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1 /*
2  * Loongson MMI optimizations for libjpeg-turbo
3  *
4  * Copyright (C) 2014, 2018, D. R. Commander.  All Rights Reserved.
5  * Copyright (C) 2016-2017, Loongson Technology Corporation Limited, BeiJing.
6  *                          All Rights Reserved.
7  * Authors:  ZhuChen     <zhuchen@loongson.cn>
8  *           CaiWanwei   <caiwanwei@loongson.cn>
9  *           SunZhangzhi <sunzhangzhi-cq@loongson.cn>
10  *
11  * Based on the x86 SIMD extension for IJG JPEG library
12  * Copyright (C) 1999-2006, MIYASAKA Masaru.
13  *
14  * This software is provided 'as-is', without any express or implied
15  * warranty.  In no event will the authors be held liable for any damages
16  * arising from the use of this software.
17  *
18  * Permission is granted to anyone to use this software for any purpose,
19  * including commercial applications, and to alter it and redistribute it
20  * freely, subject to the following restrictions:
21  *
22  * 1. The origin of this software must not be misrepresented; you must not
23  *    claim that you wrote the original software. If you use this software
24  *    in a product, an acknowledgment in the product documentation would be
25  *    appreciated but is not required.
26  * 2. Altered source versions must be plainly marked as such, and must not be
27  *    misrepresented as being the original software.
28  * 3. This notice may not be removed or altered from any source distribution.
29  */
30 
31 /* SLOW INTEGER FORWARD DCT */
32 
33 #include "jsimd_mmi.h"
34 
35 
36 #define CONST_BITS  13
37 #define PASS1_BITS  2
38 #define DESCALE_P1  (CONST_BITS - PASS1_BITS)
39 #define DESCALE_P2  (CONST_BITS + PASS1_BITS)
40 
41 #define FIX_0_298  ((short)2446)   /* FIX(0.298631336) */
42 #define FIX_0_390  ((short)3196)   /* FIX(0.390180644) */
43 #define FIX_0_541  ((short)4433)   /* FIX(0.541196100) */
44 #define FIX_0_765  ((short)6270)   /* FIX(0.765366865) */
45 #define FIX_0_899  ((short)7373)   /* FIX(0.899976223) */
46 #define FIX_1_175  ((short)9633)   /* FIX(1.175875602) */
47 #define FIX_1_501  ((short)12299)  /* FIX(1.501321110) */
48 #define FIX_1_847  ((short)15137)  /* FIX(1.847759065) */
49 #define FIX_1_961  ((short)16069)  /* FIX(1.961570560) */
50 #define FIX_2_053  ((short)16819)  /* FIX(2.053119869) */
51 #define FIX_2_562  ((short)20995)  /* FIX(2.562915447) */
52 #define FIX_3_072  ((short)25172)  /* FIX(3.072711026) */
53 
54 enum const_index {
55   index_PW_F130_F054,
56   index_PW_F054_MF130,
57   index_PW_MF078_F117,
58   index_PW_F117_F078,
59   index_PW_MF060_MF089,
60   index_PW_MF089_F060,
61   index_PW_MF050_MF256,
62   index_PW_MF256_F050,
63   index_PD_DESCALE_P1,
64   index_PD_DESCALE_P2,
65   index_PW_DESCALE_P2X
66 };
67 
68 static uint64_t const_value[] = {
69   _uint64_set_pi16(FIX_0_541, (FIX_0_541 + FIX_0_765),
70                    FIX_0_541, (FIX_0_541 + FIX_0_765)),
71   _uint64_set_pi16((FIX_0_541 - FIX_1_847), FIX_0_541,
72                    (FIX_0_541 - FIX_1_847), FIX_0_541),
73   _uint64_set_pi16(FIX_1_175, (FIX_1_175 - FIX_1_961),
74                    FIX_1_175, (FIX_1_175 - FIX_1_961)),
