Patch gcc-4.0 should not apply mathematical associative rules for addition or multiplication

[Gabriel Dos Reis]

Geoffrey Keating <geoffk@geoffk.org> writes:

[...]

| > + static inline bool
| > + associative_fp_binop (tree exp)
| > + {
| > +   enum tree_code code = TREE_CODE (exp);
| > +   return !(!flag_unsafe_math_optimizations
| 
| This flag is not clearly the right one.  Why did you pick it from the
| alternatives?

That flag is clearly the right flag to pick.  See the explanation he gave.
It contains an example that illustrates the problem too.

-- Gaby