saymrwulf/betrusted-curve25519-dalek-source
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add cfg statements to only build doctest on x86 (#585)

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Victor Graf 2023-10-03 11:51:05 -07:00 committed by GitHub
parent 0cd099a9fb
commit e6675c67ce
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7
curve25519-dalek-derive/README.md
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@ -44,6 +44,7 @@ to build out more elaborate abstractions it starts to become painful to use.
}
struct AVX;
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
impl Backend for AVX {
#[target_feature(enable = "avx")]
unsafe fn sum(xs: &[u32]) -> u32 {
@ -53,6 +54,7 @@ to build out more elaborate abstractions it starts to become painful to use.
}
struct AVX2;
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
impl Backend for AVX2 {
#[target_feature(enable = "avx2")]
unsafe fn sum(xs: &[u32]) -> u32 {
@ -87,6 +89,7 @@ fn func() {}
```rust
// It works, but must be `unsafe`
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
#[target_feature(enable = "avx2")]
unsafe fn func() {}
```
@ -95,6 +98,7 @@ unsafe fn func() {}
use curve25519_dalek_derive::unsafe_target_feature;
// No `unsafe` on the function itself!
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
#[unsafe_target_feature("avx2")]
fn func() {}
```
@ -119,6 +123,7 @@ use curve25519_dalek_derive::unsafe_target_feature;
struct S;
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
#[unsafe_target_feature("avx2")]
impl core::ops::Add for S {
type Output = S;
@ -135,6 +140,7 @@ impl core::ops::Add for S {
```rust
use curve25519_dalek_derive::unsafe_target_feature_specialize;
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
#[unsafe_target_feature_specialize("sse2", "avx2", conditional("avx512ifma", nightly))]
mod simd {
#[for_target_feature("sse2")]
@ -149,6 +155,7 @@ mod simd {
pub fn func() { /* ... */ }
}
# #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
fn entry_point() {
#[cfg(nightly)]
if std::is_x86_feature_detected!("avx512ifma") {