[llvm-commits] [llvm] r109449 - /llvm/trunk/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp

[Eric Christopher]

On Jul 26, 2010, at 2:49 PM, Evan Cheng wrote:

> The "excess register pressure" returned by HighRegPressure() is not accurate enough to factor into scheduling priority. Eliminate it and add early exits to speed up scheduling.

Excess was "number of registers used over the number in the class"?  If so it would probably only be useful when trying to schedule for conservation of registers, or to get registers back to where we can start scheduling for ILP again.

Why wasn't it accurate?  Cost problems or...?

-eric