mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
//@ revisions: DEBUG OPTIM
|
|
//@ [DEBUG] compile-flags: -C opt-level=0
|
|
//@ [OPTIM] compile-flags: -C opt-level=3
|
|
//@ compile-flags: -C no-prepopulate-passes
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(core_intrinsics)]
|
|
|
|
use std::intrinsics::three_way_compare;
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: @signed_cmp
|
|
// DEBUG-SAME: (i16 %a, i16 %b)
|
|
// OPTIM-SAME: (i16 noundef %a, i16 noundef %b)
|
|
pub fn signed_cmp(a: i16, b: i16) -> std::cmp::Ordering {
|
|
// DEBUG: %[[GT:.+]] = icmp sgt i16 %a, %b
|
|
// DEBUG: %[[ZGT:.+]] = zext i1 %[[GT]] to i8
|
|
// DEBUG: %[[LT:.+]] = icmp slt i16 %a, %b
|
|
// DEBUG: %[[ZLT:.+]] = zext i1 %[[LT]] to i8
|
|
// DEBUG: %[[R:.+]] = sub nsw i8 %[[ZGT]], %[[ZLT]]
|
|
|
|
// OPTIM: %[[LT:.+]] = icmp slt i16 %a, %b
|
|
// OPTIM: %[[NE:.+]] = icmp ne i16 %a, %b
|
|
// OPTIM: %[[CGE:.+]] = select i1 %[[NE]], i8 1, i8 0
|
|
// OPTIM: %[[CGEL:.+]] = select i1 %[[LT]], i8 -1, i8 %[[CGE]]
|
|
// OPTIM: ret i8 %[[CGEL]]
|
|
three_way_compare(a, b)
|
|
}
|
|
|
|
#[no_mangle]
|
|
// CHECK-LABEL: @unsigned_cmp
|
|
// DEBUG-SAME: (i16 %a, i16 %b)
|
|
// OPTIM-SAME: (i16 noundef %a, i16 noundef %b)
|
|
pub fn unsigned_cmp(a: u16, b: u16) -> std::cmp::Ordering {
|
|
// DEBUG: %[[GT:.+]] = icmp ugt i16 %a, %b
|
|
// DEBUG: %[[ZGT:.+]] = zext i1 %[[GT]] to i8
|
|
// DEBUG: %[[LT:.+]] = icmp ult i16 %a, %b
|
|
// DEBUG: %[[ZLT:.+]] = zext i1 %[[LT]] to i8
|
|
// DEBUG: %[[R:.+]] = sub nsw i8 %[[ZGT]], %[[ZLT]]
|
|
|
|
// OPTIM: %[[LT:.+]] = icmp ult i16 %a, %b
|
|
// OPTIM: %[[NE:.+]] = icmp ne i16 %a, %b
|
|
// OPTIM: %[[CGE:.+]] = select i1 %[[NE]], i8 1, i8 0
|
|
// OPTIM: %[[CGEL:.+]] = select i1 %[[LT]], i8 -1, i8 %[[CGE]]
|
|
// OPTIM: ret i8 %[[CGEL]]
|
|
three_way_compare(a, b)
|
|
}
|