Mathieu Lacage wrote: > hi, > > I have a piece of code which does roughly this (after inlining): > > Foo *foo1 = bar (ctx); > foo1->something (); > Foo *foo2 = bar (ctx); > foo2->something (); > > bar is a function which will always return the same value if its input > is the same value (and ctx is constant over the function body) so, I > would like to instruct gcc that he can optimize away the second call > to bar but I could not find any obvious way to do this. Is this a > really stupid idea or did I miss something obvious ? Look at the 'pure' and 'const' attributes that can be applied to functions. These are GCC extensions, but one of them will be appropriate for your example. -- Kevin P. Fleming Digium, Inc. | Director of Software Technologies 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA skype: kpfleming | jabber: kpfleming@xxxxxxxxxx Check us out at www.digium.com & www.asterisk.org
