Re: [RFC PATCH 00/29] arm64: Scalable Vector Extension core support

Dave Martin <[email protected]> Thu, 1 Dec 2016 12:19:21 +0000

Newsgroups	gmane.linux.ports.arm.kernel,gmane.comp.lib.glibc.alpha,gmane.comp.gdb.devel
Message-ID	<[email protected]>

On Thu, Dec 01, 2016 at 10:30:51AM +0000, Dave Martin wrote:

[...]

> Basically, all the *new* state is caller-save.
> 
> The Neon/FPSIMD regs V8-V15 are callee-save, so in the SVE view
> Zn[bits 127:0] is callee-save for all n = 8..15.

Ramana is right -- the current procedure call standard (ARM IHI 0055B)
only requires the bottom _64_ bits of V8-V15 to be preserved (not all
128 bits as I stated).

[...]

Cheers
---Dave