From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Meissner <meissner@cygnus.com>
To: law@cygnus.com
Cc: egcs@cygnus.com
Subject: Re: i386 performance problem due to regmove.c change
Date: Sun, 28 Jun 1998 14:30:00 -0000
Message-id: <199806282130.RAA14684@rtl.cygnus.com>
X-SW-Source: 1998-06/msg01031.html

|   > I seem to be seeing around a 3 percent performance hit when
|   > running the crafty chess benchmark and the Brl-Cad raytracing
|   > benchmarks on an Intel Pentium II with:
|   > 
|   > Thu Jun 11 14:50:02 1998  Michael Meissner  <meissner@cygnus.com>
|   > 
|   > 	* regmove.c (regmove_optimize): If we can't replace the
|   > 	destination in an insn that sets the source, generate an explicit
|   > 	move of the source to the destination.
|   > 	(copy_src_to_dest): New function.
|   > 
|   > installed.  If I remove this patch then life gets better (not to
|   > mention faster :-).
| I would be very curious to know if this performance regression went
| away after my changes to recompute register set/reference counts.

Also there was a fix on June 15th that helped things along.  If you could
compile the source that slows down with the new regmove using the -save-temps
option and send us the .i or .ii file, it would be helpful.