llvm/test/Transforms/FunctionAttrs/noalias.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes=function-attrs < %s | FileCheck %s

declare noalias ptr @malloc(i64 %size)
declare ptr @not_malloc(i64 %size)
declare void @capture(ptr)

@g = external global i8

define ptr @return_malloc(i64 %size) {
; CHECK-LABEL: define noalias ptr @return_malloc(
; CHECK-SAME: i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr @malloc(i64 %size)
  ret ptr %a
}

define ptr @return_not_malloc(i64 %size) {
; CHECK-LABEL: define ptr @return_not_malloc(
; CHECK-SAME: i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @not_malloc(i64 [[SIZE]])
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr @not_malloc(i64 %size)
  ret ptr %a
}

define ptr @return_null() {
; CHECK-LABEL: define noalias noundef ptr @return_null(
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:    ret ptr null
;
  ret ptr null
}

define ptr @return_poison() {
; CHECK-LABEL: define noalias ptr @return_poison(
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT:    ret ptr poison
;
  ret ptr poison
}

define ptr @return_alloca() {
; CHECK-LABEL: define noalias noundef nonnull ptr @return_alloca(
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT:    [[A:%.*]] = alloca i8, align 1
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = alloca i8
  ret ptr %a
}

; noalias arg does not imply noalias return
define ptr @return_noalias_arg(ptr noalias %arg) {
; CHECK-LABEL: define ptr @return_noalias_arg(
; CHECK-SAME: ptr noalias readnone returned captures(ret: address, provenance) [[ARG:%.*]]) #[[ATTR0]] {
; CHECK-NEXT:    ret ptr [[ARG]]
;
  ret ptr %arg
}

define ptr @return_global() {
; CHECK-LABEL: define noundef nonnull ptr @return_global(
; CHECK-SAME: ) #[[ATTR0]] {
; CHECK-NEXT:    ret ptr @g
;
  ret ptr @g
}

define ptr @no_return() {
; CHECK-LABEL: define noalias noundef nonnull ptr @no_return(
; CHECK-SAME: ) #[[ATTR1:[0-9]+]] {
; CHECK-NEXT:    unreachable
;
  unreachable
}

define ptr @return_multiple(i1 %c, i64 %size) {
; CHECK-LABEL: define noalias ptr @return_multiple(
; CHECK-SAME: i1 [[C:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    br i1 [[C]], label %[[IF:.*]], label %[[ELSE:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    ret ptr [[A]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    [[B:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    ret ptr [[B]]
;
br i1 %c, label %if, label %else

if:
  %a = call ptr @malloc(i64 %size)
  ret ptr %a

else:
  %b = call ptr @malloc(i64 %size)
  ret ptr %b
}

define ptr @return_select(i1 %c, i64 %size) {
; CHECK-LABEL: define noalias ptr @return_select(
; CHECK-SAME: i1 [[C:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[C]], ptr [[A]], ptr null
; CHECK-NEXT:    ret ptr [[SEL]]
;
  %a = call ptr @malloc(i64 %size)
  %sel = select i1 %c, ptr %a, ptr null
  ret ptr %sel
}

define ptr @return_phi(i1 %c, i64 %size) {
; CHECK-LABEL: define noalias ptr @return_phi(
; CHECK-SAME: i1 [[C:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    br i1 [[C]], label %[[IF:.*]], label %[[ELSE:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    br label %[[JOIN:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    br label %[[JOIN]]
; CHECK:       [[JOIN]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[A]], %[[IF]] ], [ null, %[[ELSE]] ]
; CHECK-NEXT:    ret ptr [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  %a = call ptr @malloc(i64 %size)
  br label %join

else:
  br label %join

join:
  %phi = phi ptr [ %a, %if ], [ null, %else ]
  ret ptr %phi
}

define ptr @return_phi_wrong(i1 %c, i64 %size) {
; CHECK-LABEL: define ptr @return_phi_wrong(
; CHECK-SAME: i1 [[C:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    br i1 [[C]], label %[[IF:.*]], label %[[ELSE:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    br label %[[JOIN:.*]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    [[B:%.*]] = call ptr @not_malloc(i64 [[SIZE]])
; CHECK-NEXT:    br label %[[JOIN]]
; CHECK:       [[JOIN]]:
; CHECK-NEXT:    [[PHI:%.*]] = phi ptr [ [[A]], %[[IF]] ], [ [[B]], %[[ELSE]] ]
; CHECK-NEXT:    ret ptr [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  %a = call ptr @malloc(i64 %size)
  br label %join

else:
  %b = call ptr @not_malloc(i64 %size)
  br label %join

join:
  %phi = phi ptr [ %a, %if ], [ %b, %else ]
  ret ptr %phi
}

define ptr @return_malloc_with_store(i64 %size) {
; CHECK-LABEL: define noalias noundef ptr @return_malloc_with_store(
; CHECK-SAME: i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    store i8 0, ptr [[A]], align 1
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr @malloc(i64 %size)
  store i8 0, ptr %a
  ret ptr %a
}

define ptr @return_malloc_captured(i64 %size) {
; CHECK-LABEL: define ptr @return_malloc_captured(
; CHECK-SAME: i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 [[SIZE]])
; CHECK-NEXT:    call void @capture(ptr [[A]])
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr @malloc(i64 %size)
  call void @capture(ptr %a)
  ret ptr %a
}

define ptr @scc1(i1 %c) {
; CHECK-LABEL: define noalias ptr @scc1(
; CHECK-SAME: i1 [[C:%.*]]) {
; CHECK-NEXT:    br i1 [[C]], label %[[IF:.*]], label %[[ELSE:.*]]
; CHECK:       [[IF]]:
; CHECK-NEXT:    [[A:%.*]] = call ptr @malloc(i64 4)
; CHECK-NEXT:    ret ptr [[A]]
; CHECK:       [[ELSE]]:
; CHECK-NEXT:    [[B:%.*]] = call ptr @scc2(i1 [[C]])
; CHECK-NEXT:    ret ptr [[B]]
;
  br i1 %c, label %if, label %else

if:
  %a = call ptr @malloc(i64 4)
  ret ptr %a

else:
  %b = call ptr @scc2(i1 %c)
  ret ptr %b
}

define ptr @scc2(i1 %c) {
; CHECK-LABEL: define noalias ptr @scc2(
; CHECK-SAME: i1 [[C:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr @scc1(i1 [[C]])
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr @scc1(i1 %c)
  ret ptr %a
}

define ptr @return_unknown_call(ptr %fn) {
; CHECK-LABEL: define ptr @return_unknown_call(
; CHECK-SAME: ptr readonly captures(none) [[FN:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call ptr [[FN]]()
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call ptr %fn()
  ret ptr %a
}

define ptr @return_unknown_noalias_call(ptr %fn) {
; CHECK-LABEL: define noalias ptr @return_unknown_noalias_call(
; CHECK-SAME: ptr readonly captures(none) [[FN:%.*]]) {
; CHECK-NEXT:    [[A:%.*]] = call noalias ptr [[FN]]()
; CHECK-NEXT:    ret ptr [[A]]
;
  %a = call noalias ptr %fn()
  ret ptr %a
}