X86 opcode lea. Comprehensive reference for x86 opcode and instruction s...
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X86 opcode lea. Comprehensive reference for x86 opcode and instruction set, including detailed definitions of parameters and attributes. Sep 7, 2022 · Bonus! If you search for information about the LEA instruction, one of the top hits is a Stack Overflow question titled, "What’s the purpose of the LEA instruction?" One of the answers attributes a quote to, "the Zen of Assembly by Abrash": LEA, the only instruction that performs memory addressing calculations but doesn’t actually address x86 assembly tutorials, x86 opcode reference, programming, pastebin with syntax highlighting Description LEA calculates the effective address (offset part) and stores it in the specified register. See Table 3-54. Address calculation is governed by address size attribute, the default address size is 64-bits. The x86 instruction set was designed to support high-level languages like Pascal and C, where arrays—especially arrays of ints or small structs—are common. Nov 2, 2009 · As others have pointed out, LEA (load effective address) is often used as a "trick" to do certain computations, but that's not its primary purpose. The source operand is a memory address (offset part) specified with one of the processors addressing modes; the destination operand is a general-purpose register. The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. Computes the effective address of the second operand (the source operand) and stores it in the first operand (destination operand). Basic Data Movement Instructions LEA—Load Effective Address In 64-bit mode, the instruction’s destination operand is governed by operand size attribute, the default operand size is 32 bits.
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