Hal Finkel 626236d9bc [PowerPC] Modern Book-E cores support sync
Older Book-E cores, such as the PPC 440, support only msync (which has the same
encoding as sync 0), but not any of the other sync forms. Newer Book-E cores,
however, do support sync, and for performance reasons we should allow the use
of the more-general form.

This refactors msync use into its own feature group so that it applies by
default only to older Book-E cores (of the relevant cores, we only have
definitions for the PPC440/450 currently).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218923 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-02 22:34:22 +00:00
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