35fc103e1e
According to `llvm-dwarfdump --statistics` this salvages 43 additional unique source variables in a stage2 build of clang. It increases the size of the .debug_loc section by 0.002% (or 2864 bytes). Differential Revision: https://reviews.llvm.org/D43220 llvm-svn: 325035
41 lines
1.9 KiB
LLVM
41 lines
1.9 KiB
LLVM
; RUN: opt < %s -debugify -basicaa -dse -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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declare noalias i8* @malloc(i32)
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declare void @test_f()
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define i32* @test_salvage() {
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; CHECK-LABEL: @test_salvage()
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; CHECK-NEXT: malloc
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: call void @test_f()
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; CHECK-NEXT: store i32 0, i32* %P
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; Check that all four original local variables have their values preserved.
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* %p, metadata !8, metadata !DIExpression()), !dbg !14
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32* %P, metadata !10, metadata !DIExpression()), !dbg !15
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32* %P, metadata !11, metadata !DIExpression(DW_OP_deref)), !dbg !18
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32* %P, metadata !13, metadata !DIExpression(DW_OP_deref, DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !19
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%p = tail call i8* @malloc(i32 4)
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%P = bitcast i8* %p to i32*
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%DEAD = load i32, i32* %P
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%DEAD2 = add i32 %DEAD, 1
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store i32 %DEAD2, i32* %P
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call void @test_f()
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store i32 0, i32* %P
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ret i32* %P
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}
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; CHECK: !8 = !DILocalVariable(name: "1", scope: !5, file: !1, line: 1, type: !9)
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; CHECK: !10 = !DILocalVariable(name: "2", scope: !5, file: !1, line: 2, type: !9)
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; CHECK: !11 = !DILocalVariable(name: "3", scope: !5, file: !1, line: 3, type: !12)
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; CHECK: !13 = !DILocalVariable(name: "4", scope: !5, file: !1, line: 4, type: !12)
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; CHECK-DAG: !14 = !DILocation(line: 1, column: 1, scope: !5)
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; CHECK-DAG: !15 = !DILocation(line: 2, column: 1, scope: !5)
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; CHECK-DAG: !18 = !DILocation(line: 3, column: 1, scope: !5)
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; CHECK-DAG: !19 = !DILocation(line: 4, column: 1, scope: !5)
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; CHECK-DAG: !16 = !DILocation(line: 6, column: 1, scope: !5)
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; CHECK-DAG: !17 = !DILocation(line: 7, column: 1, scope: !5)
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