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cold_for_target_arch
mark a function cold for certain arches only -
cold_for_target_feature
[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() { ... }