arm-gen.c

   1 /*
   2  *  ARMv4 code generator for TCC
   3  *
   4  *  Copyright (c) 2003 Daniel Glöckner
   5  *  Copyright (c) 2012 Thomas Preud'homme
   6  *
   7  *  Based on i386-gen.c by Fabrice Bellard
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifdef TARGET_DEFS_ONLY
  25
  26 #ifdef TCC_ARM_EABI
  27 #ifndef TCC_ARM_VFP // Avoid useless warning
  28 #define TCC_ARM_VFP
  29 #endif
  30 #endif
  31
  32 /* number of available registers */
  33 #ifdef TCC_ARM_VFP
  34 #define NB_REGS            13
  35 #else
  36 #define NB_REGS             9
  37 #endif
  38
  39 #ifndef TCC_ARM_VERSION
  40 # define TCC_ARM_VERSION 5
  41 #endif
  42
  43 /* a register can belong to several classes. The classes must be
  44    sorted from more general to more precise (see gv2() code which does
  45    assumptions on it). */
  46 #define RC_INT     0x0001 /* generic integer register */
  47 #define RC_FLOAT   0x0002 /* generic float register */
  48 #define RC_R0      0x0004
  49 #define RC_R1      0x0008
  50 #define RC_R2      0x0010
  51 #define RC_R3      0x0020
  52 #define RC_R12     0x0040
  53 #define RC_F0      0x0080
  54 #define RC_F1      0x0100
  55 #define RC_F2      0x0200
  56 #define RC_F3      0x0400
  57 #ifdef TCC_ARM_VFP
  58 #define RC_F4      0x0800
  59 #define RC_F5      0x1000
  60 #define RC_F6      0x2000
  61 #define RC_F7      0x4000
  62 #endif
  63 #define RC_IRET    RC_R0  /* function return: integer register */
  64 #define RC_LRET    RC_R1  /* function return: second integer register */
  65 #define RC_FRET    RC_F0  /* function return: float register */
  66
  67 /* pretty names for the registers */
  68 enum {
  69     TREG_R0 = 0,
  70     TREG_R1,
  71     TREG_R2,
  72     TREG_R3,
  73     TREG_R12,
  74     TREG_F0,
  75     TREG_F1,
  76     TREG_F2,
  77     TREG_F3,
  78 #ifdef TCC_ARM_VFP
  79     TREG_F4,
  80     TREG_F5,
  81     TREG_F6,
  82     TREG_F7,
  83 #endif
  84 };
  85
  86 #ifdef TCC_ARM_VFP
  87 #define T2CPR(t) (((t) & VT_BTYPE) != VT_FLOAT ? 0x100 : 0)
  88 #endif
  89
  90 /* return registers for function */
  91 #define REG_IRET TREG_R0 /* single word int return register */
  92 #define REG_LRET TREG_R1 /* second word return register (for long long) */
  93 #define REG_FRET TREG_F0 /* float return register */
  94
  95 #ifdef TCC_ARM_EABI
  96 #define TOK___divdi3 TOK___aeabi_ldivmod
  97 #define TOK___moddi3 TOK___aeabi_ldivmod
  98 #define TOK___udivdi3 TOK___aeabi_uldivmod
  99 #define TOK___umoddi3 TOK___aeabi_uldivmod
 100 #endif
 101
 102 /* defined if function parameters must be evaluated in reverse order */
 103 #define INVERT_FUNC_PARAMS
 104
 105 /* defined if structures are passed as pointers. Otherwise structures
 106    are directly pushed on stack. */
 107 //#define FUNC_STRUCT_PARAM_AS_PTR
 108
 109 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
 110 ST_DATA CType float_type, double_type, func_float_type, func_double_type;
 111 #define func_ldouble_type func_double_type
 112 #else
 113 #define func_float_type func_old_type
 114 #define func_double_type func_old_type
 115 #define func_ldouble_type func_old_type
 116 #endif
 117
 118 /* pointer size, in bytes */
 119 #define PTR_SIZE 4
 120
 121 /* long double size and alignment, in bytes */
 122 #ifdef TCC_ARM_VFP
 123 #define LDOUBLE_SIZE  8
 124 #endif
 125
 126 #ifndef LDOUBLE_SIZE
 127 #define LDOUBLE_SIZE  8
 128 #endif
 129
 130 #ifdef TCC_ARM_EABI
 131 #define LDOUBLE_ALIGN 8
 132 #else
 133 #define LDOUBLE_ALIGN 4
 134 #endif
 135
 136 /* maximum alignment (for aligned attribute support) */
 137 #define MAX_ALIGN     8
 138
 139 #define CHAR_IS_UNSIGNED
 140
 141 /******************************************************/
 142 /* ELF defines */
 143
 144 #define EM_TCC_TARGET EM_ARM
 145
 146 /* relocation type for 32 bit data relocation */
 147 #define R_DATA_32   R_ARM_ABS32
 148 #define R_DATA_PTR  R_ARM_ABS32
 149 #define R_JMP_SLOT  R_ARM_JUMP_SLOT
 150 #define R_COPY      R_ARM_COPY
 151
 152 #define ELF_START_ADDR 0x00008000
 153 #define ELF_PAGE_SIZE  0x1000
 154
 155 /******************************************************/
 156 #else /* ! TARGET_DEFS_ONLY */
 157 /******************************************************/
 158 #include "tcc.h"
 159
 160 ST_DATA const int reg_classes[NB_REGS] = {
 161     /* r0 */ RC_INT | RC_R0,
 162     /* r1 */ RC_INT | RC_R1,
 163     /* r2 */ RC_INT | RC_R2,
 164     /* r3 */ RC_INT | RC_R3,
 165     /* r12 */ RC_INT | RC_R12,
 166     /* f0 */ RC_FLOAT | RC_F0,
 167     /* f1 */ RC_FLOAT | RC_F1,
 168     /* f2 */ RC_FLOAT | RC_F2,
 169     /* f3 */ RC_FLOAT | RC_F3,
 170 #ifdef TCC_ARM_VFP
 171  /* d4/s8 */ RC_FLOAT | RC_F4,
 172 /* d5/s10 */ RC_FLOAT | RC_F5,
 173 /* d6/s12 */ RC_FLOAT | RC_F6,
 174 /* d7/s14 */ RC_FLOAT | RC_F7,
 175 #endif
 176 };
 177
 178 /* keep in sync with line 104 above */
 179 #if defined(TCC_ARM_EABI) && defined(TCC_ARM_VFP)
 180 ST_DATA CType float_type, double_type, func_float_type, func_double_type;
 181 #endif
 182
 183 static int func_sub_sp_offset, last_itod_magic;
 184 static int leaffunc;
 185
 186 static int two2mask(int a,int b) {
 187   return (reg_classes[a]|reg_classes[b])&~(RC_INT|RC_FLOAT);
 188 }
 189
 190 static int regmask(int r) {
 191   return reg_classes[r]&~(RC_INT|RC_FLOAT);
 192 }
 193
 194 /******************************************************/
 195
 196 void o(uint32_t i)
 197 {
 198   /* this is a good place to start adding big-endian support*/
 199   int ind1;
 200
 201   ind1 = ind + 4;
 202   if (!cur_text_section)
 203     tcc_error("compiler error! This happens f.ex. if the compiler\n"
 204          "can't evaluate constant expressions outside of a function.");
 205   if (ind1 > cur_text_section->data_allocated)
 206     section_realloc(cur_text_section, ind1);
 207   cur_text_section->data[ind++] = i&255;
 208   i>>=8;
 209   cur_text_section->data[ind++] = i&255;
 210   i>>=8;
 211   cur_text_section->data[ind++] = i&255;
 212   i>>=8;
 213   cur_text_section->data[ind++] = i;
 214 }
 215
 216 static uint32_t stuff_const(uint32_t op, uint32_t c)
 217 {
 218   int try_neg=0;
 219   uint32_t nc = 0, negop = 0;
 220
 221   switch(op&0x1F00000)
 222   {
 223     case 0x800000: //add
 224     case 0x400000: //sub
 225       try_neg=1;
 226       negop=op^0xC00000;
 227       nc=-c;
 228       break;
 229     case 0x1A00000: //mov
 230     case 0x1E00000: //mvn
 231       try_neg=1;
 232       negop=op^0x400000;
 233       nc=~c;
 234       break;
 235     case 0x200000: //xor
 236       if(c==~0)
 237         return (op&0xF010F000)|((op>>16)&0xF)|0x1E00000;
 238       break;
 239     case 0x0: //and
 240       if(c==~0)
 241         return (op&0xF010F000)|((op>>16)&0xF)|0x1A00000;
 242     case 0x1C00000: //bic
 243       try_neg=1;
 244       negop=op^0x1C00000;
 245       nc=~c;
 246       break;
 247     case 0x1800000: //orr
 248       if(c==~0)
 249         return (op&0xFFF0FFFF)|0x1E00000;
 250       break;
 251   }
 252   do {
 253     uint32_t m;
 254     int i;
 255     if(c<256) /* catch undefined <<32 */
 256       return op|c;
 257     for(i=2;i<32;i+=2) {
 258       m=(0xff>>i)|(0xff<<(32-i));
 259       if(!(c&~m))
 260         return op|(i<<7)|(c<<i)|(c>>(32-i));
 261     }
 262     op=negop;
 263     c=nc;
 264   } while(try_neg--);
 265   return 0;
 266 }
 267
 268
 269 //only add,sub
 270 void stuff_const_harder(uint32_t op, uint32_t v) {
 271   uint32_t x;
 272   x=stuff_const(op,v);
 273   if(x)
 274     o(x);
 275   else {
 276     uint32_t a[16], nv, no, o2, n2;
 277     int i,j,k;
 278     a[0]=0xff;
 279     o2=(op&0xfff0ffff)|((op&0xf000)<<4);;
 280     for(i=1;i<16;i++)
 281       a[i]=(a[i-1]>>2)|(a[i-1]<<30);
 282     for(i=0;i<12;i++)
 283       for(j=i<4?i+12:15;j>=i+4;j--)
 284         if((v&(a[i]|a[j]))==v) {
 285           o(stuff_const(op,v&a[i]));
 286           o(stuff_const(o2,v&a[j]));
 287           return;
 288         }
 289     no=op^0xC00000;
 290     n2=o2^0xC00000;
 291     nv=-v;
 292     for(i=0;i<12;i++)
 293       for(j=i<4?i+12:15;j>=i+4;j--)
 294         if((nv&(a[i]|a[j]))==nv) {
