1 // Copyright 2014 Google Inc. All Rights Reserved.
2 //
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the COPYING file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
8 // -----------------------------------------------------------------------------
9 //
10 // MIPS version of rescaling functions
11 //
12 // Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
13
14 #include "./dsp.h"
15
16 #if defined(WEBP_USE_MIPS32)
17
18 #include <assert.h>
19 #include "../utils/rescaler_utils.h"
20
21 //------------------------------------------------------------------------------
22 // Row import
23
ImportRowShrink(WebPRescaler * const wrk,const uint8_t * src)24 static void ImportRowShrink(WebPRescaler* const wrk, const uint8_t* src) {
25 const int x_stride = wrk->num_channels;
26 const int x_out_max = wrk->dst_width * wrk->num_channels;
27 const int fx_scale = wrk->fx_scale;
28 const int x_add = wrk->x_add;
29 const int x_sub = wrk->x_sub;
30 const int x_stride1 = x_stride << 2;
31 int channel;
32 assert(!wrk->x_expand);
33 assert(!WebPRescalerInputDone(wrk));
34
35 for (channel = 0; channel < x_stride; ++channel) {
36 const uint8_t* src1 = src + channel;
37 rescaler_t* frow = wrk->frow + channel;
38 int temp1, temp2, temp3;
39 int base, frac, sum;
40 int accum, accum1;
41 int loop_c = x_out_max - channel;
42
43 __asm__ volatile (
44 "li %[temp1], 0x8000 \n\t"
45 "li %[temp2], 0x10000 \n\t"
46 "li %[sum], 0 \n\t"
47 "li %[accum], 0 \n\t"
48 "1: \n\t"
49 "addu %[accum], %[accum], %[x_add] \n\t"
50 "li %[base], 0 \n\t"
51 "blez %[accum], 3f \n\t"
52 "2: \n\t"
53 "lbu %[base], 0(%[src1]) \n\t"
54 "subu %[accum], %[accum], %[x_sub] \n\t"
55 "addu %[src1], %[src1], %[x_stride] \n\t"
56 "addu %[sum], %[sum], %[base] \n\t"
57 "bgtz %[accum], 2b \n\t"
58 "3: \n\t"
59 "negu %[accum1], %[accum] \n\t"
60 "mul %[frac], %[base], %[accum1] \n\t"
61 "mul %[temp3], %[sum], %[x_sub] \n\t"
62 "subu %[loop_c], %[loop_c], %[x_stride] \n\t"
63 "mult %[temp1], %[temp2] \n\t"
64 "maddu %[frac], %[fx_scale] \n\t"
65 "mfhi %[sum] \n\t"
66 "subu %[temp3], %[temp3], %[frac] \n\t"
67 "sw %[temp3], 0(%[frow]) \n\t"
68 "addu %[frow], %[frow], %[x_stride1] \n\t"
69 "bgtz %[loop_c], 1b \n\t"
70 : [accum]"=&r"(accum), [src1]"+r"(src1), [temp3]"=&r"(temp3),
71 [sum]"=&r"(sum), [base]"=&r"(base), [frac]"=&r"(frac),
72 [frow]"+r"(frow), [accum1]"=&r"(accum1),
73 [temp2]"=&r"(temp2), [temp1]"=&r"(temp1)
74 : [x_stride]"r"(x_stride), [fx_scale]"r"(fx_scale),
75 [x_sub]"r"(x_sub), [x_add]"r"(x_add),
76 [loop_c]"r"(loop_c), [x_stride1]"r"(x_stride1)
77 : "memory", "hi", "lo"
78 );
79 assert(accum == 0);
80 }
81 }
82
ImportRowExpand(WebPRescaler * const wrk,const uint8_t * src)83 static void ImportRowExpand(WebPRescaler* const wrk, const uint8_t* src) {
84 const int x_stride = wrk->num_channels;
85 const int x_out_max = wrk->dst_width * wrk->num_channels;
86 const int x_add = wrk->x_add;
87 const int x_sub = wrk->x_sub;
88 const int src_width = wrk->src_width;
89 const int x_stride1 = x_stride << 2;
90 int channel;
91 assert(wrk->x_expand);
92 assert(!WebPRescalerInputDone(wrk));
93
94 for (channel = 0; channel < x_stride; ++channel) {
95 const uint8_t* src1 = src + channel;
96 rescaler_t* frow = wrk->frow + channel;
97 int temp1, temp2, temp3, temp4;
98 int frac;
99 int accum;
100 int x_out = channel;
101
102 __asm__ volatile (
103 "addiu %[temp3], %[src_width], -1 \n\t"
