llvm/test/Transforms/HotColdSplit/musttail.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes=hotcoldsplit -hotcoldsplit-threshold=0 -S < %s | FileCheck %s

; musttail calls can't be outlined, because they have several restrictions
; enforcing matching calling conventions between the parent and callee.

define void @test_musttail(i1 %b) {
; CHECK-LABEL: define void @test_musttail(
; CHECK-SAME: i1 [[B:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 [[B]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    ret void
; CHECK:       [[IF_ELSE]]:
; CHECK-NEXT:    musttail call void @target(i1 [[B]])
; CHECK-NEXT:    ret void
;
entry:
  br i1 %b, label %if.then, label %if.else

if.then:
  ret void

if.else:
  musttail call void @target(i1 %b)
  ret void
}

define void @test_tail(i1 %b) {
; CHECK-LABEL: define void @test_tail(
; CHECK-SAME: i1 [[B:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 [[B]], label %[[IF_THEN:.*]], label %[[CODEREPL:.*]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    ret void
; CHECK:       [[CODEREPL]]:
; CHECK-NEXT:    call void @test_tail.cold.1(i1 [[B]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT:    br label %[[IF_ELSE_RET:.*]]
; CHECK:       [[IF_ELSE_RET]]:
; CHECK-NEXT:    ret void
;
entry:
  br i1 %b, label %if.then, label %if.else

if.then:
  ret void

if.else:
  tail call void @target(i1 %b)
  ret void
}

declare void @target() cold