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/*
* Intra predict 8X8 luma block
* 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.
*
*/
#if !defined(__INTRA_PRED_8X8_Y__) // Make sure this is only included once
#define __INTRA_PRED_8X8_Y__
// Module name: intra_Pred_8X8_Y.asm
//
// Intra predict 8X8 luma block
//
//--------------------------------------------------------------------------
// Input data:
//
// REF_TOP: Top reference data stored in BYTE with p[-1,-1] at REF_TOP(0,-1), p[-1,-1] and [15,-1] adjusted
// REF_LEFT: Left reference data stored in BYTE with p[-1,0] at REF_LEFT(0,2), REF_LEFT(0,1) (p[-1,-1]) adjusted
// PRED_MODE: Intra prediction mode stored in 4 LSBs
// INTRA_PRED_AVAIL: Top/Left available flag, (Bit0: Left, Bit1: Top)
//
// Output data:
//
// REG_INTRA_8X8_PRED: Predicted 8X8 block data
//--------------------------------------------------------------------------
#define INTRA_REF REG_INTRA_TEMP_1
#define REF_TMP REG_INTRA_TEMP_2
intra_Pred_8x8_Y:
// Reference sample filtering
//
// Set up boundary pixels for unified filtering
mov (1) REF_TOP(0,16)<1> REF_TOP(0,15)REGION(1,0) // p[16,-1] = p[15,-1]
mov (8) REF_LEFT(0,2+8)<1> REF_LEFT(0,2+7)REGION(1,0) // p[-1,8] = p[-1,7]
// Top reference sample filtering (!!Consider instruction compression later)
add (16) acc0<1>:w REF_TOP(0,-1)REGION(16,1) 2:w // p[x-1,-1]+2
mac (16) acc0<1>:w REF_TOP(0)REGION(16,1) 2:w // p[x-1,-1]+2*p[x,-1]+2
mac (16) acc0<1>:w REF_TOP(0,1)REGION(16,1) 1:w // p[x-1,-1]+2*p[x,-1]+p[x+1,-1]+2
shr (16) REF_TMP<1>:w acc0:w 2:w // (p[x-1,-1]+2*p[x,-1]+p[x+1,-1]+2)>>2
// Left reference sample filtering
add (16) acc0<1>:w REF_LEFT(0)REGION(16,1) 2:w // p[-1,y-1]+2
mac (16) acc0<1>:w REF_LEFT(0,1)REGION(16,1) 2:w // p[-1,y-1]+2*p[-1,y]+2
mac (16) acc0<1>:w REF_LEFT(0,2)REGION(16,1) 1:w // p[-1,y-1]+2*p[-1,y]+p[-1,y+1]+2
shr (16) INTRA_REF<1>:w acc0:w 2:w // (p[-1,y-1]+2*p[-1,y]+p[-1,y+1]+2)>>2
// Re-assign filtered reference samples
mov (16) REF_TOP(0)<1> REF_TMP<32;16,2>:ub // p'[x,-1], x=0...15
mov (8) REF_LEFT(0)<1> INTRA_REF.2<16;8,2>:ub // p'[-1,y], y=0...7
mov (1) REF_TOP(0,-1)<1> INTRA_REF<0;1,0>:ub // p'[-1,-1]
// Select intra_8x8 prediction mode
//
and (1) PINTRAPRED_Y<1>:w PRED_MODE<0;1,0>:w 0x0F:w
// WA for "jmpi" restriction
mov (1) REG_INTRA_TEMP_1<1>:ud r[PINTRAPRED_Y, INTRA_8X8_OFFSET]:ub
jmpi (1) REG_INTRA_TEMP_1<0;1,0>:d
// Mode 0
#define PTMP a0.6
#define PTMP_D a0.3
INTRA_8X8_VERTICAL:
$for(0,0; <4; 1,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PERROR,%2]<16;16,1>:w REF_TOP(0)<0;8,1>
}
RETURN
// Mode 1
INTRA_8X8_HORIZONTAL:
$for(0,0; <8; 2,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PERROR,%2]<16;16,1>:w REF_LEFT(0,%1)<1;8,0>
}
RETURN
// Mode 2
INTRA_8X8_DC:
// Rearrange reference samples for unified DC prediction code
//
and.nz.f0.0 (16) NULLREG INTRA_PRED_AVAIL<0;1,0>:w 2:w // Top macroblock available for intra prediction?
and.nz.f0.1 (8) NULLREG INTRA_PRED_AVAIL<0;1,0>:w 1:w // Left macroblock available for intra prediction?
