mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-27 09:14:20 +00:00
110 lines
2.9 KiB
Rust
110 lines
2.9 KiB
Rust
// compile-flags: -O -Z merge-functions=disabled
|
|
// min-llvm-version: 15.0 # this test uses `ptr`s
|
|
// ignore-debug
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
// This tests that LLVM can optimize based on the niches in the source or
|
|
// destination types for transmutes.
|
|
|
|
#[repr(u32)]
|
|
pub enum AlwaysZero32 { X = 0 }
|
|
|
|
// CHECK-LABEL: i32 @issue_109958(i32
|
|
#[no_mangle]
|
|
pub fn issue_109958(x: AlwaysZero32) -> i32 {
|
|
// CHECK: ret i32 0
|
|
unsafe { std::mem::transmute(x) }
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @reference_is_null(ptr
|
|
#[no_mangle]
|
|
pub fn reference_is_null(x: &i32) -> bool {
|
|
// CHECK: ret i1 false
|
|
let p: *const i32 = unsafe { std::mem::transmute(x) };
|
|
p.is_null()
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @non_null_is_null(ptr
|
|
#[no_mangle]
|
|
pub fn non_null_is_null(x: std::ptr::NonNull<i32>) -> bool {
|
|
// CHECK: ret i1 false
|
|
let p: *const i32 = unsafe { std::mem::transmute(x) };
|
|
p.is_null()
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @non_zero_is_null(
|
|
#[no_mangle]
|
|
pub fn non_zero_is_null(x: std::num::NonZeroUsize) -> bool {
|
|
// CHECK: ret i1 false
|
|
let p: *const i32 = unsafe { std::mem::transmute(x) };
|
|
p.is_null()
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @non_null_is_zero(ptr
|
|
#[no_mangle]
|
|
pub fn non_null_is_zero(x: std::ptr::NonNull<i32>) -> bool {
|
|
// CHECK: ret i1 false
|
|
let a: isize = unsafe { std::mem::transmute(x) };
|
|
a == 0
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @bool_ordering_is_ge(i1
|
|
#[no_mangle]
|
|
pub fn bool_ordering_is_ge(x: bool) -> bool {
|
|
// CHECK: ret i1 true
|
|
let y: std::cmp::Ordering = unsafe { std::mem::transmute(x) };
|
|
y.is_ge()
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @ordering_is_ge_then_transmute_to_bool(i8
|
|
#[no_mangle]
|
|
pub fn ordering_is_ge_then_transmute_to_bool(x: std::cmp::Ordering) -> bool {
|
|
let r = x.is_ge();
|
|
let _: bool = unsafe { std::mem::transmute(x) };
|
|
r
|
|
}
|
|
|
|
// CHECK-LABEL: i32 @normal_div(i32
|
|
#[no_mangle]
|
|
pub fn normal_div(a: u32, b: u32) -> u32 {
|
|
// CHECK: call core::panicking::panic
|
|
a / b
|
|
}
|
|
|
|
// CHECK-LABEL: i32 @div_transmute_nonzero(i32
|
|
#[no_mangle]
|
|
pub fn div_transmute_nonzero(a: u32, b: std::num::NonZeroI32) -> u32 {
|
|
// CHECK-NOT: call core::panicking::panic
|
|
// CHECK: %[[R:.+]] = udiv i32 %a, %b
|
|
// CHECK-NEXT: ret i32 %[[R]]
|
|
// CHECK-NOT: call core::panicking::panic
|
|
let d: u32 = unsafe { std::mem::transmute(b) };
|
|
a / d
|
|
}
|
|
|
|
#[repr(i8)]
|
|
pub enum OneTwoThree { One = 1, Two = 2, Three = 3 }
|
|
|
|
// CHECK-LABEL: i8 @ordering_transmute_onetwothree(i8
|
|
#[no_mangle]
|
|
pub unsafe fn ordering_transmute_onetwothree(x: std::cmp::Ordering) -> OneTwoThree {
|
|
// CHECK: ret i8 1
|
|
std::mem::transmute(x)
|
|
}
|
|
|
|
// CHECK-LABEL: i8 @onetwothree_transmute_ordering(i8
|
|
#[no_mangle]
|
|
pub unsafe fn onetwothree_transmute_ordering(x: OneTwoThree) -> std::cmp::Ordering {
|
|
// CHECK: ret i8 1
|
|
std::mem::transmute(x)
|
|
}
|
|
|
|
// CHECK-LABEL: i1 @char_is_negative(i32
|
|
#[no_mangle]
|
|
pub fn char_is_negative(c: char) -> bool {
|
|
// CHECK: ret i1 false
|
|
let x: i32 = unsafe { std::mem::transmute(c) };
|
|
x < 0
|
|
}
|