On 11/11/2012 07:59 PM, Xin Tong wrote: > On Sun, Nov 11, 2012 at 2:54 PM, Andrew Haley <aph@xxxxxxxxxx> wrote: >> On 11/11/2012 07:47 PM, Xin Tong wrote: >>> when gcc is set to compile for minimal code size, what kind of >>> optimizations does gcc apply in comparison to compile for performance >>> ? or it is just gcc spends more time doing the compilation, selecting >>> instruction sequences that are optimal for code size. >> >> No. GCC does all optimizations *except* those known to increase >> program size. This usually works pretty well, but isn't perfect. >> > so as to how the instructions are selected. compiling for code size > does not have an effect ? Please don't top-post on this list. Any target could, in principle, select instructions based on size and -OS, but I don't know any that do. Andrew.