 295           o(stuff_const(no,nv&a[i]));
 296           o(stuff_const(n2,nv&a[j]));
 297           return;
 298         }
 299     for(i=0;i<8;i++)
 300       for(j=i+4;j<12;j++)
 301         for(k=i<4?i+12:15;k>=j+4;k--)
 302           if((v&(a[i]|a[j]|a[k]))==v) {
 303             o(stuff_const(op,v&a[i]));
 304             o(stuff_const(o2,v&a[j]));
 305             o(stuff_const(o2,v&a[k]));
 306             return;
 307           }
 308     no=op^0xC00000;
 309     nv=-v;
 310     for(i=0;i<8;i++)
 311       for(j=i+4;j<12;j++)
 312         for(k=i<4?i+12:15;k>=j+4;k--)
 313           if((nv&(a[i]|a[j]|a[k]))==nv) {
 314             o(stuff_const(no,nv&a[i]));
 315             o(stuff_const(n2,nv&a[j]));
 316             o(stuff_const(n2,nv&a[k]));
 317             return;
 318           }
 319     o(stuff_const(op,v&a[0]));
 320     o(stuff_const(o2,v&a[4]));
 321     o(stuff_const(o2,v&a[8]));
 322     o(stuff_const(o2,v&a[12]));
 323   }
 324 }
 325
 326 ST_FUNC uint32_t encbranch(int pos, int addr, int fail)
 327 {
 328   addr-=pos+8;
 329   addr/=4;
 330   if(addr>=0x1000000 || addr<-0x1000000) {
 331     if(fail)
 332       tcc_error("FIXME: function bigger than 32MB");
 333     return 0;
 334   }
 335   return 0x0A000000|(addr&0xffffff);
 336 }
 337
 338 int decbranch(int pos)
 339 {
 340   int x;
 341   x=*(uint32_t *)(cur_text_section->data + pos);
 342   x&=0x00ffffff;
 343   if(x&0x800000)
 344     x-=0x1000000;
 345   return x*4+pos+8;
 346 }
 347
 348 /* output a symbol and patch all calls to it */
 349 void gsym_addr(int t, int a)
 350 {
 351   uint32_t *x;
 352   int lt;
 353   while(t) {
 354     x=(uint32_t *)(cur_text_section->data + t);
 355     t=decbranch(lt=t);
 356     if(a==lt+4)
 357       *x=0xE1A00000; // nop
 358     else {
 359       *x &= 0xff000000;
 360       *x |= encbranch(lt,a,1);
 361     }
 362   }
 363 }
 364
 365 void gsym(int t)
 366 {
 367   gsym_addr(t, ind);
 368 }
 369
 370 #ifdef TCC_ARM_VFP
 371 static uint32_t vfpr(int r)
 372 {
 373   if(r<TREG_F0 || r>TREG_F7)
 374     tcc_error("compiler error! register %i is no vfp register",r);
 375   return r-5;
 376 }
 377 #else
 378 static uint32_t fpr(int r)
 379 {
 380   if(r<TREG_F0 || r>TREG_F3)
 381     tcc_error("compiler error! register %i is no fpa register",r);
 382   return r-5;
 383 }
 384 #endif
 385
 386 static uint32_t intr(int r)
 387 {
 388   if(r==4)
 389     return 12;
 390   if((r<0 || r>4) && r!=14)
 391     tcc_error("compiler error! register %i is no int register",r);
 392   return r;
 393 }
 394
 395 static void calcaddr(uint32_t *base, int *off, int *sgn, int maxoff, unsigned shift)
 396 {
 397   if(*off>maxoff || *off&((1<<shift)-1)) {
 398     uint32_t x, y;
 399     x=0xE280E000;
 400     if(*sgn)
 401       x=0xE240E000;
 402     x|=(*base)<<16;
 403     *base=14; // lr
 404     y=stuff_const(x,*off&~maxoff);
 405     if(y) {
 406       o(y);
 407       *off&=maxoff;
 408       return;
 409     }
 410     y=stuff_const(x,(*off+maxoff)&~maxoff);
 411     if(y) {
 412       o(y);
 413       *sgn=!*sgn;
 414       *off=((*off+maxoff)&~maxoff)-*off;
 415       return;
 416     }
 417     stuff_const_harder(x,*off&~maxoff);
 418     *off&=maxoff;
 419   }
 420 }
 421
 422 static uint32_t mapcc(int cc)
 423 {
 424   switch(cc)
 425   {
 426     case TOK_ULT:
 427       return 0x30000000; /* CC/LO */
 428     case TOK_UGE:
 429       return 0x20000000; /* CS/HS */
 430     case TOK_EQ:
 431       return 0x00000000; /* EQ */
 432     case TOK_NE:
 433       return 0x10000000; /* NE */
 434     case TOK_ULE:
 435       return 0x90000000; /* LS */
 436     case TOK_UGT:
 437       return 0x80000000; /* HI */
 438     case TOK_Nset:
 439       return 0x40000000; /* MI */
 440     case TOK_Nclear:
 441       return 0x50000000; /* PL */
 442     case TOK_LT:
 443       return 0xB0000000; /* LT */
 444     case TOK_GE:
 445       return 0xA0000000; /* GE */
 446     case TOK_LE:
 447       return 0xD0000000; /* LE */
 448     case TOK_GT:
 449       return 0xC0000000; /* GT */
 450   }
 451   tcc_error("unexpected condition code");
 452   return 0xE0000000; /* AL */
 453 }
 454
 455 static int negcc(int cc)
 456 {
 457   switch(cc)
 458   {
 459     case TOK_ULT:
 460       return TOK_UGE;
 461     case TOK_UGE:
 462       return TOK_ULT;
 463     case TOK_EQ:
 464       return TOK_NE;
 465     case TOK_NE:
 466       return TOK_EQ;
 467     case TOK_ULE:
 468       return TOK_UGT;
 469     case TOK_UGT:
 470       return TOK_ULE;
 471     case TOK_Nset:
 472       return TOK_Nclear;
 473     case TOK_Nclear:
 474       return TOK_Nset;
 475     case TOK_LT:
 476       return TOK_GE;
 477     case TOK_GE:
 478       return TOK_LT;
 479     case TOK_LE:
 480       return TOK_GT;
 481     case TOK_GT:
 482       return TOK_LE;
 483   }
 484   tcc_error("unexpected condition code");
 485   return TOK_NE;
 486 }
 487
 488 /* load 'r' from value 'sv' */
 489 void load(int r, SValue *sv)
 490 {
 491   int v, ft, fc, fr, sign;
 492   uint32_t op;
 493   SValue v1;
 494
 495   fr = sv->r;
 496   ft = sv->type.t;
 497   fc = sv->c.ul;
 498
 499   if(fc>=0)
 500     sign=0;
 501   else {
 502     sign=1;
 503     fc=-fc;
 504   }
 505
 506   v = fr & VT_VALMASK;
 507   if (fr & VT_LVAL) {
 508     uint32_t base = 0xB; // fp
 509     if(v == VT_LLOCAL) {
 510       v1.type.t = VT_PTR;
 511       v1.r = VT_LOCAL | VT_LVAL;
 512       v1.c.ul = sv->c.ul;
 513       load(base=14 /* lr */, &v1);
 514       fc=sign=0;
 515       v=VT_LOCAL;
 516     } else if(v == VT_CONST) {
 517       v1.type.t = VT_PTR;
 518       v1.r = fr&~VT_LVAL;
 519       v1.c.ul = sv->c.ul;
 520       v1.sym=sv->sym;
 521       load(base=14, &v1);
 522       fc=sign=0;
 523       v=VT_LOCAL;
 524     } else if(v < VT_CONST) {
 525       base=intr(v);
 526       fc=sign=0;
 527       v=VT_LOCAL;
 528     }
 529     if(v == VT_LOCAL) {
 530       if(is_float(ft)) {
 531         calcaddr(&base,&fc,&sign,1020,2);
 532 #ifdef TCC_ARM_VFP
 533         op=0xED100A00; /* flds */
 534         if(!sign)
 535           op|=0x800000;
 536         if ((ft & VT_BTYPE) != VT_FLOAT)
 537           op|=0x100;   /* flds -> fldd */
 538         o(op|(vfpr(r)<<12)|(fc>>2)|(base<<16));
 539 #else
 540         op=0xED100100;
 541         if(!sign)
 542           op|=0x800000;
 543 #if LDOUBLE_SIZE == 8
 544         if ((ft & VT_BTYPE) != VT_FLOAT)
 545           op|=0x8000;
 546 #else
 547         if ((ft & VT_BTYPE) == VT_DOUBLE)
 548           op|=0x8000;
 549         else if ((ft & VT_BTYPE) == VT_LDOUBLE)
 550           op|=0x400000;
 551 #endif
 552         o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
 553 #endif
 554       } else if((ft & (VT_BTYPE|VT_UNSIGNED)) == VT_BYTE
 555                 || (ft & VT_BTYPE) == VT_SHORT) {
 556         calcaddr(&base,&fc,&sign,255,0);
 557         op=0xE1500090;
 558         if ((ft & VT_BTYPE) == VT_SHORT)
 559           op|=0x20;
 560         if ((ft & VT_UNSIGNED) == 0)
 561           op|=0x40;
 562         if(!sign)
 563           op|=0x800000;
 564         o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
 565       } else {
 566         calcaddr(&base,&fc,&sign,4095,0);
 567         op=0xE5100000;
 568         if(!sign)
 569           op|=0x800000;
 570         if ((ft & VT_BTYPE) == VT_BYTE)
 571           op|=0x400000;
 572         o(op|(intr(r)<<12)|fc|(base<<16));
 573       }
 574       return;
 575     }
 576   } else {
 577     if (v == VT_CONST) {
 578       op=stuff_const(0xE3A00000|(intr(r)<<12),sv->c.ul);
 579       if (fr & VT_SYM || !op) {
 580         o(0xE59F0000|(intr(r)<<12));
 581         o(0xEA000000);
 582         if(fr & VT_SYM)
 583           greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
 584         o(sv->c.ul);
 585       } else
 586         o(op);
 587       return;
 588     } else if (v == VT_LOCAL) {
 589       op=stuff_const(0xE28B0000|(intr(r)<<12),sv->c.ul);
 590       if (fr & VT_SYM || !op) {
 591         o(0xE59F0000|(intr(r)<<12));
 592         o(0xEA000000);
 593         if(fr & VT_SYM) // needed ?
