[U-Boot] [PATCH 1/2] armv8: apply -mgeneral-regs-only

Tue Jul 4 16:38:10 UTC 2017

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

Regards,
Philipp.

> On 04 Jul 2017, at 15:32, Tom Rini <trini at 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.fan at nxp.com>
>> Cc: Albert Aribaud <albert.u.boot at aribaud.net>
>> Cc: Tom Rini <trini at konsulko.com>
> 
> Reviewed-by: Tom Rini <trini at konsulko.com>
> 
> -- 
> Tom
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