89 lines
3.0 KiB
Rust
89 lines
3.0 KiB
Rust
#![allow(clippy::cast_ptr_alignment)]
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#[cfg(target_arch = "x86")]
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use std::arch::x86::*;
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#[cfg(target_arch = "x86_64")]
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use std::arch::x86_64::*;
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use std::slice;
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use super::naive::push_escaped_str;
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use super::{ESCAPED, ESCAPED_LEN, ESCAPE_LUT};
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use crate::Buffer;
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const VECTOR_BYTES: usize = std::mem::size_of::<__m128i>();
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#[target_feature(enable = "sse2")]
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pub unsafe fn escape(feed: &str, buffer: &mut Buffer) {
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let len = feed.len();
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let mut start_ptr = feed.as_ptr();
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let mut ptr = start_ptr;
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let end_ptr = feed[len..].as_ptr();
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let v_independent1 = _mm_set1_epi8(5);
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let v_independent2 = _mm_set1_epi8(2);
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let v_key1 = _mm_set1_epi8(0x27);
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let v_key2 = _mm_set1_epi8(0x3e);
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let maskgen = |x: __m128i| -> u32 {
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_mm_movemask_epi8(_mm_or_si128(
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_mm_cmpeq_epi8(_mm_or_si128(x, v_independent1), v_key1),
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_mm_cmpeq_epi8(_mm_or_si128(x, v_independent2), v_key2),
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)) as u32
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};
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while ptr <= end_ptr.sub(VECTOR_BYTES) {
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let mut mask = maskgen(_mm_loadu_si128(ptr as *const __m128i));
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while mask != 0 {
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let trailing_zeros = mask.trailing_zeros() as usize;
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mask ^= 1 << trailing_zeros;
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let ptr2 = ptr.add(trailing_zeros);
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let c = ESCAPE_LUT[*ptr2 as usize] as usize;
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if c < ESCAPED_LEN {
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if start_ptr < ptr2 {
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let slc = slice::from_raw_parts(
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start_ptr,
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ptr2 as usize - start_ptr as usize,
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);
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buffer.push_str(std::str::from_utf8_unchecked(slc));
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}
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push_escaped_str(*ESCAPED.get_unchecked(c), buffer);
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start_ptr = ptr2.add(1);
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}
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}
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ptr = ptr.add(VECTOR_BYTES);
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}
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debug_assert!(ptr.add(VECTOR_BYTES) > end_ptr);
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if ptr < end_ptr {
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debug_assert!((end_ptr as usize - ptr as usize) < VECTOR_BYTES);
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let backs = VECTOR_BYTES - (end_ptr as usize - ptr as usize);
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let read_ptr = ptr.sub(backs);
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let mut mask = maskgen(_mm_loadu_si128(read_ptr as *const __m128i)) >> backs;
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while mask != 0 {
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let trailing_zeros = mask.trailing_zeros() as usize;
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mask ^= 1 << trailing_zeros;
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let ptr2 = ptr.add(trailing_zeros);
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let c = ESCAPE_LUT[*ptr2 as usize] as usize;
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if c < ESCAPED_LEN {
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if start_ptr < ptr2 {
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let slc = slice::from_raw_parts(
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start_ptr,
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ptr2 as usize - start_ptr as usize,
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);
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buffer.push_str(std::str::from_utf8_unchecked(slc));
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}
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push_escaped_str(*ESCAPED.get_unchecked(c), buffer);
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start_ptr = ptr2.add(1);
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}
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}
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}
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if end_ptr > start_ptr {
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let slc = slice::from_raw_parts(start_ptr, end_ptr as usize - start_ptr as usize);
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buffer.push_str(std::str::from_utf8_unchecked(slc));
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}
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}
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