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1/********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
4 * *
5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * *
9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
11 * *
12 ********************************************************************
13
14 function: arm7 and later wide math functions
15
16 ********************************************************************/
17#ifdef CPU_ARM
18
19#if !defined(_V_WIDE_MATH) && !defined(_LOW_ACCURACY_)
20#define _V_WIDE_MATH
21
22static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
23 int lo,hi;
24 asm volatile("smull\t%0, %1, %2, %3"
25 : "=&r"(lo),"=&r"(hi)
26 : "%r"(x),"r"(y)
27 : "cc");
28 return(hi);
29}
30
31static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
32 return MULT32(x,y)<<1;
33}
34
35static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
36 int lo,hi;
37 asm volatile("smull %0, %1, %2, %3\n\t"
38 "movs %0, %0, lsr #15\n\t"
39 "adc %1, %0, %1, lsl #17\n\t"
40 : "=&r"(lo),"=&r"(hi)
41 : "%r"(x),"r"(y)
42 : "cc");
43 return(hi);
44}
45
46#define MB() asm volatile ("" : : : "memory")
47
48#define XPROD32(a, b, t, v, x, y) \
49{ \
50 long l; \
51 asm( "smull %0, %1, %4, %6\n\t" \
52 "smlal %0, %1, %5, %7\n\t" \
53 "rsb %3, %4, #0\n\t" \
54 "smull %0, %2, %5, %6\n\t" \
55 "smlal %0, %2, %3, %7" \
56 : "=&r" (l), "=&r" (x), "=&r" (y), "=r" ((a)) \
57 : "3" ((a)), "r" ((b)), "r" ((t)), "r" ((v)) \
58 : "cc" ); \
59}
60
61static inline void XPROD31(ogg_int32_t a, ogg_int32_t b,
62 ogg_int32_t t, ogg_int32_t v,
63 ogg_int32_t *x, ogg_int32_t *y)
64{
65 int x1, y1, l;
66 asm( "smull %0, %1, %4, %6\n\t"
67 "smlal %0, %1, %5, %7\n\t"
68 "rsb %3, %4, #0\n\t"
69 "smull %0, %2, %5, %6\n\t"
70 "smlal %0, %2, %3, %7"
71 : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a)
72 : "3" (a), "r" (b), "r" (t), "r" (v)
73 : "cc" );
74 *x = x1 << 1;
75 MB();
76 *y = y1 << 1;
77}
78
79static inline void XNPROD31(ogg_int32_t a, ogg_int32_t b,
80 ogg_int32_t t, ogg_int32_t v,
81 ogg_int32_t *x, ogg_int32_t *y)
82{
83 int x1, y1, l;
84 asm( "rsb %2, %4, #0\n\t"
85 "smull %0, %1, %3, %5\n\t"
86 "smlal %0, %1, %2, %6\n\t"
87 "smull %0, %2, %4, %5\n\t"
88 "smlal %0, %2, %3, %6"
89 : "=&r" (l), "=&r" (x1), "=&r" (y1)
90 : "r" (a), "r" (b), "r" (t), "r" (v)
91 : "cc" );
92 *x = x1 << 1;
93 MB();
94 *y = y1 << 1;
95}
96
97#ifndef _V_VECT_OPS
98#define _V_VECT_OPS
99
100/* asm versions of vector operations for block.c, window.c */
101static inline
102void vect_add(ogg_int32_t *x, ogg_int32_t *y, int n)
103{
104 while (n>=4) {
105 asm volatile ("ldmia %[x], {r0, r1, r2, r3};"
106 "ldmia %[y]!, {r4, r5, r6, r7};"
107 "add r0, r0, r4;"
108 "add r1, r1, r5;"
109 "add r2, r2, r6;"
110 "add r3, r3, r7;"
111 "stmia %[x]!, {r0, r1, r2, r3};"
112 : [x] "+r" (x), [y] "+r" (y)
113 : : "r0", "r1", "r2", "r3",
114 "r4", "r5", "r6", "r7",
115 "memory");
116 n -= 4;
117 }
118 /* add final elements */