 594           greloc(cur_text_section, sv->sym, ind, R_ARM_ABS32);
 595         o(sv->c.ul);
 596         o(0xE08B0000|(intr(r)<<12)|intr(r));
 597       } else
 598         o(op);
 599       return;
 600     } else if(v == VT_CMP) {
 601       o(mapcc(sv->c.ul)|0x3A00001|(intr(r)<<12));
 602       o(mapcc(negcc(sv->c.ul))|0x3A00000|(intr(r)<<12));
 603       return;
 604     } else if (v == VT_JMP || v == VT_JMPI) {
 605       int t;
 606       t = v & 1;
 607       o(0xE3A00000|(intr(r)<<12)|t);
 608       o(0xEA000000);
 609       gsym(sv->c.ul);
 610       o(0xE3A00000|(intr(r)<<12)|(t^1));
 611       return;
 612     } else if (v < VT_CONST) {
 613       if(is_float(ft))
 614 #ifdef TCC_ARM_VFP
 615         o(0xEEB00A40|(vfpr(r)<<12)|vfpr(v)|T2CPR(ft)); /* fcpyX */
 616 #else
 617         o(0xEE008180|(fpr(r)<<12)|fpr(v));
 618 #endif
 619       else
 620         o(0xE1A00000|(intr(r)<<12)|intr(v));
 621       return;
 622     }
 623   }
 624   tcc_error("load unimplemented!");
 625 }
 626
 627 /* store register 'r' in lvalue 'v' */
 628 void store(int r, SValue *sv)
 629 {
 630   SValue v1;
 631   int v, ft, fc, fr, sign;
 632   uint32_t op;
 633
 634   fr = sv->r;
 635   ft = sv->type.t;
 636   fc = sv->c.ul;
 637
 638   if(fc>=0)
 639     sign=0;
 640   else {
 641     sign=1;
 642     fc=-fc;
 643   }
 644
 645   v = fr & VT_VALMASK;
 646   if (fr & VT_LVAL || fr == VT_LOCAL) {
 647     uint32_t base = 0xb;
 648     if(v < VT_CONST) {
 649       base=intr(v);
 650       v=VT_LOCAL;
 651       fc=sign=0;
 652     } else if(v == VT_CONST) {
 653       v1.type.t = ft;
 654       v1.r = fr&~VT_LVAL;
 655       v1.c.ul = sv->c.ul;
 656       v1.sym=sv->sym;
 657       load(base=14, &v1);
 658       fc=sign=0;
 659       v=VT_LOCAL;
 660     }
 661     if(v == VT_LOCAL) {
 662        if(is_float(ft)) {
 663         calcaddr(&base,&fc,&sign,1020,2);
 664 #ifdef TCC_ARM_VFP
 665         op=0xED000A00; /* fsts */
 666         if(!sign)
 667           op|=0x800000;
 668         if ((ft & VT_BTYPE) != VT_FLOAT)
 669           op|=0x100;   /* fsts -> fstd */
 670         o(op|(vfpr(r)<<12)|(fc>>2)|(base<<16));
 671 #else
 672         op=0xED000100;
 673         if(!sign)
 674           op|=0x800000;
 675 #if LDOUBLE_SIZE == 8
 676         if ((ft & VT_BTYPE) != VT_FLOAT)
 677           op|=0x8000;
 678 #else
 679         if ((ft & VT_BTYPE) == VT_DOUBLE)
 680           op|=0x8000;
 681         if ((ft & VT_BTYPE) == VT_LDOUBLE)
 682           op|=0x400000;
 683 #endif
 684         o(op|(fpr(r)<<12)|(fc>>2)|(base<<16));
 685 #endif
 686         return;
 687       } else if((ft & VT_BTYPE) == VT_SHORT) {
 688         calcaddr(&base,&fc,&sign,255,0);
 689         op=0xE14000B0;
 690         if(!sign)
 691           op|=0x800000;
 692         o(op|(intr(r)<<12)|(base<<16)|((fc&0xf0)<<4)|(fc&0xf));
 693       } else {
 694         calcaddr(&base,&fc,&sign,4095,0);
 695         op=0xE5000000;
 696         if(!sign)
 697           op|=0x800000;
 698         if ((ft & VT_BTYPE) == VT_BYTE)
 699           op|=0x400000;
 700         o(op|(intr(r)<<12)|fc|(base<<16));
 701       }
 702       return;
 703     }
 704   }
 705   tcc_error("store unimplemented");
 706 }
 707
 708 static void gadd_sp(int val)
 709 {
 710   stuff_const_harder(0xE28DD000,val);
 711 }
 712
 713 /* 'is_jmp' is '1' if it is a jump */
 714 static void gcall_or_jmp(int is_jmp)
 715 {
 716   int r;
 717   if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
 718     uint32_t x;
 719     /* constant case */
 720     x=encbranch(ind,ind+vtop->c.ul,0);
 721     if(x) {
 722       if (vtop->r & VT_SYM) {
 723         /* relocation case */
 724         greloc(cur_text_section, vtop->sym, ind, R_ARM_PC24);
 725       } else
 726         put_elf_reloc(symtab_section, cur_text_section, ind, R_ARM_PC24, 0);
 727       o(x|(is_jmp?0xE0000000:0xE1000000));
 728     } else {
 729       if(!is_jmp)
 730         o(0xE28FE004); // add lr,pc,#4
 731       o(0xE51FF004);   // ldr pc,[pc,#-4]
 732       if (vtop->r & VT_SYM)
 733         greloc(cur_text_section, vtop->sym, ind, R_ARM_ABS32);
 734       o(vtop->c.ul);
 735     }
 736   } else {
 737     /* otherwise, indirect call */
 738     r = gv(RC_INT);
 739     if(!is_jmp)
 740       o(0xE1A0E00F);       // mov lr,pc
 741     o(0xE1A0F000|intr(r)); // mov pc,r
 742   }
 743 }
 744
 745 #ifdef TCC_ARM_HARDFLOAT
 746 static int is_float_hgen_aggr(CType *type)
 747 {
 748   if ((type->t & VT_BTYPE) == VT_STRUCT) {
 749     struct Sym *ref;
 750     int btype, nb_fields = 0;
 751
 752     ref = type->ref;
 753     btype = ref->type.t & VT_BTYPE;
 754     if (btype == VT_FLOAT || btype == VT_DOUBLE) {
 755       for(; ref && btype == (ref->type.t & VT_BTYPE); ref = ref->next, nb_fields++);
 756       return !ref && nb_fields <= 4;
 757     }
 758   }
 759   return 0;
 760 }
 761
 762 struct avail_regs {
 763   /* worst case: f(float, double, 3 float struct, double, 3 float struct, double) */
 764   signed char avail[3];
 765   int first_hole;
 766   int last_hole;
 767   int first_free_reg;
 768 };
 769
 770 #define AVAIL_REGS_INITIALIZER (struct avail_regs) { { 0, 0, 0}, 0, 0, 0 }
 771
 772 /* Assign a register for a CPRC param with correct size and alignment
 773  * size and align are in bytes, as returned by type_size */
 774 int assign_fpreg(struct avail_regs *avregs, int align, int size)
 775 {
 776   int first_reg = 0;
 777
 778   if (avregs->first_free_reg == -1)
 779     return -1;
 780   if (align >> 3) { // alignment needed (base type: double)
 781     first_reg = avregs->first_free_reg;
 782     if (first_reg & 1)
 783       avregs->avail[avregs->last_hole++] = first_reg++;
 784   } else {
 785     if (size == 4 && avregs->first_hole != avregs->last_hole)
 786       return avregs->avail[avregs->first_hole++];
 787     else
 788       first_reg = avregs->first_free_reg;
 789   }
 790   if (first_reg + size / 4 <= 16) {
 791     avregs->first_free_reg = first_reg + size / 4;
 792     return first_reg;
 793   }
 794   avregs->first_free_reg = -1;
 795   return -1;
 796 }
 797 #endif
 798
 799 /* Generate function call. The function address is pushed first, then
 800    all the parameters in call order. This functions pops all the
 801    parameters and the function address. */
 802 void gfunc_call(int nb_args)
 803 {
 804   int size, align, r, args_size, i, ncrn, ncprn, argno, vfp_argno;
 805   signed char plan[4][2]={{-1,-1},{-1,-1},{-1,-1},{-1,-1}};
 806   SValue *before_stack = NULL; /* SValue before first on stack argument */
 807   SValue *before_vfpreg_hfa = NULL; /* SValue before first in VFP reg hfa argument */
 808 #ifdef TCC_ARM_HARDFLOAT
 809   struct avail_regs avregs = AVAIL_REGS_INITIALIZER;
 810   signed char vfp_plan[16];
 811   int plan2[4+16];
 812   int variadic;
 813 #else
 814   int plan2[4]={0,0,0,0};
 815 #endif
 816   int vfp_todo=0;
 817   int todo=0, keep;
 818
