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;/**
; *
; * File Name: omxVCM4P2_QuantInvInter_I_s.s
; * OpenMAX DL: v1.0.2
; * Revision: 12290
; * Date: Wednesday, April 9, 2008
; *
; * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
; *
; *
; *
; * Description:
; * Contains modules for inter reconstruction
; *
; *
; *
; *
; *
; * Function: omxVCM4P2_QuantInvInter_I
; *
; * Description:
; * Performs inverse quantization on intra/inter coded block.
; * This function supports bits_per_pixel = 8. Mismatch control
; * is performed for the first MPEG-4 mode inverse quantization method.
; * The output coefficients are clipped to the range: [-2048, 2047].
; * Mismatch control is performed for the first inverse quantization method.
; *
; * Remarks:
; *
; * Parameters:
; * [in] pSrcDst pointer to the input (quantized) intra/inter block. Must be 16-byte aligned.
; * [in] QP quantization parameter (quantiser_scale)
; * [in] videoComp (Intra version only.) Video component type of the
; * current block. Takes one of the following flags:
; * OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE,
; * OMX_VC_ALPHA.
; * [in] shortVideoHeader a flag indicating presence of short_video_header;
; * shortVideoHeader==1 selects linear intra DC mode,
; * and shortVideoHeader==0 selects nonlinear intra DC mode.
; * [out] pSrcDst pointer to the output (dequantized) intra/inter block. Must be 16-byte aligned.
; *
; * Return Value:
; * OMX_Sts_NoErr - no error
; * OMX_Sts_BadArgErr - bad arguments
; * - If pSrcDst is NULL or is not 16-byte aligned.
; * or
; * - If QP <= 0.
; * or
; * - videoComp is none of OMX_VC_LUMINANCE, OMX_VC_CHROMINANCE and OMX_VC_ALPHA.
; *
; */
INCLUDE omxtypes_s.h
INCLUDE armCOMM_s.h
M_VARIANTS CortexA8
IF CortexA8
;//Input Arguments
pSrcDst RN 0
QP RN 1
;//Local Variables
Count RN 3
doubleQP RN 4
Return RN 0
;// Neon registers
dQP10 DN D0.S32[0]
qQP1 QN Q0.S32
dQP1 DN D0.S16
dMinusQP1 DN D1.S16
dCoeff0 DN D2.S16
dCoeff1 DN D3.S16
qResult0 QN Q3.S32
dResult0 DN D7.S16
qSign0 QN Q3.S32
dSign0 DN D6.S16
qResult1 QN Q4.S32
dResult1 DN D8.S16
qSign1 QN Q4.S32
dSign1 DN D8.S16
d2QP0 DN D10.S32[0]
q2QP0 QN Q5.S32
d2QP DN D10.S16
dZero0 DN D11.S16
dZero1 DN D12.S16
dConst0 DN D13.S16
M_START omxVCM4P2_QuantInvInter_I,r4,d13
ADD doubleQP,QP,QP ;// doubleQP= 2*QP
VMOV d2QP0,doubleQP
VDUP q2QP0,d2QP0 ;// Move doubleQP in to a scalar
TST QP,#1
VLD1 {dCoeff0,dCoeff1},[pSrcDst] ;// Load first 8 values to Coeff0,Coeff1
SUBEQ QP,QP,#1
VMOV dQP10,QP ;// If QP is even then QP1=QP-1 else QP1=QP
MOV Count,#64
VDUP qQP1,dQP10 ;// Duplicate tempResult with QP1
VSHRN d2QP,q2QP0,#0
VEOR dConst0,dConst0,dConst0
VSHRN dQP1,qQP1,#0 ;// QP1 truncated to 16 bits
VSUB dMinusQP1,dConst0,dQP1 ;// dMinusQP1=-QP1
Loop
;//Performing Inverse Quantization
VCLT dSign0,dCoeff0, #0 ;// Compare Coefficient 0 against 0
VCLT dSign1,dCoeff1, #0 ;// Compare Coefficient 1 against 0
VCEQ dZero0,dCoeff0,#0 ;// Compare Coefficient 0 against zero
VBSL dSign0,dMinusQP1,dQP1 ;// dSign0 = -QP1 if Coeff0< 0 else QP1
VCEQ dZero1,dCoeff1,#0 ;// Compare Coefficient 1 against zero
VBSL dSign1,dMinusQP1,dQP1 ;// dSign1 = -QP1 if Coeff1< 0 else QP1
VMOVL qSign0,dSign0 ;// Sign extend qSign0 to 32 bits
VMOVL qSign1,dSign1
VMLAL qResult0,dCoeff0,d2QP ;// qResult0[i]= qCoeff0[i]+qCoeff0[i]*(-2) if Coeff <0
;// qResult0[i]= qCoeff0[i] if Coeff >=0
VMLAL qResult1,dCoeff1,d2QP ;// qResult1[i]= qCoeff1[i]+qCoeff1[i]*(-2) if Coeff <0
;// qResult1[i]= qCoeff1[i] if Coeff >=0
;// Clip Result to [-2048,2047]
VQSHL qResult0,qResult0,#20 ;// clip to [-2048,2047]
VQSHL qResult1,qResult1,#20
VSHR qResult0,qResult0,#4
VSHR qResult1,qResult1,#4
VSHRN dResult0,qResult0,#16 ;// Narrow the clipped Value to Halfword
VSHRN dResult1,qResult1,#16
VBIT dResult0,dConst0,dZero0
VBIT dResult1,dConst0,dZero1
VST1 {dResult0,dResult1},[pSrcDst]! ;// Store the result
SUBS Count,Count,#8
VLD1 {dCoeff0,dCoeff1},[pSrcDst]
BGT Loop
MOV Return,#OMX_Sts_NoErr
M_END
ENDIF
END
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