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[PowerPC] Better scheduling for isel on P7/P8

Description

[PowerPC] Better scheduling for isel on P7/P8

isel is actually a cracked instruction on the P7/P8, and must start a dispatch
group. The scheduling model should reflect this so that we don't bunch too many
of them together when possible.

Thanks to Bill Schmidt and Pat Haugen for helping to sort this out.

Details

Committed
hfinkelFeb 1 2015, 9:52 AM
Parents
rL227757: Include cstddef in EquivalenceClasses.h
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