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PowerPC instructions andcx and orcx complement the value of register b before performing their respective bitwise operation. If this register happens to contain a known value, we can precompute the complement, allowing us to generate simpler code. - andcx Before: BF 00 01 00 00 mov edi,100h F7 D7 not edi 41 23 FE and edi,r14d After: 41 8B FE mov edi,r14d 81 E7 FF FE FF FF and edi,0FFFFFEFFh - orc Before: 41 BE 04 00 00 00 mov r14d,4 41 F7 D6 not r14d 45 0B F5 or r14d,r13d After: 45 8B F5 mov r14d,r13d 41 83 CE FB or r14d,0FFFFFFFBh