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ffmpeg/libavcodec/bfin/idct_bfin.S
Marc Hoffman 67fd620c01 bfin dsputils, basic pixel operations sads, diffs, motion compensation 
and standard IEEE 8x8 block transforms
patch by Marc Hoffman, mmh pleasantst com

Originally committed as revision 8594 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007-04-01 22:28:45 +00:00

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/*
* idct BlackFin
*
* Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
This blackfin DSP code implements an 8x8 inverse type II DCT.
Prototype : void ff_bfin_idct(DCTELEM *in)
Registers Used : A0, A1, R0-R7, I0-I3, B0, B2, B3, M0-M2, L0-L3, P0-P5, LC0.
Performance :
Code Size : 498 Bytes.
Cycle Count : 417 Cycles
-----------------------------------------------------------
FFMPEG conformance testing results
-----------------------------------------------------------
dct-test: modified with the following
dct_error("BFINidct", 1, ff_bfin_idct, idct, test);
produces the following output
root:/u/ffmpeg/bhead/libavcodec> ./dct-test -i
ffmpeg DCT/IDCT test
8 15 -2 21 24 17 0 10
2 -10 -5 -5 -3 7 -14 -3
2 -13 -10 -19 18 -6 6 -2
9 4 16 -3 9 12 10 15
15 -9 -2 10 1 16 0 -15
-15 5 7 3 13 0 13 20
-6 -15 24 9 -18 1 9 -22
-8 25 23 2 -7 0 30 13
IDCT BFINidct: err_inf=1 err2=0.01002344 syserr=0.00150000 maxout=266 blockSumErr=64
IDCT BFINidct: 88.3 kdct/s
*/
#include "config_bfin.h"
.section .l1.data.B,"aw",@progbits
.align 4;
coefs:
.short 0x5a82; // C4
.short 0x5a82; // C4
.short 0x30FC; //cos(3pi/8) C6
.short 0x7642; //cos(pi/8) C2
.short 0x18F9; //cos(7pi/16)
.short 0x7D8A; //cos(pi/16)
.short 0x471D; //cos(5pi/16)
.short 0x6A6E; //cos(3pi/16)
.short 0x18F9; //cos(7pi/16)
.short 0x7D8A; //cos(pi/16)
.section .l1.data.A
vtmp: .space 256
#define TMP0 FP-8
#define TMP1 FP-12
#define TMP2 FP-16
DEFUN(idct,mL1,
(DCTELEM *block)):
/********************** Function Prologue *********************************/
link 16;
[--SP] = (R7:4, P5:3); // Push the registers onto the stack.
B0 = R0; // Pointer to Input matrix
R1 = [P3+coefs@GOT17M4]; // Pointer to Coefficients
R2 = [P3+vtmp@GOT17M4]; // Pointer to Temporary matrix
B3 = R1;
B2 = R2;
L3 = 20; // L3 is used for making the coefficient array
// circular.
// MUST BE RESTORED TO ZERO at function exit.
M1 = 16 (X); // All these registers are initialized for
M3 = 8(X); // modifying address offsets.
I0 = B0; // I0 points to Input Element (0, 0).
I2 = B0; // I2 points to Input Element (0, 0).
I2 += M3 || R0.H = W[I0];
// Element 0 is read into R0.H
I1 = I2; // I1 points to input Element (0, 6).
I1 += 4 || R0.L = W[I2++];
// I2 points to input Element (0, 4).
// Element 4 is read into R0.L.
P2 = 8 (X);
P3 = 32 (X);
P4 = -32 (X);
P5 = 98 (X);
R7 = 0x8000(Z);
I3 = B3; // I3 points to Coefficients
P0 = B2; // P0 points to array Element (0, 0) of temp
P1 = B2;
R7 = [I3++] || [TMP2]=R7; // Coefficient C4 is read into R7.H and R7.L.
MNOP;
NOP;
/*
* A1 = Y0 * cos(pi/4)
* A0 = Y0 * cos(pi/4)
* A1 = A1 + Y4 * cos(pi/4)
* A0 = A0 - Y4 * cos(pi/4)
* load:
* R1=(Y2,Y6)
* R7=(C2,C6)
* res:
* R3=Y0, R2=Y4
*/
A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || I0+= 4 || R1.L=W[I1++];
R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || R1.H=W[I0--] || R7=[I3++];
LSETUP (.0, .1) LC0 = P2; // perform 8 1d idcts
P2 = 112 (X);
P1 = P1 + P2; // P1 points to element (7, 0) of temp buffer.
