SSE_ALL-Miscellaneous-MMX

SSE_ALL-Miscellaneous-MMX#

_m_psadbw#

Tech:

SSE_ALL

Category:

Miscellaneous

Header:

xmmintrin.h

Searchable:

SSE_ALL-Miscellaneous-MMX

Register:

MMX 64 bit

Return Type:

__m64

Param Types:

__m64 a, __m64 b

Param ETypes:

UI8 a, UI8 b

__m64 _m_psadbw(__m64 a, __m64 b);

Intel Description

Compute the absolute differences of packed unsigned 8-bit integers in “a” and “b”, then horizontally sum each consecutive 8 differences to produce four unsigned 16-bit integers, and pack these unsigned 16-bit integers in the low 16 bits of “dst”.

Intel Implementation Psudeo-Code

FOR j := 0 to 7
        i := j*8
        tmp[i+7:i] := ABS(a[i+7:i] - b[i+7:i])
ENDFOR
dst[15:0] := tmp[7:0] + tmp[15:8] + tmp[23:16] + tmp[31:24] + tmp[39:32] + tmp[47:40] + tmp[55:48] + tmp[63:56]
dst[63:16] := 0

_m_pmovmskb#

Tech:

SSE_ALL

Category:

Miscellaneous

Header:

xmmintrin.h

Searchable:

SSE_ALL-Miscellaneous-MMX

Register:

MMX 64 bit

Return Type:

int

Param Types:

__m64 a

Param ETypes:

UI8 a

int _m_pmovmskb(__m64 a);

Intel Description

Create mask from the most significant bit of each 8-bit element in “a”, and store the result in “dst”.

Intel Implementation Psudeo-Code

FOR j := 0 to 7
        i := j*8
        dst[j] := a[i+7]
ENDFOR
dst[MAX:8] := 0
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