75   _uint64_set_pi16((FIX_1_175 - FIX_0_390), FIX_1_175,
76                    (FIX_1_175 - FIX_0_390), FIX_1_175),
77   _uint64_set_pi16(-FIX_0_899, (FIX_0_298 - FIX_0_899),
78                    -FIX_0_899, (FIX_0_298 - FIX_0_899)),
79   _uint64_set_pi16((FIX_1_501 - FIX_0_899), -FIX_0_899,
80                    (FIX_1_501 - FIX_0_899), -FIX_0_899),
81   _uint64_set_pi16(-FIX_2_562, (FIX_2_053 - FIX_2_562),
82                    -FIX_2_562, (FIX_2_053 - FIX_2_562)),
83   _uint64_set_pi16((FIX_3_072 - FIX_2_562), -FIX_2_562,
84                    (FIX_3_072 - FIX_2_562), -FIX_2_562),
85   _uint64_set_pi32((1 << (DESCALE_P1 - 1)), (1 << (DESCALE_P1 - 1))),
86   _uint64_set_pi32((1 << (DESCALE_P2 - 1)), (1 << (DESCALE_P2 - 1))),
87   _uint64_set_pi16((1 << (PASS1_BITS - 1)), (1 << (PASS1_BITS - 1)),
88                    (1 << (PASS1_BITS - 1)), (1 << (PASS1_BITS - 1)))
89 };
90 
91 #define PW_F130_F054    get_const_value(index_PW_F130_F054)
92 #define PW_F054_MF130   get_const_value(index_PW_F054_MF130)
93 #define PW_MF078_F117   get_const_value(index_PW_MF078_F117)
94 #define PW_F117_F078    get_const_value(index_PW_F117_F078)
95 #define PW_MF060_MF089  get_const_value(index_PW_MF060_MF089)
96 #define PW_MF089_F060   get_const_value(index_PW_MF089_F060)
97 #define PW_MF050_MF256  get_const_value(index_PW_MF050_MF256)
98 #define PW_MF256_F050   get_const_value(index_PW_MF256_F050)
99 #define PD_DESCALE_P1   get_const_value(index_PD_DESCALE_P1)
100 #define PD_DESCALE_P2   get_const_value(index_PD_DESCALE_P2)
101 #define PW_DESCALE_P2X  get_const_value(index_PW_DESCALE_P2X)
102 
103 
104 #define DO_FDCT_COMMON(PASS) { \
105   __m64 tmp1312l, tmp1312h, tmp47l, tmp47h, tmp4l, tmp4h, tmp7l, tmp7h; \
106   __m64 tmp56l, tmp56h, tmp5l, tmp5h, tmp6l, tmp6h; \
107   __m64 out1l, out1h, out2l, out2h, out3l, out3h; \
108   __m64 out5l, out5h, out6l, out6h, out7l, out7h; \
109   __m64 z34l, z34h, z3l, z3h, z4l, z4h, z3, z4; \
110   \
111   /* (Original) \
112    * z1 = (tmp12 + tmp13) * 0.541196100; \
113    * out2 = z1 + tmp13 * 0.765366865; \
114    * out6 = z1 + tmp12 * -1.847759065; \
115    * \
116    * (This implementation) \
117    * out2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; \
118    * out6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); \
119    */ \
120   \
121   tmp1312l = _mm_unpacklo_pi16(tmp13, tmp12); \
122   tmp1312h = _mm_unpackhi_pi16(tmp13, tmp12); \
123   \
124   out2l = _mm_madd_pi16(tmp1312l, PW_F130_F054); \
125   out2h = _mm_madd_pi16(tmp1312h, PW_F130_F054); \
126   out6l = _mm_madd_pi16(tmp1312l, PW_F054_MF130); \
127   out6h = _mm_madd_pi16(tmp1312h, PW_F054_MF130); \
128   \
129   out2l = _mm_add_pi32(out2l, PD_DESCALE_P##PASS); \
130   out2h = _mm_add_pi32(out2h, PD_DESCALE_P##PASS); \
131   out2l = _mm_srai_pi32(out2l, DESCALE_P##PASS); \
132   out2h = _mm_srai_pi32(out2h, DESCALE_P##PASS); \
133   \
134   out6l = _mm_add_pi32(out6l, PD_DESCALE_P##PASS); \
135   out6h = _mm_add_pi32(out6h, PD_DESCALE_P##PASS); \
136   out6l = _mm_srai_pi32(out6l, DESCALE_P##PASS); \
137   out6h = _mm_srai_pi32(out6h, DESCALE_P##PASS); \
138   \
139   out2 = _mm_packs_pi32(out2l, out2h); \
140   out6 = _mm_packs_pi32(out6l, out6h); \
