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vec_mradds -> _mm_maddubs_epi16 ???
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vec_mradds -> _mm_maddubs_epi16 ???

Hi

I'm translating some code I wrote 3 years ago, scratching my head because it is my first week in SSE.

RGB to YUV conversion that  and now needs to convert it to SSE code

//	Y  = ( 8414 R + 16519 G +  3208 B)/32768 + 16
//	Cb = (-4857 R -  9535 G + 14392 B)/32768 + 128
//	Cr = (14392 R - 12052 G -  2341 B)/32768 + 128

//	Convert the first three input vectors.  Note that
//  only the top 16 bits of the 32 bit product are
//	stored.  This is the same as doing the divide by 32768.

v07_signed_short = vec_mradds( v04_signed_short, v12_Const_8414, (vSInt16)v12_Const_0 ); // (R0 .. R7) * 8414
v08_signed_short = vec_mradds( v04_signed_short, v12_Const_NEG_4857, (vSInt16)v12_Const_0 ); // (R0 .. R7) * -4857
v09_signed_short = vec_mradds( v04_signed_short, v12_Const_14392, (vSInt16)v12_Const_0 ); // (R0 .. R7) * 14392

v07_signed_short = vec_mradds( v05_signed_short, v12_Const_16519, v07_signed_short ); // += (G0 .. G7) * 16519
v08_signed_short = vec_mradds( v05_signed_short, v12_Const_NEG_9535, v08_signed_short ); // += (G0 .. G7) * -9535
v09_signed_short = vec_mradds( v05_signed_short, v12_Const_NEG_12052, v09_signed_short ); // += (G0 .. G7) * -12052

v07_signed_short = vec_mradds( v06_signed_short, v12_Const_3208, v07_signed_short ); // Y+= (B0 .. B7) * 3208
v08_signed_short = vec_mradds( v06_signed_short, v12_Const_14392, v08_signed_short ); // Cb += (B0 .. B7) * 14392
v09_signed_short = vec_mradds( v06_signed_short, v12_Const_NEG_2341, v09_signed_short ); // Cr+= (B0 .. B7) * -2341


I was wondering if vec_mradds can be translated to the SSE3 _mm_maddubs_epi16
I SSE3 is core 2 duo and XEON 5100 which is fine for me.

or has anyone suggestions how I can translate above code?

regards,

marc
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