QingShan Zhang f8eabd6d01 [Power9] Add addi post-ra scheduling heuristic ...

The instruction addi is usually used to post increase the loop indvar, which looks like this:

label_X:
 load x, base(i)
 ...
 y = op x
 ...
 i = addi i, 1
 goto label_X

However, for PowerPC, if there are too many vsx instructions that between y = op x and  i = addi i, 1,
it will use all the hw resource that block the execution of i = addi, i, 1, which result in the stall
of the load instruction in next iteration. So, a heuristic is added to move the addi as early as possible
to have the load hide the latency of vsx instructions, if other heuristic didn't apply to avoid the starve.

Reviewed By: jji

Differential Revision: https://reviews.llvm.org/D80269

2020-06-08 01:31:07 +00:00

1.8 KiB

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