"William M. Quarles" <walrus@xxxxxxxxxxxxx> writes: > Are MMX and SIMD instruction capabilities included in GCC now? Yes. There are both intrinsics and also optimization flags to enable automatic generation of them. See http://xrl.us/b43h and search for -mfpmath and -mmmx for optimization flags, http://xrl.us/b43i for vector intrinsics, and http://xrl.us/b43k for platform specific x86 builtins, including mmx and sse[2] builtins.