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Comment the i32::MIN case for FloatCore::powi

This commit is contained in:
Josh Stone 2018-02-28 11:33:34 -08:00
parent aa9ceba628
commit 080f6f259e
1 changed files with 4 additions and 2 deletions
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6
src/float.rs
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@ -5,7 +5,7 @@ use core::num::FpCategory;
use core::f32; use core::f32;
use core::f64; use core::f64;
use {Num, NumCast}; use {Num, NumCast, ToPrimitive};
/// Generic trait for floating point numbers that works with `no_std`. /// Generic trait for floating point numbers that works with `no_std`.
/// ///
@ -668,7 +668,9 @@ pub trait FloatCore: Num + NumCast + Neg<Output = Self> + PartialOrd + Copy {
self = self.recip(); self = self.recip();
} }
// It should always be possible to convert a positive `i32` to a `usize`. // It should always be possible to convert a positive `i32` to a `usize`.
super::pow(self, exp as u32 as usize) // Note, `i32::MIN` will wrap and still be negative, so we need to convert
// to `u32` without sign-extension before growing to `usize`.
super::pow(self, (exp as u32).to_usize().unwrap())
} }
/// Converts to degrees, assuming the number is in radians. /// Converts to degrees, assuming the number is in radians.