const_soft_float 0.1.4

Const Soft Float Point
Documentation 
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# Rust float-point in constant context

Floating-point code is from `compiler_builtins = "0.1.94"` and `libm = "0.2.6"`, and has been rewritten for use in a constant context. 

Fuzzing of all operations is performed against the relevant reference code to ensure correctness of the port, but please open an issue if there is any inconsistent behavior.

Exported Soft Float Types:
* `SoftF32` 
* `SoftF64`

Features:
* `no_std` - Enabled by default
* `const_trait_impl` - For const operator implementations
* `const_mut_refs` - For const operator with assignment implementations

On `stable`:
```
const fn const_f32_add(a: f32, b: f32) -> f32 {
    SoftF32(a).add(SoftF32(b)).to_f32()
}
```

On `nightly` with `const_trait_impl` usage:
```
const fn const_f32_add(a: f32, b: f32) -> f32 {
    (SoftF32(a) + SoftF32(b)).to_f32()
}
```

On `nightly` with `const_mut_refs` usage:
```
const fn const_f32_add(a: f32, b: f32) -> f32 {
    let mut x = SoftF32(a);
    x += SoftF32(b);
    x.to_f32()
}
```
<br>

Implemented `const` Functions:
- `from_(f32/f64)`
- `to_(f32/f64)`
- `from_bits`
- `to_bits`
- `add`
- `sub`
- `mul`
- `div`
- `cmp`
- `neg`
- `sqrt`
- `powi`
- `copysign`
- `trunc`
- `round`
- `floor`
- `sin`
- `cos`