; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s

declare i1 @cond()
declare void @clobber()


define void @test_unreachable_latch(ptr %start, ptr %b) {
; CHECK-LABEL: define void @test_unreachable_latch
; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
; CHECK-NEXT:    br i1 [[C_0]], label [[THEN:%.*]], label [[EXIT:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @clobber()
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       if:
; CHECK-NEXT:    [[C_2:%.*]] = icmp ne ptr [[B]], null
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_0]]
; CHECK-NEXT:    br i1 [[AND]], label [[THEN]], label [[EXIT]]
; CHECK:       then:
; CHECK-NEXT:    call void @clobber()
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:
  %node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
  %c.0 = icmp ne ptr %node.1, null
  br i1 %c.0, label %then, label %exit

loop.latch:                                     ; No predecessors!
  call void @clobber()
  br label %loop.header

if:
  %c.2 = icmp ne ptr %b, null
  %and = and i1 %c.2, %c.0
  br i1 %and, label %then, label %exit

then:
  call void @clobber()
  br label %exit

exit:
  ret void
}

define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact(ptr %start, ptr %b) {
; CHECK-LABEL: define void @test_cond_multi_use_with_one_use_simplified_before_adding_ne_fact
; CHECK-SAME: (ptr [[START:%.*]], ptr [[B:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[NODE_1:%.*]] = phi ptr [ [[START]], [[ENTRY:%.*]] ], [ null, [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = icmp ne ptr [[NODE_1]], null
; CHECK-NEXT:    br i1 [[C_0]], label [[LOOP_LATCH]], label [[EXIT:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[IF:%.*]], label [[LOOP_HEADER]]
; CHECK:       if:
; CHECK-NEXT:    [[C_2:%.*]] = icmp ne ptr [[B]], null
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], true
; CHECK-NEXT:    br i1 [[AND]], label [[THEN:%.*]], label [[EXIT]]
; CHECK:       then:
; CHECK-NEXT:    call void @clobber()
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop.header

loop.header:
  %node.1 = phi ptr [ %start, %entry ], [ null, %loop.latch ]
  %c.0 = icmp ne ptr %node.1, null
  br i1 %c.0, label %loop.latch, label %exit

loop.latch:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %if, label %loop.header

if:
  %c.2 = icmp ne ptr %b, null
  %and = and i1 %c.2, %c.0
  br i1 %and, label %then, label %exit

then:
  call void @clobber()
  br label %exit

exit:
  ret void
}