What is acceptable for -ffast-math? (Was: associative law incombine)

[Gabriel Dos_Reis]

| On Wed, 1 Aug 2001, Gabriel Dos_Reis wrote:
| >
| > | Now, show me a case where a/b/c -> a/(b*c) is significantly less accurate?
| >
| > On a 64-bit double processor just take
| 
| Oooh.. Quoting me out-of-context.

You requested an example. I gave one.

Then for your the purpose of your rhetorics, you said 

   Let's confine this to x86 - it is the most common case by far, and hey,
   especially when it comes to games etc I doubt it matters what HP-PA does,
   for example. We can easily make the optimizations be enabled on a
   per-architecture basis.

I gave a pretty much fair example to illustrate the point that the
transformation does affect the result on 64-bit double processors
example -- they are quite common.

Be honest and admit that you're getting to the point of requesting a
feature for a very specific target where you know the transformation
is safe.  Which is pretty much different from the previous "it won't
matter" stance.

-- Gaby