From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeffrey A Law <law@hurl.cygnus.com>
To: Michael Hayes <m.hayes@elec.canterbury.ac.nz>
Cc: Richard Henderson <rth@cygnus.com>, Jamie Lokier <egcs@tantalophile.demon.co.uk>, Marc Lehmann <pcg@goof.com>, egcs@cygnus.com
Subject: Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test 
Date: Fri, 25 Dec 1998 21:57:00 -0000
Message-id: <16940.914651694@hurl.cygnus.com>
References: <13956.18174.396993.213410@ongaonga.elec.canterbury.ac.nz>
X-SW-Source: 1998-12/msg00911.html

  In message < 13956.18174.396993.213410@ongaonga.elec.canterbury.ac.nz >you writ
e:
  > Why not use the extra condition to prevent the combination if the
  > first input does not match the output operand?
Because that can miss some valueable combination opportunities.  It is also
incorrect for a condition on a named pattern to reject any insn based on
anything other than the target flags.


jeff