119 while (n>0) {
120 *x++ += *y++;
121 n--;
122 }
123}
124
125static inline
126void vect_copy(ogg_int32_t *x, ogg_int32_t *y, int n)
127{
128 while (n>=4) {
129 asm volatile ("ldmia %[y]!, {r0, r1, r2, r3};"
130 "stmia %[x]!, {r0, r1, r2, r3};"
131 : [x] "+r" (x), [y] "+r" (y)
132 : : "r0", "r1", "r2", "r3",
133 "memory");
134 n -= 4;
135 }
136 /* copy final elements */
137 while (n>0) {
138 *x++ = *y++;
139 n--;
140 }
141}
142
143static inline
144void vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
145{
146 while (n>=4) {
147 asm volatile ("ldmia %[d], {r0, r1, r2, r3};"
148 "ldmia %[w]!, {r4, r5, r6, r7};"
149 "smull r8, r9, r0, r4;"
150 "mov r0, r9, lsl #1;"
151 "smull r8, r9, r1, r5;"
152 "mov r1, r9, lsl #1;"
153 "smull r8, r9, r2, r6;"
154 "mov r2, r9, lsl #1;"
155 "smull r8, r9, r3, r7;"
156 "mov r3, r9, lsl #1;"
157 "stmia %[d]!, {r0, r1, r2, r3};"
158 : [d] "+r" (data), [w] "+r" (window)
159 : : "r0", "r1", "r2", "r3",
160 "r4", "r5", "r6", "r7", "r8", "r9",
161 "memory", "cc");
162 n -= 4;
163 }
164 while(n>0) {
165 *data = MULT31(*data, *window);
166 data++;
167 window++;
168 n--;
169 }
170}
171
172static inline
173void vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
174{
175 while (n>=4) {
176 asm volatile ("ldmia %[d], {r0, r1, r2, r3};"
177 "ldmda %[w]!, {r4, r5, r6, r7};"
178 "smull r8, r9, r0, r7;"
179 "mov r0, r9, lsl #1;"
180 "smull r8, r9, r1, r6;"
181 "mov r1, r9, lsl #1;"
182 "smull r8, r9, r2, r5;"
183 "mov r2, r9, lsl #1;"
184 "smull r8, r9, r3, r4;"
185 "mov r3, r9, lsl #1;"
186 "stmia %[d]!, {r0, r1, r2, r3};"
187 : [d] "+r" (data), [w] "+r" (window)
188 : : "r0", "r1", "r2", "r3",
189 "r4", "r5", "r6", "r7", "r8", "r9",
190 "memory", "cc");
191 n -= 4;
192 }
193 while(n>0) {
194 *data = MULT31(*data, *window);
195 data++;
196 window--;
197 n--;
198 }
199}
200
201#endif
202
203#endif
204
205#ifndef _V_CLIP_MATH
206#define _V_CLIP_MATH
207
208static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) {
209 int tmp;
210 asm volatile("subs %1, %0, #32768\n\t"
211 "movpl %0, #0x7f00\n\t"
212 "orrpl %0, %0, #0xff\n"
213 "adds %1, %0, #32768\n\t"
214 "movmi %0, #0x8000"
215 : "+r"(x),"=r"(tmp)
216 :
217 : "cc");
218 return(x);
219}
220
221#endif
222
223#ifndef _V_LSP_MATH_ASM
224#define _V_LSP_MATH_ASM
225
226static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip,
227 ogg_int32_t *qexpp,
228 ogg_int32_t *ilsp,ogg_int32_t wi,
229 ogg_int32_t m){
230
231 ogg_uint32_t qi=*qip,pi=*pip;
232 ogg_int32_t qexp=*qexpp;
233
234 asm("mov r0,%3;"
235 "mov r1,%5,asr#1;"
236 "add r0,r0,r1,lsl#3;"
237 "1:"
238
239 "ldmdb r0!,{r1,r3};"
240 "subs r1,r1,%4;" //ilsp[j]-wi
241 "rsbmi r1,r1,#0;" //labs(ilsp[j]-wi)
242 "umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi)
243
244 "subs r1,r3,%4;" //ilsp[j+1]-wi
245 "rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi)
246 "umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi)
247
248 "cmn r2,r3;" // shift down 16?
