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Johannes Sixt schrieb:
> - Adding all those optimization options, -funroll-loops
> -minline-all-stringops
> etc. to the default compile line is a big NO-NO. It may be convenient for
> you, but it is not good practice in general. Is there any harm done if I
> remove them?
Typically and in most cases, it is just sufficient to use -O3
The compiler has sensible defaults for most cases.
In the Patch I see the line
CPU_CFLAGS=" -march=athlon64 -funroll-loops -minline-all-stringops
-ffast-math -mmmx -msse -msse2
- -msse3 -m3dnow -DHAVE_MMX -DUSE_MMX -DHAVE_3dnow $CPU_CFLAGS"
This is a lot of redundant and superfluos information. As far as I am informed,
the only thing you *really* should switch on for AMD64 is the switch -msse3
This includes all previous SSE levels and superseedes MMX and 3DNow!
So, at least the line should be for X86_64:
CPU_CFLAGS=" -march=athlon64 -msse3 ..........
What are the "-DHAVE_MMX -DUSE_MMX -DHAVE_3dnow" good for?
Does anyone know?
Hermann V.
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