141   \
142   /* Odd part */ \
143   \
144   z3 = _mm_add_pi16(tmp4, tmp6); \
145   z4 = _mm_add_pi16(tmp5, tmp7); \
146   \
147   /* (Original) \
148    * z5 = (z3 + z4) * 1.175875602; \
149    * z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644; \
150    * z3 += z5;  z4 += z5; \
151    * \
152    * (This implementation) \
153    * z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; \
154    * z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); \
155    */ \
156   \
157   z34l = _mm_unpacklo_pi16(z3, z4); \
158   z34h = _mm_unpackhi_pi16(z3, z4); \
159   z3l = _mm_madd_pi16(z34l, PW_MF078_F117); \
160   z3h = _mm_madd_pi16(z34h, PW_MF078_F117); \
161   z4l = _mm_madd_pi16(z34l, PW_F117_F078); \
162   z4h = _mm_madd_pi16(z34h, PW_F117_F078); \
163   \
164   /* (Original) \
165    * z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6; \
166    * tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869; \
167    * tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110; \
168    * z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447; \
169    * out7 = tmp4 + z1 + z3;  out5 = tmp5 + z2 + z4; \
170    * out3 = tmp6 + z2 + z3;  out1 = tmp7 + z1 + z4; \
171    * \
172    * (This implementation) \
173    * tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; \
174    * tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; \
175    * tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); \
176    * tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); \
177    * out7 = tmp4 + z3;  out5 = tmp5 + z4; \
178    * out3 = tmp6 + z3;  out1 = tmp7 + z4; \
179    */ \
180   \
181   tmp47l = _mm_unpacklo_pi16(tmp4, tmp7); \
182   tmp47h = _mm_unpackhi_pi16(tmp4, tmp7); \
183   \
184   tmp4l = _mm_madd_pi16(tmp47l, PW_MF060_MF089); \
185   tmp4h = _mm_madd_pi16(tmp47h, PW_MF060_MF089); \
186   tmp7l = _mm_madd_pi16(tmp47l, PW_MF089_F060); \
187   tmp7h = _mm_madd_pi16(tmp47h, PW_MF089_F060); \
188   \
189   out7l = _mm_add_pi32(tmp4l, z3l); \
190   out7h = _mm_add_pi32(tmp4h, z3h); \
191   out1l = _mm_add_pi32(tmp7l, z4l); \
192   out1h = _mm_add_pi32(tmp7h, z4h); \
193   \
194   out7l = _mm_add_pi32(out7l, PD_DESCALE_P##PASS); \
195   out7h = _mm_add_pi32(out7h, PD_DESCALE_P##PASS); \
196   out7l = _mm_srai_pi32(out7l, DESCALE_P##PASS); \
197   out7h = _mm_srai_pi32(out7h, DESCALE_P##PASS); \
198   \
199   out1l = _mm_add_pi32(out1l, PD_DESCALE_P##PASS); \
200   out1h = _mm_add_pi32(out1h, PD_DESCALE_P##PASS); \
201   out1l = _mm_srai_pi32(out1l, DESCALE_P##PASS); \
202   out1h = _mm_srai_pi32(out1h, DESCALE_P##PASS); \
203   \
204   out7 = _mm_packs_pi32(out7l, out7h); \
205   out1 = _mm_packs_pi32(out1l, out1h); \
206   \
207   tmp56l = _mm_unpacklo_pi16(tmp5, tmp6); \
208   tmp56h = _mm_unpackhi_pi16(tmp5, tmp6); \
209   \
210   tmp5l = _mm_madd_pi16(tmp56l, PW_MF050_MF256); \
211   tmp5h = _mm_madd_pi16(tmp56h, PW_MF050_MF256); \
212   tmp6l = _mm_madd_pi16(tmp56l, PW_MF256_F050); \
213   tmp6h = _mm_madd_pi16(tmp56h, PW_MF256_F050); \
214   \
215   out5l = _mm_add_pi32(tmp5l, z4l); \
216   out5h = _mm_add_pi32(tmp5h, z4h); \
217   out3l = _mm_add_pi32(tmp6l, z3l); \
218   out3h = _mm_add_pi32(tmp6h, z3h); \
