Gloria Wang | 0f6f252 | 2010-02-04 13:58:20 -0800 | [diff] [blame^] | 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 | |
| 18 | #ifdef _ARM_ASSEM_ |
| 19 | |
| 20 | #if !defined(_V_WIDE_MATH) && !defined(_LOW_ACCURACY_) |
| 21 | #define _V_WIDE_MATH |
| 22 | |
| 23 | static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) { |
| 24 | int lo,hi; |
| 25 | asm volatile("smull\t%0, %1, %2, %3" |
| 26 | : "=&r"(lo),"=&r"(hi) |
| 27 | : "%r"(x),"r"(y) |
| 28 | : "cc"); |
| 29 | return(hi); |
| 30 | } |
| 31 | |
| 32 | static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) { |
| 33 | return MULT32(x,y)<<1; |
| 34 | } |
| 35 | |
| 36 | static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) { |
| 37 | int lo,hi; |
| 38 | asm volatile("smull %0, %1, %2, %3\n\t" |
| 39 | "movs %0, %0, lsr #15\n\t" |
| 40 | "adc %1, %0, %1, lsl #17\n\t" |
| 41 | : "=&r"(lo),"=&r"(hi) |
| 42 | : "%r"(x),"r"(y) |
| 43 | : "cc"); |
| 44 | return(hi); |
| 45 | } |
| 46 | |
| 47 | #define MB() asm volatile ("" : : : "memory") |
| 48 | |
| 49 | static inline void XPROD32(ogg_int32_t a, ogg_int32_t b, |
| 50 | ogg_int32_t t, ogg_int32_t v, |
| 51 | ogg_int32_t *x, ogg_int32_t *y) |
| 52 | { |
| 53 | int x1, y1, l; |
| 54 | asm( "smull %0, %1, %4, %6\n\t" |
| 55 | "smlal %0, %1, %5, %7\n\t" |
| 56 | "rsb %3, %4, #0\n\t" |
| 57 | "smull %0, %2, %5, %6\n\t" |
| 58 | "smlal %0, %2, %3, %7" |
| 59 | : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a) |
| 60 | : "3" (a), "r" (b), "r" (t), "r" (v) |
| 61 | : "cc" ); |
| 62 | *x = x1; |
| 63 | MB(); |
| 64 | *y = y1; |
| 65 | } |
| 66 | |
| 67 | /* x = (a*t + b*v)>>31, y = (b*t - a*v)>>31 */ |
| 68 | static inline void XPROD31(ogg_int32_t a, ogg_int32_t b, |
| 69 | ogg_int32_t t, ogg_int32_t v, |
| 70 | ogg_int32_t *x, ogg_int32_t *y) |
| 71 | { |
| 72 | int x1, y1, l; |
| 73 | asm( "smull %0, %1, %4, %6\n\t" |
| 74 | "smlal %0, %1, %5, %7\n\t" |
| 75 | "rsb %3, %4, #0\n\t" |
| 76 | "smull %0, %2, %5, %6\n\t" |
| 77 | "smlal %0, %2, %3, %7" |
| 78 | : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a) |
| 79 | : "3" (a), "r" (b), "r" (t), "r" (v) |
| 80 | : "cc" ); |
| 81 | *x = x1 << 1; |
| 82 | MB(); |
| 83 | *y = y1 << 1; |
| 84 | } |
| 85 | |
| 86 | /* x = (a*t - b*v)>>31, y = (b*t + a*v)>>31 */ |
| 87 | static inline void XNPROD31(ogg_int32_t a, ogg_int32_t b, |
| 88 | ogg_int32_t t, ogg_int32_t v, |
| 89 | ogg_int32_t *x, ogg_int32_t *y) |
| 90 | { |
| 91 | int x1, y1, l; |
| 92 | asm( "rsb %2, %4, #0\n\t" |
| 93 | "smull %0, %1, %3, %5\n\t" |
| 94 | "smlal %0, %1, %2, %6\n\t" |
| 95 | "smull %0, %2, %4, %5\n\t" |
| 96 | "smlal %0, %2, %3, %6" |
| 97 | : "=&r" (l), "=&r" (x1), "=&r" (y1) |
| 98 | : "r" (a), "r" (b), "r" (t), "r" (v) |
| 99 | : "cc" ); |
| 100 | *x = x1 << 1; |
| 101 | MB(); |
| 102 | *y = y1 << 1; |
| 103 | } |
| 104 | |
| 105 | #endif |
| 106 | |
| 107 | #ifndef _V_CLIP_MATH |
| 108 | #define _V_CLIP_MATH |
| 109 | |
| 110 | static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) { |
| 111 | int tmp; |
| 112 | asm volatile("subs %1, %0, #32768\n\t" |
| 113 | "movpl %0, #0x7f00\n\t" |
| 114 | "orrpl %0, %0, #0xff\n" |
| 115 | "adds %1, %0, #32768\n\t" |
| 116 | "movmi %0, #0x8000" |
| 117 | : "+r"(x),"=r"(tmp) |
| 118 | : |
| 119 | : "cc"); |
| 120 | return(x); |
| 121 | } |
| 122 | |
| 123 | #endif |
| 124 | |
| 125 | #ifndef _V_LSP_MATH_ASM |
| 126 | #define _V_LSP_MATH_ASM |
| 127 | |
