On Thu, Jul 14, 2011 at 1:39 PM, Matt Turner <mattst88@xxxxxxxxx> wrote: > Hi, > > I'm a bit confused about how CFLAGS related to ARM's iwmmxt > instruction set extensions are handled. > > On x86 to enable SSEx instructions, one would do something like > -march=... -msse3, but on ARM I must do something like -march=iwmmxt > (where I'd have expected -march=armv7 -miwmmxt). > > What flags would I use to optimize code for armv7 while enabling > iwmmxt instructions? -march=armv7 -mcpu=iwmmxt? > > Also, do I need to do anything with -mabi=iwmmxt? I think not, but.. > > Thanks, > Matt > > http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html There seems to be work in the direction of making this less insane. http://www.mail-archive.com/gcc-patches@xxxxxxxxxxx/msg08522.html Matt
