/rust/registry/src/index.crates.io-1949cf8c6b5b557f/httparse-1.10.1/src/simd/runtime.rs

Source
use std::sync::atomic::{AtomicU8, Ordering};
use crate::iter::Bytes;
use super::avx2;
use super::sse42;

const AVX2: u8 = 1;
const SSE42: u8 = 2;
const NOP: u8 = 3;

fn detect_runtime_feature() -> u8 {
    if is_x86_feature_detected!("avx2") {
        AVX2
    } else if is_x86_feature_detected!("sse4.2") {
        SSE42
    } else {
        NOP
    }
}

static RUNTIME_FEATURE: AtomicU8 = AtomicU8::new(0);

#[inline]
fn get_runtime_feature() -> u8 {
    let mut feature = RUNTIME_FEATURE.load(Ordering::Relaxed);
    if feature == 0 {
        feature = detect_runtime_feature();
        RUNTIME_FEATURE.store(feature, Ordering::Relaxed);
    }

    feature
}

pub fn match_header_name_vectored(bytes: &mut Bytes) {
    super::swar::match_header_name_vectored(bytes);
}

pub fn match_uri_vectored(bytes: &mut Bytes) {
    // SAFETY: calls are guarded by a feature check
    unsafe {
        match get_runtime_feature() {
            AVX2 => avx2::match_uri_vectored(bytes),
            SSE42 => sse42::match_uri_vectored(bytes),
            _ /* NOP */ => super::swar::match_uri_vectored(bytes),
        }
    }
}

pub fn match_header_value_vectored(bytes: &mut Bytes) {
    // SAFETY: calls are guarded by a feature check
    unsafe {
        match get_runtime_feature() {
            AVX2 => avx2::match_header_value_vectored(bytes),
            SSE42 => sse42::match_header_value_vectored(bytes),
            _ /* NOP */ => super::swar::match_header_value_vectored(bytes),
        }
    }
}

Coverage Report

Created: 2025-10-28 06:54

Line	Count	Source
1		use std::sync::atomic::{AtomicU8, Ordering};
2		use crate::iter::Bytes;
3		use super::avx2;
4		use super::sse42;
5
6		const AVX2: u8 = 1;
7		const SSE42: u8 = 2;
8		const NOP: u8 = 3;
9
10	0	fn detect_runtime_feature() -> u8 {
11	0	if is_x86_feature_detected!("avx2") {
12	0	AVX2
13	0	} else if is_x86_feature_detected!("sse4.2") {
14	0	SSE42
15		} else {
16	0	NOP
17		}
18	0	}
19
20		static RUNTIME_FEATURE: AtomicU8 = AtomicU8::new(0);
21
22		#[inline]
23	0	fn get_runtime_feature() -> u8 {
24	0	let mut feature = RUNTIME_FEATURE.load(Ordering::Relaxed);
25	0	if feature == 0 {
26	0	feature = detect_runtime_feature();
27	0	RUNTIME_FEATURE.store(feature, Ordering::Relaxed);
28	0	}
29
30	0	feature
31	0	}
32
33	0	pub fn match_header_name_vectored(bytes: &mut Bytes) {
34	0	super::swar::match_header_name_vectored(bytes);
35	0	}
36
37	0	pub fn match_uri_vectored(bytes: &mut Bytes) {
38		// SAFETY: calls are guarded by a feature check
39		unsafe {
40	0	match get_runtime_feature() {
41	0	AVX2 => avx2::match_uri_vectored(bytes),
42	0	SSE42 => sse42::match_uri_vectored(bytes),
43	0	_ /* NOP */ => super::swar::match_uri_vectored(bytes),
44		}
45		}
46	0	}
47
48	0	pub fn match_header_value_vectored(bytes: &mut Bytes) {
49		// SAFETY: calls are guarded by a feature check
50		unsafe {
51	0	match get_runtime_feature() {
52	0	AVX2 => avx2::match_header_value_vectored(bytes),
53	0	SSE42 => sse42::match_header_value_vectored(bytes),
54	0	_ /* NOP */ => super::swar::match_header_value_vectored(bytes),
55		}
56		}
57	0	}