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libm fallback for Pow, factorize MulAdd

This commit is contained in:
Yoan Lecoq 2019-02-03 15:21:18 +01:00 committed by Josh Stone
parent 4d3cb0a4ba
commit 4234eb76aa
3 changed files with 25 additions and 62 deletions
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4
README.md
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@ -31,13 +31,13 @@ the default `std` feature. Use this in `Cargo.toml`:
[dependencies.num-traits]
version = "0.2"
default-features = false
# features = ["libm"] # <--- Uncomment if you wish to use `Float` and `Real`
# features = ["libm"] # <--- Uncomment if you wish to use `Float` and `Real` without `std`
```
The `Float` and `Real` traits are only available when either `std` or `libm` is enabled.
The `FloatCore` trait is always available. `MulAdd` and `MulAddAssign` for `f32`
and `f64` also require `std`, as do implementations of signed and floating-
and `f64` also require `std` or `libm`, as do implementations of signed and floating-
point exponents in `Pow`.
Implementations for `i128` and `u128` are only available with Rust 1.26 and

54
src/ops/mul_add.rs
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@ -34,47 +34,26 @@ pub trait MulAddAssign<A = Self, B = Self> {
fn mul_add_assign(&mut self, a: A, b: B);
}
#[cfg(feature = "std")]
#[cfg(any(feature = "std", feature = "libm"))]
impl MulAdd<f32, f32> for f32 {
type Output = Self;
#[inline]
fn mul_add(self, a: Self, b: Self) -> Self::Output {
f32::mul_add(self, a, b)
<Self as ::Float>::mul_add(self, a, b)
}
}
#[cfg(feature = "std")]
#[cfg(any(feature = "std", feature = "libm"))]
impl MulAdd<f64, f64> for f64 {
type Output = Self;
#[inline]
fn mul_add(self, a: Self, b: Self) -> Self::Output {
f64::mul_add(self, a, b)
<Self as ::Float>::mul_add(self, a, b)
}
}
#[cfg(all(not(feature = "std"), feature = "libm"))]
impl MulAdd<f32, f32> for f32 {
type Output = Self;
#[inline]
fn mul_add(self, a: Self, b: Self) -> Self::Output {
<f32 as ::libm::F32Ext>::mul_add(self, a, b)
}
}
#[cfg(all(not(feature = "std"), feature = "libm"))]
impl MulAdd<f64, f64> for f64 {
type Output = Self;
#[inline]
fn mul_add(self, a: Self, b: Self) -> Self::Output {
<f64 as ::libm::F64Ext>::mul_add(self, a, b)
}
}
macro_rules! mul_add_impl {
($trait_name:ident for $($t:ty)*) => {$(
impl $trait_name for $t {
@ -92,39 +71,22 @@ mul_add_impl!(MulAdd for isize usize i8 u8 i16 u16 i32 u32 i64 u64);
#[cfg(has_i128)]
mul_add_impl!(MulAdd for i128 u128);
#[cfg(feature = "std")]
#[cfg(any(feature = "std", feature = "libm"))]
impl MulAddAssign<f32, f32> for f32 {
#[inline]
fn mul_add_assign(&mut self, a: Self, b: Self) {
*self = f32::mul_add(*self, a, b)
*self = <Self as ::Float>::mul_add(*self, a, b)
}
}
#[cfg(feature = "std")]
#[cfg(any(feature = "std", feature = "libm"))]
impl MulAddAssign<f64, f64> for f64 {
#[inline]
fn mul_add_assign(&mut self, a: Self, b: Self) {
*self = f64::mul_add(*self, a, b)
*self = <Self as ::Float>::mul_add(*self, a, b)
}
}
#[cfg(all(not(feature = "std"), feature = "libm"))]
impl MulAddAssign<f32, f32> for f32 {
#[inline]
fn mul_add_assign(&mut self, a: Self, b: Self) {
*self = <f32 as ::libm::F32Ext>::mul_add(*self, a, b)
}
}
#[cfg(all(not(feature = "std"), feature = "libm"))]
impl MulAddAssign<f64, f64> for f64 {
#[inline]
fn mul_add_assign(&mut self, a: Self, b: Self) {
*self = <f64 as ::libm::F64Ext>::mul_add(*self, a, b)
}
}
macro_rules! mul_add_assign_impl {
($trait_name:ident for $($t:ty)*) => {$(
impl $trait_name for $t {

29
src/pow.rs
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@ -152,23 +152,24 @@ pow_impl!(Wrapping<isize>);
// pow_impl!(usize, u64);
// pow_impl!(isize, u64);
#[cfg(feature = "std")]
#[cfg(any(feature = "std", feature = "libm"))]
mod float_impls {
use super::Pow;
use ::Float;
pow_impl!(f32, i8, i32, f32::powi);
pow_impl!(f32, u8, i32, f32::powi);
pow_impl!(f32, i16, i32, f32::powi);
pow_impl!(f32, u16, i32, f32::powi);
pow_impl!(f32, i32, i32, f32::powi);
pow_impl!(f64, i8, i32, f64::powi);
pow_impl!(f64, u8, i32, f64::powi);
pow_impl!(f64, i16, i32, f64::powi);
pow_impl!(f64, u16, i32, f64::powi);
pow_impl!(f64, i32, i32, f64::powi);
pow_impl!(f32, f32, f32, f32::powf);
pow_impl!(f64, f32, f64, f64::powf);
pow_impl!(f64, f64, f64, f64::powf);
pow_impl!(f32, i8, i32, <f32 as Float>::powi);
pow_impl!(f32, u8, i32, <f32 as Float>::powi);
pow_impl!(f32, i16, i32, <f32 as Float>::powi);
pow_impl!(f32, u16, i32, <f32 as Float>::powi);
pow_impl!(f32, i32, i32, <f32 as Float>::powi);
pow_impl!(f64, i8, i32, <f64 as Float>::powi);
pow_impl!(f64, u8, i32, <f64 as Float>::powi);
pow_impl!(f64, i16, i32, <f64 as Float>::powi);
pow_impl!(f64, u16, i32, <f64 as Float>::powi);
pow_impl!(f64, i32, i32, <f64 as Float>::powi);
pow_impl!(f32, f32, f32, <f32 as Float>::powf);
pow_impl!(f64, f32, f64, <f64 as Float>::powf);
pow_impl!(f64, f64, f64, <f64 as Float>::powf);
}
/// Raises a value to the power of exp, using exponentiation by squaring.