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NOP (code)

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In some cases, such as the body of a function, a block must be used, but this can be empty. In C, statements cannot be empty—simple statements must end with a ; (semicolon) while compound statements are enclosed in {} (braces), which does not itself need a following semicolon. Thus in contexts
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In the case of the NOP instruction, the second value in the second byte is the "base" register of a combined base register, displacement register and offset address. If the base register is also 0, the branch is not taken regardless of the value of the displacement register or displacement address.
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to bypass security checks and instead simply return the expected value being checked for. Because most of the instructions in the security check routine will be unused, these would be replaced with NOPs, thus removing the software's security functionality without altering the positioning of
1619:' command is a shell builtin that has similar effect to a "NOP" (a do-nothing operation). It is not technically an NOP, as it changes the special parameter $ ? (exit status of last command) to 0. It may be considered a synonym for the shell builtin 'true', and its exit status is true (0). 709:
In the case of the NOPR instruction, the second value in the second byte is the register to branch on. If register 0 is chosen, no branch occurs regardless of the mask value. Thus, if either of the two values in the second byte is 0, the branch will not happen.
256:, or as a place-holder to be replaced by active instructions later on in program development (or to replace removed instructions when reorganizing would be problematic or time-consuming). In some cases, a NOP can have minor side effects; for example, on the 1387:(note that the last form may be confusing, and as such generates a warning with some compilers or compiler options, as semicolon usually indicates an end of function call instruction when placed after a parenthesis on the end of line). 702:
The NOP ("No-Op") and NOPR ("No-Op Register") are a subset of the "Branch on Condition" or "Branch on Condition Register" instructions, respectively; both versions have two options for generating a NO-OP.
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In the case of both the NOP and NOPR instructions, the first 0 in the second byte is the "mask" value, the condition to test such as equal, not equal, high, low, etc. If the mask is 0, no branch occurs.
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to execute. In other instruction sets, there is no explicit NOP instruction, but the assembly language mnemonic NOP represents an instruction which acts as a NOP; e.g., on the
1569:. In fact, due to the specification of the language, in a BEGIN / END block, the semicolon is optional before the END statement, thus a semicolon used there is superfluous. 1262:
statement must be used to specify that no action is required. (Thus, if the programmer forgets to write a sequence of statements, the program will fail to compile.)
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Note that unlike the other protocols listed, the IMAP4 NOOP command has a specific purpose—it allows the server to send any pending notifications to the client.
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The * bytes are arbitrary, and can be anything from 0 to the maximum byte (required to be in the range 63-99). MIX uses sign-magnitude representation.
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0x66 is the operand-size override prefix. 0x0F 0x1F is a two-byte NOP opcode that takes a ModRM operand upon which no operation is performed; 0x00 is
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until it returns a \n (newline) character, essentially fast-forwarding the current reading location of standard input to the beginning of next line.
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statement is used in some contexts such as the last statement in a DO loop, although it can be used anywhere, and does not have any functionality.
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A function or a sequence of programming language statements is a NOP or null statement if it has no effect. Null statements may be required by the
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command. It does nothing by itself, but may be used to prevent the immediately preceding command from parsing any subsequent tokens.
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servers respond to a NOOP command with "OK" or "+OK", some programmers have added quirky responses to the client. For example, the
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The null statement is useless by itself, but it can have a syntactic use in a wider context, e.g., within the context of a loop:
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which has no effect when executed and thus serves as a NOP. It is primarily used to ensure correct syntax due to Python's
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An empty block (compound statement) is also a NOP, and may be more legible, but will still be ignored by the compiler.:
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software that checks for serial numbers, specific hardware or software requirements, presence or absence of hardware
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Palindromic NOP - that is, an instruction that executes as NOP regardless of whether byte order is interpreted as
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From a hardware design point of view, unmapped areas of a bus are often designed to return zeroes; since the
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include an instruction whose explicit purpose is to not change the state of any of the programmer-accessible
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versions of the 65xx family were converted to be NOPs of varying instruction lengths and cycle times in the
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may be used as a placeholder to indicate no action, even if placed inside another BEGIN / END block.
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statement serves as a NOP. As the syntax forbids that control statements or functions be empty, the
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SWYM stands for "Sympathize with your machinery". The * digits can be chosen arbitrarily.
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This article is about the "No Operation" computer instruction. For Null statement, see
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behavior is often desirable, it gives a bias to coding it with the all-zeroes opcode.
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or that the server is responsive. A NOOP command is part of the following protocols (
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Note that NOP is a special case of the SETHI instruction, with imm22 = 0 and rd = 0.
