a1b21ed3fb
For a very large module, __llvm_gcov_reset can become very large. __llvm_gcov_reset previously emitted stores to a bunch of globals in one huge basic block. MemCpyOpt would turn many of these stores into memsets, and updating MemorySSA would be extremely slow. Verified that this makes the compile time of certain files go down drastically (20min -> 5min). Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D107538
38 lines
1.6 KiB
LLVM
38 lines
1.6 KiB
LLVM
; RUN: mkdir -p %t && cd %t
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; RUN: opt < %s -S -passes=insert-gcov-profiling | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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define void @foo() !dbg !8 {
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entry:
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ret void, !dbg !12
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}
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define void @bar() !dbg !13 {
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entry:
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ret void, !dbg !14
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}
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; CHECK: define internal void @__llvm_gcov_reset()
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast ([1 x i64]* @__llvm_gcov_ctr to i8*), i8 0, i64 8, i1 false)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* bitcast ([1 x i64]* @__llvm_gcov_ctr.1 to i8*), i8 0, i64 8, i1 false)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "/tmp/a.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{i32 7, !"uwtable", i32 1}
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!8 = distinct !DISubprogram(name: "foo", scope: !9, file: !9, line: 1, type: !10, scopeLine: 1, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!9 = !DIFile(filename: "/tmp/a.c", directory: "")
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!10 = !DISubroutineType(types: !11)
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!11 = !{null}
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!12 = !DILocation(line: 1, column: 13, scope: !8)
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!13 = distinct !DISubprogram(name: "bar", scope: !9, file: !9, line: 2, type: !10, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
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!14 = !DILocation(line: 2, column: 13, scope: !13)
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