Hi Florian, The performance gain that I reported was over the earlier implementation of GHASH using clmul instructions (generate_ghash_process_blocks). Regards, Smita
-----Original Message----- From: Florian Weimer [mailto:fwei...@redhat.com] Sent: Monday, November 19, 2018 1:55 PM To: Kamath, Smita <smita.kam...@intel.com> Cc: 'Vladimir Kozlov' <vladimir.koz...@oracle.com>; Anthony Scarpino <anthony.scarp...@oracle.com>; core-libs-dev@openjdk.java.net; hotspot compiler <hotspot-compiler-...@openjdk.java.net> Subject: Re: RFR(S)JDK-8214074: Ghash optimization using AVX instructions * Smita Kamath: > I'd like to contribute an optimization for GHASH Algorithm using AVX > Instructions. I have tested this optimization on SKX x86_64 platform > and it shows ~20-30% performance improvement for larger message sizes > (for example 8k). Performance improvement against what? The pure Java implementation? I find this a bit surprising. I would have expected a much larger performance improvement from the use of CLMUL instructions. Thanks, Florian
