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1 /*
2  * AltiVec optimizations for libjpeg-turbo
3  *
4  * Copyright (C) 2014, D. R. Commander.  All Rights Reserved.
5  *
6  * This software is provided 'as-is', without any express or implied
7  * warranty.  In no event will the authors be held liable for any damages
8  * arising from the use of this software.
9  *
10  * Permission is granted to anyone to use this software for any purpose,
11  * including commercial applications, and to alter it and redistribute it
12  * freely, subject to the following restrictions:
13  *
14  * 1. The origin of this software must not be misrepresented; you must not
15  *    claim that you wrote the original software. If you use this software
16  *    in a product, an acknowledgment in the product documentation would be
17  *    appreciated but is not required.
18  * 2. Altered source versions must be plainly marked as such, and must not be
19  *    misrepresented as being the original software.
20  * 3. This notice may not be removed or altered from any source distribution.
21  */
22 
23 /* SLOW INTEGER FORWARD DCT */
24 
25 #include "jsimd_altivec.h"
26 
27 
28 #define F_0_298  2446   /* FIX(0.298631336) */
29 #define F_0_390  3196   /* FIX(0.390180644) */
30 #define F_0_541  4433   /* FIX(0.541196100) */
31 #define F_0_765  6270   /* FIX(0.765366865) */
32 #define F_0_899  7373   /* FIX(0.899976223) */
33 #define F_1_175  9633   /* FIX(1.175875602) */
34 #define F_1_501  12299  /* FIX(1.501321110) */
35 #define F_1_847  15137  /* FIX(1.847759065) */
36 #define F_1_961  16069  /* FIX(1.961570560) */
37 #define F_2_053  16819  /* FIX(2.053119869) */
38 #define F_2_562  20995  /* FIX(2.562915447) */
39 #define F_3_072  25172  /* FIX(3.072711026) */
40 
41 #define CONST_BITS  13
42 #define PASS1_BITS  2
43 #define DESCALE_P1  (CONST_BITS - PASS1_BITS)
44 #define DESCALE_P2  (CONST_BITS + PASS1_BITS)
45 
46 
47 #define DO_FDCT_COMMON(PASS) { \
48   /* (Original) \
49    * z1 = (tmp12 + tmp13) * 0.541196100; \
50    * data2 = z1 + tmp13 * 0.765366865; \
51    * data6 = z1 + tmp12 * -1.847759065; \
52    * \
53    * (This implementation) \
54    * data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100; \
55    * data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065); \
56    */ \
57   \
58   tmp1312l = vec_mergeh(tmp13, tmp12); \
59   tmp1312h = vec_mergel(tmp13, tmp12); \
60   \
61   out2l = vec_msums(tmp1312l, pw_f130_f054, pd_descale_p##PASS); \
62   out2h = vec_msums(tmp1312h, pw_f130_f054, pd_descale_p##PASS); \
63   out6l = vec_msums(tmp1312l, pw_f054_mf130, pd_descale_p##PASS); \
64   out6h = vec_msums(tmp1312h, pw_f054_mf130, pd_descale_p##PASS); \
65   \
66   out2l = vec_sra(out2l, descale_p##PASS); \
67   out2h = vec_sra(out2h, descale_p##PASS); \
68   out6l = vec_sra(out6l, descale_p##PASS); \
69   out6h = vec_sra(out6h, descale_p##PASS); \
70   \
71   out2 = vec_pack(out2l, out2h); \
72   out6 = vec_pack(out6l, out6h); \
73   \
74   /* Odd part */ \
75   \
76   z3 = vec_add(tmp4, tmp6); \
77   z4 = vec_add(tmp5, tmp7); \
78   \
79   /* (Original) \
80    * z5 = (z3 + z4) * 1.175875602; \
