %1:gr64 = ADD64ri8 %5, 4, implicit-def dead $eflags |
| JMP_1 %bb.2.exit |
| |
| bb.2.exit: |
| $rax = MOV64rr %2 |
| RET 0 |
| ... |