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| author | Thiago Macieira <thiago.macieira@intel.com> | 2022-04-25 14:21:34 -0700 |
|---|---|---|
| committer | Thiago Macieira <thiago.macieira@intel.com> | 2022-04-26 19:38:12 -0700 |
| commit | f02879a97a6e7587a7e116f85d6a153f616a5d3f (patch) | |
| tree | e0e6caf0f3adbe8b4c3121e7b8d880b4a75d5e6a /src/widgets | |
| parent | f3640d908633b0e512077f24c41eca851879f0ed (diff) | |
QFutureInterface: insert x86 PAUSE in tight CMPXCHG loop
From the Intel Software Optimization Manual[1], Chapter 11 ("Multi-core
and Hyper-Threading Technology"), offers:
User/Source Coding Rule 14. (M impact, H generality) Insert the PAUSE
instruction in fast spin loops and keep the number of loop repetitions
to a minimum to improve overall system performance.
See section 11.4.2 for an explanation of why this is a good idea.
[1] https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html#inpage-nav-5
Pick-to: 6.3
Change-Id: I7fb65b80b7844c8d8f26fffd16e94088dad1ceee
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Diffstat (limited to 'src/widgets')
0 files changed, 0 insertions, 0 deletions