Jonathan Crapuchettes wrote:
Michael Parrott wrote:
Jonathan Crapuchettes Wrote:
I followed the example in issue #30:
http://bitbucket.org/goshawk/gdc/issue/30/d_inlineasm-updates
DFLAGS='-O2 -g -frelease -march=pentium3' ../configure --enable-languages=d
--disable-multilib --disable-shared
Is this wrong?
JC
Michael Parrott wrote:
Jonathan Crapuchettes Wrote:
I have been trying to add the SSE2 array operation code to the compilation,
but
it seems like the DFLAGS variable isn't being used. Can you offer any
suggestions?
Thank you,
JC
Did you set DFLAGS before running configure? If you didn't, that might be why.
Example:
DFLAGS="-g"
export DFLAGS
../configure --enable-languages=d .....
make
sudo make install
Something like that should work.
No, that should be fine.
What is wrong when you do that? Are there errors when you build? Does Phobos
not seem to be taking advantage of the SSE operations?
In phobos/internal/array{byte, double, float, int, short}.d, you need to
uncomment the sections labelled "version (D_InlineAsm_X86)" to enable the ASM
code.
I did uncommented the version sections, but thank you for the reminder.
I can tell that the SSE code is not being used because I compared two pieces of
code:
for (int i = 0; i < a.length; i++)
c[i] = a[i] / 1000;
and
c[] = a[] / 1000;
They should produce the same result and they do, but the array operation code
should be much faster. I base this assumption off of the same speed test using
DMD. The execution time for the two code segments, produced by GDC, are about
the same. I also compared the assembly for the objects created by GDC and DMD.
The GDC code is not using the SSE code as specified in the arrayDouble.d file,
but the DMD code is.
If you have suggestions, I am all ears.
Thank you for taking the time to help me,
JC
Michael and Iain,
Thank you for your input. I just realized what my mistake was and now feel like
I have wasted you time. The issue was that I was compiling the compiler as
x86_64, which I need, and the version tag for the SSE2 is D_InlineAsm_X86 not
D_InlineAsm_X86_64.
I'm thinking that I might play with converting the code in arrayDouble.d to
x86_64, but I wouldn't hold my breath.
Thank you again for your help,
JC