P2 = -94(X);
.0:
/*
* A1 = Y2 * cos(3pi/8)
* A0 = Y2 * cos(pi/8)
* A1 = A1 - Y6 * cos(pi/8)
* A0 = A0 + Y6 * cos(3pi/8)
* R5 = (Y1,Y7)
* R7 = (C1,C7)
* res:
* R1=Y2, R0=Y6
*/
A1=R7.L*R1.H, A0=R7.H*R1.H (IS) || I0+=4 || R5.H=W[I0];
R1=(A1-=R7.H*R1.L), R0=(A0+=R7.L*R1.L) (IS) || R5.L=W[I1--] || R7=[I3++];
/*
* Y0 = Y0 + Y6.
* Y4 = Y4 + Y2.
* Y2 = Y4 - Y2.
* Y6 = Y0 - Y6.
* R3 is saved
* R6.l=Y3
* note: R3: Y0, R2: Y4, R1: Y2, R0: Y6
*/
R3=R3+R0, R0=R3-R0;
R2=R2+R1, R1=R2-R1 || [TMP0]=R3 || R6.L=W[I0--];
/*
* Compute the odd portion (1,3,5,7) even is done.
*
* Y1 = C7 * Y1 - C1 * Y7 + C3 * Y5 - C5 * Y3.
* Y7 = C1 * Y1 + C7 * Y7 + C5 * Y5 + C3 * Y3.
* Y5 = C5 * Y1 + C3 * Y7 + C7 * Y5 - C1 * Y3.
* Y3 = C3 * Y1 - C5 * Y7 - C1 * Y5 - C7 * Y3.
*/
// R5=(Y1,Y7) R6=(Y5,Y3) // R7=(C1,C7)
A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || [TMP1]=R2 || R6.H=W[I2--];
A1-=R7.H*R5.L, A0+=R7.L*R5.L (IS) || I0-=4 || R7=[I3++];
A1+=R7.H*R6.H, A0+=R7.L*R6.H (IS) || I0+=M1; // R7=(C3,C5)
R3 =(A1-=R7.L*R6.L), R2 =(A0+=R7.H*R6.L) (IS);
A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || R4=[TMP0];
A1+=R7.H*R5.L, A0-=R7.L*R5.L (IS) || I1+=M1 || R7=[I3++]; // R7=(C1,C7)
A1+=R7.L*R6.H, A0-=R7.H*R6.H (IS);
R7 =(A1-=R7.H*R6.L), R6 =(A0-=R7.L*R6.L) (IS) || I2+=M1;
// R3=Y1, R2=Y7, R7=Y5, R6=Y3
/* Transpose write column. */
R5.H=R4+R2 (RND12); // Y0=Y0+Y7
R5.L=R4-R2 (RND12) || R4 = [TMP1]; // Y7=Y7-Y0
R2.H=R1+R7 (RND12) || W[P0++P3]=R5.H; // Y2=Y2+Y5 st Y0
R2.L=R1-R7 (RND12) || W[P1++P4]=R5.L || R7=[I3++]; // Y5=Y2-Y5 st Y7
R5.H=R0-R3 (RND12) || W[P0++P3]=R2.H || R1.L=W[I1++]; // Y1=Y6-Y1 st Y2
R5.L=R0+R3 (RND12) || W[P1++P4]=R2.L || R0.H=W[I0++]; // Y6=Y6+Y1 st Y5
R3.H=R4-R6 (RND12) || W[P0++P3]=R5.H || R0.L=W[I2++]; // Y3=Y3-Y4 st Y1
R3.L=R4+R6 (RND12) || W[P1++P4]=R5.L || R1.H=W[I0++]; // Y4=Y3+Y4 st Y6
/* pipeline loop start, + drain Y3, Y4 */
A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || W[P0++P2]= R3.H || R1.H = W[I0--];
.1: R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || W[P1++P5]= R3.L || R7 = [I3++];
I0 = B2; // I0 points to Input Element (0, 0)
I2 = B2; // I2 points to Input Element (0, 0)
I2 += M3 || R0.H = W[I0];
// Y0 is read in R0.H
I1 = I2; // I1 points to input Element (0, 6)
I1 += 4 || R0.L = W[I2++];
// I2 points to input Element (0, 4)
// Y4 is read in R0.L
P2 = 8 (X);
I3 = B3; // I3 points to Coefficients
P0 = B0; // P0 points to array Element (0, 0) for writing
// output
P1 = B0;
R7 = [I3++]; // R7.H = C4 and R7.L = C4
NOP;
/*
* A1 = Y0 * cos(pi/4)
* A0 = Y0 * cos(pi/4)
* A1 = A1 + Y4 * cos(pi/4)
* A0 = A0 - Y4 * cos(pi/4)
* load:
* R1=(Y2,Y6)
* R7=(C2,C6)
* res:
* R3=Y0, R2=Y4
*/
A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || I0+=4 || R1.L=W[I1++];
R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || R1.H=W[I0--] || R7=[I3++];
LSETUP (.2, .3) LC0 = P2; // peform 8 1d idcts
P2 = 112 (X);
P1 = P1 + P2;
P2 = -94(X);
.2:
/*
* A1 = Y2 * cos(3pi/8)
* A0 = Y2 * cos(pi/8)
* A1 = A1 - Y6 * cos(pi/8)
* A0 = A0 + Y6 * cos(3pi/8)
* R5 = (Y1,Y7)
* R7 = (C1,C7)
* res:
* R1=Y2, R0=Y6
*/
A1=R7.L*R1.H, A0=R7.H*R1.H (IS) || I0+=4 || R5.H=W[I0];
R1=(A1-=R7.H*R1.L), R0=(A0+=R7.L*R1.L) (IS) || R5.L=W[I1--] || R7=[I3++];
/*
* Y0 = Y0 + Y6.