(-f0.0.any16h) mov (16) REF_TOP_W(0)<1> 0x8080:uw
(-f0.1.any8h) mov (8) REF_LEFT(0)<1> REF_TOP(0)REGION(8,1)
(-f0.0.any8h) mov (8) REF_TOP(0)<1> REF_LEFT(0)REGION(8,1)
// Perform DC prediction
//
add (8) PRED_YW(15)<1> REF_TOP(0)REGION(8,1) REF_LEFT(0)REGION(8,1)
add (4) PRED_YW(15)<1> PRED_YW(15)REGION(4,1) PRED_YW(15,4)REGION(4,1)
add (2) PRED_YW(15)<1> PRED_YW(15)REGION(2,1) PRED_YW(15,2)REGION(2,1)
add (16) acc0<1>:w PRED_YW(15)REGION(1,0) PRED_YW(15,1)REGION(1,0)
add (16) acc0<1>:w acc0:w 8:w
shr (16) REG_INTRA_TEMP_0<1>:w acc0:w 4:w
// Add error block
$for(0,0; <4; 1,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PERROR,%2]<16;16,1>:w REG_INTRA_TEMP_0<16;16,1>:w
}
RETURN
// Mode 3
INTRA_8X8_DIAG_DOWN_LEFT:
mov (8) REF_TOP(0,16)<1> REF_TOP(0,15)REGION(8,1) // p[16,-1] = p[15,-1]
add (16) acc0<1>:w REF_TOP(0,2)REGION(16,1) 2:w // p[x+2]+2
mac (16) acc0<1>:w REF_TOP(0,1)REGION(16,1) 2:w // 2*p[x+1]+p[x+2]+2
mac (16) acc0<1>:w REF_TOP(0)REGION(16,1) 1:w // p[x]+2*p[x+1]+p[x+2]+2
shr (16) REG_INTRA_TEMP_0<1>:w acc0<16;16,1>:w 2:w // (p[x]+2*p[x+1]+p[x+2]+2)>>2
// Add error block
$for(0,0; <8; 2,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PERROR,%2]<16;16,1>:w REG_INTRA_TEMP_0.%1<1;8,1>:w
}
RETURN
// Mode 4
INTRA_8X8_DIAG_DOWN_RIGHT:
#define INTRA_REF REG_INTRA_TEMP_1
#define REF_TMP REG_INTRA_TEMP_2
// Set inverse shift count
shl (4) REF_TMP<1>:ud REF_LEFT_D(0,1)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order bottom 4 pixels of left ref.
shl (4) REF_TMP.4<1>:ud REF_LEFT_D(0)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order top 4 pixels of left ref.
mov (8) INTRA_REF<1>:ub REF_TMP.3<32;8,4>:ub
mov (16) INTRA_REF.8<1>:ub REF_TOP(0,-1)REGION(16,1) // INTRA_REF holds all reference data
add (16) acc0<1>:w INTRA_REF.2<16;16,1>:ub 2:w // p[x+2]+2
mac (16) acc0<1>:w INTRA_REF.1<16;16,1>:ub 2:w // 2*p[x+1]+p[x+2]+2
mac (16) acc0<1>:w INTRA_REF<16;16,1>:ub 1:w // p[x]+2*p[x+1]+p[x+2]+2
shr (16) INTRA_REF<1>:w acc0<16;16,1>:w 2:w // (p[x]+2*p[x+1]+p[x+2]+2)>>2
// Store data in reversed order
add (2) PBWDCOPY_8<1>:w INV_TRANS48<2;2,1>:b INTRA_TEMP_1*GRFWIB:w // Must match with INTRA_REF
// Add error block
$for(0,96; <8; 2,-32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PBWDCOPY_8,%1*2]<8,1>:w r[PERROR,%2]<16;16,1>:w
}
RETURN
// Mode 5
INTRA_8X8_VERT_RIGHT:
#define INTRA_REF REG_INTRA_TEMP_1
#define REF_TMP REG_INTRA_TEMP_2
#define REF_TMP1 REG_INTRA_TEMP_3
// Set inverse shift count
shl (4) REF_TMP<1>:ud REF_LEFT_D(0,1)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order bottom 4 pixels of left ref.
shl (4) REF_TMP.4<1>:ud REF_LEFT_D(0)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order top 4 pixels of left ref.
mov (8) INTRA_REF<1>:ub REF_TMP.3<32;8,4>:ub
mov (16) INTRA_REF.8<1>:ub REF_TOP(0,-1)REGION(16,1) // INTRA_REF holds all reference data
// Even rows
avg (16) PRED_YW(14)<1> INTRA_REF.8<16;16,1> INTRA_REF.9<16;16,1> // avg(p[x-1],p[x])
// Odd rows
add (16) acc0<1>:w INTRA_REF.3<16;16,1>:ub 2:w // p[x]+2
mac (16) acc0<1>:w INTRA_REF.2<16;16,1>:ub 2:w // 2*p[x-1]+p[x]+2
mac (16) acc0<1>:w INTRA_REF.1<16;16,1>:ub 1:w // p[x-2]+2*p[x-1]+p[x]+2
shr (16) REF_TMP<1>:w acc0:w 2:w // (p[x-2]+2*p[x-1]+p[x]+2)>>2
mov (8) INTRA_REF<1>:ub REF_TMP<16;8,2>:ub // Keep zVR = -1,-2,-3,-4,-5,-6,-7 sequencially
mov (8) INTRA_REF.6<2>:ub REF_TMP.12<16;8,2>:ub // Keep zVR = -1,1,3,5,7,9,11,13 at even byte
mov (8) INTRA_REF.7<2>:ub PRED_Y(14)REGION(8,2) // Combining zVR = 0,2,4,6,8,10,12,14 at odd byte
add (2) PBWDCOPY_8<1>:w INV_TRANS8<2;2,1>:b INTRA_TEMP_1*GRFWIB:w // Must match with INTRA_REF
// Add error block
$for(0,96; <8; 2,-32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PBWDCOPY_8,%1]<8,2>:ub r[PERROR,%2]<16;16,1>:w
}
RETURN
// Mode 6
INTRA_8X8_HOR_DOWN:
// Set inverse shift count
shl (4) REF_TMP<1>:ud REF_LEFT_D(0,1)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order bottom 4 pixels of left ref.
