54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
#include "sn_intrinsic.h"
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int index_pair_sse(short const *str, uint32_t target, int length)
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{
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int index = 0, result = 0, size = length, end = size - 8;
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__m128i s = {
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target,
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target,
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target,
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target,
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};
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__m128i vec, com;
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while (index < end) {
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vec = _mm_loadu_epi32(str + index);
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com = _mm_cmpeq_epi16(vec, s);
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result = _mm_movemask_epi8(com);
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if (result) {
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for (size_t i = 0; i < 7; i++) {
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if (((result & 0xF) == 0xF)) {
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return index + i;
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}
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if (result == 0) {
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break;
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}
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result >>= 2;
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}
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}
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index += 1;
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vec = _mm_loadu_epi32(str + index);
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com = _mm_cmpeq_epi16(vec, s);
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result = _mm_movemask_epi8(com);
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if (result) {
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for (size_t i = 0; i < 7; i++) {
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if (((result & 0xF) == 0xF)) {
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return index + i;
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}
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if (result == 0) {
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break;
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}
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result >>= 2;
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}
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}
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index += 7;
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}
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for (; (index < size - 1) && (!result); index += 2) {
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result = *(int *)(str + index) == target;
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}
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if (result) {
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return index;
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}
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return -1;
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}
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