On Tue, Oct 28, 2008 at 11:07:10AM -0600, Andrew Bell wrote: > On Tue, Oct 28, 2008 at 7:23 AM, Rohit Garg <rpg.314@xxxxxxxxx> wrote: > > Hi all, > > > > I have a small app. In it in a a particular place, I had a 2-3 > > functions being called from one main function. They were small > > functions (5-6 lines) and inline keyword was used. The performance was > > ......... HORRIBLE. > > > > -Winline didn't report any case of a function not being inlined. > > Perhaps this is suggesting the obvious, but gcc doesn't do inlining if > you aren't compiling with optimization. You get no warning in this > case from -Winline. And use -O3 optimization if you want the compiler to consider to do the inline automatically. If the function is still not being inlined, you can often tweak various parameters via --param to get the function inlined. Note, older versions of GCC would only inline a function if the function definition occurred before the use of the function. -- Michael Meissner, IBM 4 Technology Place Drive, MS 2203A, Westford, MA, 01886, USA meissner@xxxxxxxxxxxxxxxxxx
