llvm/test/Transforms/SimplifyCFG/tail-merge-resume.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -sink-common-insts  -S < %s | FileCheck %s

; Test that we tail merge resume blocks and phi operands properly.

declare void @maybe_throws()
declare void @foo()
declare void @bar()
declare void @baz()
declare void @qux()
declare void @quux()
declare void @quuz()
declare void @common()

define void @merge_simple(i1 %cond) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-LABEL: @merge_simple(
; CHECK-NEXT:    invoke void @maybe_throws()
; CHECK-NEXT:    to label [[INVOKE_CONT:%.*]] unwind label [[LPAD:%.*]]
; CHECK:       invoke.cont:
; CHECK-NEXT:    invoke void @maybe_throws()
; CHECK-NEXT:    to label [[INVOKE_CONT2:%.*]] unwind label [[LPAD2:%.*]]
; CHECK:       invoke.cont2:
; CHECK-NEXT:    invoke void @maybe_throws()
; CHECK-NEXT:    to label [[INVOKE_CONT3:%.*]] unwind label [[LPAD3:%.*]]
; CHECK:       invoke.cont3:
; CHECK-NEXT:    ret void
; CHECK:       lpad:
; CHECK-NEXT:    [[LP:%.*]] = landingpad { i8*, i32 }
; CHECK-NEXT:    cleanup
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br i1 [[COND:%.*]], label [[RESUME0:%.*]], label [[RESUME1:%.*]]
; CHECK:       lpad2:
; CHECK-NEXT:    [[LP2:%.*]] = landingpad { i8*, i32 }
; CHECK-NEXT:    cleanup
; CHECK-NEXT:    call void @bar()
; CHECK-NEXT:    br label [[RESUME2:%.*]]
; CHECK:       lpad3:
; CHECK-NEXT:    [[LP3:%.*]] = landingpad { i8*, i32 }
; CHECK-NEXT:    cleanup
; CHECK-NEXT:    call void @baz()
; CHECK-NEXT:    br label [[RESUME2]]
; CHECK:       common.resume:
; CHECK-NEXT:    [[COMMON_RESUME_OP:%.*]] = phi { i8*, i32 } [ [[LP]], [[RESUME0]] ], [ [[LP]], [[RESUME1]] ], [ [[SEMICOMMON_LP:%.*]], [[RESUME2]] ]
; CHECK-NEXT:    call void @common()
; CHECK-NEXT:    resume { i8*, i32 } [[COMMON_RESUME_OP]]
; CHECK:       resume0:
; CHECK-NEXT:    call void @qux()
; CHECK-NEXT:    br label [[COMMON_RESUME:%.*]]
; CHECK:       resume1:
; CHECK-NEXT:    call void @quux()
; CHECK-NEXT:    br label [[COMMON_RESUME]]
; CHECK:       resume2:
; CHECK-NEXT:    [[SEMICOMMON_LP]] = phi { i8*, i32 } [ [[LP2]], [[LPAD2]] ], [ [[LP3]], [[LPAD3]] ]
; CHECK-NEXT:    call void @quuz()
; CHECK-NEXT:    br label [[COMMON_RESUME]]
;
  invoke void @maybe_throws() to label %invoke.cont unwind label %lpad

invoke.cont:
  invoke void @maybe_throws() to label %invoke.cont2 unwind label %lpad2

invoke.cont2:
  invoke void @maybe_throws() to label %invoke.cont3 unwind label %lpad3

invoke.cont3:
  ret void

lpad:
  %lp = landingpad { i8*, i32 } cleanup
  call void @foo()
  br i1 %cond, label %resume0, label %resume1

lpad2:
  %lp2 = landingpad { i8*, i32 } cleanup
  call void @bar()
  br label %resume2

lpad3:
  %lp3 = landingpad { i8*, i32 } cleanup
  call void @baz()
  br label %resume2

resume0:
  call void @qux()
  call void @common()
  resume { i8*, i32 } %lp

resume1:
  call void @quux()
  call void @common()
  resume { i8*, i32 } %lp

resume2:
  %semicommon.lp = phi { i8*, i32 } [ %lp2, %lpad2 ], [ %lp3, %lpad3 ]
  call void @quuz()
  call void @common()
  resume { i8*, i32 } %semicommon.lp
}

declare dso_local i32 @__gxx_personality_v0(...)