#8578: Improvements to SpinLock implementation -------------------------------------+------------------------------------ Reporter: parcs | Owner: parcs Type: task | Status: patch Priority: normal | Milestone: Component: Runtime System | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by thoughtpolice): Ah, yes, you're right - I did some more digging. The tricky bit is that `rep; nop` and `pause` actually have the same opcodes (`F390`) for backwards compatibility, but on newer CPUs, `rep; nop` is treated magically (allowing other hyperthreads on the same core), and `pause` is simply an alias to make it more clear. In that case, ignore me and my inability to keep up with Intel shenanigans. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8578#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler