> Hi, > I wanted to understand the difference of using march vs mcpu as argument > to gcc. > I am compiling my code for a cortex-A8 CPU, what would be better to use: > > -mcpu=cortex-a8 or -march=armv7-a -mcpu=cortex-a8 will perform specific optimisations for the Cortex-A8 such as instruction scheduling and will produce better performing code on that core. -march=armv7-a just selects the ARMv7-a architecture which tells the compiler that it can use the instructions in ARMv7-a, but it will not perform any core-specific performance tuning. If you know that you'll be running your code on a Cortex-A8 you should specify -mcpu=cortex-a8, it also automatically implies -march=armv7-a. For more information on the options available for ARM you can look at: http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html HTH, Kyrill > > Thanks, > Channa
