Rip out core::arch wrappers (#216)

Remove the wrappers for intrinsics inherited from `pulp` now that #214
provides a way to access intrinsics without us having to wrap every
single one.

Part of #166

Supersedes #209

Author: Shnatsel

fearless_simd/Cargo.toml

@@ -33,10 +33,6 @@ std = []
 # Use floating point implementations from libm
 libm = ["dep:libm"]
 
-# Include safe wrappers for (some) target feature specific intrinsics,
-# beyond the basic SIMD operations abstracted on all platforms
-safe_wrappers = []
-
 # Force the "fallback" SIMD level to be supported
 # This is primarily used for tests
 force_support_fallback = []

fearless_simd/README.md

@@ -155,8 +155,6 @@ The following crate [feature flags](https://doc.rust-lang.org/cargo/reference/fe
 - `std` (enabled by default): Get floating point functions from the standard library (likely using your target's libc).
   Also allows using [`Level::new`] on all platforms, to detect which target features are enabled.
 - `libm`: Use floating point implementations from [libm].
-- `safe_wrappers`: Include safe wrappers for (some) target feature specific intrinsics,
-  beyond the basic SIMD operations abstracted on all platforms.
 - `force_support_fallback`: Force scalar fallback, to be supported, even if your compilation target has a better baseline.
 
 At least one of `std` and `libm` is required; `std` overrides `libm`.