9232ca4712
This patch improves the effectiveness of BDCE's debug info salvaging by processing the instructions in reverse order and delaying dropAllReferences until after debug info salvaging. This allows salvaging of entire chains of deleted instructions! Previously we would remove all references from an instruction, which would make it impossible to use that instruction to salvage a later instruction in the instruction stream, because its operands were already removed. This reapplies the previous patch with a fix for a use-after-free. Differential Revision: https://reviews.llvm.org/D110568
31 lines
1.5 KiB
LLVM
31 lines
1.5 KiB
LLVM
; RUN: opt -adce %s -S -o - | FileCheck %s
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; RUN: opt -bdce %s -S -o - | FileCheck %s
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx"
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define void @f(i32) !dbg !8 {
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entry:
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%p_x = inttoptr i32 %0 to i8*
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%i_x = ptrtoint i8* %p_x to i32
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; CHECK: call void @llvm.dbg.value(metadata i32 %0,
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; CHECK-SAME: !DIExpression(DW_OP_LLVM_convert, 32, DW_ATE_unsigned,
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; CHECK-SAME: DW_OP_LLVM_convert, 64, DW_ATE_unsigned,
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; CHECK-SAME: DW_OP_LLVM_convert, 64, DW_ATE_unsigned,
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; CHECK-SAME: DW_OP_LLVM_convert, 32, DW_ATE_unsigned, DW_OP_stack_value))
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call void @llvm.dbg.value(metadata i32 %i_x, metadata !11, metadata !DIExpression()), !dbg !13
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ret void, !dbg !13
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, emissionKind: FullDebug)
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!1 = !DIFile(filename: "salavage.c", directory: "/")
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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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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !DILocalVariable(name: "x", scope: !8, file: !1, line: 2, type: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !DILocation(line: 1, column: 1, scope: !8)
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