Consider ColdFire Opcodes

[nonarkitten]

There are some really good ColdFire opcodes we can include that won't confuse core auto-detection. What this would allow is the use of a more modern compiler like CodeWarrior, which might produce better code than gcc?

• bitrev; reverse the order of all 32-bits
• byterev; reverse the byte-order of all 4 bytes
• ff1; find the first '1' bit
• mov3q; move a 3-bit immediate to arbitrary EA
• mvs; move and sign-extend in one operations
• mvz; move and zero-extend in one operations
• rems/remu; like divs/divu but only get remainder
• sats; if operation overflows, saturate to +/- INT MAX
• tpf; 2, 4 or 6-byte NOP