[PATCH] x86: Avoid vector/r16-r31 registers and memcpy/memset in mcount_internal

[Andreas K. Huettel]

OK with review, thanks.

The impact of -mgeneral-regs-only -mno-apxf is kind of obvious.

Does -fno-tree-loop-distribute-patterns also impact the register selection or is this
a subsequent higher level optimization?


Am Dienstag, 8. Juli 2025, 02:08:54 Mitteleuropäische Sommerzeit schrieb H.J. Lu:
> Since mcount_internal is called from mcount/__fentry__ which preserve
> only RAX, RCX, RDX, RSI, RDI, R8 and R9, compile mcount.c with
> 
> -fno-tree-loop-distribute-patterns -mgeneral-regs-only -mno-apxf
> 
> to void vector/r16-r31 registers and memcpy/memset in mcount_internal.
> This fixes BZ #33134.
> 
> 
> 


-- 
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)
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