On Wed, Jun 17, 2009 at 8:46 PM, Jakub Jelinekjakub@redhat.com wrote:
On Wed, Jun 17, 2009 at 02:41:54PM -0400, Bill Nottingham wrote:
Gregory Maxwell (gmaxwell@gmail.com) said:
Consider:
-Os on the x86 build?
Back when I tested before, -Os unilaterally made things worse across Athlon64/C2D/Atom.
Note that GCC 4.4 switches -Os on for unlikely executed basic blocks and/or unlikely executed functions (of course profile feedback helps here a lot, but even without it the heuristics gets it right in many cases), so forcing -Os for all code, even hot, is not a good idea. On the other side, compiling everything with -O3 is going to bloat code a lot, just compile with -O3 the hot compilation units or even better just hot functions.
Is this (bloated code) really a problem if the code runs faster?