X86 string copy instruction

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The string instructions operate on strings of bytes. Operations include storing strings in memory, loading strings from memory, comparing strings, and scanning The instruction movs is used to copy source string into the destination (yes, copy, not move). This instruction has two variants: movsb and movsw. Each string instruction may require a source operand, a destination operand or both. For 32-bit segments, string instructions use ESI and EDI registers to This procedure, strcpy_asm , copies a C-string from the source to the destination and returns a pointer to the end of the destination so that another string can String Instructions · MOV moves data from the source string to the destination string. · CMP compares data between the source and destination strings (in x86, A normal string copy would copy any number of bytes and would include the . It is often good to learn from what the compiler gives you from a C function. You Data Movement Instructions. mov — Move. The mov instruction copies the data item referred to by its first operand (i.e. register contents, memory contentsThe x86 instruction set refers to the set of instructions that x86-compatible MOV, Move, copies data from one location to another, (1) r/m = r;