[PATCH] D19401: MachineScheduler: Fully compare top/bottom candidates

[Matthias Braun via llvm-commits]

MatzeB added a comment.

I would like to move this patch forward. I analyze some of the AMDGPU regression and they are accidentally cause by shortcomings in the MachineScheduler ReadyCycle computation which calculates suboptimal values when an instruction requires 0 cycles. Fixing this properly is for another day, but the obvious fix for AMDGPU is not defining COPY as 0 cycles (which most likely was not intentional anyway). Tom or Matt could you take a look at: http://reviews.llvm.org/D21540?


Repository:
  rL LLVM

http://reviews.llvm.org/D19401