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llvm-project/llvm/test/CodeGen/X86/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-psi-cutoff=0 -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
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -split-machine-functions -mfs-split-ehcode | FileCheck %s -check-prefix=MFS-EH-SPLIT
define void @foo1(i1 zeroext %0) nounwind !prof !14 !section_prefix !15 {
;; Check that cold block is moved to .text.split.
; MFS-DEFAULTS-LABEL: foo1
; MFS-DEFAULTS: .section .text.split.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.split.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.split.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 ptr @__gxx_personality_v0 !prof !14 {
;; Check that a single cold ehpad is split out.
; MFS-DEFAULTS-LABEL: foo7
; MFS-DEFAULTS: .section .text.split.foo7,"ax",@progbits
; MFS-DEFAULTS-NEXT: foo7.cold:
; MFS-DEFAULTS: callq baz
; MFS-DEFAULTS: callq _Unwind_Resume@PLT
entry:
invoke void @_Z1fv()
to label %try.cont unwind label %lpad
lpad:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
resume { ptr, 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
}
define i32 @foo8(i1 zeroext %0) personality ptr @__gxx_personality_v0 !prof !14 {
;; Check that all ehpads are treated as hot if one of them is hot.
; MFS-DEFAULTS-LABEL: foo8
; MFS-DEFAULTS: callq _Unwind_Resume@PLT
; MFS-DEFAULTS: callq _Unwind_Resume@PLT
; MFS-DEFAULTS: .section .text.split.foo8,"ax",@progbits
; MFS-DEFAULTS-NEXT: foo8.cold:
; MFS-DEFAULTS: callq baz
;; Check that all ehpads are by default treated as cold with -mfs-split-ehcode.
; MFS-EH-SPLIT-LABEL: foo8
; MFS-EH-SPLIT: callq baz
; MFS-EH-SPLIT: .section .text.split.foo8,"ax",@progbits
; MFS-EH-SPLIT-NEXT: foo8.cold:
; MFS-EH-SPLIT: callq _Unwind_Resume@PLT
; MFS-EH-SPLIT: callq _Unwind_Resume@PLT
entry:
invoke void @_Z1fv()
to label %try.cont unwind label %lpad1
lpad1:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
resume { ptr, i32 } %1
try.cont:
br i1 %0, label %hot, label %cold, !prof !17
hot:
%2 = call i32 @bar()
invoke void @_Z1fv()
to label %exit unwind label %lpad2, !prof !21
lpad2:
%3 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
resume { ptr, i32 } %3
cold:
%4 = call i32 @baz()
br label %exit
exit:
%5 = tail call i32 @qux()
ret i32 %5
}
define void @foo9(i1 zeroext %0) nounwind #0 !prof !14 {
;; Check that function with section attribute is not split.
; MFS-DEFAULTS-LABEL: foo9
; MFS-DEFAULTS-NOT: foo9.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 @foo10(i1 zeroext %0) personality ptr @__gxx_personality_v0 !prof !14 {
;; Check that nop is inserted just before the EH pad if it's beginning a section.
; MFS-DEFAULTS-LABEL: foo10
; MFS-DEFAULTS-LABEL: callq baz
; MFS-DEFAULTS: .section .text.split.foo10,"ax",@progbits
; MFS-DEFAULTS-NEXT: foo10.cold:
; MFS-DEFAULTS: nop
; MFS-DEFAULTS: callq _Unwind_Resume@PLT
entry:
invoke void @_Z1fv()
to label %try.cont unwind label %lpad, !prof !17
lpad:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
resume { ptr, i32 } %1
try.cont:
%2 = call i32 @baz()
ret i32 %2
}
define void @foo11(i1 zeroext %0) personality ptr @__gxx_personality_v0 {
;; Check that function having landing pads are split with mfs-split-ehcode
;; even in the absence of profile data
; MFS-EH-SPLIT-LABEL: foo11
; MFS-EH-SPLIT: .section .text.split.foo11,"ax",@progbits
; MFS-EH-SPLIT-NEXT: foo11.cold:
; MFS-EH-SPLIT: nop
; MFS-EH-SPLIT: callq _Unwind_Resume@PLT
entry:
invoke void @_Z1fv()
to label %2 unwind label %lpad
lpad:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
resume { ptr, i32 } %1
2: ; preds = entry
%3 = tail call i32 @qux()
ret void
}
define i32 @foo12(i1 zeroext %0) personality ptr @__gxx_personality_v0 !prof !14 {
;; Check that all code reachable from ehpad is split out with cycles.
; MFS-EH-SPLIT-LABEL: foo12
; MFS-EH-SPLIT: .section .text.split.foo12,"ax",@progbits
; MFS-EH-SPLIT-NEXT: foo12.cold:
; MFS-EH-SPLIT: callq bar
; MFS-EH-SPLIT: callq baz
; MFS-EH-SPLIT: callq qux
entry:
invoke void @_Z1fv()
to label %8 unwind label %lpad
lpad:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
br label %2
2: ; preds = lpad
%3 = call i32 @bar()
br i1 %0, label %4, label %6
4: ; preds = lpad
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
br i1 %0, label %2, label %8
8: ; preds = %6
ret i32 0
}
define i32 @foo13(i1 zeroext %0) personality ptr @__gxx_personality_v0 !prof !14{
;; Check that all code reachable from EH
;; that is also reachable from outside EH pad
;; is not touched.
; MFS-EH-SPLIT-LABEL: foo13
; MFS-EH-SPLIT: callq bam
; MFS-EH-SPLIT: .section .text.split.foo13,"ax",@progbits
; MFS-EH-SPLIT-NEXT: foo13.cold:
; MFS-EH-SPLIT: callq baz
; MFS-EH-SPLIT: callq bar
; MFS-EH-SPLIT: callq qux
entry:
invoke void @_Z1fv()
to label %try.cont unwind label %lpad, !prof !17
lpad:
%1 = landingpad { ptr, i32 }
cleanup
catch ptr @_ZTIi
br i1 %0, label %2, label %4, !prof !17
2: ; preds = lpad
%3 = call i32 @bar()
br label %6
4: ; preds = lpad
%5 = call i32 @baz()
br label %6
6: ; preds = %4, %2
%7 = tail call i32 @qux()
br i1 %0, label %2, label %try.cont, !prof !17
try.cont: ; preds = %entry
%8 = call i32 @bam()
ret i32 %8
}
declare i32 @bar()
declare i32 @baz()
declare i32 @bam()
declare i32 @qux()
declare void @_Z1fv()
declare i32 @__gxx_personality_v0(...)
@_ZTIi = external constant ptr
attributes #0 = { "implicit-section-name"="nosplit" }
!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}
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