51f4e2cda2
DILocations that are not attached to instructions are encoded using METADATA_LOCATION records which have an abbrev. DILocations attached to instructions are interleaved with instruction records as FUNC_CODE_DEBUG_LOC records, which do not have an abbrev (and FUNC_CODE_DEBUG_LOC_AGAIN which have no operands). Add a new FUNCTION_BLOCK abbrev FUNCTION_DEBUG_LOC_ABBREV for FUNC_CODE_DEBUG_LOC records. This reduces the bc file size by up to 7% in CTMark, with many between 2-4% smaller. [per-file file size compile-time-tracker](https://llvm-compile-time-tracker.com/compare.php?from=75cf826849713c00829cdf657e330e24c1a2fd03&to=1e268ebd0a581016660d9d7e942495c1be041f7d&stat=size-file&details=on) (go to stage1-ReleaseLTO-g). This optimisation is motivated by #144102, which adds the new Key Instructions fields to bitcode records. The combined patches still overall look to be a slight improvement over the base. (Originally reviewed in PR #146497) Co-authored-by: Orlando Cazalet-Hyams <orlando.hyams@sony.com>
37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; RUN: llvm-as < %s | llvm-bcanalyzer -dump | FileCheck %s -check-prefix=BC
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; PR23436: Actually emit DEBUG_LOC_AGAIN records.
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; BC: <DEBUG_LOC abbrevid
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; BC: <DEBUG_LOC_AGAIN/>
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; BC: <DEBUG_LOC abbrevid
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; BC: <DEBUG_LOC_AGAIN/>
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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; Check that this round-trips correctly.
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define void @foo() {
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entry:
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%a = add i32 0, 0, !dbg !3
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%b = add i32 0, 1, !dbg !3
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%c = add i32 0, 2, !dbg !4
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ret void, !dbg !4
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}
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; CHECK-LABEL: entry:
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; CHECK-NEXT: %a = add i32 0, 0, !dbg ![[LINE1:[0-9]+]]
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; CHECK-NEXT: %b = add i32 0, 1, !dbg ![[LINE1]]
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; CHECK-NEXT: %c = add i32 0, 2, !dbg ![[LINE2:[0-9]+]]
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; CHECK-NEXT: ret void, !dbg ![[LINE2]]
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; CHECK: ![[LINE1]] = !DILocation(line: 1,
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; CHECK: ![[LINE2]] = !DILocation(line: 2,
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!llvm.module.flags = !{!0}
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!llvm.dbg.cu = !{!1}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "f", directory: "/d"))
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!2 = distinct !DISubprogram(name: "foo", unit: !1)
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!3 = !DILocation(line: 1, scope: !2)
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!4 = !DILocation(line: 2, scope: !2)
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