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AArch64: use ldxp/stxp pair to implement 128-bit atomic loads.
authorTim Northover <tnorthover@apple.com>
Wed, 2 Dec 2015 18:12:57 +0000 (18:12 +0000)
committerTim Northover <tnorthover@apple.com>
Wed, 2 Dec 2015 18:12:57 +0000 (18:12 +0000)
The ARM ARM is clear that 128-bit loads are only guaranteed to have been atomic
if there has been a corresponding successful stxp. It's less clear for AArch32, so
I'm leaving that alone for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254524 91177308-0d34-0410-b5e6-96231b3b80d8


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