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use int::{Int, LargeInt};
trait Ashl: Int + LargeInt {
fn ashl(self, offset: u32) -> Self
where
Self: LargeInt<HighHalf = <Self as LargeInt>::LowHalf>,
{
let half_bits = Self::BITS / 2;
if offset & half_bits != 0 {
Self::from_parts(Int::ZERO, self.low() << (offset - half_bits))
} else if offset == 0 {
self
} else {
Self::from_parts(
self.low() << offset,
(self.high() << offset) | (self.low() >> (half_bits - offset)),
)
}
}
}
impl Ashl for u64 {}
impl Ashl for u128 {}
trait Ashr: Int + LargeInt {
fn ashr(self, offset: u32) -> Self
where
Self: LargeInt<LowHalf = <<Self as LargeInt>::HighHalf as Int>::UnsignedInt>,
{
let half_bits = Self::BITS / 2;
if offset & half_bits != 0 {
Self::from_parts(
(self.high() >> (offset - half_bits)).unsigned(),
self.high() >> (half_bits - 1),
)
} else if offset == 0 {
self
} else {
let high_unsigned = self.high().unsigned();
Self::from_parts(
(high_unsigned << (half_bits - offset)) | (self.low() >> offset),
self.high() >> offset,
)
}
}
}
impl Ashr for i64 {}
impl Ashr for i128 {}
trait Lshr: Int + LargeInt {
fn lshr(self, offset: u32) -> Self
where
Self: LargeInt<HighHalf = <Self as LargeInt>::LowHalf>,
{
let half_bits = Self::BITS / 2;
if offset & half_bits != 0 {
Self::from_parts(self.high() >> (offset - half_bits), Int::ZERO)
} else if offset == 0 {
self
} else {
Self::from_parts(
(self.high() << (half_bits - offset)) | (self.low() >> offset),
self.high() >> offset,
)
}
}
}
impl Lshr for u64 {}
impl Lshr for u128 {}
intrinsics! {
#[maybe_use_optimized_c_shim]
#[arm_aeabi_alias = __aeabi_llsl]
pub extern "C" fn __ashldi3(a: u64, b: u32) -> u64 {
a.ashl(b)
}
pub extern "C" fn __ashlti3(a: u128, b: u32) -> u128 {
a.ashl(b)
}
#[maybe_use_optimized_c_shim]
#[arm_aeabi_alias = __aeabi_lasr]
pub extern "C" fn __ashrdi3(a: i64, b: u32) -> i64 {
a.ashr(b)
}
pub extern "C" fn __ashrti3(a: i128, b: u32) -> i128 {
a.ashr(b)
}
#[maybe_use_optimized_c_shim]
#[arm_aeabi_alias = __aeabi_llsr]
pub extern "C" fn __lshrdi3(a: u64, b: u32) -> u64 {
a.lshr(b)
}
pub extern "C" fn __lshrti3(a: u128, b: u32) -> u128 {
a.lshr(b)
}
pub extern "C" fn __rust_i128_shlo(a: i128, b: u128) -> (i128, bool) {
(__ashlti3(a as _, b as _) as _, b >= 128)
}
pub extern "C" fn __rust_u128_shlo(a: u128, b: u128) -> (u128, bool) {
(__ashlti3(a, b as _), b >= 128)
}
pub extern "C" fn __rust_i128_shro(a: i128, b: u128) -> (i128, bool) {
(__ashrti3(a, b as _), b >= 128)
}
pub extern "C" fn __rust_u128_shro(a: u128, b: u128) -> (u128, bool) {
(__lshrti3(a, b as _), b >= 128)
}
}