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Subject: [Bug target/100152] [10 Regression] used caller-saved register not
 preserved across a call.
Date: Sun, 29 May 2022 19:13:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100152

--- Comment #59 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Iain D Sandoe
<iains@gcc.gnu.org>:

https://gcc.gnu.org/g:b6a762bf4645d495ea2218dbabcebd0c15eb60fc

commit r10-10797-gb6a762bf4645d495ea2218dbabcebd0c15eb60fc
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Mon May 3 08:22:53 2021 +0100

    Darwin, X86: Adjust call clobbers to allow for lazy-binding [PR 100152].

    We allow public functions defined in a TU to bind locally for PIC
    code (the default) on 64bit Mach-O.

    If such functions are not inlined, we cannot tell at compile-time if
    they might be called via the lazy symbol resolver (this can depend on
    options given at link-time).  Therefore, we must assume that the lazy
    resolver could be used which clobbers R11 and R10.

    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

    gcc/ChangeLog:

            PR target/100152
            * config/i386/i386-expand.c (ix86_expand_call): If a call is
            to a non-local-binding, or local but to a public symbol, then
            assume that it might be indirected via the lazy symbol binder.
            Mark R10 and R10 as clobbered in that case.

    (cherry picked from commit 41bd1b190358fce213f5add8396faf14a32d5c23)=