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PS-10123 (5.7) optimize my convert for arm64 platform #5688

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PS-10123 (5.7) optimize my convert for arm64 platform #5688

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33 changes: 33 additions & 0 deletions strings/ctype.c
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,9 @@
#include <m_ctype.h>
#include <my_xml.h>
#include <m_string.h>
#if defined(__aarch64__)
#include <arm_neon.h>
#endif


/*
Expand Down Expand Up @@ -1065,6 +1068,36 @@ my_convert(char *to, size_t to_length, const CHARSET_INFO *to_cs,
break;
*((uint32*) to)= *((const uint32*) from);
}
#elif defined(__aarch64__)
{
const uint8x16_t max_ascii = vdupq_n_u8(0x7F);
const size_t neon_vector_length = 16;
while (length >= neon_vector_length)
{
uint8x16_t vec_src = vld1q_u8((const unsigned char *)from);
// check if exists non-ascii character,
// ascii -> non zero, non-ascii -> zero
uint8x16_t result = vcleq_u8(vec_src, max_ascii);
if (vminvq_u8(result) == 0)
{
// has non-ascii character
break;
}

vst1q_u8((unsigned char *)to, vec_src);

from += neon_vector_length;
to += neon_vector_length;
length -= neon_vector_length;
}

for ( ; length >= 4; length-= 4, from+= 4, to+= 4)
{
if ((*(uint32*)from) & 0x80808080)
break;
*((uint32*) to)= *((const uint32*) from);
}
}
#endif /* __i386__ */

for (; ; *to++= *from++, length--)
Expand Down