Andrew Trick 73a0d8ecf8 misched: Added 3-level regpressure back-off. ...

Introduce the basic strategy for register pressure scheduling.

1) Respect target limits at all times.

2) Indentify critical register classes (pressure sets).
   Track pressure within the scheduled region.
   Avoid increasing scheduled pressure for critical registers.

3) Avoid exceeding the max pressure of the region prior to scheduling.

Added logic for picking between the top and bottom ready Q's based on
regpressure heuristics.

Status: functional but needs to be asjusted to achieve good results.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157006 91177308-0d34-0410-b5e6-96231b3b80d8

2012-05-17 18:35:10 +00:00

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