1 ; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding 2 ; version for AMD64 on Windows using Microsoft C compiler 3 ; 4 ; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c 5 ; inffasx64.asm is called by inffas8664.c, which contain more info. 6 7 8 ; to compile this file, I use option 9 ; ml64.exe /Flinffasx64 /c /Zi inffasx64.asm 10 ; with Microsoft Macro Assembler (x64) for AMD64 11 ; 12 13 ; This file compile with Microsoft Macro Assembler (x64) for AMD64 14 ; 15 ; ml64.exe is given with Visual Studio 2005/2008/2010 and Windows WDK 16 ; 17 ; (you can get Windows WDK with ml64 for AMD64 from 18 ; http://www.microsoft.com/whdc/Devtools/wdk/default.mspx for low price) 19 ; 20 21 22 .code 23 inffas8664fnc PROC 24 25 ; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and 26 ; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp 27 ; 28 ; All registers must be preserved across the call, except for 29 ; rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch. 30 31 32 mov [rsp-8],rsi 33 mov [rsp-16],rdi 34 mov [rsp-24],r12 35 mov [rsp-32],r13 36 mov [rsp-40],r14 37 mov [rsp-48],r15 38 mov [rsp-56],rbx 39 40 mov rax,rcx 41 42 mov [rax+8], rbp ; /* save regs rbp and rsp */ 43 mov [rax], rsp 44 45 mov rsp, rax ; /* make rsp point to &ar */ 46 47 mov rsi, [rsp+16] ; /* rsi = in */ 48 mov rdi, [rsp+32] ; /* rdi = out */ 49 mov r9, [rsp+24] ; /* r9 = last */ 50 mov r10, [rsp+48] ; /* r10 = end */ 51 mov rbp, [rsp+64] ; /* rbp = lcode */ 52 mov r11, [rsp+72] ; /* r11 = dcode */ 53 mov rdx, [rsp+80] ; /* rdx = hold */ 54 mov ebx, [rsp+88] ; /* ebx = bits */ 55 mov r12d, [rsp+100] ; /* r12d = lmask */ 56 mov r13d, [rsp+104] ; /* r13d = dmask */ 57 ; /* r14d = len */ 58 ; /* r15d = dist */ 59 60 61 cld 62 cmp r10, rdi 63 je L_one_time ; /* if only one decode left */ 64 cmp r9, rsi 65 66 jne L_do_loop 67 68 69 L_one_time: 70 mov r8, r12 ; /* r8 = lmask */ 71 cmp bl, 32 72 ja L_get_length_code_one_time 73 74 lodsd ; /* eax = *(uint *)in++ */ 75 mov cl, bl ; /* cl = bits, needs it for shifting */ 76 add bl, 32 ; /* bits += 32 */ 77 shl rax, cl 78 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ 79 jmp L_get_length_code_one_time 80 81 ALIGN 4 82 L_while_test: 83 cmp r10, rdi 84 jbe L_break_loop 85 cmp r9, rsi 86 jbe L_break_loop 87 88 L_do_loop: 89 mov r8, r12 ; /* r8 = lmask */ 90 cmp bl, 32 91 ja L_get_length_code ; /* if (32 < bits) */ 92 93 lodsd ; /* eax = *(uint *)in++ */ 94 mov cl, bl ; /* cl = bits, needs it for shifting */ 95 add bl, 32 ; /* bits += 32 */ 96 shl rax, cl 97 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ 98 99 L_get_length_code: 100 and r8, rdx ; /* r8 &= hold */ 101 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */ 102 103 mov cl, ah ; /* cl = this.bits */ 104 sub bl, ah ; /* bits -= this.bits */ 105 shr rdx, cl ; /* hold >>= this.bits */ 106 107 test al, al 108 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */ 109 110 mov r8, r12 ; /* r8 = lmask */ 111 shr eax, 16 ; /* output this.val char */ 112 stosb 113 114 L_get_length_code_one_time: 115 and r8, rdx ; /* r8 &= hold */ 116 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */ 117 118 L_dolen: 119 mov cl, ah ; /* cl = this.bits */ 120 sub bl, ah ; /* bits -= this.bits */ 121 shr rdx, cl ; /* hold >>= this.bits */ 122 123 test al, al 124 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */ 125 126 