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39b2cd9b12
Summary: The hoisted instruction is executed speculatively. It could affect the debugging experience as user would see gdb go into code that may not be expected to execute. It will also affect sample profile accuracy by assigning incorrect frequency to source within then/else branch. Reviewers: davidxl, dblaikie, chandlerc, kcc, echristo Subscribers: mehdi_amini, probinson, eric_niebler, andreadb, llvm-commits Differential Revision: https://reviews.llvm.org/D24164 llvm-svn: 280995
84 lines
2.2 KiB
LLVM
84 lines
2.2 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck %s
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; TODO: Track the acutal DebugLoc of the hoisted instruction when no-line
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; DebugLoc is supported (https://reviews.llvm.org/D24180)
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; CHECK: line: 6
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; CHECK-NOT: line: 7
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; CHECK: line: 8
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; CHECK: line: 9
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; CHECK-NOT: line: 10
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; CHECK: line: 11
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; Checks if the debug info for hoisted "x = i" is removed
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; int x;
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; void bar();
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; void baz();
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;
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; void foo(int i) {
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; if (i == 0) {
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; x = i;
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; bar();
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; } else {
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; x = i;
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; baz();
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; }
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; }
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target triple = "x86_64-unknown-linux-gnu"
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@x = global i32 0, align 4
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; Function Attrs: uwtable
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define void @_Z3fooi(i32) #0 !dbg !6 {
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%2 = alloca i32, align 4
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store i32 %0, i32* %2, align 4, !tbaa !8
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%3 = load i32, i32* %2, align 4, !dbg !12, !tbaa !8
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%4 = icmp eq i32 %3, 0, !dbg !13
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br i1 %4, label %5, label %7, !dbg !12
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; <label>:5:
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%6 = load i32, i32* %2, align 4, !dbg !14, !tbaa !8
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store i32 %6, i32* @x, align 4, !dbg !15, !tbaa !8
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call void @_Z3barv(), !dbg !16
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br label %9, !dbg !17
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; <label>:7:
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%8 = load i32, i32* %2, align 4, !dbg !18, !tbaa !8
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store i32 %8, i32* @x, align 4, !dbg !19, !tbaa !8
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call void @_Z3bazv(), !dbg !20
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br label %9
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; <label>:9:
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ret void, !dbg !21
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}
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declare void @_Z3barv() #1
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declare void @_Z3bazv() #1
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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_C_plus_plus, file: !1)
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!1 = !DIFile(filename: "a", directory: "b/")
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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 = !{}
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!6 = distinct !DISubprogram(unit: !0)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9, !9, i64 0}
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!9 = !{!"int", !10, i64 0}
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!10 = !{!"omnipotent char", !11, i64 0}
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!11 = !{!"Simple C++ TBAA"}
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!12 = !DILocation(line: 6, column: 7, scope: !6)
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!13 = !DILocation(line: 6, column: 9, scope: !6)
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!14 = !DILocation(line: 7, column: 9, scope: !6)
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!15 = !DILocation(line: 7, column: 7, scope: !6)
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!16 = !DILocation(line: 8, column: 5, scope: !6)
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!17 = !DILocation(line: 9, column: 3, scope: !6)
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!18 = !DILocation(line: 10, column: 9, scope: !6)
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!19 = !DILocation(line: 10, column: 7, scope: !6)
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!20 = !DILocation(line: 11, column: 5, scope: !6)
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!21 = !DILocation(line: 13, column: 1, scope: !6)
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