; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -passes=gvn -S | FileCheck %s

; loop.then is not reachable from loop, so we should be able to deduce that the
; store through %phi2 cannot alias %ptr1.
define void @test1(ptr %ptr1, ptr %ptr2) {
; CHECK-LABEL: define void @test1(
; CHECK-SAME: ptr [[PTR1:%.*]], ptr [[PTR2:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[GEP1:%.*]] = getelementptr inbounds i32, ptr [[PTR1]], i64 1
; CHECK-NEXT:    [[VAL1_PRE:%.*]] = load i32, ptr [[GEP1]], align 4
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[PHI1:%.*]] = phi ptr [ [[GEP1]], %[[ENTRY]] ], [ [[PHI2:%.*]], %[[LOOP_THEN:.*]] ]
; CHECK-NEXT:    br i1 false, label %[[LOOP_LOOP_THEN_CRIT_EDGE:.*]], label %[[LOOP_IF:.*]]
; CHECK:       [[LOOP_LOOP_THEN_CRIT_EDGE]]:
; CHECK-NEXT:    br label %[[LOOP_THEN]]
; CHECK:       [[LOOP_IF]]:
; CHECK-NEXT:    [[GEP2:%.*]] = getelementptr inbounds i32, ptr [[GEP1]], i64 1
; CHECK-NEXT:    [[VAL2:%.*]] = load i32, ptr [[GEP2]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[VAL1_PRE]], [[VAL2]]
; CHECK-NEXT:    br label %[[LOOP_THEN]]
; CHECK:       [[LOOP_THEN]]:
; CHECK-NEXT:    [[PHI2]] = phi ptr [ poison, %[[LOOP_LOOP_THEN_CRIT_EDGE]] ], [ [[GEP2]], %[[LOOP_IF]] ]
; CHECK-NEXT:    store i32 [[VAL1_PRE]], ptr [[PHI2]], align 4
; CHECK-NEXT:    store i32 0, ptr [[PTR1]], align 4
; CHECK-NEXT:    br label %[[LOOP]]
;
entry:
  br label %loop.preheader

loop.preheader:
  %gep1 = getelementptr inbounds i32, ptr %ptr1, i64 1
  br label %loop

loop:
  %phi1 = phi ptr [ %gep1, %loop.preheader ], [ %phi2, %loop.then ]
  %val1 = load i32, ptr %phi1
  br i1 false, label %loop.then, label %loop.if

loop.if:
  %gep2 = getelementptr inbounds i32, ptr %gep1, i64 1
  %val2 = load i32, ptr %gep2
  %cmp = icmp slt i32 %val1, %val2
  br label %loop.then

loop.then:
  %phi2 = phi ptr [ %ptr2, %loop ], [ %gep2, %loop.if ]
  store i32 %val1, ptr %phi2
  store i32 0, ptr %ptr1
  br label %loop
}