1/* GRF allocation:
2   g1~g30: constant buffer
3           g1~g2:intra IQ matrix
4           g3~g4:non intra IQ matrix
5           g5~g20:IDCT table
6   g31:    thread payload 
7   g32:    message descriptor for reading reference data
8   g58~g81:reference data
9   g82:    thread payload backup
10   g83~g106:IDCT data                          
11*/
12mov (1) g32.8<1>UD 0x007000fUD  {align1};
13and.nz (1) null g32.16<1,1,1>UW 1UW {align1};
14(f0) jmpi read_backward;
15
16send (16) 0 g34.0<1>UW g32<8,8,1>UW read(5, 2, 0, 2) mlen 1 rlen 4 {align1};
17send (16) 0 g44.0<1>UW g32<8,8,1>UW read(6, 2, 0, 2) mlen 1 rlen 4 {align1};
18jmpi put_data;
19
20read_backward:
21send (16) 0 g34.0<1>UW g32<8,8,1>UW read(8, 2, 0, 2) mlen 1 rlen 4 {align1};
22send (16) 0 g44.0<1>UW g32<8,8,1>UW read(9, 2, 0, 2) mlen 1 rlen 4 {align1};
23
24put_data:
25mov (32) g74.0<1>UW g34.0<16,8,1>UB {align1 compr};
26mov (32) g76.0<1>UW g36.0<16,8,1>UB {align1 compr};
27mov (32) g78.0<1>UW g44.0<16,8,1>UB {align1 compr};
28mov (32) g80.0<1>UW g46.0<16,8,1>UB {align1 compr};
29