Re: Why I've Dropped In

quadibloc <quadibloc@gmail.com> schrieb:

Since the basis of the ISA is a RISC-like ISA,

[...]

3) Use only four base registers instead of eight.
4) Use only three index registers instead of seven.
5) Use only six index registers instead of seven, and use only four base
registers instead of eight when indexing is used.

Having different classes of base and index registers is very
un-RISCy, and not generally a good idea.  General purpose registers
is one of the great things that the /360 got right, as the VAX
later did, and the 68000 didn't.