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- x86 32 bit opcodes that differ in x86-x64 or entirely removed
- Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
- What’s the purpose of the LEA instruction?
- How exactly do partial registers on Haswell/Skylake perform? Writing AL seems to have a false dependency on RAX, and AH is inconsistent
- Why isn’t movl from memory to memory allowed?
- rbp not allowed as SIB base?
- What is the stack engine in the Sandybridge microarchitecture?
- What is the “FS”/”GS” register intended for?
- What is a Partial Flag Stall?
- Slow jmp-instruction
- How do you use gcc to generate assembly code in Intel syntax?
- Why are signed and unsigned multiplication different instructions on x86(-64)?
- What do the E and R prefixes stand for in the names of Intel 32-bit and 64-bit registers?
- Why is the address of static variables relative to the Instruction Pointer?
- Why is (or isn’t?) SFENCE + LFENCE equivalent to MFENCE?
- Why is imul used for multiplying unsigned numbers?
- What are the names of the new X86_64 processors registers?
- x64 instruction encoding and the ModRM byte
- What’s the purpose of the rotate instructions (ROL, RCL on x86)?
- Why not store function parameters in XMM vector registers?
- Why flush the pipeline for Memory Order Violation caused by other logical processors?
- Why does Intel hide internal RISC core in their processors?
- Why isn’t the instruction pointer a normal register usable with MOV or ADD?
- How to multiply a register by 37 using only 2 consecutive leal instructions in x86?
- What does “rep; nop;” mean in x86 assembly? Is it the same as the “pause” instruction?
- When should I use size directives in x86?
- Why does this code execute more slowly after strength-reducing multiplications to loop-carried additions?
- Arithmetic identities and EFLAGS
- What is the compatible subset of Intel’s and AMD’s x86-64 implementations?
- Is processor can do memory and arithmetic operation at the same time?