massimiliano cialdi wrote: > I use gcc 4.2.2 and I tried both -O0 and -O1. > If I use -O1 I can see that use of stack is better. > In gcc manual (http://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Optimize-Options.html#Optimize-Options) > is reported that -O1 activate > -fdefer-pop > -fdelayed-branch > -fguess-branch-probability > -fcprop-registers > -fif-conversion > -fif-conversion2 > -ftree-ccp > -ftree-dce > -ftree-dominator-opts > -ftree-dse > -ftree-ter > -ftree-lrs > -ftree-sra > -ftree-copyrename > -ftree-fre > -ftree-ch > -funit-at-a-time > -fmerge-constants > > so in gcc command line I have replaced -O1 with all these parameters, > but I obtain a larger binary and a worst stack usage. Is the same > thing of -O0. Right. > How can I reproduce -O1 behaviour using simple command line parameter? You can't have optimization without -O. Andrew.
