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Move clzi2 into the int module

This commit is contained in:
Lokathor 2018-12-21 18:02:12 -07:00
parent a74490a75b
commit 4e3fc640df
2 changed files with 62 additions and 62 deletions
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62
src/arm.rs
View File

@ -233,65 +233,3 @@ pub unsafe extern "aapcs" fn __aeabi_memclr4(dest: *mut u8, n: usize) {
pub unsafe extern "aapcs" fn __aeabi_memclr8(dest: *mut u8, n: usize) {
__aeabi_memset4(dest, n, 0);
}
#[no_mangle]
#[cfg(any(
target_pointer_width = "16",
target_pointer_width = "32",
target_pointer_width = "64"
))]
pub extern "C" fn __clzsi2(mut x: usize) -> usize {
// TODO: const this? Requires const if
let mut y: usize;
let mut n: usize = {
#[cfg(target_pointer_width = "64")]
{
64
}
#[cfg(target_pointer_width = "32")]
{
32
}
#[cfg(target_pointer_width = "16")]
{
16
}
};
#[cfg(target_pointer_width = "64")]
{
y = x >> 32;
if y != 0 {
n -= 32;
x = y;
}
}
#[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
{
y = x >> 16;
if y != 0 {
n -= 16;
x = y;
}
}
y = x >> 8;
if y != 0 {
n -= 8;
x = y;
}
y = x >> 4;
if y != 0 {
n -= 4;
x = y;
}
y = x >> 2;
if y != 0 {
n -= 2;
x = y;
}
y = x >> 1;
if y != 0 {
n - 2
} else {
n - x
}
}

62
src/int/mod.rs
View File

@ -300,3 +300,65 @@ macro_rules! impl_wide_int {
impl_wide_int!(u32, u64, 32);
impl_wide_int!(u64, u128, 64);
#[no_mangle]
#[cfg(any(
target_pointer_width = "16",
target_pointer_width = "32",
target_pointer_width = "64"
))]
pub extern "C" fn __clzsi2(mut x: usize) -> usize {
// TODO: const this? Would require const-if
let mut y: usize;
let mut n: usize = {
#[cfg(target_pointer_width = "64")]
{
64
}
#[cfg(target_pointer_width = "32")]
{
32
}
#[cfg(target_pointer_width = "16")]
{
16
}
};
#[cfg(target_pointer_width = "64")]
{
y = x >> 32;
if y != 0 {
n -= 32;
x = y;
}
}
#[cfg(any(target_pointer_width = "32", target_pointer_width = "64"))]
{
y = x >> 16;
if y != 0 {
n -= 16;
x = y;
}
}
y = x >> 8;
if y != 0 {
n -= 8;
x = y;
}
y = x >> 4;
if y != 0 {
n -= 4;
x = y;
}
y = x >> 2;
if y != 0 {
n -= 2;
x = y;
}
y = x >> 1;
if y != 0 {
n - 2
} else {
n - x
}
}