bool sse42_is_xdigit(const char* s) {
if (s == nullptr) {
return false;
}
// 3 ranges
const __m128i ranges = _mm_setr_epi8(
'0', '9', 'a', 'f', 'A', 'F', 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
);
__m128i* mem = reinterpret_cast<__m128i*>(const_cast<char*>(s));
const uint8_t mode =
_SIDD_UBYTE_OPS |
_SIDD_CMP_RANGES |
_SIDD_MASKED_NEGATIVE_POLARITY |
_SIDD_LEAST_SIGNIFICANT |
_SIDD_BIT_MASK;
for (/**/; /**/; mem++) {
const __m128i chunk = _mm_loadu_si128(mem);
if (_mm_cmpistrc(ranges, chunk, mode)) {
// there are some characters outside the given ranges in a chunk
return false;
} else if (_mm_cmpistrz(ranges, chunk, mode)) {
// there is zero byte in a chunk
if (*s == 0) {
// empty string
return false;
} else {
return true;
}
}
}
assert(false && "impossible happend");
return false;
}
void
test8bit (void)
{
i1 = _mm_cmpistrm (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistri (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistra (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistrc (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistro (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistrs (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
k1 = _mm_cmpistrz (i2, i3, k4); /* { dg-error "the third argument must be an 8-bit immediate" } */
i1 = _mm_cmpestrm (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestri (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestra (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestrc (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestro (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestrs (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
k1 = _mm_cmpestrz (i2, k2, i3, k3, k4); /* { dg-error "the fifth argument must be an 8-bit immediate" } */
b1 = _mm256_blend_ps (b2, b3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
k1 = _cvtss_sh (f1, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm256_cvtps_ph (b2, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
b1 = _mm256_dp_ps (b2, b3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
e1 = _mm256_permute2f128_pd (e2, e3, k4);/* { dg-error "the last argument must be an 8-bit immediate" } */
b1 = _mm256_permute2f128_ps (b2, b3, k4);/* { dg-error "the last argument must be an 8-bit immediate" } */
l1 = _mm256_permute2f128_si256 (l2, l3, k4);/* { dg-error "the last argument must be an 8-bit immediate" } */
b1 = _mm256_permute_ps (b2, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_aeskeygenassist_si128 (i2, k4);/* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_blend_epi16 (i2, i3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_clmulepi64_si128 (i2, i3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_cvtps_ph (a1, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
d1 = _mm_dp_pd (d2, d3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
a1 = _mm_dp_ps (a2, a3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
a1 = _mm_insert_ps (a2, a3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_mpsadbw_epu8 (i2, i3, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
a1 = _mm_permute_ps (a2, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_slli_si128 (i2, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
i1 = _mm_srli_si128 (i2, k4); /* { dg-error "the last argument must be an 8-bit immediate" } */
}
__strspn_sse42 (const char *s, const char *a)
{
if (*a == 0)
return 0;
const char *aligned;
__m128i mask;
int offset = (int) ((size_t) a & 15);
if (offset != 0)
{
/* Load masks. */
aligned = (const char *) ((size_t) a & -16L);
__m128i mask0 = _mm_load_si128 ((__m128i *) aligned);
mask = __m128i_shift_right (mask0, offset);
/* Find where the NULL terminator is. */
int length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16 - offset)
