caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
a78861fc55d18046989ff4d624a037e9181da170
clang-p2996/llvm/test/Transforms/SampleProfile/pseudo-probe-profile.ll
Lei Wang e20b904721 [PseudoProbe] Make probe discriminator compatible with dwarf base discriminator (#94506) 
It's useful if the probe-based build can consume a dwarf based
profile(e.g. the profile transition), before there is a conflict for the
discriminator, this change tries to mitigate the issue by encoding the
dwarf base discriminator into the probe discriminator.
As the num of probe id(num of basic block and calls) starts from 1,
there are some unused space. We try to reuse some bit of the probe id.
The new encode rule is:
- Use a bit to [28:28] to indicate whether dwarf base discriminator is
encoded.(fortunately we can borrow this bit from the `PseudoProbeType`)
- If the bit is set, use [15:3] for probe id, [18:16] for dwarf base
discriminator. Otherwise, still use [18:3] for probe id.

Note that these doesn't affect the original probe id capacity, we still
prioritize probe id encoding, i.e. the base discriminator is not encoded
when probe id is bigger than [15:3].
 
Then adjust `getBaseDiscriminatorFromDiscriminator` to use the base
discriminator from the probe discriminator.
2024-06-07 11:37:49 -07:00

156 lines
6.7 KiB
LLVM
Raw Blame History

; RUN: opt < %s -passes=pseudo-probe,sample-profile -sample-profile-file=%S/Inputs/pseudo-probe-profile.prof -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml -sample-profile-use-profi=0 -S -o %t
; RUN: FileCheck %s --input-file %t
; RUN: FileCheck %s -check-prefix=YAML --input-file %t.opt.yaml
; RUN: opt < %t -passes=sample-profile -sample-profile-file=%S/Inputs/pseudo-probe-profile.prof -sample-profile-remove-probe -S | FileCheck %s -check-prefix=REMOVE-PROBE
; REMOVE-PROBE-NOT: call void @llvm.pseudoprobe
define dso_local i32 @foo(i32 %x, ptr %f) #0 !dbg !4 {
entry:
%retval = alloca i32, align 4
%x.addr = alloca i32, align 4
store i32 %x, ptr %x.addr, align 4
%0 = load i32, ptr %x.addr, align 4
%cmp = icmp eq i32 %0, 0
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 1, i32 0, i64 -1)
br i1 %cmp, label %if.then, label %if.else
; CHECK: br i1 %cmp, label %if.then, label %if.else, !prof ![[PD1:[0-9]+]]
if.then:
; CHECK: call {{.*}}, !dbg ![[#PROBE1:]], !prof ![[PROF1:[0-9]+]]
call void %f(i32 1)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 2, i32 0, i64 -1)
store i32 1, ptr %retval, align 4
br label %return
if.else:
; CHECK: call {{.*}}, !dbg ![[#PROBE2:]], !prof ![[PROF2:[0-9]+]]
call void %f(i32 2)
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 4, i32 0, i64 -1)
store i32 2, ptr %retval, align 4
br label %return
return:
; CHECK: call void @llvm.pseudoprobe(i64 [[#GUID:]], i64 6, i32 0, i64 -1)
%1 = load i32, ptr %retval, align 4
ret i32 %1
}
attributes #0 = {"use-sample-profile"}
; CHECK: ![[PD1]] = !{!"branch_weights", i32 8, i32 7}
; CHECK: ![[#PROBE1]] = !DILocation(line: 0, scope: ![[#SCOPE1:]])
;; A discriminator of 387973151 which is 0x1720001f in hexdecimal, stands for an indirect call probe
;; with an index of 3.
; CHECK: ![[#SCOPE1]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 387973151)
; CHECK: ![[PROF1]] = !{!"VP", i32 0, i64 7, i64 9191153033785521275, i64 5, i64 -1069303473483922844, i64 2}
;; A discriminator of 387973167 which is 0x1720002f in hexdecimal, stands for an indirect call probe
;; with an index of 5.
; CHECK: ![[#PROBE2]] = !DILocation(line: 0, scope: ![[#SCOPE2:]])
; CHECK: ![[#SCOPE2]] = !DILexicalBlockFile(scope: ![[#]], file: ![[#]], discriminator: 387973167)
; CHECK: ![[PROF2]] = !{!"VP", i32 0, i64 6, i64 -1069303473483922844, i64 4, i64 9191153033785521275, i64 2}
!llvm.module.flags = !{!9, !10}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
!1 = !DIFile(filename: "test.c", directory: "")
!2 = !{}
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !5, unit: !0, retainedNodes: !2)
!5 = !DISubroutineType(types: !6)
!6 = !{!7}
!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!9 = !{i32 2, !"Dwarf Version", i32 4}
!10 = !{i32 2, !"Debug Info Version", i32 3}
; Checking to see if YAML file is generated and contains remarks
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '13'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '1'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '13'
;YAML-NEXT: - String: ')'
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '7'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '3'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '7'
;YAML-NEXT: - String: ')'
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '7'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '2'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '7'
;YAML-NEXT: - String: ')'
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '6'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '5'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '6'
;YAML-NEXT: - String: ')'
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '6'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '4'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '6'
;YAML-NEXT: - String: ')'
;YAML: --- !Analysis
;YAML-NEXT: Pass: sample-profile
;YAML-NEXT: Name: AppliedSamples
;YAML-NEXT: DebugLoc: { File: test.c, Line: 0, Column: 0 }
;YAML-NEXT: Function: foo
;YAML-NEXT: Args:
;YAML-NEXT: - String: 'Applied '
;YAML-NEXT: - NumSamples: '13'
;YAML-NEXT: - String: ' samples from profile (ProbeId='
;YAML-NEXT: - ProbeId: '6'
;YAML-NEXT: - String: ', Factor='
;YAML-NEXT: - Factor: '1.000000e+00'
;YAML-NEXT: - String: ', OriginalSamples='
;YAML-NEXT: - OriginalSamples: '13'
;YAML-NEXT: - String: ')'
Reference in New Issue View Git Blame Copy Permalink