81    * z3 = z3 * -1.961570560;  z4 = z4 * -0.390180644; \
82    * z3 += z5;  z4 += z5; \
83    * \
84    * (This implementation) \
85    * z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602; \
86    * z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644); \
87    */ \
88   \
89   z34l = vec_mergeh(z3, z4); \
90   z34h = vec_mergel(z3, z4); \
91   \
92   z3l = vec_msums(z34l, pw_mf078_f117, pd_descale_p##PASS); \
93   z3h = vec_msums(z34h, pw_mf078_f117, pd_descale_p##PASS); \
94   z4l = vec_msums(z34l, pw_f117_f078, pd_descale_p##PASS); \
95   z4h = vec_msums(z34h, pw_f117_f078, pd_descale_p##PASS); \
96   \
97   /* (Original) \
98    * z1 = tmp4 + tmp7;  z2 = tmp5 + tmp6; \
99    * tmp4 = tmp4 * 0.298631336;  tmp5 = tmp5 * 2.053119869; \
100    * tmp6 = tmp6 * 3.072711026;  tmp7 = tmp7 * 1.501321110; \
101    * z1 = z1 * -0.899976223;  z2 = z2 * -2.562915447; \
102    * data7 = tmp4 + z1 + z3;  data5 = tmp5 + z2 + z4; \
103    * data3 = tmp6 + z2 + z3;  data1 = tmp7 + z1 + z4; \
104    * \
105    * (This implementation) \
106    * tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223; \
107    * tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447; \
108    * tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447); \
109    * tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223); \
110    * data7 = tmp4 + z3;  data5 = tmp5 + z4; \
111    * data3 = tmp6 + z3;  data1 = tmp7 + z4; \
112    */ \
113   \
114   tmp47l = vec_mergeh(tmp4, tmp7); \
115   tmp47h = vec_mergel(tmp4, tmp7); \
116   \
117   out7l = vec_msums(tmp47l, pw_mf060_mf089, z3l); \
118   out7h = vec_msums(tmp47h, pw_mf060_mf089, z3h); \
119   out1l = vec_msums(tmp47l, pw_mf089_f060, z4l); \
120   out1h = vec_msums(tmp47h, pw_mf089_f060, z4h); \
121   \
122   out7l = vec_sra(out7l, descale_p##PASS); \
123   out7h = vec_sra(out7h, descale_p##PASS); \
124   out1l = vec_sra(out1l, descale_p##PASS); \
125   out1h = vec_sra(out1h, descale_p##PASS); \
126   \
127   out7 = vec_pack(out7l, out7h); \
128   out1 = vec_pack(out1l, out1h); \
129   \
130   tmp56l = vec_mergeh(tmp5, tmp6); \
131   tmp56h = vec_mergel(tmp5, tmp6); \
132   \
133   out5l = vec_msums(tmp56l, pw_mf050_mf256, z4l); \
134   out5h = vec_msums(tmp56h, pw_mf050_mf256, z4h); \
135   out3l = vec_msums(tmp56l, pw_mf256_f050, z3l); \
136   out3h = vec_msums(tmp56h, pw_mf256_f050, z3h); \
137   \
138   out5l = vec_sra(out5l, descale_p##PASS); \
139   out5h = vec_sra(out5h, descale_p##PASS); \
140   out3l = vec_sra(out3l, descale_p##PASS); \
141   out3h = vec_sra(out3h, descale_p##PASS); \
142   \
143   out5 = vec_pack(out5l, out5h); \
144   out3 = vec_pack(out3l, out3h); \
145 }
146 
147 #define DO_FDCT_PASS1() { \
148   /* Even part */ \
149   \
150   tmp10 = vec_add(tmp0, tmp3); \
151   tmp13 = vec_sub(tmp0, tmp3); \
152   tmp11 = vec_add(tmp1, tmp2); \
153   tmp12 = vec_sub(tmp1, tmp2); \
154   \
155   out0  = vec_add(tmp10, tmp11); \
156   out0  = vec_sl(out0, pass1_bits); \
157   out4  = vec_sub(tmp10, tmp11); \
158   out4  = vec_sl(out4, pass1_bits); \
159   \
160   DO_FDCT_COMMON(1); \
161 }
162 
163 #define DO_FDCT_PASS2() { \
164   /* Even part */ \
165   \
166   tmp10 = vec_add(tmp0, tmp3); \