104 "lbu %[temp2], 0(%[src1]) \n\t"
105 "addu %[src1], %[src1], %[x_stride] \n\t"
106 "bgtz %[temp3], 0f \n\t"
107 "addiu %[temp1], %[temp2], 0 \n\t"
108 "b 3f \n\t"
109 "0: \n\t"
110 "lbu %[temp1], 0(%[src1]) \n\t"
111 "3: \n\t"
112 "addiu %[accum], %[x_add], 0 \n\t"
113 "1: \n\t"
114 "subu %[temp3], %[temp2], %[temp1] \n\t"
115 "mul %[temp3], %[temp3], %[accum] \n\t"
116 "mul %[temp4], %[temp1], %[x_add] \n\t"
117 "addu %[temp3], %[temp4], %[temp3] \n\t"
118 "sw %[temp3], 0(%[frow]) \n\t"
119 "addu %[frow], %[frow], %[x_stride1] \n\t"
120 "addu %[x_out], %[x_out], %[x_stride] \n\t"
121 "subu %[temp3], %[x_out], %[x_out_max] \n\t"
122 "bgez %[temp3], 2f \n\t"
123 "subu %[accum], %[accum], %[x_sub] \n\t"
124 "bgez %[accum], 4f \n\t"
125 "addiu %[temp2], %[temp1], 0 \n\t"
126 "addu %[src1], %[src1], %[x_stride] \n\t"
127 "lbu %[temp1], 0(%[src1]) \n\t"
128 "addu %[accum], %[accum], %[x_add] \n\t"
129 "4: \n\t"
130 "b 1b \n\t"
131 "2: \n\t"
132 : [src1]"+r"(src1), [accum]"=&r"(accum), [temp1]"=&r"(temp1),
133 [temp2]"=&r"(temp2), [temp3]"=&r"(temp3), [temp4]"=&r"(temp4),
134 [x_out]"+r"(x_out), [frac]"=&r"(frac), [frow]"+r"(frow)
135 : [x_stride]"r"(x_stride), [x_add]"r"(x_add), [x_sub]"r"(x_sub),
136 [x_stride1]"r"(x_stride1), [src_width]"r"(src_width),
137 [x_out_max]"r"(x_out_max)
138 : "memory", "hi", "lo"
139 );
140 assert(wrk->x_sub == 0 /* <- special case for src_width=1 */ || accum == 0);
141 }
142 }
143
144 //------------------------------------------------------------------------------
145 // Row export
146
ExportRowExpand(WebPRescaler * const wrk)147 static void ExportRowExpand(WebPRescaler* const wrk) {
148 uint8_t* dst = wrk->dst;
149 rescaler_t* irow = wrk->irow;
150 const int x_out_max = wrk->dst_width * wrk->num_channels;
151 const rescaler_t* frow = wrk->frow;
152 int temp0, temp1, temp3, temp4, temp5, loop_end;
153 const int temp2 = (int)wrk->fy_scale;
154 const int temp6 = x_out_max << 2;
155 assert(!WebPRescalerOutputDone(wrk));
156 assert(wrk->y_accum <= 0);
157 assert(wrk->y_expand);
158 assert(wrk->y_sub != 0);
159 if (wrk->y_accum == 0) {
160 __asm__ volatile (
161 "li %[temp3], 0x10000 \n\t"
162 "li %[temp4], 0x8000 \n\t"
163 "addu %[loop_end], %[frow], %[temp6] \n\t"
164 "1: \n\t"
165 "lw %[temp0], 0(%[frow]) \n\t"
166 "addiu %[dst], %[dst], 1 \n\t"
167 "addiu %[frow], %[frow], 4 \n\t"
168 "mult %[temp3], %[temp4] \n\t"
169 "maddu %[temp0], %[temp2] \n\t"
170 "mfhi %[temp5] \n\t"
171 "sb %[temp5], -1(%[dst]) \n\t"
172 "bne %[frow], %[loop_end], 1b \n\t"
173 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
174 [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
175 [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
176 : [temp2]"r"(temp2), [temp6]"r"(temp6)
177 : "memory", "hi", "lo"
178 );
179 } else {
180 const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
181 const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
182 __asm__ volatile (
183 "li %[temp3], 0x10000 \n\t"
184 "li %[temp4], 0x8000 \n\t"
185 "addu %[loop_end], %[frow], %[temp6] \n\t"
186 "1: \n\t"
187 "lw %[temp0], 0(%[frow]) \n\t"
188 "lw %[temp1], 0(%[irow]) \n\t"
189 "addiu %[dst], %[dst], 1 \n\t"
190 "mult %[temp3], %[temp4] \n\t"
191 "maddu %[A], %[temp0] \n\t"
192 "maddu %[B], %[temp1] \n\t"
193 "addiu %[frow], %[frow], 4 \n\t"
194 "addiu %[irow], %[irow], 4 \n\t"
195 "mfhi %[temp5] \n\t"
