== Quote from Jonathan Crapuchettes (jcrapuchet...@gmail.com)'s article > 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
That's because the function called to perform the operation (_arraySliceExpDivSliceAssign_i) is not implemented in phobos - so a stock function is generated by the compiler instead. Regards
