编写更紧凑的simd代码的助手

已实现

• cold_for_target_arch 仅对某些架构标记函数为冷
• cold_for_target_feature

示例

[dependencies]
simd_helpers = "0.1"

use simd_helpers::cold_for_target_arch;

// On arm and power it is the main, impl for x86_64 there is a asm-optimized variant
#[cold_for_target_arch("x86_64")]
fn fallback_simple_impl() { ... }