Hello everyone,
I am currently downloading a gentoo amd64 livedvd for my system as
well as taking notes regarding how I'll build my installation of LFS and I
am not sure about the CFLAGS I will use to build it. Here's the flags I've
chosen after reviewing the
http://gcc.gnu.org/onlinedocs/gcc-4.5.3/gcc/i386-and-x86_002d64-Options.html
web page:
-O2 -march=native -mtune=native -mavx -mfpmath=sse -msse2avx -pipe
The rationale behind the avx flags (as well as the mfpmath=sse flags) is
because, on amd64, 64bit sse math (yes it make the mfpmath=sse keyword
redundant) is used by default by gcc while on 32bit x86 cpu, the default is
80bit extended precision (64bit mantissa) and furthermore, I want to program
my nvidia gpu using cuda and the double precision math on it is 64bit (53bit
mantissa, 10bit exponent, 1bit sign, same as amd64) and would like the same
precision math in my programs.
Should I be okay with these flags?
Thanks
Alain
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