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/*
* Copyright (C) 2010-2011 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
#include "jdct.h" /* Private declarations for DCT subsystem */
#ifdef ANDROID_INTELSSE2_IDCT
#include <emmintrin.h>
#if DCTSIZE != 8
Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
#endif
#define BITS_INV_ACC 4
#define SHIFT_INV_ROW 12
#define SHIFT_INV_COL 5
const short RND_INV_ROW = 2048;
const short RND_INV_COL = 16;
const short RND_INV_CORR = 15;
static const short __attribute__ ((aligned(16))) M128_one_corr[8] = {1,1,1,1,1,1,1,1};
static const short __attribute__ ((aligned(16))) M128_round_inv_row[8] = {2048,0,2048,0,2048,0,2048,0};
static const short __attribute__ ((aligned(16))) M128_round_inv_col[8] = {16,16,16,16,16,16,16,16};
static const short __attribute__ ((aligned(16))) M128_round_inv_corr[8] = {15,15,15,15,15,15,15,15};
static const short __attribute__ ((aligned(16))) M128_tg_1_16[8] = {13036, 13036, 13036, 13036, 13036, 13036, 13036, 13036};
static const short __attribute__ ((aligned(16))) M128_tg_2_16[8] = {27146, 27146, 27146, 27146, 27146, 27146, 27146, 27146};
static const short __attribute__ ((aligned(16))) M128_tg_3_16[8] = {-21746, -21746, -21746, -21746, -21746, -21746, -21746, -21746};
static const short __attribute__ ((aligned(16))) M128_cos_4_16[8] = {-19195, -19195, -19195, -19195, -19195, -19195, -19195, -19195};
static const short __attribute__ ((aligned(16))) jpeg_adjust[8] = {128, 128, 128, 128, 128, 128, 128, 128};
// Table for rows 0,4
static const short __attribute__ ((aligned(16))) M128_tab_i_04[32] = {
16384, 21407, 16384, 8867,
16384, -8867, 16384, -21407,
16384, 8867, -16384, -21407,
-16384, 21407, 16384, -8867,
22725, 19266, 19266, -4520,
12873, -22725, 4520, -12873,
12873, 4520, -22725, -12873,
4520, 19266, 19266, -22725
};
// Table for rows 1,7
static const short __attribute__ ((aligned(16))) M128_tab_i_17[32] = {
22725, 29692, 22725, 12299,
22725, -12299, 22725, -29692,
22725, 12299, -22725, -29692,
-22725, 29692, 22725, -12299,
31521, 26722, 26722, -6270,
17855, -31521, 6270, -17855,
17855, 6270, -31521, -17855,
6270, 26722, 26722, -31521
};
// Table for rows 2,6
static const short __attribute__ ((aligned(16))) M128_tab_i_26[32] = {
21407, 27969, 21407, 11585,
21407, -11585, 21407, -27969,
21407, 11585, -21407, -27969,
-21407, 27969, 21407, -11585,
29692, 25172, 25172, -5906,
16819, -29692, 5906, -16819,
16819, 5906, -29692, -16819,
5906, 25172, 25172, -29692
};
// Table for rows 3,5
static const short __attribute__ ((aligned(16))) M128_tab_i_35[32] = {
19266, 25172, 19266, 10426,
19266, -10426, 19266, -25172,
19266, 10426, -19266, -25172,
-19266, 25172, 19266, -10426,
26722, 22654, 22654, -5315,
15137, -26722, 5315, -15137,
15137, 5315, -26722, -15137,
5315, 22654, 22654, -26722
};
/*
* Perform dequantization and inverse DCT on one block of coefficients by SSE.
