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/*
* Interpolation kernel for chrominance 4x4 motion compensation
* Copyright © <2010>, Intel Corporation.
*
* This program is licensed under the terms and conditions of the
* Eclipse Public License (EPL), version 1.0. The full text of the EPL is at
* http://www.opensource.org/licenses/eclipse-1.0.php.
*
*/
// Kernel name: Interpolate_C_4x4_Func.asm
//
// Interpolation kernel for chrominance 4x4 motion compensation
//
// $Revision: 8 $
// $Date: 10/09/06 4:00p $
//
//#if !defined(__Interpolate_C_4x4_Func__) // Make sure this is only included once
//#define __Interpolate_C_4x4_Func__
INTERLABEL(Interpolate_C_4x4_Func):
// (8-xFrac) and (8-yFrac)
add (2) gW0<1>:w gMVX_FRACC<2;2,1>:w -0x08:w
// Compute the GRF address of the starting position of the reference area
mov (1) pREF0:w nOFFSET_REFC:w {NoDDClr}
mov (1) pREF1:uw nOFFSET_REFC+16:w {NoDDChk,NoDDClr}
mov (1) pRESULT:uw gpINTPC:uw {NoDDChk}
// gCOEFA = (8-xFrac)*(8-yFrac)
// gCOEFB = xFrac*(8-yFrac)
// gCOEFC = (8-xFrac)*yFrac
// gCOEFD = xFrac*yFrac
mul (1) gCOEFD:w gMVX_FRACC:w gMVY_FRACC:w {NoDDClr}
mul (1) gCOEFA:w -gW0:w -gW1:uw {NoDDClr,NoDDChk}
mul (1) gCOEFB:w gMVX_FRACC:w -gW1:uw {NoDDClr,NoDDChk}
mul (1) gCOEFC:w -gW0:w gMVY_FRACC:w {NoDDChk}
add (2) gW0<1>:uw pREF0<2;2,1>:uw 16:w
// (8-xFrac)*(8-yFrac)*A
// ---------------------
mul (16) acc0<1>:uw r[pREF0,0]<16;8,1>:ub gCOEFA:uw
mul (16) acc1<1>:uw r[pREF0,nGRFWIB]<16;8,1>:ub gCOEFA:uw
// xFrac*(8-yFrac)*B
// -------------------
mac (16) acc0<1>:uw r[pREF0,2]<16;8,1>:ub gCOEFB:uw
mac (16) acc1<1>:uw r[pREF0,nGRFWIB+2]<16;8,1>:ub gCOEFB:uw
// (8-xFrac)*yFrac*C
// -------------------
mov (2) pREF0<1>:uw gW0<2;2,1>:uw
mac (16) acc0<1>:uw r[pREF0,0]<8,1>:ub gCOEFC:uw
mac (16) acc1<1>:uw r[pREF0,nGRFWIB]<8,1>:ub gCOEFC:uw
// xFrac*yFrac*D
// -----------------
mac (16) r[pRESULT]<1>:uw r[pREF0,2]<8,1>:ub gCOEFD:uw
mac (16) r[pRESULT,GRFWIB]<1>:uw r[pREF0,nGRFWIB+2]<8,1>:ub gCOEFD:uw {SecHalf}
//#endif // !defined(__Interpolate_C_4x4_Func__)
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