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Date: Sat, 15 Mar 2003 00:06:00 -0000
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From: rakdver@atrey.karlin.mff.cuni.cz
Subject: Re: optimization/10080: Loop unroller nearly useless
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The following reply was made to PR optimization/10080; it has been noted by GNATS.

From: rakdver@atrey.karlin.mff.cuni.cz
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org,
	gcc-prs@gcc.gnu.org, falk.hueffner@student.uni-tuebingen.de
Cc:  
Subject: Re: optimization/10080: Loop unroller nearly useless
Date: Sat, 15 Mar 2003 00:59:36 +0100 (CET)

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=
 10080
 
 the problem is that ++i is translated into
 
 (insn 28 26 29 1 0x40135c40 (set (reg:DI 79)
         (plus:DI (reg/v:DI 72 [ i ])
             (const_int 1 [0x1]))) -1 (nil)
     (nil))
 (insn 29 28 75 1 0x40135c40 (set (reg/v:DI 72 [ i ])
         (sign_extend:DI (subreg:SI (reg:DI 79) 0))) -1 (nil)
     (nil))
 
 but my overly simplistic analysis does not recognize it.
 I am workning on fix.
 
 Zdenek