 819 #ifdef TCC_ARM_HARDFLOAT
 820   memset(vfp_plan, -1, sizeof(vfp_plan));
 821   memset(plan2, 0, sizeof(plan2));
 822   variadic = (vtop[-nb_args].type.ref->c == FUNC_ELLIPSIS);
 823 #endif
 824   r = vtop->r & VT_VALMASK;
 825   if (r == VT_CMP || (r & ~1) == VT_JMP)
 826     gv(RC_INT);
 827 #ifdef TCC_ARM_EABI
 828   if((vtop[-nb_args].type.ref->type.t & VT_BTYPE) == VT_STRUCT
 829      && type_size(&vtop[-nb_args].type.ref->type, &align) <= 4) {
 830     SValue tmp;
 831     tmp=vtop[-nb_args];
 832     vtop[-nb_args]=vtop[-nb_args+1];
 833     vtop[-nb_args+1]=tmp;
 834     --nb_args;
 835   }
 836
 837   vpushi(0), nb_args++;
 838   vtop->type.t = VT_LLONG;
 839   args_size = 0;
 840 #endif
 841   ncrn = ncprn = argno = vfp_argno = 0;
 842   /* Assign argument to registers and stack with alignment.
 843      If, considering alignment constraints, enough registers of the correct type
 844      (core or VFP) are free for the current argument, assign them to it, else
 845      allocate on stack with correct alignment. Whenever a structure is allocated
 846      in registers or on stack, it is always put on the stack at this stage. The
 847      stack is divided in 3 zones. The zone are, from low addresses to high
 848      addresses: structures to be loaded in core registers, structures to be
 849      loaded in VFP registers, argument allocated to stack. SValue's representing
 850      structures in the first zone are moved just after the SValue pointed by
 851      before_vfpreg_hfa. SValue's representing structures in the second zone are
 852      moved just after the SValue pointer by before_stack. */
 853   for(i = nb_args; i-- ;) {
 854     int j, assigned_vfpreg = 0;
 855     size = type_size(&vtop[-i].type, &align);
 856     switch(vtop[-i].type.t & VT_BTYPE) {
 857       case VT_STRUCT:
 858       case VT_FLOAT:
 859       case VT_DOUBLE:
 860       case VT_LDOUBLE:
 861 #ifdef TCC_ARM_HARDFLOAT
 862       if (!variadic) {
 863         int hfa = 0; /* Homogeneous float aggregate */
 864
 865         if (is_float(vtop[-i].type.t)
 866             || (hfa = is_float_hgen_aggr(&vtop[-i].type))) {
 867           int end_reg;
 868
 869           assigned_vfpreg = assign_fpreg(&avregs, align, size);
 870           end_reg = assigned_vfpreg + (size - 1) / 4;
 871           if (assigned_vfpreg >= 0) {
 872             vfp_plan[vfp_argno++]=TREG_F0 + assigned_vfpreg/2;
 873             if (hfa) {
 874               /* before_stack can only have been set because all core registers
 875                  are assigned, so no need to care about before_vfpreg_hfa if
 876                  before_stack is set */
 877               if (before_stack) {
 878                 vrote(&vtop[-i], &vtop[-i] - before_stack);
 879                 before_stack++;
 880               } else if (!before_vfpreg_hfa)
 881                 before_vfpreg_hfa = &vtop[-i-1];
 882               for (j = assigned_vfpreg; j <= end_reg; j++)
 883                 vfp_todo|=(1<<j);
 884             }
 885             continue;
 886           } else {
 887             if (!hfa)
 888               vfp_argno++;
 889             /* No need to update before_stack as no more hfa can be allocated in
 890                VFP regs */
 891             if (!before_vfpreg_hfa)
 892               before_vfpreg_hfa = &vtop[-i-1];
 893             break;
 894           }
 895         }
 896       }
 897 #endif
 898       ncrn = (ncrn + (align-1)/4) & -(align/4);
 899       size = (size + 3) & -4;
 900       if (ncrn + size/4 <= 4 || (ncrn < 4 && assigned_vfpreg != -1)) {
 901         /* Either there is HFA in VFP registers, or there is arguments on stack,
 902            it cannot be both. Hence either before_stack already points after
 903            the slot where the vtop[-i] SValue is moved, or before_stack will not
 904            be used */
 905         if (before_vfpreg_hfa) {
 906           vrote(&vtop[-i], &vtop[-i] - before_vfpreg_hfa);
 907           before_vfpreg_hfa++;
 908         }
 909         for (j = ncrn; j < 4 && j < ncrn + size / 4; j++)
 910           todo|=(1<<j);
 911         ncrn+=size/4;
 912         if (ncrn > 4) {
 913           args_size = (ncrn - 4) * 4;
 914           if (!before_stack)
 915             before_stack = &vtop[-i-1];
 916         }
 917       }
 918       else {
 919         ncrn = 4;
 920         /* No need to set before_vfpreg_hfa if not set since there will no
 921            longer be any structure assigned to core registers */
 922         if (!before_stack)
 923           before_stack = &vtop[-i-1];
 924         break;
 925       }
 926       continue;
 927       default:
 928 #ifdef TCC_ARM_EABI
 929       if (!i) {
 930         break;
 931       }
 932 #endif
 933       if (ncrn < 4) {
 934         int is_long = (vtop[-i].type.t & VT_BTYPE) == VT_LLONG;
 935
 936         if (is_long) {
 937           ncrn = (ncrn + 1) & -2;
 938           if (ncrn == 4) {
 939             argno++;
 940             break;
 941           }
 942         }
 943         plan[argno++][0]=ncrn++;
 944         if (is_long) {
 945           plan[argno-1][1]=ncrn++;
 946         }
 947         continue;
 948       }
 949       argno++;
 950     }
 951 #ifdef TCC_ARM_EABI
 952     if(args_size & (align-1)) {
 953       vpushi(0);
 954       vtop->type.t = VT_VOID; /* padding */
 955       vrott(i+2);
 956       args_size += 4;
 957       nb_args++;
 958       argno++;
 959     }
 960 #endif
 961     args_size += (size + 3) & -4;
 962   }
 963 #ifdef TCC_ARM_EABI
 964   vtop--, nb_args--;
 965 #endif
 966   args_size = keep = 0;
 967   for(i = 0;i < nb_args; i++) {
 968     vrotb(keep+1);
 969     if ((vtop->type.t & VT_BTYPE) == VT_STRUCT) {
 970       size = type_size(&vtop->type, &align);
 971       /* align to stack align size */
 972       size = (size + 3) & -4;
 973       /* allocate the necessary size on stack */
 974       gadd_sp(-size);
 975       /* generate structure store */
 976       r = get_reg(RC_INT);
 977       o(0xE1A0000D|(intr(r)<<12));
 978       vset(&vtop->type, r | VT_LVAL, 0);
 979       vswap();
 980       vstore();
 981       vtop--;
 982       args_size += size;
 983     } else if (is_float(vtop->type.t)) {
 984 #ifdef TCC_ARM_HARDFLOAT
 985       if (!variadic && --vfp_argno<16 && vfp_plan[vfp_argno]!=-1) {
 986         plan2[keep++]=vfp_plan[vfp_argno];
 987         continue;
 988       }
 989 #endif
 990 #ifdef TCC_ARM_VFP
 991       r=vfpr(gv(RC_FLOAT))<<12;
 992       size=4;
 993       if ((vtop->type.t & VT_BTYPE) != VT_FLOAT)
 994       {
 995         size=8;
 996         r|=0x101; /* fstms -> fstmd */
 997       }
 998       o(0xED2D0A01+r);
 999 #else
1000       r=fpr(gv(RC_FLOAT))<<12;
1001       if ((vtop->type.t & VT_BTYPE) == VT_FLOAT)
1002         size = 4;
1003       else if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
1004         size = 8;
1005       else
