Move FastFloat to separate crate (archival)

utils/fast-float/src/lib.rs

@@ -0,0 +1,123 @@
+#![no_std]
+#![feature(core_intrinsics)]
+
+use float::Float;
+
+#[repr(transparent)]
+#[derive(Copy, Clone, Debug, PartialEq, Default)]
+pub struct FastFloat(Float);
+
+use core::intrinsics::{fadd_fast, fdiv_fast, fmul_fast, fsub_fast};
+
+impl core::ops::Mul for FastFloat {
+    type Output = Self;
+    #[inline(always)]
+    fn mul(self, o: Self) -> Self::Output {
+        unsafe { Self(fmul_fast(self.0, o.0)) }
+    }
+}
+
+impl core::ops::Mul<Float> for FastFloat {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn mul(self, o: Float) -> Self::Output {
+        unsafe { Self(fmul_fast(self.0, o)) }
+    }
+}
+
+impl core::ops::Mul<FastFloat> for Float {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn mul(self, o: FastFloat) -> Self::Output {
+        unsafe { FastFloat(fmul_fast(self, o.0)) }
+    }
+}
+
+impl core::ops::Add<FastFloat> for FastFloat {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn add(self, o: FastFloat) -> Self::Output {
+        unsafe { Self(fadd_fast(self.0, o.0)) }
+    }
+}
+
+impl core::ops::Add<Float> for FastFloat {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn add(self, o: Float) -> Self::Output {
+        unsafe { Self(fadd_fast(self.0, o)) }
+    }
+}
+
+impl core::ops::Add<FastFloat> for Float {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn add(self, o: FastFloat) -> Self::Output {
+        unsafe { FastFloat(fadd_fast(self, o.0)) }
+    }
+}
+
+impl core::ops::Sub for FastFloat {
+    type Output = Self;
+    #[inline(always)]
+    fn sub(self, o: FastFloat) -> Self::Output {
+        unsafe { Self(fsub_fast(self.0, o.0)) }
+    }
+}
+
+impl core::ops::Div for FastFloat {
+    type Output = Self;
+    #[inline(always)]
+    fn div(self, o: FastFloat) -> Self::Output {
+        unsafe { Self(fdiv_fast(self.0, o.0)) }
+    }
+}
+
+impl core::ops::MulAssign<FastFloat> for FastFloat {
+    #[inline(always)]
+    fn mul_assign(&mut self, o: FastFloat) {
+        unsafe {
+            self.0 = fmul_fast(self.0, o.0);
+        }
+    }
+}
+
+impl core::ops::Mul for &FastFloat {
+    type Output = FastFloat;
+    #[inline(always)]
+    fn mul(self, o: Self) -> Self::Output {
+        unsafe { FastFloat(fmul_fast(self.0, o.0)) }
+    }
+}
+
+impl From<Float> for FastFloat {
+    #[inline(always)]
+    fn from(f: Float) -> Self {
+        Self(f)
+    }
+}
+impl From<FastFloat> for Float {
+    #[inline(always)]
+    fn from(f: FastFloat) -> Self {
+        f.0
+    }
+}
+
+mod numt {
+    use super::{FastFloat, Float};
+    use num_traits::identities::{One, Zero};
+
+    impl One for FastFloat {
+        fn one() -> Self {
+            Self(Float::one())
+        }
+    }
+    impl Zero for FastFloat {
+        fn zero() -> Self {
+            Self(Float::zero())
+        }
+        fn is_zero(&self) -> bool {
+            self.0.is_zero()
+        }
+    }
+}