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Re: Unexpected offsets when eliminating SP

From: Ian Lance Taylor <iant at google dot com>
To: Michael Hope <michaelh at juju dot net dot nz>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 29 Apr 2009 07:43:45 -0700
Subject: Re: Unexpected offsets when eliminating SP
References: <31d002d40904290301o40f783b9od980aa4843a24c62@mail.gmail.com>

Michael Hope <michaelh@juju.net.nz> writes:

> HI there.  I'm working on porting gcc to a new architecture which only
> does indirect addressing - there is no indirect with displacement.
>
> The problem is with spill locations in GCC 4.4.0.  The elimination
> code correctly elimates the frame and args pointer and replaces it
> with register X.  The problem is that it then generates indirect with
> offset loads to load spilt values.

It sounds like you need to use a secondary reload with a scratch
register, so that you have a register that you can set to the stack
frame address to use.  Look at the docs for TARGET_SECONDARY_RELOAD.

> Could someone point me in the right direction please?  Is it
> appropriate to ask such questions on this list?

Yes, questions about porting gcc are appropriate for this mailing list.

Ian

References:
- Unexpected offsets when eliminating SP
  - From: Michael Hope

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