shr eax, 16 ; /* output this.val char */ 127 stosb 128 jmp L_while_test 129 130 ALIGN 4 131 L_test_for_length_base: 132 mov r14d, eax ; /* len = this */ 133 shr r14d, 16 ; /* len = this.val */ 134 mov cl, al 135 136 test al, 16 137 jz L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */ 138 and cl, 15 ; /* op &= 15 */ 139 jz L_decode_distance ; /* if (!op) */ 140 141 L_add_bits_to_len: 142 sub bl, cl 143 xor eax, eax 144 inc eax 145 shl eax, cl 146 dec eax 147 and eax, edx ; /* eax &= hold */ 148 shr rdx, cl 149 add r14d, eax ; /* len += hold & mask[op] */ 150 151 L_decode_distance: 152 mov r8, r13 ; /* r8 = dmask */ 153 cmp bl, 32 154 ja L_get_distance_code ; /* if (32 < bits) */ 155 156 lodsd ; /* eax = *(uint *)in++ */ 157 mov cl, bl ; /* cl = bits, needs it for shifting */ 158 add bl, 32 ; /* bits += 32 */ 159 shl rax, cl 160 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */ 161 162 L_get_distance_code: 163 and r8, rdx ; /* r8 &= hold */ 164 mov eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */ 165 166 L_dodist: 167 mov r15d, eax ; /* dist = this */ 168 shr r15d, 16 ; /* dist = this.val */ 169 mov cl, ah 170 sub bl, ah ; /* bits -= this.bits */ 171 shr rdx, cl ; /* hold >>= this.bits */ 172 mov cl, al ; /* cl = this.op */ 173 174 test al, 16 ; /* if ((op & 16) == 0) */ 175 jz L_test_for_second_level_dist 176 and cl, 15 ; /* op &= 15 */ 177 jz L_check_dist_one 178 179 L_add_bits_to_dist: 180 sub bl, cl 181 xor eax, eax 182 inc eax 183 shl eax, cl 184 dec eax ; /* (1 << op) - 1 */ 185 and eax, edx ; /* eax &= hold */ 186 shr rdx, cl 187 add r15d, eax ; /* dist += hold & ((1 << op) - 1) */ 188 189 L_check_window: 190 mov r8, rsi ; /* save in so from can use it's reg */ 191 mov rax, rdi 192 sub rax, [rsp+40] ; /* nbytes = out - beg */ 193 194 cmp eax, r15d 195 jb L_clip_window ; /* if (dist > nbytes) 4.2% */ 196 197 mov ecx, r14d ; /* ecx = len */ 198 mov rsi, rdi 199 sub rsi, r15 ; /* from = out - dist */ 200 201 sar ecx, 1 202 jnc L_copy_two ; /* if len % 2 == 0 */ 203 204 rep movsw 205 mov al, [rsi] 206 mov [rdi], al 207 inc rdi 208 209 mov rsi, r8 ; /* move in back to %rsi, toss from */ 210 jmp L_while_test 211 212 L_copy_two: 213 rep movsw 214 mov rsi, r8 ; /* move in back to %rsi, toss from */ 215 jmp L_while_test 216 217 ALIGN 4 218 L_check_dist_one: 219 cmp r15d, 1 ; /* if dist 1, is a memset */ 220 jne L_check_window 221 cmp [rsp+40], rdi ; /* if out == beg, outside window */ 222 je L_check_window 223 224 mov ecx, r14d ; /* ecx = len */ 225 mov al, [rdi-1] 226 mov ah, al 227 228 sar ecx, 1 229 jnc L_set_two 230 mov [rdi], al 231 inc rdi 232 233 L_set_two: 234 rep stosw 235 jmp L_while_test 236 237 ALIGN 4 238 L_test_for_second_level_length: 239 test al, 64 240 jnz L_test_for_end_of_block ; /* if ((op & 64) != 0) */ 241 242 xor eax, eax 243 inc eax 244 shl eax, cl 245 dec eax 246 and eax, edx ; /* eax &= hold */ 247 add eax, r14d ; /* eax += len */ 248 mov eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/ 249 jmp L_dolen 250 251 ALIGN 4 252 L_test_for_second_level_dist: 253 test al, 64 254 jnz L_invalid_distance_code ; /* if ((op & 64) != 0) */ 255 256 xor eax, eax 257 inc eax 258 shl eax, cl 259 dec eax 260 and eax, edx ; /* eax &= hold */ 261 add eax, r15d ; /* eax += dist */ 262 mov eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/ 263 jmp L_dodist 264 265 ALIGN 4 