150 lines
6.5 KiB
Rust
150 lines
6.5 KiB
Rust
#![feature(core_intrinsics)]
|
|
|
|
|
|
use std::intrinsics;
|
|
|
|
// The documentation of `unchecked_shl` states that it:
|
|
//
|
|
// Performs an unchecked left shift, resulting in undefined behavior when
|
|
// y < 0 or y >= N, where N is the width of T in bits.
|
|
//
|
|
// So we check this for a few `y`.
|
|
|
|
// unsigned types:
|
|
|
|
const SHL_U8: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_U16: u16 = unsafe { intrinsics::unchecked_shl(5_u16, 16) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_U32: u32 = unsafe { intrinsics::unchecked_shl(5_u32, 32) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_U64: u64 = unsafe { intrinsics::unchecked_shl(5_u64, 64) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_U128: u128 = unsafe { intrinsics::unchecked_shl(5_u128, 128) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// signed types:
|
|
|
|
const SHL_I8: i8 = unsafe { intrinsics::unchecked_shl(5_i8, 8) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I16: i16 = unsafe { intrinsics::unchecked_shl(5_16, 16) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I32: i32 = unsafe { intrinsics::unchecked_shl(5_i32, 32) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I64: i64 = unsafe { intrinsics::unchecked_shl(5_i64, 64) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I128: i128 = unsafe { intrinsics::unchecked_shl(5_i128, 128) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// and make sure we capture y < 0:
|
|
|
|
const SHL_I8_NEG: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I16_NEG: i16 = unsafe { intrinsics::unchecked_shl(5_16, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I32_NEG: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I64_NEG: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I128_NEG: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// and that there's no special relation to the value -1 by picking some
|
|
// negative values at random:
|
|
|
|
const SHL_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -6) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shl(5_16, -13) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -25) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -30) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHL_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -93) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// Repeat it all over for `unchecked_shr`
|
|
|
|
// unsigned types:
|
|
|
|
const SHR_U8: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_U16: u16 = unsafe { intrinsics::unchecked_shr(5_u16, 16) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_U32: u32 = unsafe { intrinsics::unchecked_shr(5_u32, 32) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_U64: u64 = unsafe { intrinsics::unchecked_shr(5_u64, 64) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_U128: u128 = unsafe { intrinsics::unchecked_shr(5_u128, 128) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// signed types:
|
|
|
|
const SHR_I8: i8 = unsafe { intrinsics::unchecked_shr(5_i8, 8) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I16: i16 = unsafe { intrinsics::unchecked_shr(5_16, 16) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I32: i32 = unsafe { intrinsics::unchecked_shr(5_i32, 32) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I64: i64 = unsafe { intrinsics::unchecked_shr(5_i64, 64) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I128: i128 = unsafe { intrinsics::unchecked_shr(5_i128, 128) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// and make sure we capture y < 0:
|
|
|
|
const SHR_I8_NEG: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I16_NEG: i16 = unsafe { intrinsics::unchecked_shr(5_16, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I32_NEG: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I64_NEG: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I128_NEG: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// and that there's no special relation to the value -1 by picking some
|
|
// negative values at random:
|
|
|
|
const SHR_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -6) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shr(5_16, -13) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -25) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -30) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const SHR_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -93) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// Other arithmetic functions:
|
|
|
|
const _: u16 = unsafe { std::intrinsics::unchecked_add(40000u16, 30000) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
const _: u32 = unsafe { std::intrinsics::unchecked_sub(14u32, 22) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
const _: u16 = unsafe { std::intrinsics::unchecked_mul(300u16, 250u16) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
const _: i32 = unsafe { std::intrinsics::unchecked_div(1, 0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const _: i32 = unsafe { std::intrinsics::unchecked_div(i32::MIN, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
const _: i32 = unsafe { std::intrinsics::unchecked_rem(1, 0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const _: i32 = unsafe { std::intrinsics::unchecked_rem(i32::MIN, -1) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
// capture fault with zero value
|
|
|
|
const _: u32 = unsafe { std::intrinsics::ctlz_nonzero(0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
const _: u32 = unsafe { std::intrinsics::cttz_nonzero(0) };
|
|
//~^ ERROR evaluation of constant value failed
|
|
|
|
fn main() {}
|