Robin Morisset 58bca6e8ec [Power] Use AtomicExpandPass for fence insertion, and use lwsync where appropriate ...

Summary:
This patch makes use of AtomicExpandPass in Power for inserting fences around
atomic as part of an effort to remove fence insertion from SelectionDAGBuilder.
As a big bonus, it lets us use sync 1 (lightweight sync, often used by the mnemonic
lwsync) instead of sync 0 (heavyweight sync) in many cases.

I also added a test, as there was no test for the barriers emitted by the Power
backend for atomic loads and stores.

Test Plan: new test + make check-all

Reviewers: jfb

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5180

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218331 91177308-0d34-0410-b5e6-96231b3b80d8

2014-09-23 20:46:49 +00:00

..

llvm

[Power] Use AtomicExpandPass for fence insertion, and use lwsync where appropriate

2014-09-23 20:46:49 +00:00

llvm-c

[C API] Make the 'lower switch' pass available via the C API.

2014-09-11 21:32:32 +00:00