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perf: reduce alignment overhead for small inputs #16

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Merged
merged 1 commit into from
Sep 23, 2025
Merged

perf: reduce alignment overhead for small inputs #16

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13 changes: 10 additions & 3 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -127,12 +127,19 @@ pub fn escape<S: AsRef<str>>(input: S) -> String {
result.push(b'"');
let s = input.as_ref();
let bytes = s.as_bytes();
let len = bytes.len();
// Runtime CPU feature detection for x86_64
if is_x86_feature_detected!("avx512f") && is_x86_feature_detected!("avx512bw") {
if is_x86_feature_detected!("avx512f")
&& is_x86_feature_detected!("avx512bw")
&& len >= x86::LOOP_SIZE_AVX512
{
unsafe { x86::escape_avx512(bytes, &mut result) }
} else if is_x86_feature_detected!("avx2") {
} else if is_x86_feature_detected!("avx2") && len >= x86::LOOP_SIZE_AVX2 {
unsafe { x86::escape_avx2(bytes, &mut result) }
} else if is_x86_feature_detected!("sse2") {
} else if is_x86_feature_detected!("sse2")
&& /* if len < 128, no need to use simd */
len >= x86::LOOP_SIZE_AVX2
{
unsafe { x86::escape_sse2(bytes, &mut result) }
} else {
escape_inner(bytes, &mut result);
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