1 ; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
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2 ; version for AMD64 on Windows using Microsoft C compiler
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4 ; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
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5 ; inffasx64.asm is called by inffas8664.c, which contain more info.
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8 ; to compile this file, I use option
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9 ; ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
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10 ; with Microsoft Macro Assembler (x64) for AMD64
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12 ; ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
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14 ; (you can get Windows 2003 server DDK with ml64 and cl.exe for AMD64 from
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15 ; http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)
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21 ; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
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22 ; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
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24 ; All registers must be preserved across the call, except for
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25 ; rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
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38 mov [rax+8], rbp ; /* save regs rbp and rsp */
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41 mov rsp, rax ; /* make rsp point to &ar */
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43 mov rsi, [rsp+16] ; /* rsi = in */
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44 mov rdi, [rsp+32] ; /* rdi = out */
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45 mov r9, [rsp+24] ; /* r9 = last */
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46 mov r10, [rsp+48] ; /* r10 = end */
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47 mov rbp, [rsp+64] ; /* rbp = lcode */
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48 mov r11, [rsp+72] ; /* r11 = dcode */
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49 mov rdx, [rsp+80] ; /* rdx = hold */
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50 mov ebx, [rsp+88] ; /* ebx = bits */
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51 mov r12d, [rsp+100] ; /* r12d = lmask */
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52 mov r13d, [rsp+104] ; /* r13d = dmask */
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59 je L_one_time ; /* if only one decode left */
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66 mov r8, r12 ; /* r8 = lmask */
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68 ja L_get_length_code_one_time
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70 lodsd ; /* eax = *(uint *)in++ */
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71 mov cl, bl ; /* cl = bits, needs it for shifting */
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72 add bl, 32 ; /* bits += 32 */
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74 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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75 jmp L_get_length_code_one_time
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85 mov r8, r12 ; /* r8 = lmask */
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87 ja L_get_length_code ; /* if (32 < bits) */
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89 lodsd ; /* eax = *(uint *)in++ */
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90 mov cl, bl ; /* cl = bits, needs it for shifting */
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91 add bl, 32 ; /* bits += 32 */
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93 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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96 and r8, rdx ; /* r8 &= hold */
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97 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
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99 mov cl, ah ; /* cl = this.bits */
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100 sub bl, ah ; /* bits -= this.bits */
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101 shr rdx, cl ; /* hold >>= this.bits */
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104 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
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106 mov r8, r12 ; /* r8 = lmask */
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107 shr eax, 16 ; /* output this.val char */
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110 L_get_length_code_one_time:
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111 and r8, rdx ; /* r8 &= hold */
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112 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
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115 mov cl, ah ; /* cl = this.bits */
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116 sub bl, ah ; /* bits -= this.bits */
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117 shr rdx, cl ; /* hold >>= this.bits */
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120 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
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122 shr eax, 16 ; /* output this.val char */
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127 L_test_for_length_base:
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128 mov r14d, eax ; /* len = this */
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129 shr r14d, 16 ; /* len = this.val */
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133 jz L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
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134 and cl, 15 ; /* op &= 15 */
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135 jz L_decode_distance ; /* if (!op) */
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143 and eax, edx ; /* eax &= hold */
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145 add r14d, eax ; /* len += hold & mask[op] */
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148 mov r8, r13 ; /* r8 = dmask */
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150 ja L_get_distance_code ; /* if (32 < bits) */
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152 lodsd ; /* eax = *(uint *)in++ */
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153 mov cl, bl ; /* cl = bits, needs it for shifting */
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154 add bl, 32 ; /* bits += 32 */
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156 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
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158 L_get_distance_code:
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159 and r8, rdx ; /* r8 &= hold */
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160 mov eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
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163 mov r15d, eax ; /* dist = this */
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164 shr r15d, 16 ; /* dist = this.val */
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166 sub bl, ah ; /* bits -= this.bits */
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167 shr rdx, cl ; /* hold >>= this.bits */
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168 mov cl, al ; /* cl = this.op */
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170 test al, 16 ; /* if ((op & 16) == 0) */
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171 jz L_test_for_second_level_dist
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172 and cl, 15 ; /* op &= 15 */
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173 jz L_check_dist_one
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175 L_add_bits_to_dist:
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180 dec eax ; /* (1 << op) - 1 */
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181 and eax, edx ; /* eax &= hold */
