test/Examples/IRTransforms/SimplifyCFG/tut-simplify-cfg3-phis.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -tut-simplifycfg -tut-simplifycfg-version=v1 -enable-new-pm=0 -S < %s | FileCheck %s
; RUN: opt -tut-simplifycfg -tut-simplifycfg-version=v2 -enable-new-pm=0 -S < %s | FileCheck %s
; RUN: opt -tut-simplifycfg -tut-simplifycfg-version=v3 -enable-new-pm=0 -S < %s | FileCheck %s

define i32 @phi_cond_branch_eliminated() {
; CHECK-LABEL: @phi_cond_branch_eliminated(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    ret i32 20
;
entry:
  br i1 true, label %bb.2, label %bb.3

bb.2:
  br label %bb.3

bb.3:
  %ret = phi i32 [ 10, %entry ], [ 20, %bb.2 ]
  ret i32 %ret
}

define i32 @phi_removed() {
; CHECK-LABEL: @phi_removed(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[BB_3:%.*]]
; CHECK:       bb.3:
; CHECK-NEXT:    ret i32 0
;
entry:
  br i1 false, label %bb.2, label %bb.3

bb.2:
  %pv = phi i32 [ 10, %entry ]
  br label %bb.3

bb.3:
  ret i32 0
}

define i32 @phi_in_dead_region() {
; CHECK-LABEL: @phi_in_dead_region(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    ret i32 1
;
entry:
  ret i32 1

bb.1:
  br i1 true, label %bb.2, label %bb.3

bb.2:
  br label %bb.3

bb.3:
  %ret = phi i32 [ 10, %bb.1 ], [ 20, %bb.2 ]
  ret i32 %ret
}

define i32 @phi_in_mergable_blocks() {
; CHECK-LABEL: @phi_in_mergable_blocks(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    ret i32 10
;
entry:
  br label %bb.1

bb.1:
  %pv = phi i32 [ 10, %entry ]
  ret i32 %pv
}