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| author | Tim Northover <tnorthover@apple.com> | 2013-07-01 14:48:48 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2013-07-01 14:48:48 +0000 |
| commit | d59fc0af0a3ebd13c7004511e64e3233dfe87b17 (patch) | |
| tree | 1cc4dbfa52c9735cb04654858ebc786c87a15509 /lib/IR/ConstantFold.h | |
| parent | 728af3d574895dd9e4bb5c418c7398297c4f39fe (diff) | |
| download | external_llvm-d59fc0af0a3ebd13c7004511e64e3233dfe87b17.zip external_llvm-d59fc0af0a3ebd13c7004511e64e3233dfe87b17.tar.gz external_llvm-d59fc0af0a3ebd13c7004511e64e3233dfe87b17.tar.bz2 | |
ARM: relax the atomic release barrier to "dmb ishst"
I believe the full "dmb ish" barrier is not required to guarantee release
semantics for atomic operations. The weaker "dmb ishst" prevents previous
operations being reordered with a store executed afterwards, which is enough.
A key point to note (fortunately already correct) is that this barrier alone is
*insufficient* for sequential consistency, no matter how liberally placed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185339 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/IR/ConstantFold.h')
0 files changed, 0 insertions, 0 deletions