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Code Issues Releases Activity

Add `no_neon` feature to disable NEON on aarch64

This commit is contained in:
rsdy 2021-10-08 11:34:35 +01:00
parent 0a0bb7126e
commit 20fd56ac0f
2 changed files with 10 additions and 1 deletions
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1
Cargo.toml
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@ -73,6 +73,7 @@ no_sse2 = []
no_sse41 = []
no_avx2 = []
no_avx512 = []
no_neon = []
[package.metadata.docs.rs]
# Document Hasher::update_rayon on docs.rs.

10
build.rs
View File

@ -17,6 +17,10 @@ fn is_neon() -> bool {
defined("CARGO_FEATURE_NEON")
}
fn is_no_neon() -> bool {
defined("CARGO_FEATURE_NO_NEON")
}
fn is_ci() -> bool {
defined("BLAKE3_CI")
}
@ -226,6 +230,10 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
panic!("It doesn't make sense to enable both \"pure\" and \"neon\".");
}
if is_no_neon() && is_neon() {
panic!("It doesn't make sense to enable both \"no_neon\" and \"neon\".");
}
if is_x86_64() || is_x86_32() {
let support = c_compiler_support();
if is_x86_32() || should_prefer_intrinsics() || is_pure() || support == NoCompiler {
@ -245,7 +253,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
}
}
if (is_arm() && is_neon()) || (is_aarch64() && !is_pure()) {
if (is_arm() && is_neon()) || (!is_no_neon() && !is_pure() && is_aarch64()) {
println!("cargo:rustc-cfg=blake3_neon");
build_neon_c_intrinsics();
}