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x86 sub
x86 test
x86 cmp flags
assembly cmp example
x86 cmpl
jump instruction in assembly language
je x86
x86 jmp
DEC; CMP instruction; Unconditional Jumps; Conditional Jumps; Conditional Jumps, Cont; Conditional Jumps, Cont; LOOP Instruction; Logical Instructions; Logical Instructions, Cont. Shift Instructions; SHL and SHR Shift Instructions; Shift Instructions Examples; Rotate Instructions; ROL and ROR, Rotate Without Carry; RCL
1 Jan 2017 The full x86 instruction set is large and complex (Intel's x86 instruction set manuals comprise over 2900 pages), and we do not cover it all in this guide. For example .. For example, conditional branches such as jle and jne are based on first performing a cmp operation on the desired operands. Syntax
10 Aug 2016 Directives begin with a dot and indicate structural information useful to the assembler, linker, or debugger. but are not in and of themselves assembly instructions. For example, .file simply records the name of the original source file. .data indicates the start of the data section of the program, while .text
Example. cmp [ebp+arg_0], 1 ; compare 1 with [ebp+arg_0] jnz short loc_402B1D ; Jump short if not zero (ZF=0)
(Pentium & later only). The IP register points to the memory offset of the next instruction in the code segment (it points to the first byte of the instruction). The IP register cannot be accessed by the programmer directly. The x86 registers can be used by using the MOV instructions. For example, in Intel syntax: mov ax, 1234h
18 Apr 2014 I shared with you this example because while writing C code, and reading Michael Abrash's Graphics Programming Black Book, I wondered to myself if hardcore C programmers also would know the equivalent assembly instructions that would be emitted from their higher level C code (before optimizing
If arg2 is an immediate value it will be sign extended to the length of arg1 . The EFLAGS register is set in the same manner as a sub instruction. Note that the GAS/AT&T syntax can be rather confusing, as for example cmp $0, %rax followed by jl branch will branch if %rax < 0 (and not
The simplest way to set the condition flags is to use a comparison operation, such as cmp . This mechanism is common to many processor architectures, and the semantics (if not the details) of cmp will likely be familiar. In addition, we have already seen that many instructions (such as sub in the example) can be modified to
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