2020-06-07 04:58:52 -04:00
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#![allow(clippy::cast_ptr_alignment)]
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2020-06-04 16:39:33 -04:00
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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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2020-06-11 06:42:22 -04:00
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use super::super::Buffer;
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2020-07-04 09:32:33 -04:00
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use super::sse2;
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2020-06-04 16:39:33 -04:00
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use super::{ESCAPED, ESCAPED_LEN, ESCAPE_LUT};
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const VECTOR_BYTES: usize = std::mem::size_of::<__m256i>();
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const VECTOR_ALIGN: usize = VECTOR_BYTES - 1;
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#[target_feature(enable = "avx2")]
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2020-06-18 04:23:50 -04:00
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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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2020-06-04 16:39:33 -04:00
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2020-07-04 09:32:33 -04:00
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if len < VECTOR_BYTES {
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2020-06-18 04:23:50 -04:00
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sse2::escape(feed, buffer);
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2020-06-04 16:39:33 -04:00
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return;
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}
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2020-06-18 04:23:50 -04:00
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let mut start_ptr = feed.as_ptr();
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2020-06-09 21:56:25 -04:00
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let end_ptr = start_ptr.add(len);
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2020-06-14 23:06:14 -04:00
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let v_independent1 = _mm256_set1_epi8(5);
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2020-06-04 16:39:33 -04:00
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let v_independent2 = _mm256_set1_epi8(2);
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2020-06-14 23:06:14 -04:00
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let v_key1 = _mm256_set1_epi8(0x27);
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2020-06-04 16:39:33 -04:00
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let v_key2 = _mm256_set1_epi8(0x3e);
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let maskgen = |x: __m256i| -> i32 {
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_mm256_movemask_epi8(_mm256_or_si256(
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_mm256_cmpeq_epi8(_mm256_or_si256(x, v_independent1), v_key1),
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_mm256_cmpeq_epi8(_mm256_or_si256(x, v_independent2), v_key2),
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))
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};
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let mut ptr = start_ptr;
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let aligned_ptr = ptr.add(VECTOR_BYTES - (start_ptr as usize & VECTOR_ALIGN));
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{
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let mut mask = maskgen(_mm256_loadu_si256(ptr as *const __m256i));
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loop {
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let trailing_zeros = mask.trailing_zeros() as usize;
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let ptr2 = ptr.add(trailing_zeros);
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if ptr2 >= aligned_ptr {
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break;
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}
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let c = ESCAPE_LUT[*ptr2 as usize] as usize;
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2020-06-14 23:06:14 -04:00
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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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buffer.push_str(*ESCAPED.get_unchecked(c));
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start_ptr = ptr2.add(1);
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2020-06-04 16:39:33 -04:00
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}
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mask ^= 1 << trailing_zeros;
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}
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}
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ptr = aligned_ptr;
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let mut next_ptr = ptr.add(VECTOR_BYTES);
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while next_ptr <= end_ptr {
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let mut mask = maskgen(_mm256_load_si256(ptr as *const __m256i));
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while mask != 0 {
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let trailing_zeros = mask.trailing_zeros() as usize;
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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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2020-06-14 23:06:14 -04:00
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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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buffer.push_str(*ESCAPED.get_unchecked(c));
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start_ptr = ptr2.add(1);
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2020-06-04 16:39:33 -04:00
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}
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mask ^= 1 << trailing_zeros;
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}
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ptr = next_ptr;
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next_ptr = next_ptr.add(VECTOR_BYTES);
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}
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2020-06-09 21:27:13 -04:00
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sse2::escape_aligned(buffer, start_ptr, ptr, end_ptr);
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2020-06-04 16:39:33 -04:00
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}
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