On 21 Aug 2016, at 02:25, Chris Lattner via swift-dev <[email protected]>
wrote:
> ARM64 even has a hardware feature for this, called “top byte ignored” (TBI)
> which means you don’t even have to do the masking.
Urgh, horrible flashbacks to the “32-bit clean” effort during the late 80s:
Currently the Macintosh OS runs in a 24-bit world, where the hardware
ignores
the high byte of all memory addresses (including pointers and handles).
-- Technote OV11 “The Joy Of Being 32-Bit Clean”
<https://developer.apple.com/legacy/library/technotes/ov/ov_11.html#//apple_ref/doc/uid/DTS10002609>
(-:
Share and Enjoy
--
Quinn "The Eskimo!" <http://www.apple.com/developer/>
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
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