; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes='loop-mssa(licm)' < %s -S | FileCheck %s

;; It should hoist fn_write_inaccessible_mem
;; because there is no conflict between inaccessible memory
;; fn_read_inaccessible_mem is a nice side effect
define i32 @loop_alias(i64 %x, ptr %start) {
; CHECK-LABEL: define i32 @loop_alias(
; CHECK-SAME: i64 [[X:%.*]], ptr [[START:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[GEP:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[LOAD:%.*]] = load i32, ptr [[PHI]], align 4
; CHECK-NEXT:    [[VAL:%.*]] = call i32 @fn_args(i32 [[LOAD]])
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 [[LOAD]])
; CHECK-NEXT:    [[GEP]] = getelementptr inbounds nuw i32, ptr [[PHI]], i64 [[X]]
; CHECK-NEXT:    [[ACC:%.*]] = add nuw nsw i32 [[VAL]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[ACC]], 10
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP]], label %[[AFTER_LOOP:.*]]
; CHECK:       [[AFTER_LOOP]]:
; CHECK-NEXT:    [[ACC_LCSSA:%.*]] = phi i32 [ [[ACC]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[ACC_LCSSA]]
;
entry:
  br label %loop
loop:
  %phi = phi ptr [ %start, %entry ], [ %gep, %loop ]
  %load = load i32, ptr %phi
  %val = call i32 @fn_args(i32 %load)
  call void @fn_write_inaccessible_mem()
  call void @fn_read_inaccessible_mem(i32 %load)
  %gep = getelementptr inbounds nuw i32, ptr %phi, i64 %x
  %acc = add nuw nsw i32 %val, 1
  %cmp = icmp ult i32 %acc, 10
  br i1 %cmp, label %loop, label %after_loop
after_loop:
  ret i32 %acc
}

;; It should NOT hoist fn_write_inaccessible_mem
;; Because fn_read_inaccessible_mem_2 reads the same inaccessible memory
define i32 @ne_loop_alias(i64 %x, ptr %start) {
; CHECK-LABEL: define i32 @ne_loop_alias(
; CHECK-SAME: i64 [[X:%.*]], ptr [[START:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[GEP:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[LOAD:%.*]] = load i32, ptr [[PHI]], align 4
; CHECK-NEXT:    [[VAL:%.*]] = call i32 @fn_read_inaccessible_mem_2(i32 [[LOAD]])
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 [[VAL]])
; CHECK-NEXT:    [[GEP]] = getelementptr inbounds nuw i32, ptr [[PHI]], i64 [[X]]
; CHECK-NEXT:    [[ACC:%.*]] = add nuw nsw i32 [[VAL]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[ACC]], 10
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP]], label %[[AFTER_LOOP:.*]]
; CHECK:       [[AFTER_LOOP]]:
; CHECK-NEXT:    [[ACC_LCSSA:%.*]] = phi i32 [ [[ACC]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[ACC_LCSSA]]
;
entry:
  br label %loop
loop:
  %phi = phi ptr [ %start, %entry ], [ %gep, %loop ]
  %load = load i32, ptr %phi
  %val = call i32 @fn_read_inaccessible_mem_2(i32 %load)
  call void @fn_write_inaccessible_mem()
  call void @fn_read_inaccessible_mem(i32 %val)
  %gep = getelementptr inbounds nuw i32, ptr %phi, i64 %x
  %acc = add nuw nsw i32 %val, 1
  %cmp = icmp ult i32 %acc, 10
  br i1 %cmp, label %loop, label %after_loop
after_loop:
  ret i32 %acc
}

;; Should hoist fn_write_inaccessible_mem
;; It does not alias with store
define void @hoist_untill_I(ptr noalias %loc, ptr noalias %loc2){
; CHECK-LABEL: define void @hoist_untill_I(
; CHECK-SAME: ptr noalias [[LOC:%.*]], ptr noalias [[LOC2:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[VAL:%.*]] = load i32, ptr [[LOC2]], align 4
; CHECK-NEXT:    store i32 [[VAL]], ptr [[LOC]], align 4
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 [[VAL]])
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_COND_CLEANUP:.*:]]
; CHECK-NEXT:    ret void
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    br label %[[FOR_BODY]]
;
entry:
  br label %for.body
for.cond.cleanup:                                 ; preds = %for.body
  ret void
for.body:
  %val = load i32, ptr %loc2
  store i32 %val, ptr %loc
  call void @fn_write_inaccessible_mem()
  call void @fn_read_inaccessible_mem(i32 %val)
  br label %for.body
}

