/usr/lib/bcc/rules.386 is in elks-libc 0.16.17-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 | # Rules to optimize BCC assembler output for 386
# Many of these rules are very broken, ho hum.
# Rules for loading a long constant
xor ax,ax
xor %[bx|si|di]1,%[bx|si|di]1
=
xor eax,eax
xor eax,eax
mov %[ebx|ecx|edx]1,eax
=
xor %1,%1
xor ax,ax
mov %[bx|si|di]*,%[*|#]0%1
=
mov eax,%0%1<<16
mov ax,%[*|#]0%1
xor %[bx|si|di]2,%[bx|si|di]2
=
mov eax,%0%1 & $0000FFFF
mov ax,%0[%1]
xor %[bx|si|di]2,%[bx|si|di]2
=
movzx eax,word ptr %0[%1]
mov ax,%[si|di]1
xor bx,bx
=
movzx eax,%1
%[movzx|movsx]5 eax,%1
mov %[ebx|ecx|edx]2,eax
=
%5 %2,%1
%[movzx|movsx]5 %[ebx|ecx|edx]1,%2
mov eax,%[#|*]0%3
%[add|and|xor|or]4 eax,%[ebx|ecx|edx]1
=
%5 eax,%2
%4 eax,%0%3
mov ax,%0[%1]
cwde
=
movsx eax,word ptr %0[%1]
mov ax,%[si|di]1
cwde
=
movsx eax,%1
mov ax,%[#|*]3%1
mov %[bx|si|di]*,%[#|*]4%2
=
mov eax,%4%2<<16 + %1
# Rules for pushing variables and constants onto the stack
push %![dword ptr]%1[%[bx|si|di|bp]3]
push %![dword ptr]%(%1-2)[%[bx|si|di|bp]3]
=
push dword ptr %(%1-2)[%3]
push [%1+2]
push [%1]
=
push dword ptr [%1]
push %[bx|si|di]*
push ax
=
push eax
mov eax,%[#|*]0%1
push eax
=
push dword %0%1
mov %1,%[eax|ebx|ecx|edx]2
push dword ptr %1
=
mov %1,%2
push %2
# Rules for loading long variables
mov ax,[%1]
mov %[bx|si|di]*,[%1+2]
=
mov eax,[%1]
mov ax,%1[%[bx|si|di|bp]3]
mov %[bx|si|di]*,%(%1+2)[%[bx|si|di|bp]3]
=
mov eax,%1[%3]
mov ax,#%1[bx]
mov %[bx|si|di]*,#%1+2[bx]
=
mov eax,#%1[bx]
mov [%1],ax
mov [%1+2],%[bx|si|di]*
=
mov [%1],eax
mov [%1+%3],ax
mov [%1+%(%3+2)],%[bx|si|di]*
=
mov [%1+%3],eax
mov %1[%[si|di|bp]3],ax
mov %(%1+2)[%[si|di|bp]3],%[bx|si|di]*
=
mov %1[%3],eax
mov #%1[bx],ax
mov #%1+2[bx],%[bx|si|di]*
=
mov #%1[bx],eax
mov eax,%[#|*]0%1
mov %![dword ptr]%3[%2],eax
=
mov dword ptr %3[%2],%0%1
xor ax,ax
xor %[bx|si|di]3,%[bx|si|di]3
mov %1[%[bx|bp]4],ax
mov %(%1+2)[%[bx|bp]4],%[bx|si|di]3
=
mov dword ptr %1[%4],#0
mov ax,%1
mov %[bx|si|di]5,%2
mov %3[%[bx|bp]6],ax
mov %(%3+2)[%[bx|bp]6],%[bx|si|di]5
=
mov eax,dword ptr %1
mov dword ptr %3[%6],eax
# Long return values are in EAX, so we can skip dx
mov dx,bx
add sp,*%1
=
add sp,*%1
# Rules for manipulating long values
call %1
mov bx,dx
=
call %1
call l%[tstu|tst]*l
=
test eax,eax
call l%[comu|com]*l
=
not eax
mov eax,eax
%1
=
%1
mov %2,%[eax|ebx|ecx|edx]1
mov %[eax|ebx|ecx|edx]1,%2
=
mov %2,%1
cwd
mov bx,dx
=
cwde
mov %[ebx|ecx|edx]0,%1
mov eax,%2
%3 eax,%[ebc|ecx|edx]0
=
mov eax,%2
%3 eax,%1
%[movzx|movsx|mov]0 %[eax|ebx|ecx|edx]2,%4
%[add|and|xor|sub|or]1 %[eax|ebx|ecx|edx]2,%6
mov %6,%[eax|ebx|ecx|edx]2
=
%0 %2,%4
%1 %6,%2
mov eax,%[#|*]0%1
cmp eax,%2
%[jbe |jae |jne |jge |jle ]3 %4
=
cmp dword ptr %2,%0%1
%=[jbe |jae |jne |jge |jle ][jae |jbe |jne |jle |jge ]3 %4
mov eax,%[#|*]0%1
cmp eax,%2
%[jb |ja |je |jg |jl ]3 %4
=
cmp dword ptr %2,%0%1
%=[jb |ja |je |jg |jl ][ja |jb |je |jl |jg ]3 %4
mov eax,%1[%3]