1006         size = LDOUBLE_SIZE;
1007
1008       if (size == 12)
1009         r|=0x400000;
1010       else if(size == 8)
1011         r|=0x8000;
1012
1013       o(0xED2D0100|r|(size>>2));
1014 #endif
1015       vtop--;
1016       args_size += size;
1017     } else {
1018       int s;
1019       /* simple type (currently always same size) */
1020       /* XXX: implicit cast ? */
1021       size=4;
1022       if ((vtop->type.t & VT_BTYPE) == VT_LLONG) {
1023         lexpand_nr();
1024         s=-1;
1025         if(--argno<4 && plan[argno][1]!=-1)
1026           s=plan[argno][1];
1027         argno++;
1028         size = 8;
1029         if(s==-1) {
1030           r = gv(RC_INT);
1031           o(0xE52D0004|(intr(r)<<12)); /* str r,[sp,#-4]! */
1032           vtop--;
1033         } else {
1034           size=0;
1035           plan2[keep]=s;
1036           keep++;
1037           vswap();
1038         }
1039       }
1040       s=-1;
1041       if(--argno<4 && plan[argno][0]!=-1)
1042         s=plan[argno][0];
1043 #ifdef TCC_ARM_EABI
1044       if(vtop->type.t == VT_VOID) {
1045         if(s == -1)
1046           o(0xE24DD004); /* sub sp,sp,#4 */
1047         vtop--;
1048       } else
1049 #endif
1050       if(s == -1) {
1051         r = gv(RC_INT);
1052         o(0xE52D0004|(intr(r)<<12)); /* str r,[sp,#-4]! */
1053         vtop--;
1054       } else {
1055         size=0;
1056         plan2[keep]=s;
1057         keep++;
1058       }
1059       args_size += size;
1060     }
1061   }
1062   for(i = 0; i < keep; i++) {
1063     vrotb(keep);
1064     gv(regmask(plan2[i]));
1065 #ifdef TCC_ARM_HARDFLOAT
1066     /* arg is in s(2d+1): plan2[i]<plan2[i+1] => alignment occured (ex f,d,f) */
1067     if (i < keep - 1 && is_float(vtop->type.t) && (plan2[i] <= plan2[i + 1])) {
1068       o(0xEEF00A40|(vfpr(plan2[i])<<12)|vfpr(plan2[i]));
1069     }
1070 #endif
1071   }
1072 save_regs(keep); /* save used temporary registers */
1073   keep++;
1074   if(ncrn) {
1075     int nb_regs=0;
1076     if (ncrn>4)
1077       ncrn=4;
1078     todo&=((1<<ncrn)-1);
1079     if(todo) {
1080       int i;
1081       o(0xE8BD0000|todo);
1082       for(i=0;i<4;i++)
1083         if(todo&(1<<i)) {
1084           vpushi(0);
1085           vtop->r=i;
1086           keep++;
1087           nb_regs++;
1088         }
1089     }
1090     args_size-=nb_regs*4;
1091   }
1092   if(vfp_todo) {
1093     int nb_fregs=0;
1094
1095     for(i=0;i<16;i++)
1096       if(vfp_todo&(1<<i)) {
1097         o(0xED9D0A00|(i&1)<<22|(i>>1)<<12|nb_fregs);
1098         vpushi(0);
1099         /* There might be 2 floats in a double VFP reg but that doesn't seem
1100            to matter */
1101         if (!(i%2))
1102           vtop->r=TREG_F0+i/2;
1103         keep++;
1104         nb_fregs++;
1105       }
1106     if (nb_fregs) {
1107       gadd_sp(nb_fregs*4);
1108       args_size-=nb_fregs*4;
1109     }
1110   }
1111   vrotb(keep);
1112   gcall_or_jmp(0);
1113   if (args_size)
1114       gadd_sp(args_size);
1115 #ifdef TCC_ARM_EABI
1116   if((vtop->type.ref->type.t & VT_BTYPE) == VT_STRUCT
1117      && type_size(&vtop->type.ref->type, &align) <= 4)
1118   {
1119     store(REG_IRET,vtop-keep);
1120     ++keep;
1121   }
1122 #ifdef TCC_ARM_VFP
1123 #ifdef TCC_ARM_HARDFLOAT
1124   else if(variadic && is_float(vtop->type.ref->type.t)) {
1125 #else
1126   else if(is_float(vtop->type.ref->type.t)) {
1127 #endif
1128     if((vtop->type.ref->type.t & VT_BTYPE) == VT_FLOAT) {
1129       o(0xEE000A10); /* fmsr s0,r0 */
1130     } else {
1131       o(0xEE000B10); /* fmdlr d0,r0 */
1132       o(0xEE201B10); /* fmdhr d0,r1 */
1133     }
1134   }
1135 #endif
1136 #endif
1137   vtop-=keep;
1138   leaffunc = 0;
1139 }
1140
1141 /* generate function prolog of type 't' */
1142 void gfunc_prolog(CType *func_type)
1143 {
1144   Sym *sym,*sym2;
1145   int n,nf,size,align, variadic, struct_ret = 0;
1146 #ifdef TCC_ARM_HARDFLOAT
1147   struct avail_regs avregs = AVAIL_REGS_INITIALIZER;
1148 #endif
1149
1150   sym = func_type->ref;
1151   func_vt = sym->type;
1152
1153   n = nf = 0;
1154   variadic = (func_type->ref->c == FUNC_ELLIPSIS);
1155   if((func_vt.t & VT_BTYPE) == VT_STRUCT
1156      && type_size(&func_vt,&align) > 4)
1157   {
1158     n++;
1159     struct_ret = 1;
1160     func_vc = 12; /* Offset from fp of the place to store the result */
1161   }
1162   for(sym2=sym->next;sym2 && (n<4 || nf<16);sym2=sym2->next) {
1163     size = type_size(&sym2->type, &align);
1164 #ifdef TCC_ARM_HARDFLOAT
1165     if (!variadic && (is_float(sym2->type.t)
1166         || is_float_hgen_aggr(&sym2->type))) {
1167       int tmpnf = assign_fpreg(&avregs, align, size) + 1;
1168       nf = (tmpnf > nf) ? tmpnf : nf;
1169     } else
1170 #endif
1171     if (n < 4)
1172       n += (size + 3) / 4;
1173   }
1174   o(0xE1A0C00D); /* mov ip,sp */
1175   if(variadic)
1176     n=4;
1177   if(n) {
1178     if(n>4)
1179       n=4;
1180 #ifdef TCC_ARM_EABI
1181     n=(n+1)&-2;
1182 #endif
1183     o(0xE92D0000|((1<<n)-1)); /* save r0-r4 on stack if needed */
1184   }
1185   if (nf) {
1186     if (nf>16)
1187       nf=16;
1188     nf=(nf+1)&-2; /* nf => HARDFLOAT => EABI */
1189     o(0xED2D0A00|nf); /* save s0-s15 on stack if needed */
1190   }
1191   o(0xE92D5800); /* save fp, ip, lr */
1192   o(0xE1A0B00D); /* mov fp, sp */
1193   func_sub_sp_offset = ind;
1194   o(0xE1A00000); /* nop, leave space for stack adjustment in epilogue */
1195   {
1196     int addr, pn = struct_ret, sn = 0; /* pn=core, sn=stack */
1197
1198 #ifdef TCC_ARM_HARDFLOAT
1199     avregs = AVAIL_REGS_INITIALIZER;
1200 #endif
1201     while ((sym = sym->next)) {
1202       CType *type;
1203       type = &sym->type;
1204       size = type_size(type, &align);
1205       size = (size + 3) >> 2;
1206 #ifdef TCC_ARM_HARDFLOAT
1207       if (!variadic && (is_float(sym->type.t)
1208           || is_float_hgen_aggr(&sym->type))) {
1209         int fpn = assign_fpreg(&avregs, align, size << 2);
1210         if (fpn >= 0) {
1211           addr = fpn * 4;
1212         } else
1213           goto from_stack;
1214       } else
1215 #endif
1216       if (pn < 4) {
1217 #ifdef TCC_ARM_EABI
1218         pn = (pn + (align-1)/4) & -(align/4);
1219 #endif
1220         addr = (nf + pn) * 4;
1221         pn += size;
1222         if (!sn && pn > 4)
1223           sn = (pn - 4);
1224       } else {
1225 #ifdef TCC_ARM_HARDFLOAT
1226 from_stack:
1227 #endif
1228 #ifdef TCC_ARM_EABI
1229         sn = (sn + (align-1)/4) & -(align/4);
1230 #endif
1231         addr = (n + nf + sn) * 4;
1232         sn += size;
1233       }
1234       sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | lvalue_type(type->t), addr+12);
1235     }
1236   }
1237   last_itod_magic=0;
1238   leaffunc = 1;
1239   loc = 0;
1240 }
1241
1242 /* generate function epilog */
1243 void gfunc_epilog(void)
1244 {
1245   uint32_t x;
1246   int diff;
1247 #ifdef TCC_ARM_EABI
