gnupic: SDCC register optimization
Subject:
SDCC register optimization
From:
Scott Dattalo ####@####.####
Date:
2 Jul 2002 15:52:22 -0000
Message-Id: <Pine.LNX.4.44.0207020828480.1585-100000@ruckus.brouhaha.com>
A new register optimization algorithm has been added to SDCC. This should
tremendously help applications that use pointers. For example, the
regression program pointer1.c:
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/sdcc/sdcc/src/regression/pointer1.c
when compiled with the latest version of SDCC saves 25 registers:
$ sdcc -S -mpic14 pointer1.c
*** Saved 11 registers ***
*** Saved 12 registers, total saved 23 ***
*** Saved 2 registers, total saved 25 ***
That's 25 out of the 40 originally declared! There's still room for
improvement, but this is a fairly significant enhancement that a few of
you can benefit from.
Scott
