registers on transputer

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1 total messages Started by Moshe Braner Fri, 20 Oct 1989 13:32

#342

Author: Moshe Braner
Date: Fri, 20 Oct 1989 13:32

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The simplest way to have "registers" on the transputer, and the
way it was meant to be used, is to use the low end of the
workspace.  Within 16 words of the workspace pointer you only
need a one-byte instruction to access the location, as in:
	ldl	offset
where offset is between 0 and 15.  (If the offset is larger then
you need prefix instruction bytes.)  Of course you still need to
do the actual memory access, so it's better if you put the workspace
on-chip.  In any case, ALL compilers need to use that approach
on the transputer so porting GCC to use this sort of "register"
shouldn't be _too_ bad.
- Moshe

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