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language does not have a built-in NOP statement. Many implementations are possible:
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where a statement is grammatically required, some such null statement can be used.
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requires an indented block with the class logic, which has to be expressed as
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prefix, making the encoding 0x48 0x90. However, 0x90 is interpreted as a
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As with C, the ; used by itself can be used as a null statement in
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Define a custom NOP function, as in the following example (using the
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0x47000000 or 0x470nnnnn or 0x47n0nnnn where "n" is any 4-bit value.
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series of processors, the NOP opcode causes a synchronization of the
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Use a NOP function available in a third-party library —see below;
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Listed below are the NOP instruction for some CPU architectures:
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According to The TeXbook, 'TeX does nothing' when it encounters
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Advanced Bash-Scripting Guide > Chapter 3. Special Characters
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Alternatives, in situations where a function is required, are:
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Machine instruction that indicates to a computer to do nothing
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statements, which has historical and performance reasons.
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The RISC-V Instruction Set Manual, Volume 1: User-Level ISA
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in long mode regardless of whether it is preceded by 0x48.
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may tell TeX, 'This is the end of what you've been doing'.
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built-in function, that accepts any arguments and returns
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which is encoded 0xE1A00000 (little-endian architecture).
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A NOP is most commonly used for timing purposes, to force
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Bausum, David (2002). "TeX Primitive Control Sequences".
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0x0700 or 0x070n or 0x07n0 where "n" is any 4-bit value.
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and later Intel processors, and all AMD AMD64 processors
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X86 instruction listings#Added in P5/P6-class processors
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zsh manpage (zshbuiltins) > SHELL BUILTIN COMMANDS
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A NOP must not access memory, as that could cause a
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RealView Compilation Tools for BREW Assembler Guide
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RealView Compilation Tools for BREW Assembler Guide
