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Re: Compiling without the use of static registers in IA-64

From: Jim Wilson <wilson at specifix dot com>
To: mcrosier at ncsu dot edu
Cc: gcc at gcc dot gnu dot org, bviyer at ncsu dot edu
Date: Tue, 13 Mar 2007 14:42:24 -0700
Subject: Re: Compiling without the use of static registers in IA-64
References: <57451.152.14.22.121.1173798878.squirrel@webmail.ncsu.edu>

mcrosier@ncsu.edu wrote:

I was wondering if anyone knew how I could modify gcc to not use static
general purpose registers on an IA-64 machine?

Besides the -ffixed-reg option Vlad mentioned, there is also a documented IA-64 specific option for this. See the docs. No reason why this option needs to be IA-64 specific though; it was just implemented that way for convenience before the IA-64 port was contributed to the FSF.

You may have trouble with 64-bit constants if you disable r2/r3. There are only four regs that work with the addl instruction, and you have just disallowed all of them. You might need other changes to make this work. -- Jim Wilson, GNU Tools Support, http://www.specifix.com

References:
- Compiling without the use of static registers in IA-64
  - From: mcrosier

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