219   \
220   out5l = _mm_add_pi32(out5l, PD_DESCALE_P##PASS); \
221   out5h = _mm_add_pi32(out5h, PD_DESCALE_P##PASS); \
222   out5l = _mm_srai_pi32(out5l, DESCALE_P##PASS); \
223   out5h = _mm_srai_pi32(out5h, DESCALE_P##PASS); \
224   \
225   out3l = _mm_add_pi32(out3l, PD_DESCALE_P##PASS); \
226   out3h = _mm_add_pi32(out3h, PD_DESCALE_P##PASS); \
227   out3l = _mm_srai_pi32(out3l, DESCALE_P##PASS); \
228   out3h = _mm_srai_pi32(out3h, DESCALE_P##PASS); \
229   \
230   out5 = _mm_packs_pi32(out5l, out5h); \
231   out3 = _mm_packs_pi32(out3l, out3h); \
232 }
233 
234 #define DO_FDCT_PASS1() { \
235   __m64 row0l, row0h, row1l, row1h, row2l, row2h, row3l, row3h; \
236   __m64 row01a, row01b, row01c, row01d, row23a, row23b, row23c, row23d; \
237   __m64 col0, col1, col2, col3, col4, col5, col6, col7; \
238   __m64 tmp10, tmp11; \
239   \
240   row0l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0]);     /* (00 01 02 03) */ \
241   row0h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0 + 4]); /* (04 05 06 07) */ \
242   row1l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1]);     /* (10 11 12 13) */ \
243   row1h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1 + 4]); /* (14 15 16 17) */ \
244   row2l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2]);     /* (20 21 22 23) */ \
245   row2h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2 + 4]); /* (24 25 26 27) */ \
246   row3l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3]);     /* (30 31 32 33) */ \
247   row3h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3 + 4]); /* (34 35 36 37) */ \
248   \
249   /* Transpose coefficients */ \
250   \
251   row23a = _mm_unpacklo_pi16(row2l, row3l);   /* row23a=(20 30 21 31) */ \
252   row23b = _mm_unpackhi_pi16(row2l, row3l);   /* row23b=(22 32 23 33) */ \
253   row23c = _mm_unpacklo_pi16(row2h, row3h);   /* row23c=(24 34 25 35) */ \
254   row23d = _mm_unpackhi_pi16(row2h, row3h);   /* row23d=(26 36 27 37) */ \
255   \
256   row01a = _mm_unpacklo_pi16(row0l, row1l);   /* row01a=(00 10 01 11) */ \
257   row01b = _mm_unpackhi_pi16(row0l, row1l);   /* row01b=(02 12 03 13) */ \
258   row01c = _mm_unpacklo_pi16(row0h, row1h);   /* row01c=(04 14 05 15) */ \
259   row01d = _mm_unpackhi_pi16(row0h, row1h);   /* row01d=(06 16 07 17) */ \
260   \
261   col0 = _mm_unpacklo_pi32(row01a, row23a);   /* col0=(00 10 20 30) */ \
262   col1 = _mm_unpackhi_pi32(row01a, row23a);   /* col1=(01 11 21 31) */ \
263   col6 = _mm_unpacklo_pi32(row01d, row23d);   /* col6=(06 16 26 36) */ \
264   col7 = _mm_unpackhi_pi32(row01d, row23d);   /* col7=(07 17 27 37) */ \
265   \
266   tmp6 = _mm_sub_pi16(col1, col6);            /* tmp6=col1-col6 */ \
267   tmp7 = _mm_sub_pi16(col0, col7);            /* tmp7=col0-col7 */ \
268   tmp1 = _mm_add_pi16(col1, col6);            /* tmp1=col1+col6 */ \
269   tmp0 = _mm_add_pi16(col0, col7);            /* tmp0=col0+col7 */ \
270   \
271   col2 = _mm_unpacklo_pi32(row01b, row23b);   /* col2=(02 12 22 32) */ \
272   col3 = _mm_unpackhi_pi32(row01b, row23b);   /* col3=(03 13 23 33) */ \
273   col4 = _mm_unpacklo_pi32(row01c, row23c);   /* col4=(04 14 24 34) */ \
