On 2013-05-16, at 12:17 PM, Mike Duigou <mike.dui...@oracle.com> wrote: > I haven't looked at the details for the PCLMULQDQ instruction but a caryless > multiply could be of use to some of the crypto primitives as well (GHASH, > GMAC and probably others). Perhaps the property could be > "sun.hotspot.x64.clmulSupported" or something less specific to the usage.
Note that the instruction also works on 32-bit, and once the builds all use sufficiently modern compilers, the same source code works for both. > What's our actual experience with needing switches like -XX:-UseCLMUL > or-XX:-UseAVX for other features? Faulty implementations? Feature > misreporting? Performance regressions? Virtualization interactions? I haven't seen any virtualization problems -- I've also been testing on VMs, Ubuntu and Solaris on VMWare. Should I also give it a go in VirtualBox? What should I be looking for? David
