Future-proof the ARM64 ABI by not reserving the entire top byte. #21015
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Targets that want to use armv8.5a memory tagging will need this. Hopefully nobody comes up with a brilliant reason they need to use anything else.
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@swift-ci Please test. |
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Targets that want to use armv8.5a memory tagging will need this. Hopefully nobody comes up with a brilliant reason they need to use anything else.
This is ABI-affecting but is unlikely to cause serious convergence problems because it only affects a small set of code-emission situations.
rdar://46465903