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test eax eax js
cmpl x86
x86 test
x86 jmp opcode
jb assembly
assembly jump commands
assembly je
x86 cmp
18 Jun 2015 I didn't even have Turbo Assembler, yet. I was writing in assembly language and “compiling" to an executable with the DOS `debug` command line tool. If that sounds crazy, believe me, it was. I'm betting even those of you who used DOS probably didn't realize you could use debug to assemble instructions,
Looking more closely I found that many of the instructions were synonyms for each other, and in practice the whole gamut is not needed, and in the process found that my copy of Intel's 80386 So I have grouped these functionally, with all instruction synonyms in the same row. JS, Jump if sign, SF = 1, 78, 0F 88.
20 Oct 2017 The main difference between OdinMonkey (asm.js) and IonMonkey (“regular" JavaScript) is that IonMonkey has to cohabit with the Baseline compiler and the Interpreter. Thus it has to avoid object allocations while executing SIMD instructions and while boxing the SIMD values when calling back or
11 Nov 2015 Description. The js (or jne) instruction is a conditional jump that follows a test. It jumps to the specified location if the previous instruction sets the Sign Flag (SF).
In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND is discarded. The OF and CF flags are set to 0 , while AF flag is undefined. There are 9 different opcodes for the TEST instruction depending on the type and size of the
16 May 2014 asm.js is a strict subset of JavaScript. It is not a new language. asm.js is a restricted set of definitions that provide good performance characteristics. These definitions can be combined, like assembly language instructions, to create very fast JavaScript applications. asm.js takes advantage of some low level
asm.js. an extraordinarily optimizable, low-level subset of JavaScript. specification (work in progress) frequently asked questions · big web app? compile it! — slide deck by @kripken.
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19 Feb 2014 JS will jump if the sign flag is set (by an earlier instruction). CMP will always modify the flags by performing a subtraction, in this case %al - %cl . (assuming Intel syntax, not AT&T). Because of the length of the instructions, the sign will be the bit 7 of the expression %al-%cl (and which is thrown away).
Almost all programming languages have the ability to change the order in which statements are evaluated, and assembly is no exception. The instruction pointer (EIP) register contains the address of the next instruction to be executed. To change the flow of control, the programmer must be able to modify the value of EIP.
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