machine-function-splitter.ll
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -split-machine-functions | FileCheck %s -check-prefix=MFS-DEFAULTS
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -split-machine-functions -mfs-count-threshold=2000 | FileCheck %s --dump-input=always -check-prefix=MFS-OPTS1
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -split-machine-functions -mfs-psi-cutoff=950000 | FileCheck %s -check-prefix=MFS-OPTS2
define void @foo1(i1 zeroext %0) nounwind !prof !14 !section_prefix !15 {
;; Check that cold block is moved to .text.unlikely.
; MFS-DEFAULTS-LABEL: foo1
; MFS-DEFAULTS: .section .text.unlikely.foo1
; MFS-DEFAULTS-NEXT: foo1.cold:
; MFS-DEFAULTS-NOT: callq bar
; MFS-DEFAULTS-NEXT: callq baz
br i1 %0, label %2, label %4, !prof !17
2: ; preds = %1
%3 = call i32 @bar()
br label %6
4: ; preds = %1
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
ret void
}
define void @foo2(i1 zeroext %0) nounwind !prof !23 !section_prefix !16 {
;; Check that function marked unlikely is not split.
; MFS-DEFAULTS-LABEL: foo2
; MFS-DEFAULTS-NOT: foo2.cold:
br i1 %0, label %2, label %4, !prof !17
2: ; preds = %1
%3 = call i32 @bar()
br label %6
4: ; preds = %1
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
ret void
}
define void @foo3(i1 zeroext %0) nounwind !section_prefix !15 {
;; Check that function without profile data is not split.
; MFS-DEFAULTS-LABEL: foo3
; MFS-DEFAULTS-NOT: foo3.cold:
br i1 %0, label %2, label %4
2: ; preds = %1
%3 = call i32 @bar()
br label %6
4: ; preds = %1
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
ret void
}
define void @foo4(i1 zeroext %0, i1 zeroext %1) nounwind !prof !20 {
;; Check that count threshold works.
; MFS-OPTS1-LABEL: foo4
; MFS-OPTS1: .section .text.unlikely.foo4
; MFS-OPTS1-NEXT: foo4.cold:
; MFS-OPTS1-NOT: callq bar
; MFS-OPTS1-NOT: callq baz
; MFS-OPTS1-NEXT: callq bam
br i1 %0, label %3, label %7, !prof !18
3:
%4 = call i32 @bar()
br label %7
5:
%6 = call i32 @baz()
br label %7
7:
br i1 %1, label %8, label %10, !prof !19
8:
%9 = call i32 @bam()
br label %12
10:
%11 = call i32 @baz()
br label %12
12:
%13 = tail call i32 @qux()
ret void
}
define void @foo5(i1 zeroext %0, i1 zeroext %1) nounwind !prof !20 {
;; Check that profile summary info cutoff works.
; MFS-OPTS2-LABEL: foo5
; MFS-OPTS2: .section .text.unlikely.foo5
; MFS-OPTS2-NEXT: foo5.cold:
; MFS-OPTS2-NOT: callq bar
; MFS-OPTS2-NOT: callq baz
; MFS-OPTS2-NEXT: callq bam
br i1 %0, label %3, label %7, !prof !21
3:
%4 = call i32 @bar()
br label %7
5:
%6 = call i32 @baz()
br label %7
7:
br i1 %1, label %8, label %10, !prof !22
8:
%9 = call i32 @bam()
br label %12
10:
%11 = call i32 @baz()
br label %12
12:
%13 = call i32 @qux()
ret void
}
define void @foo6(i1 zeroext %0) nounwind section "nosplit" !prof !14 {
;; Check that function with section attribute is not split.
; MFS-DEFAULTS-LABEL: foo6
; MFS-DEFAULTS-NOT: foo6.cold:
br i1 %0, label %2, label %4, !prof !17
2: ; preds = %1
%3 = call i32 @bar()
br label %6
4: ; preds = %1
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
ret void
}
define i32 @foo7(i1 zeroext %0) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) !prof !14 {
;; Check that cold ehpads are not split out.
; MFS-DEFAULTS-LABEL: foo7
; MFS-DEFAULTS: .section .text.unlikely.foo7,"ax",@progbits
; MFS-DEFAULTS-NEXT: foo7.cold:
; MFS-DEFAULTS-NOT: callq _Unwind_Resume
; MFS-DEFAULTS: callq baz
entry:
invoke void @_Z1fv()
to label %try.cont unwind label %lpad
lpad:
%1 = landingpad { i8*, i32 }
cleanup
catch i8* bitcast (i8** @_ZTIi to i8*)
resume { i8*, i32 } %1
try.cont:
br i1 %0, label %2, label %4, !prof !17
2: ; preds = try.cont
%3 = call i32 @bar()
br label %6
4: ; preds = %1
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
ret i32 %7
}
declare i32 @bar()
declare i32 @baz()
declare i32 @bam()
declare i32 @qux()
declare void @_Z1fv()
declare i32 @__gxx_personality_v0(...)
@_ZTIi = external constant i8*
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"ProfileSummary", !1}
!1 = !{!2, !3, !4, !5, !6, !7, !8, !9}
!2 = !{!"ProfileFormat", !"InstrProf"}
!3 = !{!"TotalCount", i64 10000}
!4 = !{!"MaxCount", i64 10}
!5 = !{!"MaxInternalCount", i64 1}
!6 = !{!"MaxFunctionCount", i64 1000}
!7 = !{!"NumCounts", i64 3}
!8 = !{!"NumFunctions", i64 5}
!9 = !{!"DetailedSummary", !10}
!10 = !{!11, !12, !13}
!11 = !{i32 10000, i64 100, i32 1}
!12 = !{i32 999900, i64 100, i32 1}
!13 = !{i32 999999, i64 1, i32 2}
!14 = !{!"function_entry_count", i64 7000}
!15 = !{!"function_section_prefix", !".hot"}
!16 = !{!"function_section_prefix", !".unlikely"}
!17 = !{!"branch_weights", i32 7000, i32 0}
!18 = !{!"branch_weights", i32 3000, i32 4000}
!19 = !{!"branch_weights", i32 1000, i32 6000}
!20 = !{!"function_entry_count", i64 10000}
!21 = !{!"branch_weights", i32 6000, i32 4000}
!22 = !{!"branch_weights", i32 80, i32 9920}
!23 = !{!"function_entry_count", i64 7}