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MSVC compat.

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This commit is contained in:
Alcaro 2014-02-22 17:11:04 +01:00
parent 527b830765
commit 8845d890d5
1 changed files with 22 additions and 2 deletions
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24
rewind.c
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@ -231,6 +231,27 @@ void state_manager_push_where(state_manager_t *state, void **data)
}
#if __SSE2__
#if defined(__GNUC__)
static inline unsigned compat_ctz(uint32_t v)
{
return __builtin_ctz(v);
}
#else
// Only checks at nibble granularity, because that's what we need.
static inline unsigned compat_ctz(uint32_t v)
{
if (v & 0x000f)
return 0;
if (v & 0x00f0)
return 4;
if (v & 0x0f00)
return 8;
if (v & 0xf000)
return 12;
return 16;
}
#endif
#include <emmintrin.h>
// There's no equivalent in libc, you'd think so ... std::mismatch exists, but it's not optimized at all. :(
static inline size_t find_change(const uint16_t * a, const uint16_t * b)
@ -246,7 +267,7 @@ static inline size_t find_change(const uint16_t * a, const uint16_t * b)
uint32_t mask = _mm_movemask_epi8(c);
if (mask != 0xffff) // Something has changed, figure out where.
{
size_t ret=(((char*)a128-(char*)a) | (__builtin_ctz(~mask))) >> 1;
size_t ret=(((char*)a128-(char*)a) | (compat_ctz(~mask))) >> 1;
return (ret | (a[ret]==b[ret]));
}
a128++;
@ -288,7 +309,6 @@ static inline size_t find_change(const uint16_t * a, const uint16_t * b)
#endif
#if __SSE2__x // this is not a typo - do not fix unless you can show evidence that this version is faster
#include <emmintrin.h>
//This one can give different answers than the C version in some cases. However, the compression ratio remains unaffected.
//It also appears to be slower. Probably due to the low average duration of this loop.
static inline size_t find_same(const uint16_t * a, const uint16_t * b)