| # RUN: llc -mtriple=x86_64-none-linux-gnu -run-pass=postra-machine-sink -verify-machineinstrs -o - %s | FileCheck %s |
| # |
| # This test was originally generated from the following sample: |
| # |
| # int x0; |
| # extern void x3(int, int); |
| # void x1(int x2) { |
| # if (x0) |
| # x3(0, x2); |
| # } |
| # |
| # The code generates a COPY instruction which the PostRA Machine Sink pass will |
| # try to sink. Earlier versions were not performing the sink due to a |
| # DBG_VALUE instruction confusing the sinking algorithm. |
| |
| --- | |
| @x0 = common dso_local global i32 0, align 4, !dbg !0 |
| |
| define dso_local void @x1(i32) !dbg !11 { |
| %2 = alloca i32, align 4 |
| store i32 %0, i32* %2, align 4 |
| call void @llvm.dbg.declare(metadata i32* %2, metadata !14, metadata !DIExpression()), !dbg !16 |
| %3 = load i32, i32* @x0, align 4, !dbg !16 |
| %4 = icmp ne i32 %3, 0, !dbg !16 |
| br i1 %4, label %5, label %7, !dbg !16 |
| |
| ; <label>:5: ; preds = %1 |
| %6 = load i32, i32* %2, align 4, !dbg !16 |
| call void @x3(i32 0, i32 %6), !dbg !16 |
| br label %7, !dbg !16 |
| |
| ; <label>:7: ; preds = %5, %1 |
| ret void, !dbg !16 |
| } |
| |
| declare void @llvm.dbg.declare(metadata, metadata, metadata) |
| declare dso_local void @x3(i32, i32) |
| |
| !llvm.dbg.cu = !{!2} |
| !llvm.module.flags = !{!7, !8} |
| |
| !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) |
| !1 = distinct !DIGlobalVariable(name: "x0", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true) |
| !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5) |
| !3 = !DIFile(filename: "test.c", directory: "") |
| !4 = !{} |
| !5 = !{!0} |
| !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !7 = !{i32 2, !"Dwarf Version", i32 4} |
| !8 = !{i32 2, !"Debug Info Version", i32 3} |
| !11 = distinct !DISubprogram(name: "x1", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !2) |
| !12 = !DISubroutineType(types: !13) |
| !13 = !{null, !6} |
| !14 = !DILocalVariable(name: "x2", arg: 1, scope: !11, file: !3, line: 3, type: !6) |
| !15 = distinct !DILexicalBlock(scope: !11, file: !3, line: 4, column: 7) |
| !16 = !DILocation(line: 4, column: 7, scope: !15) |
| |
| ... |
| --- |
| # CHECK: name: x1 |
| # CHECK: bb.0: |
| # CHECK-NOT: $eax = COPY $edi |
| # CHECK: bb.1: |
| # CHECK: renamable $eax = COPY $edi |
| # CHECK-NEXT: DBG_VALUE debug-use $eax, |
| # CHECK: bb.2: |
| name: x1 |
| alignment: 4 |
| tracksRegLiveness: true |
| body: | |
| bb.0: |
| successors: %bb.2, %bb.1; %bb.2, %bb.1 |
| liveins: $edi |
| DBG_VALUE debug-use $edi, debug-use $noreg, !14, !DIExpression(), debug-location !16 |
| renamable $eax = COPY $edi |
| DBG_VALUE debug-use $eax, debug-use $noreg, !14, !DIExpression(), debug-location !16 |
| CMP32mi8 $rip, 1, $noreg, @x0, $noreg, 0, implicit-def $eflags, debug-location !16 |
| JE_1 %bb.2, implicit killed $eflags, debug-location !16 |
| JMP_1 %bb.1, debug-location !16 |
| |
| bb.1: |
| liveins: $eax |
| $edi = MOV32r0 implicit-def dead $eflags, debug-location !16 |
| $esi = COPY killed renamable $eax, debug-location !16 |
| |
| bb.2: |
| RET 0, debug-location !16 |
| ... |