> On Dec 17, 2015, at 3:44 PM, Joe Groff via swift-dev <swift-dev@swift.org>
> wrote:
>
>
>> On Dec 17, 2015, at 3:43 PM, Greg Parker <gpar...@apple.com> wrote:
>>
>>
>>> On Dec 17, 2015, at 3:34 PM, Joe Groff via swift-dev <swift-dev@swift.org>
>>> wrote:
>>>
>>> On ARMv7 and ARM64, the argument and return register sets are the same
>>
>> Nit: True on arm64. Not true on armv7; the GPR parameters are r0-r3 but GPR
>> return is r0-r1.
>
> True, I meant that one sequence is a prefix of the other. If you pass the
> first argument in and return it out via {r0, r1} the operations could be done
> in-place.
Also, Swift functions can have their own ABIs. Extending the result registers
to use r0-r3 on ARM32 seems perfectly reasonable.
-Chris
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