Messages in this thread | | | Date | Sat, 25 Apr 2015 19:26:13 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH] Use -mskip-rax-setup if supported |
| |
On Thu, Apr 16, 2015 at 02:23:44PM -0700, H.J. Lu wrote: > GCC 5 added a compiler option, -mskip-rax-setup, for x86-64. It skips > setting up the RAX register when SSE is disabled and there are no > variable arguments passed in vector registers. Since kernel doesn't > pass vector registers to functions with variable arguments, this option > can be used to optimize the x86-64 kernel. For kernel 3.17: > > text data bss dec hex filename > 11455921 2204048 5853184 19513153 129bf41 vmlinux #with -mskip-rax-setup > 11480079 2204048 5853184 19537311 12a1d9f vmlinux > > > -- > H.J.
> From a759c1a4f6ffa408d49e1959449d6797769b951e Mon Sep 17 00:00:00 2001 > From: "H.J. Lu" <hjl.tools@gmail.com> > Date: Wed, 17 Dec 2014 18:05:29 -0800 > Subject: [PATCH] Use -mskip-rax-setup if supported > > GCC 5 added a compiler option, -mskip-rax-setup, for x86-64. It skips > setting up the RAX register when SSE is disabled and there are no > variable arguments passed in vector registers. Since kernel doesn't > pass vector registers to functions with variable arguments, this option > can be used to optimize the x86-64 kernel. For kernel 3.17: > > text data bss dec hex filename > 11455921 2204048 5853184 19513153 129bf41 vmlinux #with -mskip-rax-setup > 11480079 2204048 5853184 19537311 12a1d9f vmlinux > > Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Applied, thanks.
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
| |