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9 Jan 2014 In pipelined processors, instruction are fetched, decoded, and executed speculatively, and are not permitted to modify system state until
25 Mar 2002 Okay, maybe AMD wanted to keep their ISA as close to x86 as possible, but the two biggest complaints against the x86 instruction set are (a)
In computer engineering, a load/store architecture divides instructions into 2 categories: This differs from a register memory architecture (used by CISC designs such as x86) in which one of the operands for the ADD operation may be in
LEA: load effective address of operand into SAHF: Stores AH register to low byte of flag
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors .. 0F AE F0, Memory Fence, Performs a serializing operation on all load and store instructions that were issued prior the MFENCE instruction.
Is that only load/store operations are not reordered around memory fences? My understanding is that serializing instructions such as CPUID
0F A3, BT r/m16, r16, Store selected bit in CF flag Instead, software should use the MOV instructions to load from or store to these addresses, and use the
x86 Instruction Set Reference. Derived from the . LAHF, Load Status Flags into AH Register MASKMOVDQU, Store Selected Bytes of Double Quadword.
Opcode, Mnemonic, Description. 88 /r, MOV r/m8,r8, Move r8 to r/m8. 89 /r, MOV r/m16,r16, Move r16 to r/m16. 89 /r, MOV r/m32,r32, Move r32 to r/m32.
For a complete list, see Intel's instruction set reference. We use mov byte ptr [var], 5 — store the value 5 into the byte at location var.
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