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https://github.com/RPCS3/llvm.git
synced 2026-08-28 05:10:05 -04:00
Taewook Oh
5c088820ba
Summary: D25742 improved the precision of debug locations for PGO by removing debug locations from common tail when tail-merging. However, if identical insturctions that are merged into a common tail have the same debug locations, there's no need to remove them. This patch creates a merged debug location of identical instructions across SameTails and assign it to the instruction in the common tail, so that the debug locations are maintained if they are same across identical instructions. Reviewers: aprantl, probinson, MatzeB, rob.lougher Reviewed By: aprantl Subscribers: andreadb, llvm-commits Differential Revision: https://reviews.llvm.org/D30226 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297805 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: llc -stop-after=branch-folder < %s | FileCheck %s
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;
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; bb2 and bb3 in the IR below will be tail-merged into a single basic block.
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; As br instructions in bb2 and bb3 have the same debug location, make sure that
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; the branch instruction in the merged basic block still maintains the debug
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; location info.
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;
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; CHECK: [[DLOC:![0-9]+]] = !DILocation(line: 2, column: 2, scope: !{{[0-9]+}})
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; CHECK: TEST64rr{{.*}}%rsi, %rsi, implicit-def %eflags
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; CHECK-NEXT: JNE_1{{.*}}, debug-location [[DLOC]]
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @foo(i1 %b, i8* %p) {
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bb1:
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br i1 %b, label %bb2, label %bb3
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bb2:
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%a1 = icmp eq i8* %p, null
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br i1 %a1, label %bb4, label %bb5, !dbg !6
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bb3:
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%a2 = icmp eq i8* %p, null
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br i1 %a2, label %bb4, label %bb5, !dbg !6
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bb4:
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ret i32 1
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bb5:
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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 = !{!2, !3}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
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!1 = !DIFile(filename: "foo.c", directory: "b/")
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!2 = !{i32 2, !"Dwarf Version", i32 4}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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!5 = distinct !DILexicalBlock(scope: !4, file: !1, line: 1, column: 1)
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!6 = !DILocation(line: 2, column: 2, scope: !5)
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