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

[dewar@gnat.com]

<<Such flags would be well suited to cover different optimizations
with different architectures (as the -O flags already trigger
different optimizations depending on the architecture).
>>

The trouble with proliferation of flags is that it gets complicated for
people to even learn about them, let alone figure out what they do or
do not want.