1
Fork 0

Copy 1-element arrays as scalars, not vectors

For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.
This commit is contained in:
Scott McMurray 2023-10-06 01:17:09 -07:00
parent 579be69de9
commit ae9cec5839
4 changed files with 80 additions and 1 deletions

View file

@ -32,3 +32,25 @@ pub fn array_copy(a: &[u8; 4], p: &mut [u8; 4]) {
// CHECK: store <4 x i8> %[[TEMP2]], ptr %p, align 1
*p = *a;
}
// CHECK-LABEL: @array_copy_1_element
#[no_mangle]
pub fn array_copy_1_element(a: &[u8; 1], p: &mut [u8; 1]) {
// CHECK: %[[LOCAL:.+]] = alloca [1 x i8], align 1
// CHECK: %[[TEMP1:.+]] = load i8, ptr %a, align 1
// CHECK: store i8 %[[TEMP1]], ptr %[[LOCAL]], align 1
// CHECK: %[[TEMP2:.+]] = load i8, ptr %[[LOCAL]], align 1
// CHECK: store i8 %[[TEMP2]], ptr %p, align 1
*p = *a;
}
// CHECK-LABEL: @array_copy_2_elements
#[no_mangle]
pub fn array_copy_2_elements(a: &[u8; 2], p: &mut [u8; 2]) {
// CHECK: %[[LOCAL:.+]] = alloca [2 x i8], align 1
// CHECK: %[[TEMP1:.+]] = load <2 x i8>, ptr %a, align 1
// CHECK: store <2 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1
// CHECK: %[[TEMP2:.+]] = load <2 x i8>, ptr %[[LOCAL]], align 1
// CHECK: store <2 x i8> %[[TEMP2]], ptr %p, align 1
*p = *a;
}