274   col5 = _mm_unpackhi_pi32(row01c, row23c);   /* col5=(05 15 25 35) */ \
275   \
276   tmp3 = _mm_add_pi16(col3, col4);            /* tmp3=col3+col4 */ \
277   tmp2 = _mm_add_pi16(col2, col5);            /* tmp2=col2+col5 */ \
278   tmp4 = _mm_sub_pi16(col3, col4);            /* tmp4=col3-col4 */ \
279   tmp5 = _mm_sub_pi16(col2, col5);            /* tmp5=col2-col5 */ \
280   \
281   /* Even part */ \
282   \
283   tmp10 = _mm_add_pi16(tmp0, tmp3);           /* tmp10=tmp0+tmp3 */ \
284   tmp13 = _mm_sub_pi16(tmp0, tmp3);           /* tmp13=tmp0-tmp3 */ \
285   tmp11 = _mm_add_pi16(tmp1, tmp2);           /* tmp11=tmp1+tmp2 */ \
286   tmp12 = _mm_sub_pi16(tmp1, tmp2);           /* tmp12=tmp1-tmp2 */ \
287   \
288   out0 = _mm_add_pi16(tmp10, tmp11);          /* out0=tmp10+tmp11 */ \
289   out4 = _mm_sub_pi16(tmp10, tmp11);          /* out4=tmp10-tmp11 */ \
290   out0 = _mm_slli_pi16(out0, PASS1_BITS); \
291   out4 = _mm_slli_pi16(out4, PASS1_BITS); \
292   \
293   DO_FDCT_COMMON(1) \
294   \
295   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0], out0); \
296   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0 + 4], out4); \
297   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1], out1); \
298   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1 + 4], out5); \
299   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2], out2); \
300   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2 + 4], out6); \
301   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3], out3); \
302   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3 + 4], out7); \
303 }
304 
305 #define DO_FDCT_PASS2() { \
306   __m64 col0l, col0h, col1l, col1h, col2l, col2h, col3l, col3h; \
307   __m64 col01a, col01b, col01c, col01d, col23a, col23b, col23c, col23d; \
308   __m64 row0, row1, row2, row3, row4, row5, row6, row7; \
309   __m64 tmp10, tmp11; \
310   \
311   col0l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 0]);  /* (00 10 20 30) */ \
312   col1l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 1]);  /* (01 11 21 31) */ \
313   col2l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 2]);  /* (02 12 22 32) */ \
314   col3l = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 3]);  /* (03 13 23 33) */ \
315   col0h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 4]);  /* (40 50 60 70) */ \
316   col1h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 5]);  /* (41 51 61 71) */ \
317   col2h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 6]);  /* (42 52 62 72) */ \
318   col3h = _mm_load_si64((__m64 *)&dataptr[DCTSIZE * 7]);  /* (43 53 63 73) */ \
319   \
320   /* Transpose coefficients */ \
321   \
322   col23a = _mm_unpacklo_pi16(col2l, col3l);   /* col23a=(02 03 12 13) */ \
323   col23b = _mm_unpackhi_pi16(col2l, col3l);   /* col23b=(22 23 32 33) */ \
324   col23c = _mm_unpacklo_pi16(col2h, col3h);   /* col23c=(42 43 52 53) */ \
325   col23d = _mm_unpackhi_pi16(col2h, col3h);   /* col23d=(62 63 72 73) */ \
326   \
327   col01a = _mm_unpacklo_pi16(col0l, col1l);   /* col01a=(00 01 10 11) */ \
328   col01b = _mm_unpackhi_pi16(col0l, col1l);   /* col01b=(20 21 30 31) */ \
329   col01c = _mm_unpacklo_pi16(col0h, col1h);   /* col01c=(40 41 50 51) */ \