1248   /* Useless but harmless copy of the float result into main register(s) in case
1249      of variadic function in the hardfloat variant */
1250   if(is_float(func_vt.t)) {
1251     if((func_vt.t & VT_BTYPE) == VT_FLOAT)
1252       o(0xEE100A10); /* fmrs r0, s0 */
1253     else {
1254       o(0xEE100B10); /* fmrdl r0, d0 */
1255       o(0xEE301B10); /* fmrdh r1, d0 */
1256     }
1257   }
1258 #endif
1259   o(0xE89BA800); /* restore fp, sp, pc */
1260   diff = (-loc + 3) & -4;
1261 #ifdef TCC_ARM_EABI
1262   if(!leaffunc)
1263     diff = ((diff + 11) & -8) - 4;
1264 #endif
1265   if(diff > 0) {
1266     x=stuff_const(0xE24BD000, diff); /* sub sp,fp,# */
1267     if(x)
1268       *(uint32_t *)(cur_text_section->data + func_sub_sp_offset) = x;
1269     else {
1270       int addr;
1271       addr=ind;
1272       o(0xE59FC004); /* ldr ip,[pc+4] */
1273       o(0xE04BD00C); /* sub sp,fp,ip  */
1274       o(0xE1A0F00E); /* mov pc,lr */
1275       o(diff);
1276       *(uint32_t *)(cur_text_section->data + func_sub_sp_offset) = 0xE1000000|encbranch(func_sub_sp_offset,addr,1);
1277     }
1278   }
1279 }
1280
1281 /* generate a jump to a label */
1282 int gjmp(int t)
1283 {
1284   int r;
1285   r=ind;
1286   o(0xE0000000|encbranch(r,t,1));
1287   return r;
1288 }
1289
1290 /* generate a jump to a fixed address */
1291 void gjmp_addr(int a)
1292 {
1293   gjmp(a);
1294 }
1295
1296 /* generate a test. set 'inv' to invert test. Stack entry is popped */
1297 int gtst(int inv, int t)
1298 {
1299   int v, r;
1300   uint32_t op;
1301   v = vtop->r & VT_VALMASK;
1302   r=ind;
1303   if (v == VT_CMP) {
1304     op=mapcc(inv?negcc(vtop->c.i):vtop->c.i);
1305     op|=encbranch(r,t,1);
1306     o(op);
1307     t=r;
1308   } else if (v == VT_JMP || v == VT_JMPI) {
1309     if ((v & 1) == inv) {
1310       if(!vtop->c.i)
1311         vtop->c.i=t;
1312       else {
1313         uint32_t *x;
1314         int p,lp;
1315         if(t) {
1316           p = vtop->c.i;
1317           do {
1318             p = decbranch(lp=p);
1319           } while(p);
1320           x = (uint32_t *)(cur_text_section->data + lp);
1321           *x &= 0xff000000;
1322           *x |= encbranch(lp,t,1);
1323         }
1324         t = vtop->c.i;
1325       }
1326     } else {
1327       t = gjmp(t);
1328       gsym(vtop->c.i);
1329     }
1330   } else {
1331     if (is_float(vtop->type.t)) {
1332       r=gv(RC_FLOAT);
1333 #ifdef TCC_ARM_VFP
1334       o(0xEEB50A40|(vfpr(r)<<12)|T2CPR(vtop->type.t)); /* fcmpzX */
1335       o(0xEEF1FA10); /* fmstat */
1336 #else
1337       o(0xEE90F118|(fpr(r)<<16));
1338 #endif
1339       vtop->r = VT_CMP;
1340       vtop->c.i = TOK_NE;
1341       return gtst(inv, t);
1342     } else if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1343       /* constant jmp optimization */
1344       if ((vtop->c.i != 0) != inv)
1345         t = gjmp(t);
1346     } else {
1347       v = gv(RC_INT);
1348       o(0xE3300000|(intr(v)<<16));
1349       vtop->r = VT_CMP;
1350       vtop->c.i = TOK_NE;
1351       return gtst(inv, t);
1352     }
1353   }
1354   vtop--;
1355   return t;
1356 }
1357
1358 /* generate an integer binary operation */
1359 void gen_opi(int op)
1360 {
1361   int c, func = 0;
1362   uint32_t opc = 0, r, fr;
1363   unsigned short retreg = REG_IRET;
1364
1365   c=0;
1366   switch(op) {
1367     case '+':
1368       opc = 0x8;
1369       c=1;
1370       break;
1371     case TOK_ADDC1: /* add with carry generation */
1372       opc = 0x9;
1373       c=1;
1374       break;
1375     case '-':
1376       opc = 0x4;
1377       c=1;
1378       break;
1379     case TOK_SUBC1: /* sub with carry generation */
1380       opc = 0x5;
1381       c=1;
1382       break;
1383     case TOK_ADDC2: /* add with carry use */
1384       opc = 0xA;
1385       c=1;
1386       break;
1387     case TOK_SUBC2: /* sub with carry use */
1388       opc = 0xC;
1389       c=1;
1390       break;
1391     case '&':
1392       opc = 0x0;
1393       c=1;
1394       break;
1395     case '^':
1396       opc = 0x2;
1397       c=1;
1398       break;
1399     case '|':
1400       opc = 0x18;
1401       c=1;
1402       break;
1403     case '*':
1404       gv2(RC_INT, RC_INT);
1405       r = vtop[-1].r;
1406       fr = vtop[0].r;
1407       vtop--;
1408       o(0xE0000090|(intr(r)<<16)|(intr(r)<<8)|intr(fr));
1409       return;
1410     case TOK_SHL:
1411       opc = 0;
1412       c=2;
1413       break;
1414     case TOK_SHR:
1415       opc = 1;
1416       c=2;
1417       break;
1418     case TOK_SAR:
1419       opc = 2;
1420       c=2;
1421       break;
1422     case '/':
1423     case TOK_PDIV:
1424       func=TOK___divsi3;
1425       c=3;
1426       break;
1427     case TOK_UDIV:
1428       func=TOK___udivsi3;
1429       c=3;
1430       break;
1431     case '%':
1432 #ifdef TCC_ARM_EABI
1433       func=TOK___aeabi_idivmod;
1434       retreg=REG_LRET;
1435 #else
1436       func=TOK___modsi3;
1437 #endif
1438       c=3;
1439       break;
1440     case TOK_UMOD:
1441 #ifdef TCC_ARM_EABI
1442       func=TOK___aeabi_uidivmod;
1443       retreg=REG_LRET;
1444 #else
1445       func=TOK___umodsi3;
1446 #endif
1447       c=3;
1448       break;
1449     case TOK_UMULL:
1450       gv2(RC_INT, RC_INT);
1451       r=intr(vtop[-1].r2=get_reg(RC_INT));
1452       c=vtop[-1].r;
1453       vtop[-1].r=get_reg_ex(RC_INT,regmask(c));
1454       vtop--;
1455       o(0xE0800090|(r<<16)|(intr(vtop->r)<<12)|(intr(c)<<8)|intr(vtop[1].r));
1456       return;
1457     default:
1458       opc = 0x15;
1459       c=1;
1460       break;
1461   }
1462   switch(c) {
1463     case 1:
1464       if((vtop[-1].r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1465         if(opc == 4 || opc == 5 || opc == 0xc) {
1466           vswap();
1467           opc|=2; // sub -> rsb
1468         }
1469       }
1470       if ((vtop->r & VT_VALMASK) == VT_CMP ||
1471           (vtop->r & (VT_VALMASK & ~1)) == VT_JMP)
1472         gv(RC_INT);
1473       vswap();
1474       c=intr(gv(RC_INT));
1475       vswap();
1476       opc=0xE0000000|(opc<<20)|(c<<16);
1477       if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1478         uint32_t x;
1479         x=stuff_const(opc|0x2000000,vtop->c.i);
1480         if(x) {
1481           r=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
1482           o(x|(r<<12));
1483           goto done;
1484         }
1485       }
1486       fr=intr(gv(RC_INT));
1487       r=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
1488       o(opc|(r<<12)|fr);
1489 done:
1490       vtop--;
1491       if (op >= TOK_ULT && op <= TOK_GT) {
1492         vtop->r = VT_CMP;
1493         vtop->c.i = op;
1494       }
1495       break;
1496     case 2:
1497       opc=0xE1A00000|(opc<<5);
1498       if ((vtop->r & VT_VALMASK) == VT_CMP ||
1499           (vtop->r & (VT_VALMASK & ~1)) == VT_JMP)
1500         gv(RC_INT);
1501       vswap();
1502       r=intr(gv(RC_INT));
1503       vswap();