167   tmp13 = vec_sub(tmp0, tmp3); \
168   tmp11 = vec_add(tmp1, tmp2); \
169   tmp12 = vec_sub(tmp1, tmp2); \
170   \
171   out0  = vec_add(tmp10, tmp11); \
172   out0  = vec_add(out0, pw_descale_p2x); \
173   out0  = vec_sra(out0, pass1_bits); \
174   out4  = vec_sub(tmp10, tmp11); \
175   out4  = vec_add(out4, pw_descale_p2x); \
176   out4  = vec_sra(out4, pass1_bits); \
177   \
178   DO_FDCT_COMMON(2); \
179 }
180 
181 
jsimd_fdct_islow_altivec(DCTELEM * data)182 void jsimd_fdct_islow_altivec(DCTELEM *data)
183 {
184   __vector short row0, row1, row2, row3, row4, row5, row6, row7,
185     col0, col1, col2, col3, col4, col5, col6, col7,
186     tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp10, tmp11, tmp12, tmp13,
187     tmp47l, tmp47h, tmp56l, tmp56h, tmp1312l, tmp1312h,
188     z3, z4, z34l, z34h,
189     out0, out1, out2, out3, out4, out5, out6, out7;
190   __vector int z3l, z3h, z4l, z4h,
191     out1l, out1h, out2l, out2h, out3l, out3h, out5l, out5h, out6l, out6h,
192     out7l, out7h;
193 
194   /* Constants */
195   __vector short
196     pw_f130_f054 = { __4X2(F_0_541 + F_0_765, F_0_541) },
197     pw_f054_mf130 = { __4X2(F_0_541, F_0_541 - F_1_847) },
198     pw_mf078_f117 = { __4X2(F_1_175 - F_1_961, F_1_175) },
199     pw_f117_f078 = { __4X2(F_1_175, F_1_175 - F_0_390) },
200     pw_mf060_mf089 = { __4X2(F_0_298 - F_0_899, -F_0_899) },
201     pw_mf089_f060 = { __4X2(-F_0_899, F_1_501 - F_0_899) },
202     pw_mf050_mf256 = { __4X2(F_2_053 - F_2_562, -F_2_562) },
203     pw_mf256_f050 = { __4X2(-F_2_562, F_3_072 - F_2_562) },
204     pw_descale_p2x = { __8X(1 << (PASS1_BITS - 1)) };
205   __vector unsigned short pass1_bits = { __8X(PASS1_BITS) };
206   __vector int pd_descale_p1 = { __4X(1 << (DESCALE_P1 - 1)) },
207     pd_descale_p2 = { __4X(1 << (DESCALE_P2 - 1)) };
208   __vector unsigned int descale_p1 = { __4X(DESCALE_P1) },
209     descale_p2 = { __4X(DESCALE_P2) };
210 
211   /* Pass 1: process rows */
212 
213   row0 = vec_ld(0, data);
214   row1 = vec_ld(16, data);
215   row2 = vec_ld(32, data);
216   row3 = vec_ld(48, data);
217   row4 = vec_ld(64, data);
218   row5 = vec_ld(80, data);
219   row6 = vec_ld(96, data);
220   row7 = vec_ld(112, data);
221 
222   TRANSPOSE(row, col);
223 
224   tmp0 = vec_add(col0, col7);
225   tmp7 = vec_sub(col0, col7);
226   tmp1 = vec_add(col1, col6);
227   tmp6 = vec_sub(col1, col6);
228   tmp2 = vec_add(col2, col5);
229   tmp5 = vec_sub(col2, col5);
230   tmp3 = vec_add(col3, col4);
231   tmp4 = vec_sub(col3, col4);
232 
233   DO_FDCT_PASS1();
234 
235   /* Pass 2: process columns */
236 
237   TRANSPOSE(out, row);
238 
239   tmp0 = vec_add(row0, row7);
240   tmp7 = vec_sub(row0, row7);
241   tmp1 = vec_add(row1, row6);
242   tmp6 = vec_sub(row1, row6);
243   tmp2 = vec_add(row2, row5);
244   tmp5 = vec_sub(row2, row5);
245   tmp3 = vec_add(row3, row4);
246   tmp4 = vec_sub(row3, row4);
247 
248   DO_FDCT_PASS2();
249 
250   vec_st(out0, 0, data);
251   vec_st(out1, 16, data);
252   vec_st(out2, 32, data);
253   vec_st(out3, 48, data);
254   vec_st(out4, 64, data);
255   vec_st(out5, 80, data);
256   vec_st(out6, 96, data);
257   vec_st(out7, 112, data);
258 }
259