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Use a fast SIMD implementation to XOR data going into the disk cache

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Kovid Goyal
2024-02-13 13:18:34 +05:30
parent 88f3c8c5ee
commit ad3ab877f8
5 changed files with 72 additions and 26 deletions
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8
kitty/simd-string.c
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@@ -10,6 +10,12 @@
#include "simd-string.h"
static bool has_sse4_2 = false, has_avx2 = false;
// xor_data64 {{{
static void xor_data64_scalar(const uint8_t key[64], uint8_t* data, const size_t data_sz) { for (size_t i = 0; i < data_sz; i++) data[i] ^= key[i & 63]; }
static void (*xor_data64_impl)(const uint8_t key[64], uint8_t* data, const size_t data_sz) = xor_data64_scalar;
void xor_data64(const uint8_t key[64], uint8_t* data, const size_t data_sz) { xor_data64_impl(key, data, data_sz); }
// }}}
// find_either_of_two_bytes {{{
static const uint8_t*
find_either_of_two_bytes_scalar(const uint8_t *haystack, const size_t sz, const uint8_t x, const uint8_t y) {
@@ -188,6 +194,7 @@ init_simd(void *x) {
A(has_avx2, True);
find_either_of_two_bytes_impl = find_either_of_two_bytes_256;
utf8_decode_to_esc_impl = utf8_decode_to_esc_256;
xor_data64_impl = xor_data64_256;
} else {
A(has_avx2, False);
}
@@ -195,6 +202,7 @@ init_simd(void *x) {
A(has_sse4_2, True);
if (find_either_of_two_bytes_impl == find_either_of_two_bytes_scalar) find_either_of_two_bytes_impl = find_either_of_two_bytes_128;
if (utf8_decode_to_esc_impl == utf8_decode_to_esc_scalar) utf8_decode_to_esc_impl = utf8_decode_to_esc_128;
if (xor_data64_impl == xor_data64_scalar) xor_data64_impl = xor_data64_128;
} else {
A(has_sse4_2, False);
}