[Emacs.app dev]: Fwd: bogus optimization -03 in Emacs.app compile script

[Peter Dyballa]

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Von: Mike Mattie <[EMAIL PROTECTED]>
Datum: 7. Januar 2008 13:46:35 MEZ
An: Peter Dyballa
Betreff: bogus optimization -03 in Emacs.app compile script
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Hello,

could you pass this on to the Emacs.app folks ?


-O3 is a terrible optimization flag.


manuals should be playing with this kind of aggressive optimization.


after the pentium. Frankly it's for domain experts these days. If you

going to blow your own foot off, when the only benefit is a borderline
1-2% gain *if you are lucky*.


from:   http://www.gentoo.org/doc/en/gcc-optimization.xml

-O3: This is the highest level of optimization possible, and also

behavior of gcc has changed significantly since version 3.x. In 3.x,
-O3 has been shown to lead to marginally faster execution times over
-O2, but this is no longer the case with gcc 4.x. Compiling all your
packages with -O3 will result in larger binaries that require more

or unexpected program behavior (including errors). The downsides
outweigh the benefits; remember the principle of diminishing returns.
Using -O3 is not recommended for gcc 4.x.

I wanted to double-check that my assumptions were right, and sure enough Disregarding the general guidelines of the gcc developers is occasionally warranted, but only people who have practically memorized the intel/ ppc I started out programming in assembly, but I stopped reading the manuals haven't taken a degree in compiler design & implementation you are likely the riskiest. It will take a longer time to compile your code with this option, and in fact it should not be used system-wide with gcc 4.x. The memory, and will significantly increase the odds of compilation failure

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