<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><DIV>Hello Matt,</DIV>
<DIV> </DIV>
<DIV>Could you tell me how to reproduce the hash mistake?<BR>I check the code again, the intra_pred_allangs() called only Luma path.</DIV><PRE>Thanks,</PRE><PRE>Min</PRE><PRE>At 2013-12-22 08:35:09,"Matt Johnson" <johnso87@illinois.edu> wrote:
>Hi all,
> I don't know x86 assembly well enough to easily diagnose the problem
>myself, but I'm running into a problem with intra prediction in the
>horizontal (mode 10) and vertical (mode 26) modes, where the SSE4 result
>(--cpuid 255) mismatches the C result (--cpuid 1) and indeed any cpuid
>value earlier than SSE4.
> The problem seems to be with the filtering clause (Equation 8-54 in the
>standard for mode 26, 8-62 for mode 10), which applies to 4x4, 8x8, and
>16x16 luma blocks. I'm seeing the problem with 4x4 chroma blocks; it
>looks like the C version respects the bLuma flag to all_angs_pred_c()
>(which propagates to the bFilter argument to intra_pred_ang_c()), so the
>filtering clause is not invoked for 4x4 chroma blocks and the normal
>equations involving ref[], iIdx, and iFact come into play. It looks
>like the SSE4 version doesn't implement that flag the same way; the
>predicted pixels I'm getting back are consistent with the use of the
>filtering clause.
>
>Thanks,
>Matt
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</PRE></div>