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Re: Partial registers in asm constraints/clobber lists

From: Ian Lance Taylor <iant at google dot com>
To: Jeremy Hall <gcc dot hall at gmail dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Mon, 21 May 2012 11:55:49 -0700
Subject: Re: Partial registers in asm constraints/clobber lists
References: <CADJRTM2O1gXVy76uG3k6H4UwN-8ydw4bEDuuN33Z0SSZ4sqnzg@mail.gmail.com>

Jeremy Hall <gcc.hall@gmail.com> writes:

> Is it safe to mention part of a register only in a constraint or clobber list?

Yes.

> Does gcc treat registers as a whole so that a mention of any part of a
> register refers to all of it (e.g. register "a").

Yes.

Ian

References:
- Partial registers in asm constraints/clobber lists
  - From: Jeremy Hall

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