2062:ECMAScript Language Specification – Edition 5.1 – 1277:Be aware that your C-compiler is going to ignore 2206: 193: 1858:"Motorola 68000 Programmer's Reference Manual" 1811:– the functional programming equivalent to NOP 1631:typographical system's macro language has the 1390:The above code continues calling the function 332:requires two bytes, as it would begin with an 1599:; for example the syntax for definition of a 385:0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 135: 2034:Ada Reference Manual — null statements 1948: 1946: 1557:, which returns undefined and does nothing. 2064:Properties of the Function Prototype Object 1754:. This process is accomplished by altering 2181: 214:. It often takes a well-defined number of 142: 128: 1983:Weaver, D. L.; Germond, T., eds. (1994). 1943: 1823:– a command sometimes used instead of NOP 1623:TeX macro language (ConTeXt, LaTeX, etc.) 2121:bash manpage > SHELL BUILTIN COMMANDS 1986:The SPARC Architecture Manual, Version 9 1852: 1850: 1759:everything which follows in the binary. 1638: 2049:. "The empty statement is a semicolon ( 1456:expression as a complete statement (an 1270:The simplest NOP statement in C is the 1242:of some languages in certain contexts. 531:, an instruction that asserts that the 401:, and 0x84 0x00 0x00 0x00 0x00 0x00 is 381:0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 2207: 2139: 1525:function that performs no operations. 1442: 1933:"5.6.3. NOP Thumb pseudo-instruction" 1847: 1767:The NOP opcode can be used to form a 1200:Delay is dependent on processor type 1902:Am29050 Microprocessor User's Manual 1762: 1653:ensure the connection is still alive 1265: 1158:Jump never, set nothing, skip never 1915:"4.8.4. NOP ARM pseudo-instruction" 1728:responds to NOOP with the message: 1126:which zeroes the hardwired-to-zero 13: 1179:Clear none of the condition codes 885:and prevents instruction overlap. 377:0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 320:0x90 is the one-byte encoding for 23:. For Do nothing instruction, see 14: 2236: 1611:Shell scripting (bash, zsh, etc.) 1973:, version 2.2, 7 May 2017, p.79. 1146:JUMP, SETA, SETAI, CAI, TRN, TLN 2169: 2133: 2124: 2115: 2104: 2080: 2068: 2056: 2039: 1101:Move AUX to AUX with no rotate 170:(pronounced "no op"; short for 2027: 1976: 1963: 1956:, 1995, pages 2-21 and 7-103. 1925: 1907: 1894: 1781:Comment (computer programming) 398:, 0x80 0x00 0x00 0x00 0x00 is 328:in 32-bit code. In long mode, 1: 2077:from jQuery API documentation 1840: 1742:NOPs are often involved when 1413: 373:0x66 0x0F 0x1F 0x44 0x00 0x00 194:Machine language instructions 2146:. Kluwer Academic Publishers 1597:indentation-sensitive syntax 1572:Also, a block consisting of 1553:library provides a function 1537:library provides a function 1512: 7: 2045:MDN JavaScript reference – 1774: 1737: 1588:programming language has a 991:little-endian or big-endian 936:consumes two clock cycles. 598:will most likely expand to 564:will most likely expand to 560:. The assembly instruction 269: 190:command that does nothing. 25:Do Nothing (disambiguation) 10: 2241: 1904:, 1991, pages 223 and 257. 1397: 18: 1756:functions and subroutines 1607:when it should be empty. 1579: 1560: 1544: 1528: 1042: 952: 701: 669: 602:which is encoded 0x46C0. 296: 1954:PA-RISC 2.0 Architecture 1750:, etc. in the form of a 1489: 1361: 1330: 1299: 369:0x0F 0x1F 0x44 0x00 0x00 1486:arrow function syntax): 1441:the same way as in the 1233: 2088:"Lodash Documentation" 1657:this is a partial list 1541:, which does nothing. 1245: 881:This synchronizes the 27:. For other uses, see 1817:– mainframe tautology 1803:HLT (x86 instruction) 1799:– also pauses the CPU 1787:Computer architecture 1639:NOP protocol commands 1153:25500******* (octal) 1014:(extended opcode for 866:Motorola 68000 family 794:(extended opcode for 687:UNIVAC Series 90 29:NOOP (disambiguation) 2143:TeX Reference Manual 1833:, the official long 1470:Function.prototype() 1458:expression statement 535:is equal to itself. 