Changes between Version 2 and Version 3 of Ticket #28326, comment 8


Ignore:
Timestamp:
Nov 6, 2018, 5:38:12 PM (15 months ago)
Author:
tpearson-raptor
Comment:

Legend:

Unmodified
Added
Removed
Modified
  • Ticket #28326, comment 8

    v2 v3  
    22> https://bearssl.org/ctmul.html has some more information.
    33
    4 The listed CPUs are very old.  POWER9 has constant time multiplication via the mulhd/mulhdu and mulld commands (min latency 5, max latency 5); POWER8 has constant time multiplication via the vmul<xxx> commands (latency 7, no variance).
     4The listed CPUs are very old.  POWER9 has constant time multiplication via the mulhd/mulhdu and mulld instructions (min latency 5, max latency 5); POWER8 has constant time multiplication via the vmul<xxx> instructions (latency 7, no variance).
    55
    66See the POWER8 processor user guide [1], Performance Profile section and the POWER9 processor user guide [2], Appendix A for details.