openssl/crypto/chacha/asm
Andy Polyakov 64d92d7498 x86_64 assembly pack: "optimize" for Knights Landing, add AVX-512 results.
"Optimize" is in quotes because it's rather a "salvage operation"
for now. Idea is to identify processor capability flags that
drive Knights Landing to suboptimial code paths and mask them.
Two flags were identified, XSAVE and ADCX/ADOX. Former affects
choice of AES-NI code path specific for Silvermont (Knights Landing
is of Silvermont "ancestry"). And 64-bit ADCX/ADOX instructions are
effectively mishandled at decode time. In both cases we are looking
at ~2x improvement.

AVX-512 results cover even Skylake-X :-)

Hardware used for benchmarking courtesy of Atos, experiments run by
Romain Dolbeau <romain.dolbeau@atos.net>. Kudos!

Reviewed-by: Rich Salz <rsalz@openssl.org>
2017-07-21 14:07:32 +02:00
..
chacha-armv4.pl Remove trailing whitespace from some files. 2016-10-10 23:36:21 +01:00
chacha-armv8.pl Remove trailing whitespace from some files. 2016-10-10 23:36:21 +01:00
chacha-c64xplus.pl Add OpenSSL copyright to .pl files 2016-05-21 08:23:39 -04:00
chacha-ppc.pl PPC assembler pack: add some PPC970/G5 performance data. 2016-11-11 13:24:52 +01:00
chacha-s390x.pl s390x assembly pack: improve portability. 2016-06-06 11:08:04 +02:00
chacha-x86.pl Remove filename argument to x86 asm_init. 2017-05-11 17:00:23 -04:00
chacha-x86_64.pl x86_64 assembly pack: "optimize" for Knights Landing, add AVX-512 results. 2017-07-21 14:07:32 +02:00