What is acceptable for -ffast-math? A numerical viewpoint

[Gabriel Dos_Reis]

| I opt for quite aggressive (and well documented) optimizations with
| -ffast-math (with a big warning in the documentation). But -ffast-math
| should not be turned on with -O2 by default. Maybe with -O3, but
| I think it's best to leave it to the user completely.

I'm not of the opinion that -ffast-math should automatically be turned
on at any level of optimization. It should be selected by the user.
In order words, current settings in that respect is fine.

-- Gaby