optimization

The C Users guide says that programs compiled with '-fast' must be linked with '-fast'

-fast means:

-dalign

-fns

-fsimple=2

-ftrap=%none

-nofstore

-xarch

-xbuiltin=%all

-xlibmil

-xtarget=native

-x05

Not using some of these flags at link time will either cause core

dumping or incorrect results.

never to use -fast. -fast is merely a

macro which expands to real options. Any sensible application should pick

the options (perhaps based on -fast as a basis, but not accept that

it can change at any time, without notice ...

-fast exists for easy benchmarking ... essentially what's the best

first guess at what will give fast performance on this particular

machine. It's not a good idea for a serirous application, they ought to spend a little time ... at least enough to tickle the compiler to get the

-fast expansion ... look at anything interesting and different from

the last time they looked and use the expansion directly themselves.

That way, -fast won't change out from under them in surprising ways

at a later date

-Ngoc

NgocNguyen at 2007-7-6 21:31:28 >