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3e16b022be
We've been performing the wrong operation on ARM for "atomicrmw nand" for years, since "a NAND b" is "~(a & b)" rather than ARM's very tempting "a & ~b". This bled over into the generic expansion pass. So I assume no-one has ever actually tried to do an atomic nand in the real world. Oh well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212443 91177308-0d34-0410-b5e6-96231b3b80d8
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