395:, 0x44 0x00 0x00 is 184:programming language 178:instruction and its 33:NOP (disambiguation) 1969:RISC-V Foundation, 1797:Halt and Catch Fire 1521:framework provides 1024:PIC microcontroller 911:MOS Technology 65xx 679:IBM System/390 675:IBM System/370 671:IBM System/360 365:0x0F 0x1F 0x40 0x00 324:in 16-bit code and 254:execute instruction 116:Execute instruction 2220:Computing acronyms 1645:computer protocols 111:Repeat instruction 1952:Hewlett-Packard, 1821:xyzzy (computing) 1809:Identity function 1763:Security exploits 1734:NOOP to you too! 1443:C and derivatives 1359:or more tersely: 1266:C and derivatives 1224: 1223: 938:Undefined opcodes 529:aseq 0x40,gr1,gr1 273:CPU architecture 250:branch delay slot 188:computer protocol 180:assembly language 152: 151: 2232: 2225:X86 instructions 2199: 2198: 2196: 2195: 2185: 2179: 2173: 2167: 2166: 2163: 2159: 2153: 2151: 2137: 2131: 2128: 2122: 2119: 2113: 2108: 2102: 2101: 2099: 2098: 2084: 2078: 2072: 2066: 2060: 2054: 2052: 2043: 2037: 2031: 2025: 2024: 2019: 2018: 2012: 2006:. 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640: 637: 632: 625: 624: 622: 619: 616: 611: 604: 603: 588: 585: 582: 577: 570: 569: 554: 551: 548: 543: 537: 536: 533:stack register 525: 522: 519: 514: 508: 507: 500: 497: 494: 489: 483: 482: 480: 477: 474: 469: 455: 454: 452: 449: 446: 441: 427: 426: 425:Load A from A 423: 420: 417: 412: 406: 405: 387: 361:0x0F 0x1F 0x00 356: 349: 342: 341: 318: 315: 312: 307: 294: 293: 290: 285: 280: 274: 258:Motorola 68000 248:, to occupy a 198:Some computer 195: 192: 186:statement, or 150: 149: 147: 146: 139: 132: 124: 121: 120: 119: 118: 113: 108: 107: 106: 96: 88: 87: 83: 82: 81: 80: 75: 74: 73: 68: 66:Illegal opcode 58: 50: 49: 45: 44: 15: 9: 6: 4: 3: 2: 2237: 2226: 2223: 2221: 2218: 2216: 2213: 2212: 2210: 2190: 2184: 2178: 2172: 2165: 2145: 2144: 2136: 2127: 2118: 2112: 2107: 2093: 2089: 2083: 2076: 2075:jQuery.noop() 2071: 2065: 2059: 2048: 2042: 2035: 2030: 2023: 2013:on 2012-01-18 2009: 2005: 2003:0-13-825001-4 1999: 1995: 1994:Prentice Hall 1988: 1987: 1979: 1972: 1966: 1959: 1955: 1949: 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453: 450: 447: 442: 439: 435: 432: 429: 428: 424: 421: 418: 413: 411: 408: 407: 388: 386: 383: 379: 375: 371: 367: 363: 357: 354: 350: 344: 343: 319: 316: 313: 308: 305: 302: 299: 295: 291: 289: 286: 284: 281: 279: 275: 272: 271: 268: 265: 263: 259: 255: 251: 247: 244:, to prevent 243: 238: 236: 232: 227: 221: 217: 213: 209: 205: 201: 191: 189: 185: 181: 177: 173: 169: 165: 161: 157: 145: 140: 138: 133: 131: 126: 125: 123: 122: 117: 114: 112: 109: 105: 102: 101: 100: 97: 95: 92: 91: 90: 89: 85: 84: 79: 76: 72: 69: 67: 64: 63: 62: 59: 57: 54: 53: 52: 51: 47: 46: 43: 40: 39: 34: 30: 26: 22: 21:Null function 2215:Machine code 2192:. Retrieved 2183: 2171: 2160:. Actually, 2155: 2148:. Retrieved 2142: 2135: 2126: 2117: 2106: 2095:. Retrieved 2091: 2082: 2070: 2058: 2041: 2029: 2021: 2015:. Retrieved 2008:the original 1985: 1978: 1965: 1936: 1927: 1918: 1909: 1896: 1885:. Retrieved 1766: 1741: 1711: 1708: 1656: 1642: 1626: 1614: 1583: 1571: 1564: 1548: 1532: 1523:angular.noop 1516: 1463: 1457: 1438: 1430: 1417: 1401: 1391: 1389: 1386: 1379:'\n' 1358: 1348:'\n' 1327: 1317:'\n' 1296: 1292: 1286: 1278: 1276: 1271: 1269: 1249: 1237: 1225: 1124:sethi 0, %g0 1091:MOV AUX, AUX 1078:C.ADDI x0, 0 932: 816:± * * * * 0 796:add r0,r0,r0 712: 708: 704: 621:0xF3AF 8000 384: 380: 376: 372: 368: 364: 360: 330:XCHG RAX,RAX 326:XCHG EAX,EAX 276:Instruction 266: 239: 231:memory fault 228: 224:sethi 0, %g0 216:clock cycles 208:status flags 197: 172:no operation 171: 167: 163: 159: 153: 93: 86:Instructions 71:Opcode table 42:Machine code 1792:Filler text 1712:While most 1122:Stands for 1119:0x01000000 1056:0x00000013 1016:ori r0,r0,0 1011:0x60000000 986:0x34000034 969:Opcode for 966:0x08000240 837:0xFD****** 791:0x60000019 771:sll r0,r0,0 769:Stands for 766:0x00000000 642:0xD503201F 590:Opcode for 553:0x00000000 527:Opcode for 524:0x70400101 502:Opcode for 499:0x47FF041F 353:Pentium Pro 345:multi-byte 