[llvm-commits] [RFC] Add support of RTM from TSX

[Michael Liao]

Hi

Here's the patch adding RTM support from TSX[1] available in Haswell[2].
This patch adds 3 intrinsics of RTM, namely xbegin, xend, and xabort,
which could be used to add hardware support for the draft C++
transaction language constructs.

Thanks for your review.
- Michael

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[1] http://software.intel.com/sites/default/files/319433-014.pdf
[2]
http://software.intel.com/en-us/blogs/2012/02/07/transactional-synchronization-in-haswell
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