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4c22909e31
the remainder left in %edx. Here is the resulting performance improvement matrix (improvement as a result of this *and* previous tune-up committed two days ago). The results were obtained by profiling the "div" part of the crypto/bn/bnspeed.c. CPU BN_div bn_div_words overall comment ------------------------------------------------------------------------ PII +16% accumulated by +2-3% PII multiplies damn fast! Taking inlining multiplication out of the loop didn't make too much difference. Eliminating of the multiplication involved in remainder calculation is the major factor. Pentium +45% accumulated by +7-9% mull isn't that fast and replacing inlining multiplications with additions in the loop has more visible effect:-) MIPS +75% +12% +20-25% In addition to the taking mults R10000 out of the loop (giving 12% in the asm/mips3.s) three mults were eliminated in BN_div. Alpha +30% +50% +10-15% Same as above. But remember that EV4 bn_div_words is a C implementation. It takes 4 Alpha mults in C to do the same thing as 1 MIPS mult in assembler does. So the effect (50%) is more impressive. But not the overall one... Well, if Alpha bn_mul_add would be implemented in assembler overall improvement would be closer to MIPS... |
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|---|---|---|
| .. | ||
| asm | ||
| old | ||
| .cvsignore | ||
| bn_add.c | ||
| bn_asm.c | ||
| bn_blind.c | ||
| bn_comba.c | ||
| bn_div.c | ||
| bn_err.c | ||
| bn_exp2.c | ||
| bn_exp.c | ||
| bn_gcd.c | ||
| bn_lcl.h | ||
| bn_lib.c | ||
| bn_mont.c | ||
| bn_mpi.c | ||
| bn_mul.c | ||
| bn_opts.c | ||
| bn_prime.c | ||
| bn_prime.h | ||
| bn_prime.pl | ||
| bn_print.c | ||
| bn_rand.c | ||
| bn_recp.c | ||
| bn_shift.c | ||
| bn_sqr.c | ||
| bn_word.c | ||
| bn.h | ||
| bn.mul | ||
| bnspeed.c | ||
| bntest.c | ||
| comba.pl | ||
| d.c | ||
| exp.c | ||
| expspeed.c | ||
| exptest.c | ||
| Makefile.ssl | ||
| new | ||
| test.c | ||
| todo | ||
| vms-helper.c | ||