middle-end/5100: Wrong register class selected by find_valid_class

[Richard Henderson]

The following reply was made to PR middle-end/5100; it has been noted by GNATS.

From: Richard Henderson <rth@redhat.com>
To: Marco Altieri <maltieri@nergal.it>
Cc: rth@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   lonardo@nergal.it, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: middle-end/5100: Wrong register class selected by find_valid_class
Date: Mon, 15 Apr 2002 10:03:47 -0700

 On Mon, Apr 15, 2002 at 03:32:51PM +0200, Marco Altieri wrote:
 > So, the algorithm in find_valid_class selects EVEN_REGS for a
 > mode == Pmode and n==1.
 
 Sounds like you should actually get an abort, since no class is
 valid for Pmode.  Seems to me your bug is that Pmode should be
 able to be *held* in any pair of registers, odd or even, but can
 only be *used* in even registers.
 
 
 r~