{
/* There is no NULL terminator. */
__m128i mask1 = _mm_load_si128 ((__m128i *) (aligned + 16));
int index = _mm_cmpistri (mask1, mask1, 0x3a);
length += index;
/* Don't use SSE4.2 if the length of A > 16. */
if (length > 16)
return __strspn_sse2 (s, a);
if (index != 0)
{
/* Combine mask0 and mask1. We could play games with
palignr, but frankly this data should be in L1 now
so do the merge via an unaligned load. */
mask = _mm_loadu_si128 ((__m128i *) a);
}
}
}
else
{
/* A is aligned. */
mask = _mm_load_si128 ((__m128i *) a);
/* Find where the NULL terminator is. */
int length = _mm_cmpistri (mask, mask, 0x3a);
if (length == 16)
{
/* There is no NULL terminator. Don't use SSE4.2 if the length
of A > 16. */
if (a[16] != 0)
return __strspn_sse2 (s, a);
}
}
offset = (int) ((size_t) s & 15);
if (offset != 0)
{
/* Check partial string. */
aligned = (const char *) ((size_t) s & -16L);
__m128i value = _mm_load_si128 ((__m128i *) aligned);
value = __m128i_shift_right (value, offset);
int length = _mm_cmpistri (mask, value, 0x12);
/* No need to check CFlag since it is always 1. */
if (length < 16 - offset)
return length;
/* Find where the NULL terminator is. */
int index = _mm_cmpistri (value, value, 0x3a);
if (index < 16 - offset)
return length;
aligned += 16;
}
else
aligned = s;
while (1)
{
__m128i value = _mm_load_si128 ((__m128i *) aligned);
int index = _mm_cmpistri (mask, value, 0x12);
int cflag = _mm_cmpistrc (mask, value, 0x12);
if (cflag)
return (size_t) (aligned + index - s);
aligned += 16;
}
}
wchar_t * __cdecl wcsstr (
const wchar_t * wcs1,
const wchar_t * wcs2
)
{
const wchar_t *stmp1, *stmp2;
__m128i zero, pattern, characters1, characters2;
// An empty search string matches everything.
if (0 == *wcs2)
return (wchar_t *)wcs1;
if (__isa_available > __ISA_AVAILABLE_SSE2)
{
wchar_t c;
unsigned i;
// Load XMM with first characters of wcs2.
if (XMM_PAGE_SAFE(wcs2))
{
pattern = _mm_loadu_si128((__m128i*)wcs2);
}
else
{
pattern = _mm_xor_si128(pattern, pattern);
c = *(stmp2 = wcs2);
for (i = 0; i < XMM_CHARS; ++i)
{
pattern = _mm_srli_si128(pattern, sizeof(wchar_t));
pattern = _mm_insert_epi16(pattern, c, (XMM_CHARS-1));
if (0 != c) c = *++stmp2;
}
}
for(;;)
{
// Check for partial match, if none step forward and continue.
if (XMM_PAGE_SAFE(wcs1))
{
characters1 = _mm_loadu_si128((__m128i*)wcs1);
// If no potential match or end found, try next XMMWORD.
if (_mm_cmpistra(pattern, characters1, f_srch_sub))
{
wcs1 += XMM_CHARS;
continue;
}
// If end found there was no match.
else if (!_mm_cmpistrc(pattern, characters1, f_srch_sub))
{
return NULL;
}
// Get position of potential match.
wcs1 += _mm_cmpistri(pattern, characters1, f_srch_sub);
}
else
{
// If end of string found there was no match.
if (0 == *wcs1)
{
return NULL;
}
// If current character doesn't match first character
// of search string try next character.
if (*wcs1 != *wcs2)
{
++wcs1;
continue;
}
}
// Potential match, compare to check for full match.
stmp1 = wcs1;
stmp2 = wcs2;
for (;;)
{
// If next XMMWORD is page-safe for each string
// do a XMMWORD comparison.
if (XMM_PAGE_SAFE(stmp1) && XMM_PAGE_SAFE(stmp2))
{
characters1 = _mm_loadu_si128((__m128i*)stmp1);
characters2 = _mm_loadu_si128((__m128i*)stmp2);
// If unequal then no match found.
if (!_mm_cmpistro(characters2, characters1, f_srch_sub))
{
break;
}
// If end of search string then match found.
else if (_mm_cmpistrs(characters2, characters1, f_srch_sub))
{
return (wchar_t *)wcs1;
}
stmp1 += XMM_CHARS;
stmp2 += XMM_CHARS;
continue;
}
// Compare next character.
else
{
// If end of search string then match found.
if (0 == *stmp2)
{
return (wchar_t *)wcs1;
}
// If unequal then no match found.
if (*stmp1 != *stmp2)
{
break;
}
// Character matched - try next character.