cmp eax,dword %[#|*]0%2
=
cmp dword ptr %1[%3],%0%2
# Rules for calling the bcc library routines.
push %1
push %2
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
add sp,*8
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
mov eax,%2
push eax
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
add sp,*8
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
xor eax,eax
push eax
mov eax,%2[bp]
%3 eax,%(%2-4)[bp]
add sp,*8
=
mov eax,%1
%3 eax,#0
push %1
mov eax,%2
%3 eax,%4[bp]
add sp,*4
=
mov edx,%1
mov eax,%2
%3 eax,edx
push %1
mov eax,%2
%3 eax,%4[bp]
mov %2,eax
add sp,*4
=
mov edx,%1
%3 %2,edx
push %1
push %2
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
lea sp,%(%3+4)[bp]
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
mov eax,%2
push eax
mov eax,%3[bp]
%4 eax,%(%3-4)[bp]
lea sp,%(%3+4)[bp]
=
mov edx,%2
mov eax,%1
%4 eax,edx
push %1
xor eax,eax
push eax
mov eax,%2[bp]
%3 eax,%(%2-4)[bp]
lea sp,%(%2+4)[bp]
=
mov eax,%1
%3 eax,#0
push %1
mov eax,%2
%3 eax,%4[bp]
lea sp,%(%4+4)[bp]
=
mov edx,%1
mov eax,%2
%3 eax,edx
# Rules for calling the basic bcc library routines.
mov di,#%2
call l%3%[ul|l]*
=
%3 eax,[%2]
mov di,*%2
call lsll
=
lsl eax,*%2
lea di,%2
call l%3%[ul|l]*
=
%3 eax,%2
mov di,%[si|di]1
call l%3%[ul|l]*
=
%3 eax,[%1]
mov di,%[ax|bx|cx|dx]1
call l%3%[ul|l]*
=
mov di,%[ax|bx|cx|dx]1
%3 eax,[di]
# Rules for pushing short values
mov %[ax|bx|cx|dx|si|di]2,%0[%1]
push %[ax|bx|cx|dx|si|di]2
=
push word ptr %0[%1]
mov %[ax|bx|cx|dx|si|di]2,%[#|*]0%1
push %[ax|bx|cx|dx|si|di]2
=
push %0%1
# Shifting rules
%[shl|shr]2 %1,*1
%[shl|shr]2 %1,*1
=
%2 %1,*2
mov cl,*%1
%[shl|shr]2 %3,cl
=
%2 %3,*%1
mov dx,ax
shl ax,*%1
add ax,dx
shl ax,*%2
=
mov dx,ax
imul ax,*%(1<%1+1<%2)
mov dx,ax
imul ax,*%1
add ax,dx
=
mov dx,ax
imul ax,*%(%1+1)
mov dx,ax
imul ax,*%1
shl ax,*%2
=
mov dx,ax
imul ax,*%(%1<%2)
mov ax,%![#|*]%4
mov dx,ax
imul ax,*%1
%[add|and|xor|sub|or]2 ax,%![dx]%3
=
imul ax,%4,*%1
%2 ax,%3
mov ax,%![#|*]%4
mov dx,ax
imul ax,*%1
push ax
=
imul ax,%4,*%1
push ax
imul ax,%2,%[#|*]0%1
add ax,%3
mov bx,ax
=
imul bx,%2,%0%1
add bx,%3
# Different rules
%1 dword ptr %[eax|ebx|ecx|edx]3,*%2
=
%1 %3,*%2
%1 dword ptr %[eax|ebx|ecx|edx]3,#%2
=
%1 %3,#%2
eor %1,%2
=
xor %1,%2
com %1
=
not %1
xor bx,bx
=
and eax,#$0000FFFF
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