266 L_clip_window: 267 mov ecx, eax ; /* ecx = nbytes */ 268 mov eax, [rsp+92] ; /* eax = wsize, prepare for dist cmp */ 269 neg ecx ; /* nbytes = -nbytes */ 270 271 cmp eax, r15d 272 jb L_invalid_distance_too_far ; /* if (dist > wsize) */ 273 274 add ecx, r15d ; /* nbytes = dist - nbytes */ 275 cmp dword ptr [rsp+96], 0 276 jne L_wrap_around_window ; /* if (write != 0) */ 277 278 mov rsi, [rsp+56] ; /* from = window */ 279 sub eax, ecx ; /* eax -= nbytes */ 280 add rsi, rax ; /* from += wsize - nbytes */ 281 282 mov eax, r14d ; /* eax = len */ 283 cmp r14d, ecx 284 jbe L_do_copy ; /* if (nbytes >= len) */ 285 286 sub eax, ecx ; /* eax -= nbytes */ 287 rep movsb 288 mov rsi, rdi 289 sub rsi, r15 ; /* from = &out[ -dist ] */ 290 jmp L_do_copy 291 292 ALIGN 4 293 L_wrap_around_window: 294 mov eax, [rsp+96] ; /* eax = write */ 295 cmp ecx, eax 296 jbe L_contiguous_in_window ; /* if (write >= nbytes) */ 297 298 mov esi, [rsp+92] ; /* from = wsize */ 299 add rsi, [rsp+56] ; /* from += window */ 300 add rsi, rax ; /* from += write */ 301 sub rsi, rcx ; /* from -= nbytes */ 302 sub ecx, eax ; /* nbytes -= write */ 303 304 mov eax, r14d ; /* eax = len */ 305 cmp eax, ecx 306 jbe L_do_copy ; /* if (nbytes >= len) */ 307 308 sub eax, ecx ; /* len -= nbytes */ 309 rep movsb 310 mov rsi, [rsp+56] ; /* from = window */ 311 mov ecx, [rsp+96] ; /* nbytes = write */ 312 cmp eax, ecx 313 jbe L_do_copy ; /* if (nbytes >= len) */ 314 315 sub eax, ecx ; /* len -= nbytes */ 316 rep movsb 317 mov rsi, rdi 318 sub rsi, r15 ; /* from = out - dist */ 319 jmp L_do_copy 320 321 ALIGN 4 322 L_contiguous_in_window: 323 mov rsi, [rsp+56] ; /* rsi = window */ 324 add rsi, rax 325 sub rsi, rcx ; /* from += write - nbytes */ 326 327 mov eax, r14d ; /* eax = len */ 328 cmp eax, ecx 329 jbe L_do_copy ; /* if (nbytes >= len) */ 330 331 sub eax, ecx ; /* len -= nbytes */ 332 rep movsb 333 mov rsi, rdi 334 sub rsi, r15 ; /* from = out - dist */ 335 jmp L_do_copy ; /* if (nbytes >= len) */ 336 337 ALIGN 4 338 L_do_copy: 339 mov ecx, eax ; /* ecx = len */ 340 rep movsb 341 342 mov rsi, r8 ; /* move in back to %esi, toss from */ 343 jmp L_while_test 344 345 L_test_for_end_of_block: 346 test al, 32 347 jz L_invalid_literal_length_code 348 mov dword ptr [rsp+116], 1 349 jmp L_break_loop_with_status 350 351 L_invalid_literal_length_code: 352 mov dword ptr [rsp+116], 2 353 jmp L_break_loop_with_status 354 355 L_invalid_distance_code: 356 mov dword ptr [rsp+116], 3 357 jmp L_break_loop_with_status 358 359 L_invalid_distance_too_far: 360 mov dword ptr [rsp+116], 4 361 jmp L_break_loop_with_status 362 363 L_break_loop: 364 mov dword ptr [rsp+116], 0 365 366 L_break_loop_with_status: 367 ; /* put in, out, bits, and hold back into ar and pop esp */ 368 mov [rsp+16], rsi ; /* in */ 369 mov [rsp+32], rdi ; /* out */ 370 mov [rsp+88], ebx ; /* bits */ 371 mov [rsp+80], rdx ; /* hold */ 372 373 mov rax, [rsp] ; /* restore rbp and rsp */ 374 mov rbp, [rsp+8] 375 mov rsp, rax 376 377 378 379 mov rsi,[rsp-8] 380 mov rdi,[rsp-16] 381 mov r12,[rsp-24] 382 mov r13,[rsp-32] 383 mov r14,[rsp-40] 384 mov r15,[rsp-48] 385 mov rbx,[rsp-56] 386 387 ret 0 388 ; : 389 ; : "m" (ar) 390 ; : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi", 391 ; "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" 392 ; ); 393 394 inffas8664fnc ENDP 395 ;_TEXT ENDS 396 END 397