330   col01d = _mm_unpackhi_pi16(col0h, col1h);   /* col01d=(60 61 70 71) */ \
331   \
332   row0 = _mm_unpacklo_pi32(col01a, col23a);   /* row0=(00 01 02 03) */ \
333   row1 = _mm_unpackhi_pi32(col01a, col23a);   /* row1=(10 11 12 13) */ \
334   row6 = _mm_unpacklo_pi32(col01d, col23d);   /* row6=(60 61 62 63) */ \
335   row7 = _mm_unpackhi_pi32(col01d, col23d);   /* row7=(70 71 72 73) */ \
336   \
337   tmp6 = _mm_sub_pi16(row1, row6);            /* tmp6=row1-row6 */ \
338   tmp7 = _mm_sub_pi16(row0, row7);            /* tmp7=row0-row7 */ \
339   tmp1 = _mm_add_pi16(row1, row6);            /* tmp1=row1+row6 */ \
340   tmp0 = _mm_add_pi16(row0, row7);            /* tmp0=row0+row7 */ \
341   \
342   row2 = _mm_unpacklo_pi32(col01b, col23b);   /* row2=(20 21 22 23) */ \
343   row3 = _mm_unpackhi_pi32(col01b, col23b);   /* row3=(30 31 32 33) */ \
344   row4 = _mm_unpacklo_pi32(col01c, col23c);   /* row4=(40 41 42 43) */ \
345   row5 = _mm_unpackhi_pi32(col01c, col23c);   /* row5=(50 51 52 53) */ \
346   \
347   tmp3 = _mm_add_pi16(row3, row4);            /* tmp3=row3+row4 */ \
348   tmp2 = _mm_add_pi16(row2, row5);            /* tmp2=row2+row5 */ \
349   tmp4 = _mm_sub_pi16(row3, row4);            /* tmp4=row3-row4 */ \
350   tmp5 = _mm_sub_pi16(row2, row5);            /* tmp5=row2-row5 */ \
351   \
352   /* Even part */ \
353   \
354   tmp10 = _mm_add_pi16(tmp0, tmp3);           /* tmp10=tmp0+tmp3 */ \
355   tmp13 = _mm_sub_pi16(tmp0, tmp3);           /* tmp13=tmp0-tmp3 */ \
356   tmp11 = _mm_add_pi16(tmp1, tmp2);           /* tmp11=tmp1+tmp2 */ \
357   tmp12 = _mm_sub_pi16(tmp1, tmp2);           /* tmp12=tmp1-tmp2 */ \
358   \
359   out0 = _mm_add_pi16(tmp10, tmp11);          /* out0=tmp10+tmp11 */ \
360   out4 = _mm_sub_pi16(tmp10, tmp11);          /* out4=tmp10-tmp11 */ \
361   \
362   out0 = _mm_add_pi16(out0, PW_DESCALE_P2X); \
363   out4 = _mm_add_pi16(out4, PW_DESCALE_P2X); \
364   out0 = _mm_srai_pi16(out0, PASS1_BITS); \
365   out4 = _mm_srai_pi16(out4, PASS1_BITS); \
366   \
367   DO_FDCT_COMMON(2) \
368   \
369   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 0], out0); \
370   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 1], out1); \
371   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 2], out2); \
372   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 3], out3); \
373   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 4], out4); \
374   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 5], out5); \
375   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 6], out6); \
376   _mm_store_si64((__m64 *)&dataptr[DCTSIZE * 7], out7); \
377 }
378 
jsimd_fdct_islow_mmi(DCTELEM * data)379 void jsimd_fdct_islow_mmi(DCTELEM *data)
380 {
381   __m64 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
382   __m64 out0, out1, out2, out3, out4, out5, out6, out7;
383   __m64 tmp12, tmp13;
384   DCTELEM *dataptr = data;
385 
386   /* Pass 1: process rows. */
387 
388   DO_FDCT_PASS1()
389   dataptr += DCTSIZE * 4;
390   DO_FDCT_PASS1()
391 
392   /* Pass 2: process columns. */
393 
394   dataptr = data;
395   DO_FDCT_PASS2()
396   dataptr += 4;
397   DO_FDCT_PASS2()
398 }
399