To get complete 32 bit inverse :
x=((x>>1)&0x55555555) | ((x<<1)&0xAAAAAAAA);
x=((x>>2)&0x33333333) | ((x<<2)&0xCCCCCCCC);
x=((x>>4)&0x0F0F0F0F) | ((x<<4)&0xF0F0F0F0);
x=((x>>8)&0x00FF00FF) | ((x<<8)&0xFF00FF00);
x=((x>>16)&0x0000FFFF) | ((x<<16)&0xFFFF0000);
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