;; Should NOT hoist fn_write_inaccessible_mem
;; because fn_read_inaccessible_mem reads the same memory location
define void @neg_hoist_untill_I(ptr noalias %loc, ptr noalias %loc2){
; CHECK-LABEL: define void @neg_hoist_untill_I(
; CHECK-SAME: ptr noalias [[LOC:%.*]], ptr noalias [[LOC2:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[VAL:%.*]] = load i32, ptr [[LOC2]], align 4
; CHECK-NEXT:    store i32 [[VAL]], ptr [[LOC]], align 4
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 0)
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 [[VAL]])
; CHECK-NEXT:    br label %[[FOR_BODY]]
;
entry:
  br label %for.body
for.body:
  %val = load i32, ptr %loc2
  store i32 %val, ptr %loc
  call void @fn_read_inaccessible_mem(i32 0)
  call void @fn_write_inaccessible_mem()
  call void @fn_read_inaccessible_mem(i32 %val)
  br label %for.body
}


;; Nothing should be hoisted from the loop because volatile
;; sets inaccessible memory to read write
define void @neg_volatile(ptr %loc, ptr %loc2) {
; CHECK-LABEL: define void @neg_volatile(
; CHECK-SAME: ptr [[LOC:%.*]], ptr [[LOC2:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[VAL:%.*]] = load i32, ptr [[LOC2]], align 4
; CHECK-NEXT:    store volatile i32 0, ptr [[LOC]], align 4
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    call void @fn_read_inaccessible_mem(i32 [[VAL]])
; CHECK-NEXT:    br label %[[LOOP]]
;
entry:
  br label %loop

loop:
  %val = load i32, ptr %loc2
  store volatile i32 0, ptr %loc
  call void @fn_write_inaccessible_mem()
  call void @fn_read_inaccessible_mem(i32 %val)
  br label %loop
}

define i32 @non_dominated_load_that_does_not_alias_inaccessible_mem(ptr %dst, i64 %x, ptr %start) {
; CHECK-LABEL: define i32 @non_dominated_load_that_does_not_alias_inaccessible_mem(
; CHECK-SAME: ptr [[DST:%.*]], i64 [[X:%.*]], ptr [[START:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    call void @fn_write_inaccessible_mem()
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[GEP:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[LOAD:%.*]] = load i32, ptr [[PHI]], align 4
; CHECK-NEXT:    [[VAL:%.*]] = call i32 @fn_args(i32 [[LOAD]])
; CHECK-NEXT:    [[RES:%.*]] = call i32 @fn_read_inaccessible_mem_2(i32 [[LOAD]])
; CHECK-NEXT:    store i32 [[RES]], ptr [[DST]], align 4
; CHECK-NEXT:    [[GEP]] = getelementptr inbounds nuw i32, ptr [[PHI]], i64 [[X]]
; CHECK-NEXT:    [[ACC:%.*]] = add nuw nsw i32 [[VAL]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[ACC]], 10
; CHECK-NEXT:    br i1 [[CMP]], label %[[LOOP]], label %[[AFTER_LOOP:.*]]
; CHECK:       [[AFTER_LOOP]]:
; CHECK-NEXT:    [[ACC_LCSSA:%.*]] = phi i32 [ [[ACC]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[ACC_LCSSA]]
;
entry:
  br label %loop
loop:
  %phi = phi ptr [ %start, %entry ], [ %gep, %loop ]
  %load = load i32, ptr %phi
  %val = call i32 @fn_args(i32 %load)
  call void @fn_write_inaccessible_mem()
  %res = call i32 @fn_read_inaccessible_mem_2(i32 %load)
  store i32 %res, ptr %dst
  %gep = getelementptr inbounds nuw i32, ptr %phi, i64 %x
  %acc = add nuw nsw i32 %val, 1
  %cmp = icmp ult i32 %acc, 10
  br i1 %cmp, label %loop, label %after_loop
after_loop:
  ret i32 %acc
}

declare i32 @fn_args(i32) nounwind willreturn memory(argmem: read)
declare i32 @fn_read_inaccessible_mem_2(i32) nounwind willreturn memory(inaccessiblemem: read)
declare void @fn_write_inaccessible_mem() nounwind memory(inaccessiblemem: write)
declare void @fn_read_inaccessible_mem(i32) nounwind memory(inaccessiblemem: read)
declare void @fn_readwrite_inaccessible_mem() nounwind memory(inaccessiblemem: readwrite)