Performs a loop operation using the RCX, ECX or CX register as a counter (depending on whether address size is 64 bits, 32 bits, or 16 bits). Note that the LOOP instruction ignores …

Oct 23, 2017 · loop is exactly like dec ecx / jnz, except it doesn't set flags. It's like the bottom of a do {} while(--ecx != 0); in C. If execution enters the loop with ecx = 0, wrap-around means the …

Nov 9, 2015 · Recent x86 processor use macro-fusion to combine cmp/jmp instructions into a single cycle instruction, essentially replicating jcxz behavior on the fly. –

loop instructions provide iteration control and combine loop index management with conditional branching. Prior to using the loop instruction, load the count register with an unsigned iteration …

Sep 1, 2023 · loopz loop if zero; That way, only testing for a non-zero ECX can be combined with testing ZF. Other flags can not be tested for, say there is no loopnc “loop while ECX ≠ 0 and …

Nov 18, 2009 · LOOP decrements ecx and checks if ecx is not zero, if that condition is met it jumps at specified label, otherwise falls through. LOOPE decrements ecx and checks that ecx …

Nov 21, 2010 · The 80x86 provides several instructions designed to implement for -like loops. Each of these instructions takes a code label as its single operand. LOOP Decrements ECX, if …

Feb 26, 2025 · Reference guide for common x86 instruction opcodes with a description and example. Covers the most commonly used x86 opcodes. Modern x86 processors support …

Aug 16, 2020 · This video deals with the concepts of Conditional loops i.e. LOOPZ, LOOPE, LOOPNZ and LOOPNE in assembly language with some examples.. ...more. Study Point …

Jan 2, 2022 · A group of instructions can be repeated a number of times (i.e., until CX = 0 and ZF ≠ 0) by using LOOPE/LOOPZ. Example for LOOPNE/LOOPNZ :