shl (4) REF_TMP.4<1>:ud REF_LEFT_D(0)REGION(1,0) INV_SHIFT<4;4,1>:b // Reverse order top 4 pixels of left ref.
mov (8) INTRA_REF<1>:ub REF_TMP.3<16;4,4>:ub
mov (16) INTRA_REF.8<1>:ub REF_TOP(0,-1)REGION(16,1) // INTRA_REF holds all reference data
// Odd pixels
add (16) acc0<1>:w INTRA_REF.2<16;16,1>:ub 2:w // p[y]+2
mac (16) acc0<1>:w INTRA_REF.1<16;16,1>:ub 2:w // 2*p[y-1]+p[y]+2
mac (16) acc0<1>:w INTRA_REF.0<16;16,1>:ub 1:w // p[y-2]+2*p[y-1]+p[y]+2
shr (16) PRED_YW(14)<1> acc0:w 2:w // (p[y-2]+2*p[y-1]+p[y]+2)>>2
// Even pixels
avg (16) INTRA_REF<1>:w INTRA_REF<16;16,1>:ub INTRA_REF.1<16;16,1>:ub // avg(p[y-1],p[y])
mov (8) INTRA_REF.1<2>:ub PRED_Y(14)REGION(8,2) // Combining odd pixels to form byte type
mov (8) INTRA_REF.16<1>:ub PRED_Y(14,16)REGION(8,2) // Keep zVR = -2,-3,-4,-5,-6,-7 unchanged
// Now INTRA_REF.0 - INTRA_REF.21 contain predicted data
add (2) PBWDCOPY_8<1>:w INV_TRANS48<2;2,1>:b INTRA_TEMP_1*GRFWIB:w // Must match with INTRA_REF
// Add error block
$for(0,96; <13; 4,-32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub r[PBWDCOPY_8,%1]<8,1>:ub r[PERROR,%2]<16;16,1>:w
}
RETURN
// Mode 7
INTRA_8X8_VERT_LEFT:
// Even rows
avg (16) PRED_YW(14)<1> REF_TOP(0)REGION(16,1) REF_TOP(0,1)REGION(16,1) // avg(p[x],p[x+1])
// Odd rows
add (16) acc0<1>:w REF_TOP(0,2)REGION(16,1) 2:w // p[x+2]+2
mac (16) acc0<1>:w REF_TOP(0,1)REGION(16,1) 2:w // 2*p[x+1]+p[x+2]+2
mac (16) acc0<1>:w REF_TOP(0)REGION(16,1) 1:w // p[x]+2*p[x+1]+p[x+2]+2
shr (16) PRED_YW(15)<1> acc0<1;8,1>:w 2:w // (p[x]+2*p[x+1]+p[x+2]+2)>>2
// Add error block
$for(0,0; <4; 1,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub PRED_YW(14,%1)<16;8,1> r[PERROR,%2]<16;16,1>:w
}
RETURN
// Mode 8
INTRA_8X8_HOR_UP:
// Set extra left reference pixels for unified prediction
mov (8) REF_LEFT(0,8)<1> REF_LEFT(0,7)REGION(1,0) // Copy p[-1,7] to p[-1,y],y=8...15
// Even pixels
avg (16) PRED_YW(14)<1> REF_LEFT(0)REGION(16,1) REF_LEFT(0,1)REGION(16,1) // avg(p[y],p[y+1])
// Odd pixels
add (16) acc0<1>:w REF_LEFT(0,2)REGION(16,1) 2:w // p[y+2]+2
mac (16) acc0<1>:w REF_LEFT(0,1)REGION(16,1) 2:w // 2*p[y+1]+p[y+2]+2
mac (16) acc0<1>:w REF_LEFT(0)REGION(16,1) 1:w // p[y]+2*p[y+1]+p[y+2]+2
shr (16) PRED_YW(15)<1> acc0<1;8,1>:w 2:w // (p[y]+2*p[y+1]+p[y+2]+2)>>2
// Merge even/odd pixels
// The predicted data need to be stored in byte type (22 bytes are required)
mov (16) PRED_Y(14,1)<2> PRED_Y(15)REGION(16,2)
// Add error block
$for(0,0; <4; 1,32) {
add.sat (16) r[PPREDBUF_Y,%2]<2>:ub PRED_Y(14,%1*4)<2;8,1> r[PERROR,%2]<16;16,1>:w
}
RETURN
// End of intra_Pred_8X8_Y
#endif // !defined(__INTRA_PRED_8X8_Y__)
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