test/Transforms/DeadStoreElimination/captures.ll

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

declare ptr @passthrough(ptr)

define i16 @ret_only() {
; CHECK-LABEL: define i16 @ret_only() {
; CHECK-NEXT:    [[A:%.*]] = alloca i16, align 1
; CHECK-NEXT:    store i16 1, ptr [[A]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @passthrough(ptr readnone captures(ret: address, provenance) [[A]])
; CHECK-NEXT:    [[V:%.*]] = load i16, ptr [[CALL]], align 1
; CHECK-NEXT:    ret i16 [[V]]
;
  %a = alloca i16, align 1
  store i16 1, ptr %a, align 1
  %call = call ptr @passthrough(ptr readnone captures(ret: address, provenance) %a)
  %v = load i16, ptr %call, align 1
  ret i16 %v
}

define i16 @ret_has_more_components() {
; CHECK-LABEL: define i16 @ret_has_more_components() {
; CHECK-NEXT:    [[A:%.*]] = alloca i16, align 1
; CHECK-NEXT:    store i16 1, ptr [[A]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @passthrough(ptr readnone captures(address, ret: address, provenance) [[A]])
; CHECK-NEXT:    [[V:%.*]] = load i16, ptr [[CALL]], align 1
; CHECK-NEXT:    ret i16 [[V]]
;
  %a = alloca i16, align 1
  store i16 1, ptr %a, align 1
  %call = call ptr @passthrough(ptr readnone captures(address, ret: address, provenance) %a)
  %v = load i16, ptr %call, align 1
  ret i16 %v
}

; Okay to drop the store as only the address of %a is captured, so the load
; cannot be accessing %a.
define i16 @address_capture() {
; CHECK-LABEL: define i16 @address_capture() {
; CHECK-NEXT:    [[A:%.*]] = alloca i16, align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @passthrough(ptr readnone captures(address) [[A]])
; CHECK-NEXT:    [[V:%.*]] = load i16, ptr [[CALL]], align 1
; CHECK-NEXT:    ret i16 [[V]]
;
  %a = alloca i16, align 1
  store i16 1, ptr %a, align 1
  %call = call ptr @passthrough(ptr readnone captures(address) %a)
  %v = load i16, ptr %call, align 1
  ret i16 %v
}

define i16 @read_only_capture() {
; CHECK-LABEL: define i16 @read_only_capture() {
; CHECK-NEXT:    [[A:%.*]] = alloca i16, align 1
; CHECK-NEXT:    store i16 1, ptr [[A]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @passthrough(ptr readnone captures(address, read_provenance) [[A]])
; CHECK-NEXT:    [[V:%.*]] = load i16, ptr [[CALL]], align 1
; CHECK-NEXT:    ret i16 [[V]]
;
  %a = alloca i16, align 1
  store i16 1, ptr %a, align 1
  %call = call ptr @passthrough(ptr readnone captures(address, read_provenance) %a)
  %v = load i16, ptr %call, align 1
  ret i16 %v
}