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46d7a90a64
This change leverages the work done in D83743 to replay in the SampleProfile inliner to also be used in the CGSCC inliner. NOTE: currently restricted to non-ML advisors only. The added switch `-cgscc-inline-replay=<remarks file>` will replay the inlining decisions in that file where the remarks file is generated via `-Rpass=inline`. The aim here is to make it easier to analyze changes that would modify inlining heuristics to be separated from this behavior. Doing so allows easier examination of assembly and runtime behavior compared to the baseline rather than trying to dig through the large churn caused by inlining. In LTO compilation, since inlining is done twice you can separately specify replay by passing the flag to the FE (`-cgscc-inline-replay=`) and to the linker (`-Wl,cgscc-inline-replay=`) with the remarks generated from their respective places. Testing on mysqld by comparing the inline decisions between base (generates remarks.txt) and diff (replay using identical input/tools with remarks.txt) and examining the inlining sites with `diff` shows 14,000 mismatches out of 247,341 for a ~94% replay accuracy. I believe this gap can be narrowed further though for the general case we may never achieve full accuracy. For my personal use, this is close enough to be representative: I set the baseline as the one generated by the replay on identical input/toolset and compare that to my modified input/toolset using the same replay. Testing: ninja check-llvm newly added test correctly replays CGSCC inlining decisions Reviewed By: mtrofin, wenlei Differential Revision: https://reviews.llvm.org/D94334
120 lines
5.1 KiB
LLVM
120 lines
5.1 KiB
LLVM
;; Note that this needs new pass manager for now. Passing `-cgscc-inline-replay` to legacy pass manager is a no-op.
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;; Check replay inline decisions
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; RUN: opt < %s -passes=inline -pass-remarks=inline -S 2>&1 | FileCheck -check-prefix=DEFAULT %s
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; RUN: opt < %s -passes=inline -cgscc-inline-replay=%S/Inputs/cgscc-inline-replay.txt -pass-remarks=inline -S 2>&1 | FileCheck -check-prefix=REPLAY %s
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@.str = private unnamed_addr constant [11 x i8] c"sum is %d\0A\00", align 1
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define i32 @_Z3sumii(i32 %x, i32 %y) #0 !dbg !6 {
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entry:
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%x.addr = alloca i32, align 4
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%y.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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store i32 %y, i32* %y.addr, align 4
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%tmp = load i32, i32* %x.addr, align 4, !dbg !8
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%tmp1 = load i32, i32* %y.addr, align 4, !dbg !8
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%add = add nsw i32 %tmp, %tmp1, !dbg !8
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%tmp2 = load i32, i32* %x.addr, align 4, !dbg !8
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%tmp3 = load i32, i32* %y.addr, align 4, !dbg !8
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%call = call i32 @_Z3subii(i32 %tmp2, i32 %tmp3), !dbg !8
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ret i32 %add, !dbg !8
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}
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define i32 @_Z3subii(i32 %x, i32 %y) #0 !dbg !9 {
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entry:
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%x.addr = alloca i32, align 4
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%y.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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store i32 %y, i32* %y.addr, align 4
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%tmp = load i32, i32* %x.addr, align 4, !dbg !10
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%tmp1 = load i32, i32* %y.addr, align 4, !dbg !10
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%add = sub nsw i32 %tmp, %tmp1, !dbg !10
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ret i32 %add, !dbg !11
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}
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define i32 @main() #0 !dbg !12 {
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entry:
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%retval = alloca i32, align 4
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%s = alloca i32, align 4
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%i = alloca i32, align 4
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store i32 0, i32* %retval
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store i32 0, i32* %i, align 4, !dbg !13
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br label %while.cond, !dbg !14
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while.cond: ; preds = %if.end, %entry
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%tmp = load i32, i32* %i, align 4, !dbg !15
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%inc = add nsw i32 %tmp, 1, !dbg !15
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store i32 %inc, i32* %i, align 4, !dbg !15
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%cmp = icmp slt i32 %tmp, 400000000, !dbg !15
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br i1 %cmp, label %while.body, label %while.end, !dbg !15
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while.body: ; preds = %while.cond
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%tmp1 = load i32, i32* %i, align 4, !dbg !17
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%cmp1 = icmp ne i32 %tmp1, 100, !dbg !17
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br i1 %cmp1, label %if.then, label %if.else, !dbg !17
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if.then: ; preds = %while.body
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%tmp2 = load i32, i32* %i, align 4, !dbg !19
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%tmp3 = load i32, i32* %s, align 4, !dbg !19
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%call = call i32 @_Z3sumii(i32 %tmp2, i32 %tmp3), !dbg !19
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store i32 %call, i32* %s, align 4, !dbg !19
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br label %if.end, !dbg !19
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if.else: ; preds = %while.body
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store i32 30, i32* %s, align 4, !dbg !21
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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br label %while.cond, !dbg !23
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while.end: ; preds = %while.cond
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%tmp4 = load i32, i32* %s, align 4, !dbg !25
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%call2 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i32 0, i32 0), i32 %tmp4), !dbg !25
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ret i32 0, !dbg !26
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}
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declare i32 @printf(i8*, ...)
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attributes #0 = { "use-sample-profile" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.5 ", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "calls.cc", directory: ".")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 1, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 3.5 "}
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!6 = distinct !DISubprogram(name: "sum", linkageName: "_Z3sumii", scope: !1, file: !1, line: 3, type: !7, scopeLine: 3, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!7 = !DISubroutineType(types: !2)
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!8 = !DILocation(line: 4, scope: !6)
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!9 = distinct !DISubprogram(name: "sub", linkageName: "_Z3subii", scope: !1, file: !1, line: 20, type: !7, scopeLine: 20, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!10 = !DILocation(line: 20, scope: !9)
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!11 = !DILocation(line: 21, scope: !9)
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!12 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 7, type: !7, scopeLine: 7, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!13 = !DILocation(line: 8, scope: !12)
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!14 = !DILocation(line: 9, scope: !12)
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!15 = !DILocation(line: 9, scope: !16)
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!16 = !DILexicalBlockFile(scope: !12, file: !1, discriminator: 2)
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!17 = !DILocation(line: 10, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !12, file: !1, line: 10)
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!19 = !DILocation(line: 10, scope: !20)
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!20 = !DILexicalBlockFile(scope: !18, file: !1, discriminator: 2)
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!21 = !DILocation(line: 10, scope: !22)
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!22 = !DILexicalBlockFile(scope: !18, file: !1, discriminator: 4)
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!23 = !DILocation(line: 10, scope: !24)
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!24 = !DILexicalBlockFile(scope: !18, file: !1, discriminator: 6)
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!25 = !DILocation(line: 11, scope: !12)
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!26 = !DILocation(line: 12, scope: !12)
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; DEFAULT: _Z3subii inlined into _Z3sumii
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; DEFAULT: _Z3sumii inlined into main
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; DEFAULT-NOT: _Z3subii inlined into main
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; REPLAY: _Z3sumii inlined into main
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; REPLAY: _Z3subii inlined into main
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; REPLAY-NOT: _Z3subii inlined into _Z3sumii
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