[PATCH] [AArch64] Refines the Cortex-A57 Machine Model

[Dave Estes]

All,

This new patchset moves the model back to out-of-order yet restricts the issue-width to the minimum of the actual issue width and dispatch width as Andy suggested. It brought the Spec2000/2006 numbers back up and even outperformed the original model by a few percent (geomean). It also improved the EEMBC numbers by a percent (geomean). I did see some degradation in individual tests, but nothing horrible. It will take some more detailed analysis to determine the cause there.

Jiangning,

In the meantime, if you can replicate the performance gain, then I'd like to move forward with this review, because the more accurate latency information will be key to future analysis and refinements.

Thanks...
-Dave

http://reviews.llvm.org/D5372