9.29.2.4 Assembler Extensions

@rN
As destination operand being treated as ‘ 0(rn)
0(rN)
As source operand being treated as ‘ @rn
jCOND +N
Skips next N bytes followed by jump instruction and equivalent to ‘ jCOND $+N+2

Also, there are some instructions, which cannot be found in other assemblers. These are branch instructions, which has different opcodes upon jump distance. They all got PC relative addressing mode.

beq label
A polymorph instruction which is ‘ jeq label ’ in case if jump distance within allowed range for cpu's jump instruction. If not, this unrolls into a sequence of
            jne $+6
            br  label

bne label
A polymorph instruction which is ‘ jne label ’ or ‘ jeq +4; br label
blt label
A polymorph instruction which is ‘ jl label ’ or ‘ jge +4; br label
bltn label
A polymorph instruction which is ‘ jn label ’ or ‘ jn +2; jmp +4; br label
bltu label
A polymorph instruction which is ‘ jlo label ’ or ‘ jhs +2; br label
bge label
A polymorph instruction which is ‘ jge label ’ or ‘ jl +4; br label
bgeu label
A polymorph instruction which is ‘ jhs label ’ or ‘ jlo +4; br label
bgt label
A polymorph instruction which is ‘ jeq +2; jge label ’ or ‘ jeq +6; jl +4; br label
bgtu label
A polymorph instruction which is ‘ jeq +2; jhs label ’ or ‘ jeq +6; jlo +4; br label
bleu label
A polymorph instruction which is ‘ jeq label; jlo label ’ or ‘ jeq +2; jhs +4; br label
ble label
A polymorph instruction which is ‘ jeq label; jl label ’ or ‘ jeq +2; jge +4; br label
jump label
A polymorph instruction which is ‘ jmp label ’ or ‘ br label