mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-02 15:32:06 +00:00
37 lines
1.0 KiB
Rust
37 lines
1.0 KiB
Rust
// compile-flags: -C opt-level=1
|
|
// only-64bit (because we're using [ui]size)
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(core_intrinsics)]
|
|
|
|
//! Basic optimizations are enabled because otherwise `x86_64-gnu-nopt` had an alloca.
|
|
//! Uses a type with non-power-of-two size to avoid normalizations to shifts.
|
|
|
|
use std::intrinsics::*;
|
|
|
|
type RGB = [u8; 3];
|
|
|
|
// CHECK-LABEL: @offset_from_odd_size
|
|
#[no_mangle]
|
|
pub unsafe fn offset_from_odd_size(a: *const RGB, b: *const RGB) -> isize {
|
|
// CHECK: start
|
|
// CHECK-NEXT: ptrtoint
|
|
// CHECK-NEXT: ptrtoint
|
|
// CHECK-NEXT: sub i64
|
|
// CHECK-NEXT: sdiv exact i64 %{{[0-9]+}}, 3
|
|
// CHECK-NEXT: ret i64
|
|
ptr_offset_from(a, b)
|
|
}
|
|
|
|
// CHECK-LABEL: @offset_from_unsigned_odd_size
|
|
#[no_mangle]
|
|
pub unsafe fn offset_from_unsigned_odd_size(a: *const RGB, b: *const RGB) -> usize {
|
|
// CHECK: start
|
|
// CHECK-NEXT: ptrtoint
|
|
// CHECK-NEXT: ptrtoint
|
|
// CHECK-NEXT: sub nuw i64
|
|
// CHECK-NEXT: udiv exact i64 %{{[0-9]+}}, 3
|
|
// CHECK-NEXT: ret i64
|
|
ptr_offset_from_unsigned(a, b)
|
|
}
|