* Y4 = Y4 + Y2.
* Y2 = Y4 - Y2.
* Y6 = Y0 - Y6.
* R3 is saved
* R6.l=Y3
* note: R3: Y0, R2: Y4, R1: Y2, R0: Y6
*/
R3=R3+R0, R0=R3-R0;
R2=R2+R1, R1=R2-R1 || [TMP0]=R3 || R6.L=W[I0--];
/*
* Compute the odd portion (1,3,5,7) even is done.
*
* Y1 = C7 * Y1 - C1 * Y7 + C3 * Y5 - C5 * Y3.
* Y7 = C1 * Y1 + C7 * Y7 + C5 * Y5 + C3 * Y3.
* Y5 = C5 * Y1 + C3 * Y7 + C7 * Y5 - C1 * Y3.
* Y3 = C3 * Y1 - C5 * Y7 - C1 * Y5 - C7 * Y3.
*/
// R5=(Y1,Y7) R6=(Y5,Y3) // R7=(C1,C7)
A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || [TMP1]=R2 || R6.H=W[I2--];
A1-=R7.H*R5.L, A0+=R7.L*R5.L (IS) || I0-=4 || R7=[I3++];
A1+=R7.H*R6.H, A0+=R7.L*R6.H (IS) || I0+=M1; // R7=(C3,C5)
R3 =(A1-=R7.L*R6.L), R2 =(A0+=R7.H*R6.L) (IS);
A1 =R7.L*R5.H, A0 =R7.H*R5.H (IS) || R4=[TMP0];
A1+=R7.H*R5.L, A0-=R7.L*R5.L (IS) || I1+=M1 || R7=[I3++]; // R7=(C1,C7)
A1+=R7.L*R6.H, A0-=R7.H*R6.H (IS);
R7 =(A1-=R7.H*R6.L), R6 =(A0-=R7.L*R6.L) (IS) || I2+=M1;
// R3=Y1, R2=Y7, R7=Y5, R6=Y3
/* Transpose write column. */
R5.H=R4+R2 (RND20); // Y0=Y0+Y7
R5.L=R4-R2 (RND20) || R4 = [TMP1]; // Y7=Y7-Y0
R2.H=R1+R7 (RND20) || W[P0++P3]=R5.H; // Y2=Y2+Y5 st Y0
R2.L=R1-R7 (RND20) || W[P1++P4]=R5.L || R7=[I3++]; // Y5=Y2-Y5 st Y7
R5.H=R0-R3 (RND20) || W[P0++P3]=R2.H || R1.L=W[I1++]; // Y1=Y6-Y1 st Y2
R5.L=R0+R3 (RND20) || W[P1++P4]=R2.L || R0.H=W[I0++]; // Y6=Y6+Y1 st Y5
R3.H=R4-R6 (RND20) || W[P0++P3]=R5.H || R0.L=W[I2++]; // Y3=Y3-Y4 st Y1
R3.L=R4+R6 (RND20) || W[P1++P4]=R5.L || R1.H=W[I0++]; // Y4=Y3+Y4 st Y6
/* pipeline loop start, + drain Y3, Y4 */
A1=R7.H*R0.H, A0=R7.H*R0.H (IS) || W[P0++P2]= R3.H || R1.H = W[I0--];
.3: R3=(A1+=R7.H*R0.L), R2=(A0-=R7.H*R0.L) (IS) || W[P1++P5]= R3.L || R7 = [I3++];
L3 = 0;
(R7:4,P5:3)=[SP++];
unlink;
RTS;
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