llvm/test/Transforms/DropUnnecessaryAssumes/dereferenceable.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes='drop-unnecessary-assumes' -S %s | FileCheck %s
; RUN: opt -passes='drop-unnecessary-assumes<drop-deref>' -S %s | FileCheck --check-prefix=DROP-DEREF %s

declare void @use(ptr)

define i8 @test_dereferenceable_assume_ptr_not_used(ptr %p, i64 %size) {
; CHECK-LABEL: define i8 @test_dereferenceable_assume_ptr_not_used(
; CHECK-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 [[SIZE]]) ]
; CHECK-NEXT:    ret i8 0
;
; DROP-DEREF-LABEL: define i8 @test_dereferenceable_assume_ptr_not_used(
; DROP-DEREF-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; DROP-DEREF-NEXT:    ret i8 0
;
  call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %p, i64 %size) ]
  ret i8 0
}

define i8 @test_dereferenceable_assume_ptr_used_variable_size(ptr %p, i64 %size) {
; CHECK-LABEL: define i8 @test_dereferenceable_assume_ptr_used_variable_size(
; CHECK-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 [[SIZE]]) ]
; CHECK-NEXT:    [[VAL:%.*]] = load i8, ptr [[P]], align 1
; CHECK-NEXT:    ret i8 [[VAL]]
;
; DROP-DEREF-LABEL: define i8 @test_dereferenceable_assume_ptr_used_variable_size(
; DROP-DEREF-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; DROP-DEREF-NEXT:    [[VAL:%.*]] = load i8, ptr [[P]], align 1
; DROP-DEREF-NEXT:    ret i8 [[VAL]]
;
  call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %p, i64 %size) ]
  %val = load i8, ptr %p
  ret i8 %val
}

define i8 @test_dereferenceable_with_align_ptr_used(ptr %p, i64 %size) {
; CHECK-LABEL: define i8 @test_dereferenceable_with_align_ptr_used(
; CHECK-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; CHECK-NEXT:    call void @llvm.assume(i1 true) [ "dereferenceable"(ptr [[P]], i64 [[SIZE]]), "align"(ptr [[P]], i64 8) ]
; CHECK-NEXT:    [[VAL:%.*]] = load i8, ptr [[P]], align 1
; CHECK-NEXT:    ret i8 [[VAL]]
;
; DROP-DEREF-LABEL: define i8 @test_dereferenceable_with_align_ptr_used(
; DROP-DEREF-SAME: ptr [[P:%.*]], i64 [[SIZE:%.*]]) {
; DROP-DEREF-NEXT:    call void @llvm.assume(i1 true) [ "align"(ptr [[P]], i64 8) ]
; DROP-DEREF-NEXT:    [[VAL:%.*]] = load i8, ptr [[P]], align 1
; DROP-DEREF-NEXT:    ret i8 [[VAL]]
;
  call void @llvm.assume(i1 true) [ "dereferenceable"(ptr %p, i64 %size), "align"(ptr %p, i64 8) ]
  %val = load i8, ptr %p
  ret i8 %val
}