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Implement NEON-accelerated version of BLOCKCONV for lowercasing and uppercasing strings #11161

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Merged
merged 1 commit into from
May 4, 2023
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Implement NEON-accelerated version of BLOCKCONV for lowercasing and uppercasing strings #11161

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28 changes: 27 additions & 1 deletion Zend/zend_operators.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,9 @@
#ifdef __SSE2__
#include <emmintrin.h>
#endif
#if defined(__aarch64__) || defined(_M_ARM64)
#include <arm_neon.h>
#endif

#if defined(ZEND_WIN32) && !defined(ZTS) && defined(_MSC_VER)
/* This performance improvement of tolower() on Windows gives 10-18% on bench.php */
Expand Down Expand Up @@ -105,7 +108,30 @@ static _locale_t current_locale = NULL;
__m128i blconv_result = _mm_add_epi8(blconv_operand, blconv_add); \
_mm_storeu_si128((__m128i *)(dest), blconv_result);

#endif /* __SSE2__ */
#elif defined(__aarch64__) || defined(_M_ARM64)
#define HAVE_BLOCKCONV

#define BLOCKCONV_INIT_RANGE(start, end) \
const int8x16_t blconv_offset = vdupq_n_s8((signed char)(SCHAR_MIN - start)); \
const int8x16_t blconv_threshold = vdupq_n_s8(SCHAR_MIN + (end - start) + 1);

#define BLOCKCONV_STRIDE sizeof(int8x16_t)

#define BLOCKCONV_INIT_DELTA(delta) \
const int8x16_t blconv_delta = vdupq_n_s8(delta);

#define BLOCKCONV_LOAD(input) \
int8x16_t blconv_operand = vld1q_s8((const int8_t*)(input)); \
uint8x16_t blconv_mask = vcltq_s8(vaddq_s8(blconv_operand, blconv_offset), blconv_threshold);

#define BLOCKCONV_FOUND() vmaxvq_u8(blconv_mask)

#define BLOCKCONV_STORE(dest) \
int8x16_t blconv_add = vandq_s8(vreinterpretq_s8_u8(blconv_mask), blconv_delta); \
int8x16_t blconv_result = vaddq_s8(blconv_operand, blconv_add); \
vst1q_s8((int8_t *)(dest), blconv_result);

#endif /* defined(__aarch64__) || defined(_M_ARM64) */

ZEND_API const unsigned char zend_tolower_map[256] = {
0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,
Expand Down