196 "mult %[temp3], %[temp4] \n\t"
197 "maddu %[temp5], %[temp2] \n\t"
198 "mfhi %[temp5] \n\t"
199 "sb %[temp5], -1(%[dst]) \n\t"
200 "bne %[frow], %[loop_end], 1b \n\t"
201 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
202 [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
203 [irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
204 : [temp2]"r"(temp2), [temp6]"r"(temp6), [A]"r"(A), [B]"r"(B)
205 : "memory", "hi", "lo"
206 );
207 }
208 }
209
ExportRowShrink(WebPRescaler * const wrk)210 static void ExportRowShrink(WebPRescaler* const wrk) {
211 const int x_out_max = wrk->dst_width * wrk->num_channels;
212 uint8_t* dst = wrk->dst;
213 rescaler_t* irow = wrk->irow;
214 const rescaler_t* frow = wrk->frow;
215 const int yscale = wrk->fy_scale * (-wrk->y_accum);
216 int temp0, temp1, temp3, temp4, temp5, loop_end;
217 const int temp2 = (int)wrk->fxy_scale;
218 const int temp6 = x_out_max << 2;
219
220 assert(!WebPRescalerOutputDone(wrk));
221 assert(wrk->y_accum <= 0);
222 assert(!wrk->y_expand);
223 assert(wrk->fxy_scale != 0);
224 if (yscale) {
225 __asm__ volatile (
226 "li %[temp3], 0x10000 \n\t"
227 "li %[temp4], 0x8000 \n\t"
228 "addu %[loop_end], %[frow], %[temp6] \n\t"
229 "1: \n\t"
230 "lw %[temp0], 0(%[frow]) \n\t"
231 "mult %[temp3], %[temp4] \n\t"
232 "addiu %[frow], %[frow], 4 \n\t"
233 "maddu %[temp0], %[yscale] \n\t"
234 "mfhi %[temp1] \n\t"
235 "lw %[temp0], 0(%[irow]) \n\t"
236 "addiu %[dst], %[dst], 1 \n\t"
237 "addiu %[irow], %[irow], 4 \n\t"
238 "subu %[temp0], %[temp0], %[temp1] \n\t"
239 "mult %[temp3], %[temp4] \n\t"
240 "maddu %[temp0], %[temp2] \n\t"
241 "mfhi %[temp5] \n\t"
242 "sw %[temp1], -4(%[irow]) \n\t"
243 "sb %[temp5], -1(%[dst]) \n\t"
244 "bne %[frow], %[loop_end], 1b \n\t"
245 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
246 [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
247 [irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
248 : [temp2]"r"(temp2), [yscale]"r"(yscale), [temp6]"r"(temp6)
249 : "memory", "hi", "lo"
250 );
251 } else {
252 __asm__ volatile (
253 "li %[temp3], 0x10000 \n\t"
254 "li %[temp4], 0x8000 \n\t"
255 "addu %[loop_end], %[irow], %[temp6] \n\t"
256 "1: \n\t"
257 "lw %[temp0], 0(%[irow]) \n\t"
258 "addiu %[dst], %[dst], 1 \n\t"
259 "addiu %[irow], %[irow], 4 \n\t"
260 "mult %[temp3], %[temp4] \n\t"
261 "maddu %[temp0], %[temp2] \n\t"
262 "mfhi %[temp5] \n\t"
263 "sw $zero, -4(%[irow]) \n\t"
264 "sb %[temp5], -1(%[dst]) \n\t"
265 "bne %[irow], %[loop_end], 1b \n\t"
266 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
267 [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [irow]"+r"(irow),
268 [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
269 : [temp2]"r"(temp2), [temp6]"r"(temp6)
270 : "memory", "hi", "lo"
271 );
272 }
273 }
274
275 //------------------------------------------------------------------------------
276 // Entry point
277
278 extern void WebPRescalerDspInitMIPS32(void);
279
WebPRescalerDspInitMIPS32(void)280 WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPS32(void) {
281 WebPRescalerImportRowExpand = ImportRowExpand;
282 WebPRescalerImportRowShrink = ImportRowShrink;
283 WebPRescalerExportRowExpand = ExportRowExpand;
284 WebPRescalerExportRowShrink = ExportRowShrink;
285 }
286
287 #else // !WEBP_USE_MIPS32
288
289 WEBP_DSP_INIT_STUB(WebPRescalerDspInitMIPS32)
290
291 #endif // WEBP_USE_MIPS32
292