[libav-devel] [PATCH] hevcdsp: add x86 SIMD for MC

Henrik Gramner henrik at gramner.com
Sun Aug 23 21:11:46 CEST 2015


On Sun, Aug 23, 2015 at 8:27 PM, Anton Khirnov <anton at khirnov.net> wrote:
> Quoting James Almer (2015-08-22 23:58:41)
>> You need to use the d suffix
>> instead of q on the register names to make sure the high bits are cleared.
>
> Eh? Perhaps I'm misunderstading something, but I'd expect that using d
> here would do exactly the opposite and keep the random data in the high bits.

Operations on 32-bit registers zeroes the high bits of the register.


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