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From: d89.p-eriksson@linus.ida.liu.se (Peter Eriksson)
Newsgroups: gnu.gcc
Subject: HARD_REGNO_NREGS (help needed)
Message-ID: <1990Jan7.011434.19259@isy.liu.se>
Date: 7 Jan 90 01:14:34 GMT
Sender: news@isy.liu.se (Lord of the News)
Reply-To: d89.p-eriksson@linus.ida.liu.se
Distribution: gnu
Organization: Dept of EE, University of Linkoping
Lines: 18


I am a bit confused with the macro HARD_REGNO_NREGS in the tm-{machine}.h
header file. I'm trying to write a machine description for the Prime 
50-series computers, but I'm not sure how this macro is supposed to work.
Perhaps someone can help me with it? The Prime has 8 general registers, 
2 floating point registers that can be used as 1 TFmode or 2 SFmode or DFmode.
And two "base" registers, XB (general) and SB (stack base). I've written
the macro like this:

#define HARD_REGNO_NREGS(REGNO,MODE) \
  ((REGNO) < 8 ? ((GET_MODE_SIZE(MODE) + UNITS_PER_WORD - 1) /
                  UNITS_PER_WORD) : ((REGNO) == 8 && (MODE) == TFmode 
                      ? 2 : 1))

However, I'm not sure this is correct. I have tried looking at the machine
descriptions for other CPU:s but... 

/* Peter Eriksson (InterNet: d89.p-eriksson@linus.ida.liu.se) */