src/test/codegen/stores.rs

   1 // compile-flags: -C no-prepopulate-passes
   2 // ignore-tidy-linelength
   3
   4 #![crate_type = "lib"]
   5
   6 pub struct Bytes {
   7   a: u8,
   8   b: u8,
   9   c: u8,
  10   d: u8,
  11 }
  12
  13 // CHECK-LABEL: small_array_alignment
  14 // The array is stored as i32, but its alignment is lower, go with 1 byte to avoid target
  15 // dependent alignment
  16 #[no_mangle]
  17 pub fn small_array_alignment(x: &mut [i8; 4], y: [i8; 4]) {
  18 // CHECK: [[TMP:%.+]] = alloca i32
  19 // CHECK: %y = alloca [4 x i8]
  20 // CHECK: store i32 %0, i32* [[TMP]]
  21 // CHECK: [[Y8:%[0-9]+]] = bitcast [4 x i8]* %y to i8*
  22 // CHECK: [[TMP8:%[0-9]+]] = bitcast i32* [[TMP]] to i8*
  23 // CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 [[Y8]], i8* align 4 [[TMP8]], i{{[0-9]+}} 4, i1 false)
  24     *x = y;
  25 }
  26
  27 // CHECK-LABEL: small_struct_alignment
  28 // The struct is stored as i32, but its alignment is lower, go with 1 byte to avoid target
  29 // dependent alignment
  30 #[no_mangle]
  31 pub fn small_struct_alignment(x: &mut Bytes, y: Bytes) {
  32 // CHECK: [[TMP:%.+]] = alloca i32
  33 // CHECK: %y = alloca %Bytes
  34 // CHECK: store i32 %0, i32* [[TMP]]
  35 // CHECK: [[Y8:%[0-9]+]] = bitcast %Bytes* %y to i8*
  36 // CHECK: [[TMP8:%[0-9]+]] = bitcast i32* [[TMP]] to i8*
  37 // CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 [[Y8]], i8* align 4 [[TMP8]], i{{[0-9]+}} 4, i1 false)
  38     *x = y;
  39 }