Vectors are passed in memory and returned in memory. Vectors are arbitrary length, whereas the vector registers are fixed length, and can only be used to temporarily hold a portion of a memory vector. Thus it doesn’t make sense to pass or return things in vector registers, or to have the registers saved or restored as part of the calling convention.
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On Dec 25, 2019, at 20:17, "戎杰杰 <jiejie.rjj@...> wrote:
Thanks for your mention.
It’s so clear & simple, there is no convention for vector args & return of function ?
also, according our long time designed cpu experiments, there should be some
callee saved vector registers for performance across some complicated function calls, right ? :)
Any considers or details for excluding like vector args ?
在 2019年12月24日 +0800 AM4:46，Andrew Waterman <andrew@...>，写道：
There is a brief sketch of the Linux vector calling convention here:
Note this is the convention for normal C ABI calls; a separate convention will be adopted for vector millicode calls.
On Mon, Dec 23, 2019 at 2:12 PM "戎杰杰 <jiejie.rjj@...> wrote:
Anyone know extra designed ABI information (like Calling Convention)
about for vector register ?