*/
GLOBAL(void)
jpeg_idct_intelsse (j_decompress_ptr cinfo, jpeg_component_info * compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf, JDIMENSION output_col)
{
__m128i row0, tmp1, tmp2, tmp3, row2, tmp5, tmp6, tmp7;
int ctr;
JSAMPROW outptrTemp;
JSAMPLE *range_limit = IDCT_range_limit(cinfo);
short __attribute__((aligned(16))) quantptrSSE[DCTSIZE2];
short __attribute__((aligned(16))) workspaceSSE[DCTSIZE2];
short __attribute__((aligned(16))) coef_blockSSE[DCTSIZE2];
__m128i x0, x1, x2, x3, x4, x5, x6, x7;
__m128i* tg3, *tg1, *tg2, *cos4;
__m128i tm765, tp765, tm465, tp465, tp03, tm03, tp12, tm12, tp65, tm65;
__m128i t0, t1, t2, t3, t4, t5, t6, t7;
__m128i temp, temp2;
short * wsptr;
unsigned char * outptr;
#define iDCT_8_2ROWs(table1, table2) \
row0 = _mm_shufflelo_epi16(row0, 0xD8); /*x7, x6, x5, x4, x3, x1, x2, x0*/ \
row2 = _mm_shufflelo_epi16(row2, 0xD8); \
tmp1 = _mm_shuffle_epi32(row0, 0); /*x2, x0, x2, x0, x2, x0, x2, x0*/ \
tmp5 = _mm_shuffle_epi32(row2, 0); \
\
tmp3 = _mm_shuffle_epi32(row0, 0x55); /*x3, x1, x3, x1, x3, x1, x3, x1*/ \
tmp7 = _mm_shuffle_epi32(row2, 0x55); \
row0 = _mm_shufflehi_epi16(row0, 0xD8); /*x7, x5, x6, x4, x3, x1, x2, x0*/ \
row2 = _mm_shufflehi_epi16(row2, 0xD8); \
\
tmp1 = _mm_madd_epi16(tmp1, * ( __m128i*)table1); /*x2*w13+x0*w12, x2*w9+x0*w8, x2*w5+x0*w4, x2*w1+x0*w0*/ \
tmp5 = _mm_madd_epi16(tmp5, * ( __m128i*)table2); \
\
tmp2 = _mm_shuffle_epi32(row0, 0xAA); /*x6, x4, x6, x4, x6, x4, x6, x4*/ \
tmp6 = _mm_shuffle_epi32(row2, 0xAA); \
row0 = _mm_shuffle_epi32(row0, 0xFF); /*x7, x5, x7, x5, x7, x5, x7, x5*/ \
row2 = _mm_shuffle_epi32(row2, 0xFF); \
\
tmp3 = _mm_madd_epi16(tmp3, * ( __m128i*)(table1+16)); /*x3*w29+x1*w28, x3*w25+x1*w24, x3*w21+x1*w20, x3*w17+x1*w16*/ \
tmp7 = _mm_madd_epi16(tmp7, * ( __m128i*)(table2+16) ); \
row0 = _mm_madd_epi16(row0, * ( __m128i*)(table1+24)); /*x7*w31+x5*w30, x7*w27+x5*w26, x7*w23+x5*w22, x7*w19+x5*w18*/ \
row2 = _mm_madd_epi16(row2, * ( __m128i*)(table2+24) ); \
tmp2 = _mm_madd_epi16(tmp2, * ( __m128i*)(table1+8) ); /*x6*w15+x4*w14, x6*w11+x4*w10, x6*w7+x4*w6, x6*w3+x4*w2*/ \
tmp6 = _mm_madd_epi16(tmp6, * ( __m128i*)(table2+8) ); \
\
tmp1 = _mm_add_epi32(tmp1, * ( __m128i*)M128_round_inv_row); \
tmp5 = _mm_add_epi32(tmp5, * ( __m128i*)M128_round_inv_row); \
row0 = _mm_add_epi32(row0, tmp3); /*b3, b2, b1, b0*/ \
row2 = _mm_add_epi32(row2, tmp7); \
tmp1 = _mm_add_epi32(tmp1, tmp2); /*a3, a2, a1, a0*/ \
tmp5 = _mm_add_epi32(tmp5, tmp6); \
\
tmp2 = tmp1; \
tmp6 = tmp5; \
tmp2 = _mm_sub_epi32(tmp2, row0); /*for row0. y4= a3-b3, y5=a2-b2, y6=a1-b1, y7=a0-b0 */ \
tmp6 = _mm_sub_epi32(tmp6, row2); \
row0 = _mm_add_epi32(row0, tmp1); /*y3=a3+b3,y2=a2+b2,y1=a1+b1,y0=a0+b0*/ \
row2 = _mm_add_epi32(row2, tmp5); \
tmp2 = _mm_srai_epi32(tmp2, SHIFT_INV_ROW); \
tmp6 = _mm_srai_epi32(tmp6, SHIFT_INV_ROW); \
row0 = _mm_srai_epi32(row0, SHIFT_INV_ROW); \
row2 = _mm_srai_epi32(row2, SHIFT_INV_ROW); \
tmp2 = _mm_shuffle_epi32(tmp2, 0x1B); /*y7, y6, y5, y4*/ \
