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Re: RFC & patch: Rework MIPS command-line handling

From: Paul Koning <pkoning at equallogic dot com>
To: macro at ds2 dot pg dot gda dot pl
Cc: rsandifo at redhat dot com, gcc-patches at gcc dot gnu dot org, binutils at sources dot redhat dot com
Date: Fri, 12 Jul 2002 14:46:04 -0400
Subject: Re: RFC & patch: Rework MIPS command-line handling
References: <wvnfzyodh02.fsf@talisman.cambridge.redhat.com><Pine.GSO.3.96.1020712194308.7646E-100000@delta.ds2.pg.gda.pl>

>>>>> "Maciej" == Maciej W Rozycki <macro@ds2.pg.gda.pl> writes:

 Maciej> Hmm, what is "o64"?

That's the (unofficial?) name for "like o32 but with 64 bit
registers".  In other words, argument passing as with o32, but
registers are 64 bits and long long data goes in one register rather
than in a register pair.  mips3 opcodes for 64-bit operations are
used. 

This is an important case for embedded systems, which often need the
performance benefits of 64 bit operations.  N32 would be a good answer
except that it hasn't been available in the past, while o64 has been.

       paul

References:
- RFC & patch: Rework MIPS command-line handling
  - From: Richard Sandiford
- Re: RFC & patch: Rework MIPS command-line handling
  - From: Maciej W. Rozycki

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