2209:Categories 2194:2016-06-19 2097:2017-12-15 2092:lodash.com 2017:2014-01-09 1887:2012-03-01 1841:References 1724:daemon of 1704:BitTorrent 1647:, such as 1574:BEGIN END; 1420:JavaScript 1414:JavaScript 1156:Jump never 600:mov r8, r8 592:ADD SP, #0 566:mov r0, r0 463:Intel 8085 459:Intel 8080 410:Intel 8008 322:XCHG AX,AX 235:page fault 182:mnemonic, 1769:NOP slide 1752:NOP slide 1593:statement 1519:AngularJS 1513:AngularJS 1474:undefined 1450:undefined 1445:examples; 1392:getchar() 1228:NOP slide 1130:register 631:(64 bit) 610:(32 bit) 576:(16 bit) 487:DEC Alpha 358:0x66 0x90 204:registers 2189:"ftpd.c" 1958:Archived 1775:See also 1744:cracking 1738:Cracking 1555:_.noop() 1468:Use the 1448:Use the 1426:Use the 1408:CONTINUE 1284: ; 1095:16 bits 1033:12 bits 979:LDI 26,0 971:OR 0,0,0 883:pipeline 351:2–9 for 278:mnemonic 262:pipeline 2150:1 April 1815:IEFBR14 1748:dongles 1452:or the 1433:or the 1404:Fortran 1398:Fortran 1370:getchar 1339:getchar 1308:getchar 1218:0x0000 1150:1 word 1141:JFCL 0, 1098:0x0000 1074:0x0001 999:PowerPC 954:PA-RISC 940:in the 878:0x4E71 813:1 word 746:0x0009 662:0x0000 629:ARM A64 608:ARM T32 587:0xb000 574:ARM T32 541:ARM A32 512:AMD 29k 440:family 306:family 246:hazards 174:) is a 78:Operand 2162:\relax 2158:\relax 2000:  1714:telnet 1694:finger 1664:telnet 1649:telnet 1633:\relax 1586:Python 1580:Python 1567:Pascal 1561:Pascal 1551:Lodash 1545:Lodash 1535:jQuery 1529:jQuery 1437:empty 1406:, the 1254:, the 1240:syntax 1164:PDP-11 1136:PDP-10 1044:RISC-V 913:(e.g. 779:MIPS-X 734:SuperH 438:MCS-51 292:Notes 288:Opcode 212:memory 99:Branch 61:Opcode 2177:relax 2011:(PDF) 1990:(PDF) 1900:AMD, 1861:(PDF) 1726:MINIX 1699:IMAP4 1643:Many 1615:The ' 1601:class 1504:=> 1492:const 1364:while 1333:while 1302:while 1197:0x01 1107:SPARC 1067:C.NOP 946:65C02 928:0xEA 903:0x12 858:0x01 479:0x00 451:0x00 431:Intel 422:0xC0 334:REX.W 317:0x90 298:Intel 283:Bytes 220:SPARC 210:, or 166:, or 164:no-op 2152:2020 1998:ISBN 1831:NOPL 1722:ftpd 1689:NNTP 1684:POP3 1674:SMTP 1627:The 1605:pass 1591:pass 1584:The 1549:The 1533:The 1517:The 1495:noop 1454:null 1418:The 1279:null 1260:null 1256:null 1234:Code 1206:WD16 942:NMOS 915:6502 830:SWYM 825:MMIX 754:MIPS 721:NOPR 434:8051 168:NOOP 158:, a 31:and 1835:NOP 1732:200 1718:FTP 1716:or 1679:X11 1669:FTP 1659:): 1629:TeX 1507:{}; 1484:ES6 1402:In 1290:{} 1252:Ada 1250:In 1246:Ada 1211:NOP 1190:NOP 1185:VAX 1169:NOP 1128:%g0 1112:NOP 1049:NOP 1029:NOP 1004:NOP 959:NOP 933:NOP 921:NOP 896:NOP 871:NOP 851:NOP 809:NOP 804:MIX 784:NOP 759:NOP 739:NOP 692:NOP 655:NOP 650:AVR 635:NOP 614:NOP 596:nop 580:NOP 562:nop 546:NOP 517:NOP 492:NOP 472:NOP 467:Z80 444:NOP 415:LAA 347:NOP 338:NOP 310:NOP 304:CPU 301:x86 237:. 233:or 160:NOP 154:In 94:NOP 2211:: 2154:. 2090:. 2020:. 1996:. 1992:. 1945:^ 1935:. 1917:. 1869:^ 1849:^ 1829:- 1501:() 1435:{} 1382:); 1376:!= 1373:() 1345:!= 1342:() 1323:{} 1314:!= 1311:() 1215:2 1194:1 1173:2 1116:4 1071:2 1053:4 1018:) 1008:4 983:4 973:. 963:4 948:. 925:1 917:) 900:1 875:2 855:1 834:4 798:) 788:4 763:4 743:2 725:2 696:4 685:, 681:, 677:, 673:, 659:2 639:4 618:4 584:2 550:4 521:4 496:4 476:1 465:, 461:, 448:1 436:/ 419:1 404:. 314:1 264:. 226:. 222:, 206:, 162:, 2197:. 2100:. 2051:; 1939:. 1921:. 1890:. 1863:. 1617:: 1498:= 1476:; 1428:; 1367:( 1354:; 1351:) 1336:( 1320:) 1305:( 143:e 136:t 129:v 35:.

Index

Null function
Do Nothing (disambiguation)
NOOP (disambiguation)
NOP (disambiguation)
Machine code
Instruction set
Opcode
Illegal opcode
Opcode table
Operand
NOP
Branch
Indirect branch
Repeat instruction
Execute instruction
v
t
e
computer science
machine language
assembly language
programming language
computer protocol
instruction sets
registers
status flags
memory
clock cycles
SPARC
memory fault

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