You can use the predefined symbols r0 through r15 to refer to the D10V registers. You can also use sp as an alias for r15. The accumulators are a0 and a1. There are special register-pair names that may optionally be used in opcodes that require even-numbered registers. Register names are not case sensitive.
Register Pairs
r0-r1r2-r3r4-r5r6-r7r8-r9r10-r11r12-r13r14-r15The D10V also has predefined symbols for these control registers and status bits:
pswbpswpcbpcrpt_crpt_srpt_emod_smod_eibaf0f1c