tremor/asm_arm.h

   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 static inline void XPROD31(ogg_int32_t  a, ogg_int32_t  b,
  68                            ogg_int32_t  t, ogg_int32_t  v,
  69                            ogg_int32_t *x, ogg_int32_t *y)
  70 {
  71   int x1, y1, l;
  72   asm(  "smull  %0, %1, %4, %6\n\t"
  73         "smlal  %0, %1, %5, %7\n\t"
  74         "rsb    %3, %4, #0\n\t"
  75         "smull  %0, %2, %5, %6\n\t"
  76         "smlal  %0, %2, %3, %7"
  77         : "=&r" (l), "=&r" (x1), "=&r" (y1), "=r" (a)
  78         : "3" (a), "r" (b), "r" (t), "r" (v)
  79         : "cc" );
  80   *x = x1 << 1;
  81   MB();
  82   *y = y1 << 1;
  83 }
  84
  85 static inline void XNPROD31(ogg_int32_t  a, ogg_int32_t  b,
  86                             ogg_int32_t  t, ogg_int32_t  v,
  87                             ogg_int32_t *x, ogg_int32_t *y)
  88 {
  89   int x1, y1, l;
  90   asm(  "rsb    %2, %4, #0\n\t"
  91         "smull  %0, %1, %3, %5\n\t"
  92         "smlal  %0, %1, %2, %6\n\t"
  93         "smull  %0, %2, %4, %5\n\t"
  94         "smlal  %0, %2, %3, %6"
  95         : "=&r" (l), "=&r" (x1), "=&r" (y1)
  96         : "r" (a), "r" (b), "r" (t), "r" (v)
  97         : "cc" );
  98   *x = x1 << 1;
  99   MB();
 100   *y = y1 << 1;
 101 }
 102
 103 #endif
 104
 105 #ifndef _V_CLIP_MATH
 106 #define _V_CLIP_MATH
 107
 108 static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) {
 109   int tmp;
 110   asm volatile("subs    %1, %0, #32768\n\t"
 111                "movpl   %0, #0x7f00\n\t"
 112                "orrpl   %0, %0, #0xff\n"
 113                "adds    %1, %0, #32768\n\t"
 114                "movmi   %0, #0x8000"
 115                : "+r"(x),"=r"(tmp)
 116                :
 117                : "cc");
 118   return(x);
 119 }
 120
 121 #endif
 122
 123 #ifndef _V_LSP_MATH_ASM
 124 #define _V_LSP_MATH_ASM
 125
 126 static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip,
 127                                 ogg_int32_t *qexpp,
 128                                 ogg_int32_t *ilsp,ogg_int32_t wi,
 129                                 ogg_int32_t m){
 130
 131   ogg_uint32_t qi=*qip,pi=*pip;
 132   ogg_int32_t qexp=*qexpp;
 133
 134   asm("mov     r0,%3;"
 135       "mov     r1,%5,asr#1;"
 136       "add     r0,r0,r1,lsl#3;"
 137       "1:"
 138
 139       "ldmdb   r0!,{r1,r3};"
 140       "subs    r1,r1,%4;"          //ilsp[j]-wi
 141       "rsbmi   r1,r1,#0;"          //labs(ilsp[j]-wi)
 142       "umull   %0,r2,r1,%0;"       //qi*=labs(ilsp[j]-wi)
 143
 144       "subs    r1,r3,%4;"          //ilsp[j+1]-wi
 145       "rsbmi   r1,r1,#0;"          //labs(ilsp[j+1]-wi)
 146       "umull   %1,r3,r1,%1;"       //pi*=labs(ilsp[j+1]-wi)
 147
 148       "cmn     r2,r3;"             // shift down 16?
 149       "beq     0f;"
 150       "add     %2,%2,#16;"
 151       "mov     %0,%0,lsr #16;"
 152       "orr     %0,%0,r2,lsl #16;"
 153       "mov     %1,%1,lsr #16;"
 154       "orr     %1,%1,r3,lsl #16;"
 155       "0:"
 156       "cmp     r0,%3;\n"
 157       "bhi     1b;\n"
 158
 159       // odd filter assymetry
 160       "ands    r0,%5,#1;\n"
 161       "beq     2f;\n"
 162       "add     r0,%3,%5,lsl#2;\n"
 163
 164       "ldr     r1,[r0,#-4];\n"
 165       "mov     r0,#0x4000;\n"
 166
 167       "subs    r1,r1,%4;\n"          //ilsp[j]-wi
 168       "rsbmi   r1,r1,#0;\n"          //labs(ilsp[j]-wi)
 169       "umull   %0,r2,r1,%0;\n"       //qi*=labs(ilsp[j]-wi)
 170       "umull   %1,r3,r0,%1;\n"       //pi*=labs(ilsp[j+1]-wi)
 171
 172       "cmn     r2,r3;\n"             // shift down 16?
 173       "beq     2f;\n"
 174       "add     %2,%2,#16;\n"
 175       "mov     %0,%0,lsr #16;\n"
 176       "orr     %0,%0,r2,lsl #16;\n"
 177       "mov     %1,%1,lsr #16;\n"
 178       "orr     %1,%1,r3,lsl #16;\n"
 179
 180       //qi=(pi>>shift)*labs(ilsp[j]-wi);
 181       //pi=(qi>>shift)*labs(ilsp[j+1]-wi);
 182       //qexp+=shift;
 183
 184       //}
 185
 186       /* normalize to max 16 sig figs */
 187       "2:"
 188       "mov     r2,#0;"
 189       "orr     r1,%0,%1;"
 190       "tst     r1,#0xff000000;"
 191       "addne   r2,r2,#8;"
 192       "movne   r1,r1,lsr #8;"
 193       "tst     r1,#0x00f00000;"
 194       "addne   r2,r2,#4;"
 195       "movne   r1,r1,lsr #4;"
 196       "tst     r1,#0x000c0000;"
 197       "addne   r2,r2,#2;"
 198       "movne   r1,r1,lsr #2;"
 199       "tst     r1,#0x00020000;"
 200       "addne   r2,r2,#1;"
 201       "movne   r1,r1,lsr #1;"
 202       "tst     r1,#0x00010000;"
 203       "addne   r2,r2,#1;"
 204       "mov     %0,%0,lsr r2;"
 205       "mov     %1,%1,lsr r2;"
 206       "add     %2,%2,r2;"
 207
 208       : "+r"(qi),"+r"(pi),"+r"(qexp)
 209       : "r"(ilsp),"r"(wi),"r"(m)
 210       : "r0","r1","r2","r3","cc");
 211
 212   *qip=qi;
 213   *pip=pi;
 214   *qexpp=qexp;
 215 }
 216
 217 static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){
 218
 219   ogg_uint32_t qi=*qip;
 220   ogg_int32_t qexp=*qexpp;
 221
 222   asm("tst     %0,#0x0000ff00;"
 223       "moveq   %0,%0,lsl #8;"
 224       "subeq   %1,%1,#8;"
 225       "tst     %0,#0x0000f000;"
 226       "moveq   %0,%0,lsl #4;"
 227       "subeq   %1,%1,#4;"
 228       "tst     %0,#0x0000c000;"
 229       "moveq   %0,%0,lsl #2;"
 230       "subeq   %1,%1,#2;"
 231       "tst     %0,#0x00008000;"
 232       "moveq   %0,%0,lsl #1;"
 233       "subeq   %1,%1,#1;"
 234       : "+r"(qi),"+r"(qexp)
 235       :
 236       : "cc");
 237   *qip=qi;
 238   *qexpp=qexp;
 239 }
 240
 241 #endif
 242 #endif
 243