++stmp1;
++stmp2;
}
}
// Match not found at current position, try next.
++wcs1;
}
}
else if (__isa_available == __ISA_AVAILABLE_SSE2)
{
unsigned offset, mask;
// Build search pattern and zero pattern. Search pattern is
// XMMWORD with the initial character of the search string
// in every position. Zero pattern has a zero termination
// character in every position.
pattern = _mm_cvtsi32_si128(wcs2[0]);
pattern = _mm_shufflelo_epi16(pattern, 0);
pattern = _mm_shuffle_epi32(pattern, 0);
zero = _mm_xor_si128(zero, zero);
// Main loop for searching wcs1.
for (;;)
{
// If XMM check is safe advance wcs1 to the next
// possible match or end.
if (XMM_PAGE_SAFE(wcs1))
{
characters1 = _mm_loadu_si128((__m128i*)wcs1);
characters2 = _mm_cmpeq_epi16(characters1, zero);
characters1 = _mm_cmpeq_epi16(characters1, pattern);
characters1 = _mm_or_si128(characters1, characters2);
mask = _mm_movemask_epi8(characters1);
// If no character match or end found try next XMMWORD.
if (0 == mask)
{
wcs1 += XMM_CHARS;
continue;
}
// Advance wcs1 pointer to next possible match or end.
_BitScanForward(&offset, mask);
wcs1 += (offset/sizeof(wchar_t));
}
// If at the end of wcs1, then no match found.
if (0 == wcs1[0]) return NULL;
// If a first-character match is found compare
// strings to look for match.
if (wcs2[0] == wcs1[0])
{
stmp1 = wcs1;
stmp2 = wcs2;
for (;;)
{
// If aligned as specified advance to next
// possible difference or wcs2 end.
if (XMM_PAGE_SAFE(stmp2) && XMM_PAGE_SAFE(stmp1))
{
characters1 = _mm_loadu_si128((__m128i*)stmp1);
characters2 = _mm_loadu_si128((__m128i*)stmp2);
characters1 = _mm_cmpeq_epi16(characters1, characters2);
characters2 = _mm_cmpeq_epi16(characters2, zero);
characters1 = _mm_cmpeq_epi16(characters1, zero);
characters1 = _mm_or_si128(characters1, characters2);
mask = _mm_movemask_epi8(characters1);
// If mask is zero there is no difference and
// wcs2 does not end in this XMMWORD. Continue
// with next XMMWORD.
if (0 == mask)
{
stmp1 += XMM_CHARS;
stmp2 += XMM_CHARS;
continue;
}
// Advance string pointers to next significant
// character.
_BitScanForward(&offset, mask);
stmp1 += (offset/sizeof(wchar_t));
stmp2 += (offset/sizeof(wchar_t));
}
// If we've reached the end of wcs2 then a match
// has been found.
if (0 == stmp2[0]) return (wchar_t *)wcs1;
// If we've reached a difference then no match
// was found.
if (stmp1[0] != stmp2[0]) break;
// Otherwise advance to next character and try
// again.
++stmp1;
++stmp2;
}
}
// Current character wasn't a match, try next character.
++wcs1;
}
}
else
{
const wchar_t *cp = wcs1;
const wchar_t *s1, *s2;
while (*cp)
{
s1 = cp;
s2 = wcs2;
while ( *s1 && *s2 && !(*s1-*s2) )
s1++, s2++;
if (!*s2)
return (wchar_t *) cp;
cp++;
}
return NULL;
}
}
int test_mm_cmpistrc(__m128i A, __m128i B) {
// CHECK-LABEL: test_mm_cmpistrc
// CHECK: call i32 @llvm.x86.sse42.pcmpistric128(<16 x i8> %{{.*}}, <16 x i8> %{{.*}}, i8 7)
return _mm_cmpistrc(A, B, 7);
}
int test_mm_cmpistrc(__m128i A, __m128i B) {
// CHECK-LABEL: test_mm_cmpistrc
// CHECK: @llvm.x86.sse42.pcmpistric128
return _mm_cmpistrc(A, B, 7);
}