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7196a8ff21
Prioritize the instruction that comes closest to keeping pressure under the target's limit. Then prioritize instructions that avoid increasing the max pressure in the scheduled region. The max pressure heuristic is a tad aggressive. Later I'll fix it to consider the unscheduled pressure as well. WIP: This is mostly functional but untested and not likely to do much good yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156574 91177308-0d34-0410-b5e6-96231b3b80d8
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