249 "beq 0f;"
250 "add %2,%2,#16;"
251 "mov %0,%0,lsr #16;"
252 "orr %0,%0,r2,lsl #16;"
253 "mov %1,%1,lsr #16;"
254 "orr %1,%1,r3,lsl #16;"
255 "0:"
256 "cmp r0,%3;\n"
257 "bhi 1b;\n"
258
259 // odd filter assymetry
260 "ands r0,%5,#1;\n"
261 "beq 2f;\n"
262 "add r0,%3,%5,lsl#2;\n"
263
264 "ldr r1,[r0,#-4];\n"
265 "mov r0,#0x4000;\n"
266
267 "subs r1,r1,%4;\n" //ilsp[j]-wi
268 "rsbmi r1,r1,#0;\n" //labs(ilsp[j]-wi)
269 "umull %0,r2,r1,%0;\n" //qi*=labs(ilsp[j]-wi)
270 "umull %1,r3,r0,%1;\n" //pi*=labs(ilsp[j+1]-wi)
271
272 "cmn r2,r3;\n" // shift down 16?
273 "beq 2f;\n"
274 "add %2,%2,#16;\n"
275 "mov %0,%0,lsr #16;\n"
276 "orr %0,%0,r2,lsl #16;\n"
277 "mov %1,%1,lsr #16;\n"
278 "orr %1,%1,r3,lsl #16;\n"
279
280 //qi=(pi>>shift)*labs(ilsp[j]-wi);
281 //pi=(qi>>shift)*labs(ilsp[j+1]-wi);
282 //qexp+=shift;
283
284 //}
285
286 /* normalize to max 16 sig figs */
287 "2:"
288 "mov r2,#0;"
289 "orr r1,%0,%1;"
290 "tst r1,#0xff000000;"
291 "addne r2,r2,#8;"
292 "movne r1,r1,lsr #8;"
293 "tst r1,#0x00f00000;"
294 "addne r2,r2,#4;"
295 "movne r1,r1,lsr #4;"
296 "tst r1,#0x000c0000;"
297 "addne r2,r2,#2;"
298 "movne r1,r1,lsr #2;"
299 "tst r1,#0x00020000;"
300 "addne r2,r2,#1;"
301 "movne r1,r1,lsr #1;"
302 "tst r1,#0x00010000;"
303 "addne r2,r2,#1;"
304 "mov %0,%0,lsr r2;"
305 "mov %1,%1,lsr r2;"
306 "add %2,%2,r2;"
307
308 : "+r"(qi),"+r"(pi),"+r"(qexp)
309 : "r"(ilsp),"r"(wi),"r"(m)
310 : "r0","r1","r2","r3","cc");
311
312 *qip=qi;
313 *pip=pi;
314 *qexpp=qexp;
315}
316
317static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){
318
319 ogg_uint32_t qi=*qip;
320 ogg_int32_t qexp=*qexpp;
321
322 asm("tst %0,#0x0000ff00;"
323 "moveq %0,%0,lsl #8;"
324 "subeq %1,%1,#8;"
325 "tst %0,#0x0000f000;"
326 "moveq %0,%0,lsl #4;"
327 "subeq %1,%1,#4;"
328 "tst %0,#0x0000c000;"
329 "moveq %0,%0,lsl #2;"
330 "subeq %1,%1,#2;"
331 "tst %0,#0x00008000;"
332 "moveq %0,%0,lsl #1;"
333 "subeq %1,%1,#1;"
334 : "+r"(qi),"+r"(qexp)
335 :
336 : "cc");
337 *qip=qi;
338 *qexpp=qexp;
339}
340
341#endif
342#endif
343
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