1504       opc|=r;
1505       if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
1506         fr=intr(vtop[-1].r=get_reg_ex(RC_INT,regmask(vtop[-1].r)));
1507         c = vtop->c.i & 0x1f;
1508         o(opc|(c<<7)|(fr<<12));
1509       } else {
1510         fr=intr(gv(RC_INT));
1511         c=intr(vtop[-1].r=get_reg_ex(RC_INT,two2mask(vtop->r,vtop[-1].r)));
1512         o(opc|(c<<12)|(fr<<8)|0x10);
1513       }
1514       vtop--;
1515       break;
1516     case 3:
1517       vpush_global_sym(&func_old_type, func);
1518       vrott(3);
1519       gfunc_call(2);
1520       vpushi(0);
1521       vtop->r = retreg;
1522       break;
1523     default:
1524       tcc_error("gen_opi %i unimplemented!",op);
1525   }
1526 }
1527
1528 #ifdef TCC_ARM_VFP
1529 static int is_zero(int i)
1530 {
1531   if((vtop[i].r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1532     return 0;
1533   if (vtop[i].type.t == VT_FLOAT)
1534     return (vtop[i].c.f == 0.f);
1535   else if (vtop[i].type.t == VT_DOUBLE)
1536     return (vtop[i].c.d == 0.0);
1537   return (vtop[i].c.ld == 0.l);
1538 }
1539
1540 /* generate a floating point operation 'v = t1 op t2' instruction. The
1541  *    two operands are guaranted to have the same floating point type */
1542 void gen_opf(int op)
1543 {
1544   uint32_t x;
1545   int fneg=0,r;
1546   x=0xEE000A00|T2CPR(vtop->type.t);
1547   switch(op) {
1548     case '+':
1549       if(is_zero(-1))
1550         vswap();
1551       if(is_zero(0)) {
1552         vtop--;
1553         return;
1554       }
1555       x|=0x300000;
1556       break;
1557     case '-':
1558       x|=0x300040;
1559       if(is_zero(0)) {
1560         vtop--;
1561         return;
1562       }
1563       if(is_zero(-1)) {
1564         x|=0x810000; /* fsubX -> fnegX */
1565         vswap();
1566         vtop--;
1567         fneg=1;
1568       }
1569       break;
1570     case '*':
1571       x|=0x200000;
1572       break;
1573     case '/':
1574       x|=0x800000;
1575       break;
1576     default:
1577       if(op < TOK_ULT || op > TOK_GT) {
1578         tcc_error("unknown fp op %x!",op);
1579         return;
1580       }
1581       if(is_zero(-1)) {
1582         vswap();
1583         switch(op) {
1584           case TOK_LT: op=TOK_GT; break;
1585           case TOK_GE: op=TOK_ULE; break;
1586           case TOK_LE: op=TOK_GE; break;
1587           case TOK_GT: op=TOK_ULT; break;
1588         }
1589       }
1590       x|=0xB40040; /* fcmpX */
1591       if(op!=TOK_EQ && op!=TOK_NE)
1592         x|=0x80; /* fcmpX -> fcmpeX */
1593       if(is_zero(0)) {
1594         vtop--;
1595         o(x|0x10000|(vfpr(gv(RC_FLOAT))<<12)); /* fcmp(e)X -> fcmp(e)zX */
1596       } else {
1597         x|=vfpr(gv(RC_FLOAT));
1598         vswap();
1599         o(x|(vfpr(gv(RC_FLOAT))<<12));
1600         vtop--;
1601       }
1602       o(0xEEF1FA10); /* fmstat */
1603
1604       switch(op) {
1605         case TOK_LE: op=TOK_ULE; break;
1606         case TOK_LT: op=TOK_ULT; break;
1607         case TOK_UGE: op=TOK_GE; break;
1608         case TOK_UGT: op=TOK_GT; break;
1609       }
1610
1611       vtop->r = VT_CMP;
1612       vtop->c.i = op;
1613       return;
1614   }
1615   r=gv(RC_FLOAT);
1616   x|=vfpr(r);
1617   r=regmask(r);
1618   if(!fneg) {
1619     int r2;
1620     vswap();
1621     r2=gv(RC_FLOAT);
1622     x|=vfpr(r2)<<16;
1623     r|=regmask(r2);
1624   }
1625   vtop->r=get_reg_ex(RC_FLOAT,r);
1626   if(!fneg)
1627     vtop--;
1628   o(x|(vfpr(vtop->r)<<12));
1629 }
1630
1631 #else
1632 static uint32_t is_fconst()
1633 {
1634   long double f;
1635   uint32_t r;
1636   if((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
1637     return 0;
1638   if (vtop->type.t == VT_FLOAT)
1639     f = vtop->c.f;
1640   else if (vtop->type.t == VT_DOUBLE)
1641     f = vtop->c.d;
1642   else
1643     f = vtop->c.ld;
1644   if(!ieee_finite(f))
1645     return 0;
1646   r=0x8;
1647   if(f<0.0) {
1648     r=0x18;
1649     f=-f;
1650   }
1651   if(f==0.0)
1652     return r;
1653   if(f==1.0)
1654     return r|1;
1655   if(f==2.0)
1656     return r|2;
1657   if(f==3.0)
1658     return r|3;
1659   if(f==4.0)
1660     return r|4;
1661   if(f==5.0)
1662     return r|5;
1663   if(f==0.5)
1664     return r|6;
1665   if(f==10.0)
1666     return r|7;
1667   return 0;
1668 }
1669
1670 /* generate a floating point operation 'v = t1 op t2' instruction. The
1671    two operands are guaranted to have the same floating point type */
1672 void gen_opf(int op)
1673 {
1674   uint32_t x, r, r2, c1, c2;
1675   //fputs("gen_opf\n",stderr);
1676   vswap();
1677   c1 = is_fconst();
1678   vswap();
1679   c2 = is_fconst();
1680   x=0xEE000100;
1681 #if LDOUBLE_SIZE == 8
1682   if ((vtop->type.t & VT_BTYPE) != VT_FLOAT)
1683     x|=0x80;
1684 #else
1685   if ((vtop->type.t & VT_BTYPE) == VT_DOUBLE)
1686     x|=0x80;
1687   else if ((vtop->type.t & VT_BTYPE) == VT_LDOUBLE)
1688     x|=0x80000;
1689 #endif
1690   switch(op)
1691   {
1692     case '+':
1693       if(!c2) {
1694         vswap();
1695         c2=c1;
1696       }
1697       vswap();
1698       r=fpr(gv(RC_FLOAT));
1699       vswap();
1700       if(c2) {
1701         if(c2>0xf)
1702           x|=0x200000; // suf
1703         r2=c2&0xf;
1704       } else {
1705         r2=fpr(gv(RC_FLOAT));
1706       }
1707       break;
1708     case '-':
1709       if(c2) {
1710         if(c2<=0xf)
1711           x|=0x200000; // suf
1712         r2=c2&0xf;
1713         vswap();
1714         r=fpr(gv(RC_FLOAT));
1715         vswap();
1716       } else if(c1 && c1<=0xf) {
1717         x|=0x300000; // rsf
1718         r2=c1;
1719         r=fpr(gv(RC_FLOAT));
1720         vswap();
1721       } else {
1722         x|=0x200000; // suf
1723         vswap();
1724         r=fpr(gv(RC_FLOAT));
1725         vswap();
1726         r2=fpr(gv(RC_FLOAT));
1727       }
1728       break;
1729     case '*':
1730       if(!c2 || c2>0xf) {
1731         vswap();
1732         c2=c1;
1733       }
1734       vswap();
1735       r=fpr(gv(RC_FLOAT));
1736       vswap();
1737       if(c2 && c2<=0xf)
1738         r2=c2;
1739       else
1740         r2=fpr(gv(RC_FLOAT));
1741       x|=0x100000; // muf
1742       break;
1743     case '/':
1744       if(c2 && c2<=0xf) {
1745         x|=0x400000; // dvf
1746         r2=c2;
1747         vswap();
1748         r=fpr(gv(RC_FLOAT));
1749         vswap();
1750       } else if(c1 && c1<=0xf) {
1751         x|=0x500000; // rdf
1752         r2=c1;
1753         r=fpr(gv(RC_FLOAT));
1754         vswap();
1755       } else {
1756         x|=0x400000; // dvf
1757         vswap();
1758         r=fpr(gv(RC_FLOAT));
1759         vswap();
1760         r2=fpr(gv(RC_FLOAT));
1761       }
1762       break;
1763     default:
1764       if(op >= TOK_ULT && op <= TOK_GT) {
1765         x|=0xd0f110; // cmfe
1766 /* bug (intention?) in Linux FPU emulator
1767    doesn't set carry if equal */
1768         switch(op) {
