comex b597ec3e08 Opportunistically predict BLR destinations using RET.
When executing a BL-type instruction, push the new LR onto the stack,
then CALL the dispatcher or linked block rather than JMPing to it.  When
executing BLR, compare [rsp+8] to LR, and RET if it's right, which it
usually will be unless the thread was switched out.  If it's not right,
reset RSP to avoid overflow.

This both saves a trip through the dispatcher and improves branch
prediction.

There is a small possibility of stack overflow anyway, which should
be handled... *yawn*
2014-09-17 19:56:09 -04:00
..
2014-09-15 15:07:33 -07:00
2014-09-15 15:06:05 -07:00