> -----Original Message----- > From: Tom Rini [mailto:tr...@konsulko.com] > Sent: Wednesday, July 05, 2017 3:38 AM > To: Dr. Philipp Tomsich <philipp.toms...@theobroma-systems.com> > Cc: Peng Fan <peng....@nxp.com>; u-boot@lists.denx.de > Subject: Re: [U-Boot] [PATCH 1/2] armv8: apply -mgeneral-regs-only > > On Tue, Jul 04, 2017 at 06:38:10PM +0200, Dr. Philipp Tomsich wrote: > > Tom, > > > > Please note that some GCC versions had a code-generation bug when > > -mgeneral-regs-only was used (we hit this for a customer in a vendor > > GCC we maintain): > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64304 > > > > Until everyone upgrades to a recently recent GCC (or until UBoot > > enforces this next January), some people may hit hard-to-reproduce > > issues. > > > > A better way to suppress SIMD generation would be to use: > > -march=armv8-a+nosimd > > Ah, good to know. Peng, please re-spin.
According to https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html, There is no +nosimd for armv8-a. I also tried +nosimd, There is still "str q0, [x29,#112] ". If I use armv8-a+nofp, there is no such instructions. Then, do you agree using " armv8-a+nofp "? Thanks, Peng. > > > > > Regards, > > Philipp. > > > > > On 04 Jul 2017, at 15:32, Tom Rini <tr...@konsulko.com> wrote: > > > > > > On Mon, Jul 03, 2017 at 09:14:07PM +0800, Peng Fan wrote: > > > > > >> Pass -mgeneral-regs-only to GCC, if not compiler may generate > > >> instructions that use SIMD registers. > > >> > > >> Signed-off-by: Peng Fan <peng....@nxp.com> > > >> Cc: Albert Aribaud <albert.u.b...@aribaud.net> > > >> Cc: Tom Rini <tr...@konsulko.com> > > > > > > Reviewed-by: Tom Rini <tr...@konsulko.com> > > > > > > -- > > > Tom > > > _______________________________________________ > > > U-Boot mailing list > > > U-Boot@lists.denx.de > > > https://lists.denx.de/listinfo/u-boot > > > > -- > Tom _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