tmp6 = _mm_shuffle_epi32(tmp6, 0x1B); \
row0 = _mm_packs_epi32(row0, tmp2); /*row0 = y7,y6,y5,y4,y3,y2,y1,y0*/ \
row2 = _mm_packs_epi32(row2, tmp6); /*row2 = y7,...y0*/
#define iDCT_8_COL() \
x3 = _mm_load_si128(( __m128i*)(wsptr+24));\
x1 = _mm_load_si128(( __m128i*)(wsptr+8));\
x5 = row0;\
x7 = row2;\
\
tg3 = ( __m128i*)(M128_tg_3_16);\
tg1 = ( __m128i*)(M128_tg_1_16);\
tg2 = ( __m128i*)(M128_tg_2_16);\
cos4 =(__m128i*)(M128_cos_4_16);\
\
temp = _mm_mulhi_epi16(x5, *tg3); /*row5*tg3*/ \
temp2 = _mm_mulhi_epi16(x3, *tg3);\
temp = _mm_adds_epi16(temp, x5); /*coef adjustment*/ \
temp2 = _mm_adds_epi16(temp2, x3);\
tm765 = _mm_adds_epi16(temp, x3);\
tm465 = _mm_subs_epi16(x5, temp2);\
\
temp = _mm_mulhi_epi16(x7, *tg1); /*row7*tg1*/ \
temp2 = _mm_mulhi_epi16(x1, *tg1);\
tp765 = _mm_adds_epi16(temp, x1);\
tp465 = _mm_subs_epi16(temp2, x7); /*row1*tg1 - row7*/ \
\
t7 = _mm_adds_epi16(tp765, tm765);\
t7 = _mm_adds_epi16(t7, *( __m128i*)M128_one_corr);\
tp65 = _mm_subs_epi16(tp765, tm765);\
t4 = _mm_adds_epi16(tp465, tm465);\
tm65 = _mm_subs_epi16(tp465, tm465);\
tm65 = _mm_adds_epi16(tm65, *( __m128i*)M128_one_corr);\
\
x0 = _mm_load_si128(( __m128i*)(wsptr));\
x4 = _mm_load_si128(( __m128i*)(wsptr+32));\
x2 = _mm_load_si128(( __m128i*)(wsptr+16));\
x6 = _mm_load_si128(( __m128i*)(wsptr+48));\
\
/*t6 = ( tp65 + tm65 ) * cos_4_16;*/ \
temp = _mm_adds_epi16(tp65, tm65);\
temp2 = _mm_subs_epi16(tp65, tm65);\
t6 = _mm_mulhi_epi16(temp, *cos4);\
t5 = _mm_mulhi_epi16(temp2, *cos4);\
t6 = _mm_adds_epi16(t6, temp);\
t6 = _mm_or_si128(t6, *( __m128i*)M128_one_corr);\
t5 = _mm_adds_epi16(t5, temp2);\
t5 = _mm_or_si128(t5, *( __m128i*)M128_one_corr);\
\
tp03 = _mm_adds_epi16(x0, x4);\
tp12 = _mm_subs_epi16(x0, x4);\
\
temp = _mm_mulhi_epi16(x6, *tg2);\
temp2 = _mm_mulhi_epi16(x2, *tg2);\
tm03 = _mm_adds_epi16(temp, x2);\
tm12 = _mm_subs_epi16(temp2, x6);\
\
t0 = _mm_adds_epi16(tp03, tm03);\
t0 = _mm_adds_epi16(t0, *( __m128i*)M128_round_inv_col);\
t3 = _mm_subs_epi16(tp03, tm03);\
t3 = _mm_adds_epi16(t3, *( __m128i*)M128_round_inv_corr);\
t1 = _mm_adds_epi16(tp12, tm12);\
t1 = _mm_adds_epi16(t1, *( __m128i*)M128_round_inv_col);\
t2 = _mm_subs_epi16(tp12, tm12);\
t2 = _mm_adds_epi16(t2, *( __m128i*)M128_round_inv_corr);\
\
temp = _mm_adds_epi16(t0, t7); /*y0*/ \
temp2 = _mm_adds_epi16(t1, t6); /*y1*/ \
temp = _mm_srai_epi16(temp, SHIFT_INV_COL);\
temp2 = _mm_srai_epi16(temp2, SHIFT_INV_COL);\
temp = _mm_adds_epi16(temp, *( __m128i*)jpeg_adjust); /*Add 128 for jpeg decoding*/ \
temp2 = _mm_adds_epi16(temp2, *( __m128i*)jpeg_adjust);\
\
temp = _mm_packus_epi16(temp, temp2);\
_mm_store_si128(( __m128i*)(outptr), temp); /*store y0, y1*/ \
\
temp = _mm_adds_epi16(t2, t5);\
temp2 = _mm_adds_epi16(t3, t4);\
temp = _mm_srai_epi16(temp, SHIFT_INV_COL);\
temp2 = _mm_srai_epi16(temp2, SHIFT_INV_COL);\
temp = _mm_adds_epi16(temp, *( __m128i*)jpeg_adjust);\
temp2 = _mm_adds_epi16(temp2, *( __m128i*)jpeg_adjust);\
