From: Paul Brook <paul@codesourcery.com>
To: gcc@gcc.gnu.org
Cc: DJ Delorie <dj@redhat.com>, wilson@specifix.com
Subject: Re: hard_regno_nregs == 0 ?
Date: Wed, 09 Jan 2008 21:48:00 -0000 [thread overview]
Message-ID: <200801092147.55675.paul@codesourcery.com> (raw)
In-Reply-To: <200801092038.m09KcckZ026515@greed.delorie.com>
> @defmac HARD_REGNO_NREGS (@var{regno}, @var{mode})
> A C expression for the number of consecutive hard registers, starting
> at register number @var{regno}, required to hold a value of mode
> -@var{mode}.
> +@var{mode}. This macro must never return zero, even if a register
> +cannot hold the requested mode - indicate that with HARD_REGNO_MODE_OK
> +and/or CANNOT_CHANGE_MODE_CLASS instead.
I find this somewhat unclear - It seems to imply that HARD_REGNO_NREGS may be
called even when HARD_REGNO_MODE_OK returns false.
How about:
This macro must return a nonzero value for all combinations permitted by
HARD_REGNO_MODE_OK and CANNOT_CHANGE_MODE_CLASS.
Paul
next prev parent reply other threads:[~2008-01-09 21:48 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 20:13 DJ Delorie
2008-01-09 16:43 ` Ian Lance Taylor
2008-01-09 16:47 ` DJ Delorie
2008-01-09 16:56 ` Ian Lance Taylor
2008-01-09 20:18 ` Jim Wilson
2008-01-09 19:27 ` Jim Wilson
2008-01-09 20:39 ` DJ Delorie
2008-01-09 21:48 ` Paul Brook [this message]
2008-01-09 22:02 ` DJ Delorie
2008-01-11 0:12 ` Jim Wilson
2008-01-11 0:16 ` DJ Delorie
2008-01-12 0:48 ` Jim Wilson
2008-01-21 22:41 ` DJ Delorie
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