Re: Should -fcross-jumping be part of -O1?

[Scott Robert Ladd <coyote at coyotegulch dot com>]

Zack Weinberg wrote:
> Incidentally, Scott, I would encourage you to submit patches for 3.4
> that adjust the default optimization sets, if you can find
> better-in-general settings.

The problem is finding a single set of optimizations that works well for 
all types of code. A flag that optimizes one section of a program may 
pessimize another. In many of my tests, a few options vastly improve the 
performance of a given algorithm, while one or two other options 
pessimize the same code.

That said, I have tentatively identified some general improvements. I 
need to carefully look at code size and compile times before doing 
something like adding -ftracer to -O3. Then I'll likely submit a patch 
or two, even if I don't have a contract.

;)

[sarcasm: on]
Of course, now that I understand how GCC development works, I'm more 
than happy to accept any dollars (euros, yen, etc.) sent my way. I 
wouldn't want to do anything as a public service, and undermine the 
financial incentives enjoyed by so many.
[sarcasm: off]

..Scott "Please send money" Ladd

--
Scott Robert Ladd
Coyote Gulch Productions (http://www.coyotegulch.com)
Software Invention for High-Performance Computing