Quote:
Originally Posted by NiLuJe
@twobob:
K2/3: ARCH_FLAGS="-march=armv6j -mtune=arm1136jf-s -mfpu=vfp"
K4/5: ARCH_FLAGS="-march=armv7-a -mtune=cortex-a8 -mfpu=neon" (or -mfpu=vfpv3, which might in fact be a better choice right now, even with the latest Linaro GCC series, I have some benchmarks to do...)
The rest might start an unholy war, but I'd go with at least:
-O2 -ffast-math ${ARCH_FLAGS} -pipe -fomit-frame-pointer (unless you care about debugging stuff, in which case you'll want to replace all this with -O0 -g3 ${ARCH_FLAGS} -pipe -fno-omit-frame-pointer). (FWIW, Linaro recommends using -O3 or -Ofast on armv7... Again, I have some benchmarks to do  ).
Unless you know that -ffast-math is going to break something, which should be approximately never, except for some really, really specific use cases. |
This post is of constant help to me.
Thanks Niluje.