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92b9137fcb
Clang FE currently has hot/cold function attribute. But we only have
cold function attribute in LLVM IR.
This patch adds support of hot function attribute to LLVM IR. This
attribute will be used in setting function section prefix/suffix.
Currently .hot and .unlikely suffix only are added in PGO (Sample PGO)
compilation (through isFunctionHotInCallGraph and
isFunctionColdInCallGraph).
This patch changes the behavior. The new behavior is:
(1) If the user annotates a function as hot or isFunctionHotInCallGraph
is true, this function will be marked as hot. Otherwise,
(2) If the user annotates a function as cold or
isFunctionColdInCallGraph is true, this function will be marked as
cold.
The changes are:
(1) user annotated function attribute will used in setting function
section prefix/suffix.
(2) hot attribute overwrites profile count based hotness.
(3) profile count based hotness overwrite user annotated cold attribute.
The intention for these changes is to provide the user a way to mark
certain function as hot in cases where training input is hard to cover
all the hot functions.
Differential Revision: https://reviews.llvm.org/D92493
102 lines
3.2 KiB
LLVM
102 lines
3.2 KiB
LLVM
; Test hot or unlikely section postfix based on profile and user annotation.
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; RUN: llc < %s | FileCheck %s
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: inlinehint norecurse nounwind readnone uwtable
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define dso_local i32 @hot1() #0 !prof !31 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.hot.,"ax",@progbits
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; CHECK: .globl hot1
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; Function Attrs: cold norecurse nounwind readnone uwtable
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define dso_local i32 @cold1() #1 !prof !32 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.unlikely.,"ax",@progbits
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; CHECK: .globl cold1
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; Function Attrs: cold inlinehint noinline norecurse nounwind optsize readnone uwtable
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define dso_local i32 @hot2() #2 !prof !31 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.hot.,"ax",@progbits
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; CHECK: .globl hot2
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define dso_local i32 @normal() {
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entry:
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ret i32 1
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}
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; CHECK: text
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; CHECK: .globl normal
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; Function Attrs: hot noinline norecurse nounwind readnone uwtable
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define dso_local i32 @hot3() #3 !prof !32 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.hot.,"ax",@progbits
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; CHECK: .globl hot3
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; Function Attrs: cold noinline norecurse nounwind optsize readnone uwtable
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define dso_local i32 @cold2() #4 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.unlikely.,"ax",@progbits
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; CHECK: .globl cold2
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; Function Attrs: hot noinline norecurse nounwind readnone uwtable
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define dso_local i32 @hot4() #3 {
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entry:
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ret i32 1
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}
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; CHECK: .section .text.hot.,"ax",@progbits
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; CHECK: .globl hot4
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attributes #0 = { inlinehint norecurse nounwind readnone uwtable }
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attributes #1 = { cold norecurse nounwind readnone uwtable }
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attributes #2 = { cold inlinehint noinline norecurse nounwind optsize readnone uwtable }
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attributes #3 = { hot noinline norecurse nounwind readnone uwtable }
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attributes #4 = { cold noinline norecurse nounwind optsize readnone uwtable }
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!30}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 1, !"ProfileSummary", !2}
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!2 = !{!3, !4, !5, !6, !7, !8, !9, !10, !11, !12}
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!3 = !{!"ProfileFormat", !"InstrProf"}
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!4 = !{!"TotalCount", i64 402020}
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!5 = !{!"MaxCount", i64 200000}
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!6 = !{!"MaxInternalCount", i64 2000}
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!7 = !{!"MaxFunctionCount", i64 200000}
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!8 = !{!"NumCounts", i64 7}
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!9 = !{!"NumFunctions", i64 5}
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!10 = !{!"IsPartialProfile", i64 0}
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!11 = !{!"PartialProfileRatio", double 0.000000e+00}
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!12 = !{!"DetailedSummary", !13}
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!13 = !{!14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29}
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!14 = !{i32 10000, i64 200000, i32 1}
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!15 = !{i32 100000, i64 200000, i32 1}
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!16 = !{i32 200000, i64 200000, i32 1}
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!17 = !{i32 300000, i64 200000, i32 1}
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!18 = !{i32 400000, i64 200000, i32 1}
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!19 = !{i32 500000, i64 100000, i32 3}
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!20 = !{i32 600000, i64 100000, i32 3}
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!21 = !{i32 700000, i64 100000, i32 3}
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!22 = !{i32 800000, i64 100000, i32 3}
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!23 = !{i32 900000, i64 100000, i32 3}
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!24 = !{i32 950000, i64 100000, i32 3}
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!25 = !{i32 990000, i64 100000, i32 3}
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!26 = !{i32 999000, i64 2000, i32 4}
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!27 = !{i32 999900, i64 2000, i32 4}
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!28 = !{i32 999990, i64 10, i32 6}
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!29 = !{i32 999999, i64 10, i32 6}
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!30 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git 53c5fdd59a5cf7fbb4dcb7a7e84c9c4a40d32a84)"}
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!31 = !{!"function_entry_count", i64 100000}
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!32 = !{!"function_entry_count", i64 10}
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