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/// halves-optimized, 32-bit using bswap unsigned rbH4 (unsigned arg) { __asm { mov eax, arg lea edx, [eax+eax] shr eax, 1 and eax, 55555555H and edx, 0AAAAAAAAH or eax, edx lea edx, [eax+eax] shr eax, 2 add edx, edx and eax, 33333333H and edx, 0CCCCCCCCH or eax, edx mov edx, eax shr eax, 4 shl edx, 4 and eax, 0F0F0F0FH and edx, 0F0F0F0F0H or eax, edx bswap eax // reverse bytes } // return eax }
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