From: kenner@vlsi1.ultra.nyu.edu (Richard Kenner)
To: segher@koffie.nl
Cc: gcc-patches@gcc.gnu.org
Subject: Re: rs6000 fused multiply-add patch [+ patchlet]
Date: Fri, 10 Jan 2003 02:15:00 -0000 [thread overview]
Message-ID: <10301100218.AA27058@vlsi1.ultra.nyu.edu> (raw)
Reducing the amount of rtl isn't the same as improving performance.
No, but unless the MD file has a serious problem, it is *one way* of
improving performance.
The only difference in this regard is that the original combine
is easier to prove to be terminating.
And that it sticks to the semantics, which is *combining* insns.
There's no question that we don't current have a pass which is good at
finding the simplest form of the RTL. The idea is to move as much of
combine as possible into simplify-rtx.c. Then combine is very small and
other passes will do what you are trying to do.
next reply other threads:[~2003-01-10 2:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-10 2:15 Richard Kenner [this message]
2003-01-12 1:38 ` Segher Boessenkool
-- strict thread matches above, loose matches on Subject: below --
2003-01-06 22:09 Richard Kenner
2003-01-02 1:39 Richard Kenner
2003-01-04 1:59 ` Segher Boessenkool
2002-12-31 3:59 Richard Kenner
2003-01-05 23:24 ` Zack Weinberg
2003-01-06 2:26 ` David Edelsohn
2003-01-06 4:02 ` Segher Boessenkool
2003-01-06 4:07 ` Segher Boessenkool
2003-01-06 23:21 ` Geoff Keating
2003-01-09 22:41 ` Segher Boessenkool
2002-12-30 4:58 Richard Kenner
2002-12-30 20:17 ` Segher Boessenkool
2002-12-30 20:51 ` David Edelsohn
2003-01-02 0:52 ` Segher Boessenkool
2003-01-02 1:44 ` Geoff Keating
2003-01-04 1:59 ` Segher Boessenkool
2002-12-29 5:13 Richard Kenner
2002-12-29 19:25 ` Segher Boessenkool
2002-12-03 17:29 rs6000 fused multiply-add patch David Edelsohn
2002-12-04 19:41 ` Segher Boessenkool
2002-12-05 14:04 ` Geoff Keating
2002-12-20 21:08 ` rs6000 fused multiply-add patch [+ patchlet] Segher Boessenkool
2002-12-20 21:38 ` Geoff Keating
2002-12-20 22:21 ` Segher Boessenkool
2002-12-20 22:28 ` David Edelsohn
2002-12-21 21:55 ` Geoff Keating
2002-12-28 22:08 ` Segher Boessenkool
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