compiler-builtins-zynq/src/int/sdiv.rs

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use int::Int;
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macro_rules! div {
($intrinsic:ident: $ty:ty, $uty:ty) => {
/// Returns `a / b`
#[cfg_attr(not(test), no_mangle)]
pub extern "C" fn $intrinsic(a: $ty, b: $ty) -> $ty {
let s_a = a >> (<$ty>::bits() - 1);
let s_b = b >> (<$ty>::bits() - 1);
let a = (a ^ s_a) - s_a;
let b = (b ^ s_b) - s_b;
let s = s_a ^ s_b;
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let r = udiv!(a as $uty, b as $uty);
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(r as $ty ^ s) - s
}
}
}
macro_rules! mod_ {
($intrinsic:ident: $ty:ty, $uty:ty) => {
/// Returns `a % b`
#[cfg_attr(not(test), no_mangle)]
pub extern "C" fn $intrinsic(a: $ty, b: $ty) -> $ty {
let s = b >> (<$ty>::bits() - 1);
let b = (b ^ s) - s;
let s = a >> (<$ty>::bits() - 1);
let a = (a ^ s) - s;
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let r = urem!(a as $uty, b as $uty);
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(r as $ty ^ s) - s
}
}
}
macro_rules! divmod {
($intrinsic:ident, $div:ident: $ty:ty) => {
/// Returns `a / b` and sets `*rem = n % d`
#[cfg_attr(not(test), no_mangle)]
pub extern "C" fn $intrinsic(a: $ty, b: $ty, rem: &mut $ty) -> $ty {
#[cfg(all(feature = "c", any(target_arch = "x86")))]
extern {
fn $div(a: $ty, b: $ty) -> $ty;
}
let r = unsafe { $div(a, b) };
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*rem = a - (r * b);
r
}
}
}
#[cfg(not(all(feature = "c", target_arch = "arm", not(target_os = "ios"), not(thumbv6m))))]
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div!(__divsi3: i32, u32);
#[cfg(not(all(feature = "c", target_arch = "x86")))]
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div!(__divdi3: i64, u64);
#[cfg(not(all(feature = "c", target_arch = "arm", not(target_os = "ios"))))]
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mod_!(__modsi3: i32, u32);
#[cfg(not(all(feature = "c", target_arch = "x86")))]
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mod_!(__moddi3: i64, u64);
#[cfg(not(all(feature = "c", target_arch = "arm", not(target_os = "ios"))))]
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divmod!(__divmodsi4, __divsi3: i32);
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divmod!(__divmoddi4, __divdi3: i64);
#[cfg(test)]
mod tests {
use qc::{U32, U64};
check! {
fn __divdi3(f: extern fn(i64, i64) -> i64, n: U64, d: U64) -> Option<i64> {
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let (n, d) = (n.0 as i64, d.0 as i64);
if d == 0 {
None
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} else {
Some(f(n, d))
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}
}
fn __moddi3(f: extern fn(i64, i64) -> i64, n: U64, d: U64) -> Option<i64> {
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let (n, d) = (n.0 as i64, d.0 as i64);
if d == 0 {
None
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} else {
Some(f(n, d))
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}
}
fn __divmoddi4(f: extern fn(i64, i64, &mut i64) -> i64,
n: U64,
d: U64) -> Option<(i64, i64)> {
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let (n, d) = (n.0 as i64, d.0 as i64);
if d == 0 {
None
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} else {
let mut r = 0;
let q = f(n, d, &mut r);
Some((q, r))
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}
}
fn __divsi3(f: extern fn(i32, i32) -> i32,
n: U32,
d: U32) -> Option<i32> {
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let (n, d) = (n.0 as i32, d.0 as i32);
if d == 0 {
None
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} else {
Some(f(n, d))
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}
}
fn __modsi3(f: extern fn(i32, i32) -> i32,
n: U32,
d: U32) -> Option<i32> {
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let (n, d) = (n.0 as i32, d.0 as i32);
if d == 0 {
None
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} else {
Some(f(n, d))
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}
}
fn __divmodsi4(f: extern fn(i32, i32, &mut i32) -> i32,
n: U32,
d: U32) -> Option<(i32, i32)> {
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let (n, d) = (n.0 as i32, d.0 as i32);
if d == 0 {
None
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} else {
let mut r = 0;
let q = f(n, d, &mut r);
Some((q, r))
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}
}
}
}