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183 add r15d, eax ; /* dist += hold & ((1 << op) - 1) */
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186 mov r8, rsi ; /* save in so from can use it's reg */
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188 sub rax, [rsp+40] ; /* nbytes = out - beg */
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191 jb L_clip_window ; /* if (dist > nbytes) 4.2% */
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193 mov ecx, r14d ; /* ecx = len */
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195 sub rsi, r15 ; /* from = out - dist */
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198 jnc L_copy_two ; /* if len % 2 == 0 */
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205 mov rsi, r8 ; /* move in back to %rsi, toss from */
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210 mov rsi, r8 ; /* move in back to %rsi, toss from */
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215 cmp r15d, 1 ; /* if dist 1, is a memset */
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217 cmp [rsp+40], rdi ; /* if out == beg, outside window */
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220 mov ecx, r14d ; /* ecx = len */
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234 L_test_for_second_level_length:
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236 jnz L_test_for_end_of_block ; /* if ((op & 64) != 0) */
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242 and eax, edx ; /* eax &= hold */
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243 add eax, r14d ; /* eax += len */
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244 mov eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
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248 L_test_for_second_level_dist:
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250 jnz L_invalid_distance_code ; /* if ((op & 64) != 0) */
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256 and eax, edx ; /* eax &= hold */
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257 add eax, r15d ; /* eax += dist */
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258 mov eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
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263 mov ecx, eax ; /* ecx = nbytes */
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264 mov eax, [rsp+92] ; /* eax = wsize, prepare for dist cmp */
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265 neg ecx ; /* nbytes = -nbytes */
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268 jb L_invalid_distance_too_far ; /* if (dist > wsize) */
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270 add ecx, r15d ; /* nbytes = dist - nbytes */
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271 cmp dword ptr [rsp+96], 0
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272 jne L_wrap_around_window ; /* if (write != 0) */
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274 mov rsi, [rsp+56] ; /* from = window */
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275 sub eax, ecx ; /* eax -= nbytes */
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276 add rsi, rax ; /* from += wsize - nbytes */
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278 mov eax, r14d ; /* eax = len */
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280 jbe L_do_copy ; /* if (nbytes >= len) */
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282 sub eax, ecx ; /* eax -= nbytes */
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285 sub rsi, r15 ; /* from = &out[ -dist ] */
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289 L_wrap_around_window:
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290 mov eax, [rsp+96] ; /* eax = write */
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292 jbe L_contiguous_in_window ; /* if (write >= nbytes) */
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294 mov esi, [rsp+92] ; /* from = wsize */
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295 add rsi, [rsp+56] ; /* from += window */
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296 add rsi, rax ; /* from += write */
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297 sub rsi, rcx ; /* from -= nbytes */
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298 sub ecx, eax ; /* nbytes -= write */
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300 mov eax, r14d ; /* eax = len */
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302 jbe L_do_copy ; /* if (nbytes >= len) */
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304 sub eax, ecx ; /* len -= nbytes */
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306 mov rsi, [rsp+56] ; /* from = window */
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307 mov ecx, [rsp+96] ; /* nbytes = write */
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309 jbe L_do_copy ; /* if (nbytes >= len) */
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311 sub eax, ecx ; /* len -= nbytes */
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314 sub rsi, r15 ; /* from = out - dist */
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318 L_contiguous_in_window:
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319 mov rsi, [rsp+56] ; /* rsi = window */
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321 sub rsi, rcx ; /* from += write - nbytes */
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323 mov eax, r14d ; /* eax = len */
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325 jbe L_do_copy ; /* if (nbytes >= len) */
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327 sub eax, ecx ; /* len -= nbytes */
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330 sub rsi, r15 ; /* from = out - dist */
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331 jmp L_do_copy ; /* if (nbytes >= len) */
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335 mov ecx, eax ; /* ecx = len */
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338 mov rsi, r8 ; /* move in back to %esi, toss from */
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341 L_test_for_end_of_block:
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343 jz L_invalid_literal_length_code
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344 mov dword ptr [rsp+116], 1
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345 jmp L_break_loop_with_status
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347 L_invalid_literal_length_code:
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348 mov dword ptr [rsp+116], 2
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349 jmp L_break_loop_with_status
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351 L_invalid_distance_code:
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352 mov dword ptr [rsp+116], 3
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353 jmp L_break_loop_with_status
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355 L_invalid_distance_too_far:
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356 mov dword ptr [rsp+116], 4
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357 jmp L_break_loop_with_status
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360 mov dword ptr [rsp+116], 0
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362 L_break_loop_with_status:
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363 ; /* put in, out, bits, and hold back into ar and pop esp */
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364 mov [rsp+16], rsi ; /* in */
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365 mov [rsp+32], rdi ; /* out */
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366 mov [rsp+88], ebx ; /* bits */
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367 mov [rsp+80], rdx ; /* hold */
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369 mov rax, [rsp] ; /* restore rbp and rsp */
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386 ; : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
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387 ; "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
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