mirror of https://github.com/rust-lang/rust
52 lines
1.0 KiB
Rust
52 lines
1.0 KiB
Rust
//@ revisions: DEBUG OPTIM
|
|
//@ [DEBUG] compile-flags: -C opt-level=0
|
|
//@ [OPTIM] compile-flags: -C opt-level=3
|
|
//@ assembly-output: emit-asm
|
|
//@ compile-flags: --crate-type=lib -C llvm-args=-x86-asm-syntax=intel
|
|
//@ only-x86_64
|
|
//@ ignore-sgx
|
|
|
|
#![feature(core_intrinsics)]
|
|
|
|
use std::intrinsics::three_way_compare;
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: signed_cmp:
|
|
pub fn signed_cmp(a: i16, b: i16) -> std::cmp::Ordering {
|
|
// DEBUG: cmp
|
|
// DEBUG: setg
|
|
// DEBUG: and
|
|
// DEBUG: cmp
|
|
// DEBUG: setl
|
|
// DEBUG: and
|
|
// DEBUG: sub
|
|
|
|
// OPTIM: xor
|
|
// OPTIM: cmp
|
|
// OPTIM: setne
|
|
// OPTIM: mov
|
|
// OPTIM: cmovge
|
|
// OPTIM: ret
|
|
three_way_compare(a, b)
|
|
}
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: unsigned_cmp:
|
|
pub fn unsigned_cmp(a: u16, b: u16) -> std::cmp::Ordering {
|
|
// DEBUG: cmp
|
|
// DEBUG: seta
|
|
// DEBUG: and
|
|
// DEBUG: cmp
|
|
// DEBUG: setb
|
|
// DEBUG: and
|
|
// DEBUG: sub
|
|
|
|
// OPTIM: xor
|
|
// OPTIM: cmp
|
|
// OPTIM: setne
|
|
// OPTIM: mov
|
|
// OPTIM: cmovae
|
|
// OPTIM: ret
|
|
three_way_compare(a, b)
|
|
}
|