dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-18 23:09:52 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

endian_inl.h: add BSwap64

Browse Source 
Change-Id: I66672b770500294b8f4ee8fa4bf1dfff1119dbe6
This commit is contained in:
James Zern
2014-07-03 11:21:24 -07:00
parent 47779d46c8
commit ee70a90187
2 changed files with 18 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/utils/bit_reader_inl.h
View File

@ -72,21 +72,7 @@ static WEBP_INLINE void VP8LoadNewBytes(VP8BitReader* const br) {
br->buf_ += BITS >> 3;
#if !defined(__BIG_ENDIAN__)
#if (BITS > 32)
#if defined(HAVE_BUILTIN_BSWAP)
bits = (bit_t)__builtin_bswap64(in_bits);
#elif defined(_MSC_VER)
bits = (bit_t)_byteswap_uint64(in_bits);
#elif defined(__x86_64__)
__asm__ volatile("bswapq %0" : "=r"(bits) : "0"(in_bits));
#else // generic code for swapping 64-bit values (suggested by bdb@)
bits = (bit_t)in_bits;
bits = ((bits & 0xffffffff00000000ull) >> 32) |
((bits & 0x00000000ffffffffull) << 32);
bits = ((bits & 0xffff0000ffff0000ull) >> 16) |
((bits & 0x0000ffff0000ffffull) << 16);
bits = ((bits & 0xff00ff00ff00ff00ull) >> 8) |
((bits & 0x00ff00ff00ff00ffull) << 8);
#endif
bits = BSwap64(in_bits);
bits >>= 64 - BITS;
#elif (BITS >= 24)
bits = BSwap32(in_bits);