src/test/codegen/loads.rs

   1 // compile-flags: -C no-prepopulate-passes -Zmir-opt-level=0
   2
   3 #![crate_type = "lib"]
   4
   5 use std::mem::MaybeUninit;
   6 use std::num::NonZeroU16;
   7
   8 pub struct Bytes {
   9     a: u8,
  10     b: u8,
  11     c: u8,
  12     d: u8,
  13 }
  14
  15 #[derive(Copy, Clone)]
  16 pub enum MyBool {
  17     True,
  18     False,
  19 }
  20
  21 #[repr(align(16))]
  22 pub struct Align16(u128);
  23
  24 // CHECK: @ptr_alignment_helper({}** {{.*}}align [[PTR_ALIGNMENT:[0-9]+]]
  25 #[no_mangle]
  26 pub fn ptr_alignment_helper(x: &&()) {}
  27
  28 // CHECK-LABEL: @load_ref
  29 #[no_mangle]
  30 pub fn load_ref<'a>(x: &&'a i32) -> &'a i32 {
  31 // CHECK: load i32*, i32** %x, align [[PTR_ALIGNMENT]], !nonnull !{{[0-9]+}}, !align ![[ALIGN_4_META:[0-9]+]], !noundef !{{[0-9]+}}
  32     *x
  33 }
  34
  35 // CHECK-LABEL: @load_ref_higher_alignment
  36 #[no_mangle]
  37 pub fn load_ref_higher_alignment<'a>(x: &&'a Align16) -> &'a Align16 {
  38 // CHECK: load {{%Align16|i128}}*, {{%Align16|i128}}** %x, align [[PTR_ALIGNMENT]], !nonnull !{{[0-9]+}}, !align ![[ALIGN_16_META:[0-9]+]], !noundef !{{[0-9]+}}
  39     *x
  40 }
  41
  42 // CHECK-LABEL: @load_scalar_pair
  43 #[no_mangle]
  44 pub fn load_scalar_pair<'a>(x: &(&'a i32, &'a Align16)) -> (&'a i32, &'a Align16) {
  45 // CHECK: load i32*, i32** %{{.+}}, align [[PTR_ALIGNMENT]], !nonnull !{{[0-9]+}}, !align ![[ALIGN_4_META]], !noundef !{{[0-9]+}}
  46 // CHECK: load i64*, i64** %{{.+}}, align [[PTR_ALIGNMENT]], !nonnull !{{[0-9]+}}, !align ![[ALIGN_16_META]], !noundef !{{[0-9]+}}
  47     *x
  48 }
  49
  50 // CHECK-LABEL: @load_raw_pointer
  51 #[no_mangle]
  52 pub fn load_raw_pointer<'a>(x: &*const i32) -> *const i32 {
  53 // loaded raw pointer should not have !nonnull, !align, or !noundef metadata
  54 // CHECK: load i32*, i32** %x, align [[PTR_ALIGNMENT]]{{$}}
  55     *x
  56 }
  57
  58 // CHECK-LABEL: @load_box
  59 #[no_mangle]
  60 pub fn load_box<'a>(x: Box<Box<i32>>) -> Box<i32> {
  61 // CHECK: load i32*, i32** %x, align [[PTR_ALIGNMENT]], !nonnull !{{[0-9]+}}, !align ![[ALIGN_4_META]], !noundef !{{[0-9]+}}
  62     *x
  63 }
  64
  65 // CHECK-LABEL: @load_bool
  66 #[no_mangle]
  67 pub fn load_bool(x: &bool) -> bool {
  68 // CHECK: load i8, i8* %x, align 1, !range ![[BOOL_RANGE:[0-9]+]], !noundef !{{[0-9]+}}
  69     *x
  70 }
  71
  72 // CHECK-LABEL: @load_maybeuninit_bool
  73 #[no_mangle]
  74 pub fn load_maybeuninit_bool(x: &MaybeUninit<bool>) -> MaybeUninit<bool> {
  75 // CHECK: load i8, i8* %x, align 1{{$}}
  76     *x
  77 }
  78
  79 // CHECK-LABEL: @load_enum_bool
  80 #[no_mangle]
  81 pub fn load_enum_bool(x: &MyBool) -> MyBool {
  82 // CHECK: load i8, i8* %x, align 1, !range ![[BOOL_RANGE]], !noundef !{{[0-9]+}}
  83     *x
  84 }
  85
  86 // CHECK-LABEL: @load_maybeuninit_enum_bool
  87 #[no_mangle]
  88 pub fn load_maybeuninit_enum_bool(x: &MaybeUninit<MyBool>) -> MaybeUninit<MyBool> {
  89 // CHECK: load i8, i8* %x, align 1{{$}}
  90     *x
  91 }
  92
  93 // CHECK-LABEL: @load_int
  94 #[no_mangle]
  95 pub fn load_int(x: &u16) -> u16 {
  96 // CHECK: load i16, i16* %x, align 2{{$}}
  97     *x
  98 }
  99
 100 // CHECK-LABEL: @load_nonzero_int
 101 #[no_mangle]
 102 pub fn load_nonzero_int(x: &NonZeroU16) -> NonZeroU16 {
 103 // CHECK: load i16, i16* %x, align 2, !range ![[NONZEROU16_RANGE:[0-9]+]], !noundef !{{[0-9]+}}
 104     *x
 105 }
 106
 107 // CHECK-LABEL: @load_option_nonzero_int
 108 #[no_mangle]
 109 pub fn load_option_nonzero_int(x: &Option<NonZeroU16>) -> Option<NonZeroU16> {
 110 // CHECK: load i16, i16* %x, align 2{{$}}
 111     *x
 112 }
 113
 114 // CHECK-LABEL: @borrow
 115 #[no_mangle]
 116 pub fn borrow(x: &i32) -> &i32 {
 117 // CHECK: load {{(i32\*, )?}}i32** %x{{.*}}, !nonnull
 118     &x; // keep variable in an alloca
 119     x
 120 }
 121
 122 // CHECK-LABEL: @_box
 123 #[no_mangle]
 124 pub fn _box(x: Box<i32>) -> i32 {
 125 // CHECK: load {{(i32\*, )?}}i32** %x{{.*}}, !nonnull
 126     *x
 127 }
 128
 129 // CHECK-LABEL: small_array_alignment
 130 // The array is loaded as i32, but its alignment is lower, go with 1 byte to avoid target
 131 // dependent alignment
 132 #[no_mangle]
 133 pub fn small_array_alignment(x: [i8; 4]) -> [i8; 4] {
 134 // CHECK: [[VAR:%[0-9]+]] = load {{(i32, )?}}i32* %{{.*}}, align 1
 135 // CHECK: ret i32 [[VAR]]
 136     x
 137 }
 138
 139 // CHECK-LABEL: small_struct_alignment
 140 // The struct is loaded as i32, but its alignment is lower, go with 1 byte to avoid target
 141 // dependent alignment
 142 #[no_mangle]
 143 pub fn small_struct_alignment(x: Bytes) -> Bytes {
 144 // CHECK: [[VAR:%[0-9]+]] = load {{(i32, )?}}i32* %{{.*}}, align 1
 145 // CHECK: ret i32 [[VAR]]
 146     x
 147 }
 148
 149 // CHECK-DAG: ![[BOOL_RANGE]] = !{i8 0, i8 2}
 150 // CHECK-DAG: ![[NONZEROU16_RANGE]] = !{i16 1, i16 0}
 151 // CHECK-DAG: ![[ALIGN_4_META]] = !{i64 4}
 152 // CHECK-DAG: ![[ALIGN_16_META]] = !{i64 16}