RFC: [PATCH] x86: Add -mzero-caller-saved-regs=[skip|used|all]

[Rich Felker]

On Wed, Sep 26, 2018 at 11:10:29AM -0700, H.J. Lu wrote:
> Add -mzero-caller-saved-regs=[skip|used|all] command-line option and
> zero_caller_saved_regs("skip|used|all") function attribue:

Minor nit, but could this be named -mzero-call-clobbered-regs?
"Caller-saved" is a misnomer and inconsistent with other gcc usage.
For example -fcall-used-[reg] documents it as "an allocable register
that is clobbered by function calls". This is a piece of terminology
I've been trying to get fixed in educational materials so it would be
nice to avoid a new instance of it in gcc.

Rich