s390x: Add support for atomic operations (part 1) #2988
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This adds full back-end support for the Fence, AtomicLoad and AtomicStore operations, and partial support for the AtomicCas and AtomicRmw operations. The missing pieces include sub-word operations, operations on little-endian memory requiring byte-swapping, and some of the subtypes of AtomicRmw -- everything that cannot be implemented without a compare-and-swap loop. This will be done in a follow-up patch. This patch already suffices to make the test suite green again after a recent change that now requires atomic operations when accessing the heap.
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FYI @cfallin - as discussed in our call yesterday. |
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This adds full back-end support for the Fence, AtomicLoad
and AtomicStore operations, and partial support for the
AtomicCas and AtomicRmw operations.
The missing pieces include sub-word operations, operations
on little-endian memory requiring byte-swapping, and some
of the subtypes of AtomicRmw -- everything that cannot be
implemented without a compare-and-swap loop. This will be
done in a follow-up patch.
This patch already suffices to make the test suite green
again after a recent change that now requires atomic
operations when accessing the heap.