| 128 | static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip, |
| 129 | ogg_int32_t *qexpp, |
| 130 | ogg_int32_t *ilsp,ogg_int32_t wi, |
| 131 | ogg_int32_t m){ |
| 132 | |
| 133 | ogg_uint32_t qi=*qip,pi=*pip; |
| 134 | ogg_int32_t qexp=*qexpp; |
| 135 | |
| 136 | asm("mov r0,%3;" |
| 137 | "mov r1,%5,asr#1;" |
| 138 | "add r0,r0,r1,lsl#3;" |
| 139 | "1:" |
| 140 | |
| 141 | "ldmdb r0!,{r1,r3};" |
| 142 | "subs r1,r1,%4;" //ilsp[j]-wi |
| 143 | "rsbmi r1,r1,#0;" //labs(ilsp[j]-wi) |
| 144 | "umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi) |
| 145 | |
| 146 | "subs r1,r3,%4;" //ilsp[j+1]-wi |
| 147 | "rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi) |
| 148 | "umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi) |
| 149 | |
| 150 | "cmn r2,r3;" // shift down 16? |
| 151 | "beq 0f;" |
| 152 | "add %2,%2,#16;" |
| 153 | "mov %0,%0,lsr #16;" |
| 154 | "orr %0,%0,r2,lsl #16;" |
| 155 | "mov %1,%1,lsr #16;" |
| 156 | "orr %1,%1,r3,lsl #16;" |
| 157 | "0:" |
| 158 | "cmp r0,%3;\n" |
| 159 | "bhi 1b;\n" |
| 160 | |
| 161 | // odd filter assymetry |
| 162 | "ands r0,%5,#1;\n" |
| 163 | "beq 2f;\n" |
| 164 | "add r0,%3,%5,lsl#2;\n" |
| 165 | |
| 166 | "ldr r1,[r0,#-4];\n" |
| 167 | "mov r0,#0x4000;\n" |
| 168 | |
| 169 | "subs r1,r1,%4;\n" //ilsp[j]-wi |
| 170 | "rsbmi r1,r1,#0;\n" //labs(ilsp[j]-wi) |
| 171 | "umull %0,r2,r1,%0;\n" //qi*=labs(ilsp[j]-wi) |
| 172 | "umull %1,r3,r0,%1;\n" //pi*=labs(ilsp[j+1]-wi) |
| 173 | |
| 174 | "cmn r2,r3;\n" // shift down 16? |
| 175 | "beq 2f;\n" |
| 176 | "add %2,%2,#16;\n" |
| 177 | "mov %0,%0,lsr #16;\n" |
| 178 | "orr %0,%0,r2,lsl #16;\n" |
| 179 | "mov %1,%1,lsr #16;\n" |
| 180 | "orr %1,%1,r3,lsl #16;\n" |
| 181 | |
| 182 | //qi=(pi>>shift)*labs(ilsp[j]-wi); |
| 183 | //pi=(qi>>shift)*labs(ilsp[j+1]-wi); |
| 184 | //qexp+=shift; |
| 185 | |
| 186 | //} |
| 187 | |
| 188 | /* normalize to max 16 sig figs */ |
| 189 | "2:" |
| 190 | "mov r2,#0;" |
| 191 | "orr r1,%0,%1;" |
| 192 | "tst r1,#0xff000000;" |
| 193 | "addne r2,r2,#8;" |
| 194 | "movne r1,r1,lsr #8;" |
| 195 | "tst r1,#0x00f00000;" |
| 196 | "addne r2,r2,#4;" |
| 197 | "movne r1,r1,lsr #4;" |
| 198 | "tst r1,#0x000c0000;" |
| 199 | "addne r2,r2,#2;" |
| 200 | "movne r1,r1,lsr #2;" |
| 201 | "tst r1,#0x00020000;" |
| 202 | "addne r2,r2,#1;" |
| 203 | "movne r1,r1,lsr #1;" |
| 204 | "tst r1,#0x00010000;" |
| 205 | "addne r2,r2,#1;" |
| 206 | "mov %0,%0,lsr r2;" |
| 207 | "mov %1,%1,lsr r2;" |
| 208 | "add %2,%2,r2;" |
| 209 | |
| 210 | : "+r"(qi),"+r"(pi),"+r"(qexp) |
| 211 | : "r"(ilsp),"r"(wi),"r"(m) |
| 212 | : "r0","r1","r2","r3","cc"); |
| 213 | |
| 214 | *qip=qi; |
| 215 | *pip=pi; |
| 216 | *qexpp=qexp; |
| 217 | } |
| 218 | |
| 219 | static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){ |
| 220 | |
| 221 | ogg_uint32_t qi=*qip; |
| 222 | ogg_int32_t qexp=*qexpp; |
| 223 | |
| 224 | asm("tst %0,#0x0000ff00;" |
| 225 | "moveq %0,%0,lsl #8;" |
| 226 | "subeq %1,%1,#8;" |
| 227 | "tst %0,#0x0000f000;" |
| 228 | "moveq %0,%0,lsl #4;" |
| 229 | "subeq %1,%1,#4;" |
| 230 | "tst %0,#0x0000c000;" |
| 231 | "moveq %0,%0,lsl #2;" |
| 232 | "subeq %1,%1,#2;" |
| 233 | "tst %0,#0x00008000;" |
| 234 | "moveq %0,%0,lsl #1;" |
| 235 | "subeq %1,%1,#1;" |
| 236 | : "+r"(qi),"+r"(qexp) |
| 237 | : |
| 238 | : "cc"); |
| 239 | *qip=qi; |
| 240 | *qexpp=qexp; |
| 241 | } |
| 242 | |
| 243 | #endif |
| 244 | #endif |
| 245 | |