Runtime: Have native refcounting entry points ignore negative pointer values on x86-64 and arm64.#7732
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jckarter merged 1 commit intoswiftlang:masterfrom Feb 25, 2017
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@swift-ci Please test |
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And ObjC-style tagged pointers! |
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@swift-ci Please smoke test Linux |
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Don't merge this yet. It will clash with #5282. |
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… values on x86-64 and arm64. The high half of the address space is used by the kernel in these architectures, and it would be useful for us to be able to pack small values into places the ABI otherwise requires a refcountable pointer, such as closures and maybe refcounted existentials.
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The high half of the address space is used by the kernel in these architectures, and it would be useful for us to be able to pack small values into places the ABI otherwise requires a refcountable pointer, such as closures and maybe refcounted existentials.