1769           case TOK_ULT:
1770           case TOK_UGE:
1771           case TOK_ULE:
1772           case TOK_UGT:
1773             tcc_error("unsigned comparision on floats?");
1774             break;
1775           case TOK_LT:
1776             op=TOK_Nset;
1777             break;
1778           case TOK_LE:
1779             op=TOK_ULE; /* correct in unordered case only if AC bit in FPSR set */
1780             break;
1781           case TOK_EQ:
1782           case TOK_NE:
1783             x&=~0x400000; // cmfe -> cmf
1784             break;
1785         }
1786         if(c1 && !c2) {
1787           c2=c1;
1788           vswap();
1789           switch(op) {
1790             case TOK_Nset:
1791               op=TOK_GT;
1792               break;
1793             case TOK_GE:
1794               op=TOK_ULE;
1795               break;
1796             case TOK_ULE:
1797               op=TOK_GE;
1798               break;
1799             case TOK_GT:
1800               op=TOK_Nset;
1801               break;
1802           }
1803         }
1804         vswap();
1805         r=fpr(gv(RC_FLOAT));
1806         vswap();
1807         if(c2) {
1808           if(c2>0xf)
1809             x|=0x200000;
1810           r2=c2&0xf;
1811         } else {
1812           r2=fpr(gv(RC_FLOAT));
1813         }
1814         vtop[-1].r = VT_CMP;
1815         vtop[-1].c.i = op;
1816       } else {
1817         tcc_error("unknown fp op %x!",op);
1818         return;
1819       }
1820   }
1821   if(vtop[-1].r == VT_CMP)
1822     c1=15;
1823   else {
1824     c1=vtop->r;
1825     if(r2&0x8)
1826       c1=vtop[-1].r;
1827     vtop[-1].r=get_reg_ex(RC_FLOAT,two2mask(vtop[-1].r,c1));
1828     c1=fpr(vtop[-1].r);
1829   }
1830   vtop--;
1831   o(x|(r<<16)|(c1<<12)|r2);
1832 }
1833 #endif
1834
1835 /* convert integers to fp 't' type. Must handle 'int', 'unsigned int'
1836    and 'long long' cases. */
1837 ST_FUNC void gen_cvt_itof1(int t)
1838 {
1839   uint32_t r, r2;
1840   int bt;
1841   bt=vtop->type.t & VT_BTYPE;
1842   if(bt == VT_INT || bt == VT_SHORT || bt == VT_BYTE) {
1843 #ifndef TCC_ARM_VFP
1844     uint32_t dsize = 0;
1845 #endif
1846     r=intr(gv(RC_INT));
1847 #ifdef TCC_ARM_VFP
1848     r2=vfpr(vtop->r=get_reg(RC_FLOAT));
1849     o(0xEE000A10|(r<<12)|(r2<<16)); /* fmsr */
1850     r2<<=12;
1851     if(!(vtop->type.t & VT_UNSIGNED))
1852       r2|=0x80;                /* fuitoX -> fsituX */
1853     o(0xEEB80A40|r2|T2CPR(t)); /* fYitoX*/
1854 #else
1855     r2=fpr(vtop->r=get_reg(RC_FLOAT));
1856     if((t & VT_BTYPE) != VT_FLOAT)
1857       dsize=0x80;    /* flts -> fltd */
1858     o(0xEE000110|dsize|(r2<<16)|(r<<12)); /* flts */
1859     if((vtop->type.t & (VT_UNSIGNED|VT_BTYPE)) == (VT_UNSIGNED|VT_INT)) {
1860       uint32_t off = 0;
1861       o(0xE3500000|(r<<12));        /* cmp */
1862       r=fpr(get_reg(RC_FLOAT));
1863       if(last_itod_magic) {
1864         off=ind+8-last_itod_magic;
1865         off/=4;
1866         if(off>255)
1867           off=0;
1868       }
1869       o(0xBD1F0100|(r<<12)|off);    /* ldflts */
1870       if(!off) {
1871         o(0xEA000000);              /* b */
1872         last_itod_magic=ind;
1873         o(0x4F800000);              /* 4294967296.0f */
1874       }
1875       o(0xBE000100|dsize|(r2<<16)|(r2<<12)|r); /* adflt */
1876     }
1877 #endif
1878     return;
1879   } else if(bt == VT_LLONG) {
1880     int func;
1881     CType *func_type = 0;
1882     if((t & VT_BTYPE) == VT_FLOAT) {
1883       func_type = &func_float_type;
1884       if(vtop->type.t & VT_UNSIGNED)
1885         func=TOK___floatundisf;
1886       else
1887         func=TOK___floatdisf;
1888 #if LDOUBLE_SIZE != 8
1889     } else if((t & VT_BTYPE) == VT_LDOUBLE) {
1890       func_type = &func_ldouble_type;
1891       if(vtop->type.t & VT_UNSIGNED)
1892         func=TOK___floatundixf;
1893       else
1894         func=TOK___floatdixf;
1895     } else if((t & VT_BTYPE) == VT_DOUBLE) {
1896 #else
1897     } else if((t & VT_BTYPE) == VT_DOUBLE || (t & VT_BTYPE) == VT_LDOUBLE) {
1898 #endif
1899       func_type = &func_double_type;
1900       if(vtop->type.t & VT_UNSIGNED)
1901         func=TOK___floatundidf;
1902       else
1903         func=TOK___floatdidf;
1904     }
1905     if(func_type) {
1906       vpush_global_sym(func_type, func);
1907       vswap();
1908       gfunc_call(1);
1909       vpushi(0);
1910       vtop->r=TREG_F0;
1911       return;
1912     }
1913   }
1914   tcc_error("unimplemented gen_cvt_itof %x!",vtop->type.t);
1915 }
1916
1917 /* convert fp to int 't' type */
1918 void gen_cvt_ftoi(int t)
1919 {
1920   uint32_t r, r2;
1921   int u, func = 0;
1922   u=t&VT_UNSIGNED;
1923   t&=VT_BTYPE;
1924   r2=vtop->type.t & VT_BTYPE;
1925   if(t==VT_INT) {
1926 #ifdef TCC_ARM_VFP
1927     r=vfpr(gv(RC_FLOAT));
1928     u=u?0:0x10000;
1929     o(0xEEBC0A40|(r<<12)|r|T2CPR(r2)); /* ftoXiY */
1930     r2=intr(vtop->r=get_reg(RC_INT));
1931     o(0xEE100A10|(r<<16)|(r2<<12));
1932     return;
1933 #else
1934     if(u) {
1935       if(r2 == VT_FLOAT)
1936         func=TOK___fixunssfsi;
1937 #if LDOUBLE_SIZE != 8
1938       else if(r2 == VT_LDOUBLE)
1939         func=TOK___fixunsxfsi;
1940       else if(r2 == VT_DOUBLE)
1941 #else
1942       else if(r2 == VT_LDOUBLE || r2 == VT_DOUBLE)
1943 #endif
1944         func=TOK___fixunsdfsi;
1945     } else {
1946       r=fpr(gv(RC_FLOAT));
1947       r2=intr(vtop->r=get_reg(RC_INT));
1948       o(0xEE100170|(r2<<12)|r);
1949       return;
1950     }
1951 #endif
1952   } else if(t == VT_LLONG) { // unsigned handled in gen_cvt_ftoi1
1953     if(r2 == VT_FLOAT)
1954       func=TOK___fixsfdi;
1955 #if LDOUBLE_SIZE != 8
1956     else if(r2 == VT_LDOUBLE)
1957       func=TOK___fixxfdi;
1958     else if(r2 == VT_DOUBLE)
1959 #else
1960     else if(r2 == VT_LDOUBLE || r2 == VT_DOUBLE)
1961 #endif
1962       func=TOK___fixdfdi;
1963   }
1964   if(func) {
1965     vpush_global_sym(&func_old_type, func);
1966     vswap();
1967     gfunc_call(1);
1968     vpushi(0);
1969     if(t == VT_LLONG)
1970       vtop->r2 = REG_LRET;
1971     vtop->r = REG_IRET;
1972     return;
1973   }
1974   tcc_error("unimplemented gen_cvt_ftoi!");
1975 }
1976
1977 /* convert from one floating point type to another */
1978 void gen_cvt_ftof(int t)
1979 {
1980 #ifdef TCC_ARM_VFP
1981   if(((vtop->type.t & VT_BTYPE) == VT_FLOAT) != ((t & VT_BTYPE) == VT_FLOAT)) {
1982     uint32_t r = vfpr(gv(RC_FLOAT));
1983     o(0xEEB70AC0|(r<<12)|r|T2CPR(vtop->type.t));
1984   }
1985 #else
1986   /* all we have to do on i386 and FPA ARM is to put the float in a register */
1987   gv(RC_FLOAT);
1988 #endif
1989 }
1990
1991 /* computed goto support */
1992 void ggoto(void)
1993 {
1994   gcall_or_jmp(1);
1995   vtop--;
1996 }
1997
1998 /* end of ARM code generator */
1999 /*************************************************************/
2000 #endif
2001 /*************************************************************/