On Jan 22, 1:23 am, Robert Relyea <rrel...@redhat.com> wrote: > Nelson B Bolyard wrote: > > Julien R Pierre - Sun Microsystems wrote, On 2009-01-21 15:03: > > >> Even if you end up building NSS with optimizations, they use the regular > >> multiply instructions, which performs best on AMD chips, but not as well > >> on Intel CPUs. For Intel, one needs to use the SSE2 and above > >> instructions set, which NSS currently doesn't do - except on one > >> platform, Linux. > > > Is there any reason why we can't use the same optimizations on Darwin/x86 > > as we use on Linux? > > If darwin/x86 uses gas, then it's should be just a matter of setting > some defines in the freebl make file and testing. (the primary thing > that holds back using these assembler optimizations is differences in > the assembler syntax on our various platforms). >
Unfortunately it doesn't use gas. I have modified the mpi_x86.s to use be able to compile it using gcc, but I have a question. The darwin mpi library is configured to use 64bits mp_digit (as ULONG_LONG_MAX is defined and long long are 64 bits), and so, the assembly file does not works. Now, if I use the MP_USE_UINT_DIGIT preprocessor flag, I can force it to defined mp_digit as 32 bits value, and it compiles fine (using the same sse2 assembly than linux). My first test shows a significant improvement: average: 1371 ms min: 389 ms, max: 2648 Is there a simple way to test if the generated values are correct ? -- dev-tech-crypto mailing list dev-tech-crypto@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-crypto