\
temp = _mm_packus_epi16(temp, temp2);\
_mm_store_si128(( __m128i*)(outptr+16), temp); /*store y2, y3*/ \
\
temp = _mm_subs_epi16(t3, t4);\
temp2 = _mm_subs_epi16(t2, t5);\
temp = _mm_srai_epi16(temp, SHIFT_INV_COL);\
temp2 = _mm_srai_epi16(temp2, SHIFT_INV_COL);\
temp = _mm_adds_epi16(temp, *( __m128i*)jpeg_adjust);\
temp2 = _mm_adds_epi16(temp2, *( __m128i*)jpeg_adjust);\
\
temp = _mm_packus_epi16(temp, temp2);\
_mm_store_si128(( __m128i*)(outptr+32), temp); /*store y4, y5*/ \
\
temp = _mm_subs_epi16(t1, t6);\
temp2 = _mm_subs_epi16(t0, t7);\
temp = _mm_srai_epi16(temp, SHIFT_INV_COL);\
temp2 = _mm_srai_epi16(temp2, SHIFT_INV_COL);\
temp = _mm_adds_epi16(temp, *( __m128i*)jpeg_adjust);\
temp2 = _mm_adds_epi16(temp2, *( __m128i*)jpeg_adjust);\
\
temp = _mm_packus_epi16(temp, temp2);\
_mm_store_si128(( __m128i*)(outptr+48), temp); /*store y6, y7*/
/*Memcpy to do 16byte alignment. */
memcpy((char*)quantptrSSE, (char*)compptr->dct_table, sizeof(quantptrSSE));
memcpy((char*)coef_blockSSE, (char*)coef_block, sizeof(coef_blockSSE));
wsptr = (short *)workspaceSSE;
outptr = (unsigned char*)workspaceSSE;
// row 0 and row 2
row0 = _mm_load_si128((__m128i const*)(coef_blockSSE));
row2 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*2));
row0 = _mm_mullo_epi16( row0, *(__m128i const*)quantptrSSE );
row2 = _mm_mullo_epi16( row2, *(__m128i const*)(quantptrSSE+8*2) );
iDCT_8_2ROWs(M128_tab_i_04, M128_tab_i_26);
_mm_store_si128((__m128i*)(wsptr), row0);
_mm_store_si128((__m128i*)(wsptr+8*2), row2);
// row 4 and row 6
row0 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*4));
row2 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*6));
row0 = _mm_mullo_epi16(row0, *(__m128i const*)(quantptrSSE+8*4) );
row2 = _mm_mullo_epi16(row2, *(__m128i const*)(quantptrSSE+8*6) );
iDCT_8_2ROWs(M128_tab_i_04, M128_tab_i_26);
_mm_store_si128((__m128i*)(wsptr+32), row0);
_mm_store_si128((__m128i*)(wsptr+48), row2);
// row 3 and row 1
row0 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*3));
row2 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*1));
row0 = _mm_mullo_epi16(row0, *(__m128i const*)(quantptrSSE+24) );
row2 = _mm_mullo_epi16(row2, *(__m128i const*)(quantptrSSE+8) );
iDCT_8_2ROWs(M128_tab_i_35, M128_tab_i_17);
_mm_store_si128((__m128i*)(wsptr+24), row0);
_mm_store_si128((__m128i*)(wsptr+8), row2);
// row 5 and row 7
row0 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*5));
row2 = _mm_load_si128((__m128i const*)(coef_blockSSE+8*7));
row0 = _mm_mullo_epi16(row0, *(__m128i const*)(quantptrSSE+40) );
row2 = _mm_mullo_epi16(row2, *(__m128i const*)(quantptrSSE+56));
iDCT_8_2ROWs( M128_tab_i_35, M128_tab_i_17);
iDCT_8_COL();
for(ctr = 0; ctr < DCTSIZE; ctr++)
{
outptrTemp = output_buf[ctr] + output_col;
memcpy(outptrTemp, outptr, DCTSIZE);
outptr += DCTSIZE; /* advance pointer to next row */
}
return;
}
#endif /* ANDROID_INTELSSE2_IDCT */
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