[U-Boot] How to use the NEON instruction at u-boot?

[Kyungmin Park]

2010/11/11 Måns Rullgård <mans at mansr.com>:
> Kyungmin Park <kmpark at infradead.org> writes:
>
>> Hi,
>>
>> Now I'm trying to use the NEON instruction at u-boot. but it's failed
>> and got the data abort.
>> Are there any way to use the NEON instruction at u-boot?
>
> No, just like you can't use floating-point.

I don't use the floating-point just use the 64 or 128 registers for memcpy.
>
>> The main purpose is to use the neon memcpy as below.
>>
>>         bge         1f
>>         // copies 4 bytes, destination 32-bits aligned
>>         vld4.8      {d0[0], d1[0], d2[0], d3[0]}, [r1]!
>>         vst4.8      {d0[0], d1[0], d2[0], d3[0]}, [r0, :32]!
>> 1:      bcc         2f
>
> Plain LDR/STR will be just as fast as that.

I saw you patches and the result using neon is better than ARM optimized memcpy.
Now I used the ARM optimized memcpy. and try to find a better solution as NEON.

Thank you,
Kyungmin Park
>
> --
> Måns Rullgård
> mans at mansr.com
>
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