--- Comment #5 from steven at gcc dot gnu dot org 2009-02-06 21:41 ---
We have a new candidate: bswap optimization.
Diego's idea to do a single scan that calls back to all these transformations
on every statement really still sounds like The Right Thing to do.
--
steven at gcc dot
--- Comment #6 from rguenth at gcc dot gnu dot org 2009-02-06 22:29 ---
Only they all run at different times during the pass pipeline ;)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32390
--- Comment #7 from steven at gcc dot gnu dot org 2009-02-06 22:43 ---
Then they should be grouped. And kept grouped.
Here's one case where there has to be a trade-off between micro-optimizations
for specific cases, and compile time for everyone. Please, for once, let us
seriously
--- Comment #8 from rguenth at gcc dot gnu dot org 2009-02-06 22:51 ---
Sure. There's this other problem of testsuite regressions you'll get. I've
been
there, it takes a _lot_ of time to do even minimal pass re-ordering / removing
:(
The best strathegy was always to fix deficiencies
--- Comment #1 from rguenth at gcc dot gnu dot org 2007-06-18 13:56 ---
All three transformations are done at different stages of the optimization
pipeline due to various reasons.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32390
--- Comment #2 from dnovillo at google dot com 2007-06-18 14:00 ---
Subject: Re: tree-ssa-math-opts.c performs too
many IL scans
On 6/18/07 9:56 AM, rguenth at gcc dot gnu dot org wrote:
--- Comment #1 from rguenth at gcc dot gnu dot org 2007-06-18 13:56
---
All three
--- Comment #3 from ubizjak at gmail dot com 2007-06-18 17:40 ---
(In reply to comment #2)
We need a better explanation than this. Uros agreed to summarize the
IRC discussion to close this issue. It'd be useful if we keep that same
discussion on the source code itself.
The need
--- Comment #4 from paolo dot bonzini at lu dot unisi dot ch 2007-06-19
05:09 ---
Subject: Re: tree-ssa-math-opts.c performs too
many IL scans
We have reciprocal pass (in fact CSE recip pass) that CSEs 1.0/z from x/z,
y/z,
.../z. This is done by scanning function for RDIV_EXPR,
