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      1 # RUN: llc -mtriple=x86_64-none-linux-gnu -run-pass=postra-machine-sink -verify-machineinstrs  -o - %s | FileCheck %s
      2 #
      3 # This test was originally generated from the following sample:
      4 #
      5 # int x0;
      6 # extern void x3(int, int);
      7 # void x1(int x2) {
      8 #   if (x0)
      9 #     x3(0, x2);
     10 # }
     11 #
     12 # The code generates a COPY instruction which the PostRA Machine Sink pass will
     13 # try to sink.  Earlier versions were not performing the sink due to a
     14 # DBG_VALUE instruction confusing the sinking algorithm.
     15 
     16 --- |
     17   @x0 = common dso_local global i32 0, align 4, !dbg !0
     18 
     19   define dso_local void @x1(i32) !dbg !11 {
     20     %2 = alloca i32, align 4
     21     store i32 %0, i32* %2, align 4
     22     call void @llvm.dbg.declare(metadata i32* %2, metadata !14, metadata !DIExpression()), !dbg !16
     23     %3 = load i32, i32* @x0, align 4, !dbg !16
     24     %4 = icmp ne i32 %3, 0, !dbg !16
     25     br i1 %4, label %5, label %7, !dbg !16
     26 
     27   ; <label>:5:                                      ; preds = %1
     28     %6 = load i32, i32* %2, align 4, !dbg !16
     29     call void @x3(i32 0, i32 %6), !dbg !16
     30     br label %7, !dbg !16
     31 
     32   ; <label>:7:                                      ; preds = %5, %1
     33     ret void, !dbg !16
     34   }
     35 
     36   declare void @llvm.dbg.declare(metadata, metadata, metadata)
     37   declare dso_local void @x3(i32, i32)
     38 
     39   !llvm.dbg.cu = !{!2}
     40   !llvm.module.flags = !{!7, !8}
     41 
     42   !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
     43   !1 = distinct !DIGlobalVariable(name: "x0", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
     44   !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
     45   !3 = !DIFile(filename: "test.c", directory: "")
     46   !4 = !{}
     47   !5 = !{!0}
     48   !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
     49   !7 = !{i32 2, !"Dwarf Version", i32 4}
     50   !8 = !{i32 2, !"Debug Info Version", i32 3}
     51   !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)
     52   !12 = !DISubroutineType(types: !13)
     53   !13 = !{null, !6}
     54   !14 = !DILocalVariable(name: "x2", arg: 1, scope: !11, file: !3, line: 3, type: !6)
     55   !15 = distinct !DILexicalBlock(scope: !11, file: !3, line: 4, column: 7)
     56   !16 = !DILocation(line: 4, column: 7, scope: !15)
     57 
     58 ...
     59 ---
     60 # CHECK: name: x1
     61 # CHECK: bb.0:
     62 # CHECK-NOT: $eax = COPY $edi
     63 # CHECK: bb.1:
     64 # CHECK: renamable $eax = COPY $edi
     65 # CHECK-NEXT: DBG_VALUE debug-use $eax,
     66 # CHECK: bb.2:
     67 name:            x1
     68 alignment:       4
     69 tracksRegLiveness: true
     70 body: |
     71   bb.0:
     72     successors: %bb.2, %bb.1; %bb.2, %bb.1
     73     liveins: $edi
     74     DBG_VALUE debug-use $edi, debug-use $noreg, !14, !DIExpression(), debug-location !16
     75     renamable $eax = COPY $edi
     76     DBG_VALUE debug-use $eax, debug-use $noreg, !14, !DIExpression(), debug-location !16
     77     CMP32mi8 $rip, 1, $noreg, @x0, $noreg, 0, implicit-def $eflags, debug-location !16
     78     JE_1 %bb.2, implicit killed $eflags, debug-location !16
     79     JMP_1 %bb.1, debug-location !16
     80 
     81   bb.1:
     82     liveins: $eax
     83     $edi = MOV32r0 implicit-def dead $eflags, debug-location !16
     84     $esi = COPY killed renamable $eax, debug-location !16
     85 
     86   bb.2:
     87     RET 0, debug-location !16
     88 ...
     89