79 lines
3.1 KiB
LLVM
79 lines
3.1 KiB
LLVM
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; RUN: opt %s -instcombine -S | FileCheck %s
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; Test sinking of dbg.values when instcombine sinks associated instructions.
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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; This GEP is sunk, but can be folded into a DIExpression. Check that it
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; gets folded. The dbg.value should be duplicated in the block its sunk
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; into, to maximise liveness.
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;
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; CHECK-LABEL: define i32 @foo(i32*
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; CHECK: call void @llvm.dbg.value(metadata i32* %a, metadata !{{[0-9]+}},
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; CHECK-SAME: metadata !DIExpression(DW_OP_plus_uconst, 4, DW_OP_stack_value))
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; CHECK-NEXT: br label %sink1
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define i32 @foo(i32 *%a) !dbg !7 {
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entry:
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%gep = getelementptr i32, i32 *%a, i32 1
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call void @llvm.dbg.value(metadata i32 *%gep, metadata !16, metadata !12), !dbg !15
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br label %sink1
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sink1:
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; CHECK-LABEL: sink1:
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; CHECK: call void @llvm.dbg.value(metadata i32* %gep,
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; CHECK-SAME: metadata !{{[0-9]+}}, metadata !DIExpression())
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; CHECK-NEXT: load
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%0 = load i32, i32* %gep, align 4, !dbg !15
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ret i32 %0, !dbg !15
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}
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; In this example the GEP cannot (yet) be salvaged. Check that not only is the
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; dbg.value sunk, but an undef dbg.value is left to terminate any earlier
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; value range.
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; CHECK-LABEL: define i32 @bar(
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; CHECK: call void @llvm.dbg.value(metadata i32* undef,
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; CHECK-NEXT: br label %sink2
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define i32 @bar(i32 *%a, i32 %b) !dbg !70 {
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entry:
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%gep = getelementptr i32, i32 *%a, i32 %b
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call void @llvm.dbg.value(metadata i32* %gep, metadata !73, metadata !12), !dbg !74
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br label %sink2
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sink2:
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; CHECK-LABEL: sink2:
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; CHECK: call void @llvm.dbg.value(metadata i32* %gep,
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; CHECK-SAME: metadata !{{[0-9]+}}, metadata !DIExpression())
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; CHECK-NEXT: load
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; CHECK-NEXT: ret
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%0 = load i32, i32* %gep
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ret i32 %0
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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!1 = !DIFile(filename: "a.c", directory: ".")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = !{!"clang"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "j", scope: !7, file: !1, line: 2, type: !10)
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!12 = !DIExpression()
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!15 = !DILocation(line: 5, column: 3, scope: !7)
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!16 = !DILocalVariable(name: "h", scope: !7, file: !1, line: 4, type: !10)
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!70 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !71, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!71 = !DISubroutineType(types: !72)
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!72 = !{!10, !10, !10}
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!73 = !DILocalVariable(name: "k", scope: !70, file: !1, line: 2, type: !10)
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!74 = !DILocation(line: 5, column: 3, scope: !70)
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