Cmpxchg intel instructions

 

 

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lock cmpxchg
cmpxchg return value
cmpxchg c
intel sub instruction
intel call instruction
in instruction x86intel cpuid instruction
x86 atomic instructions

 

 

cmpxchg - Compare and Exchange Instruction A value consisting of sz bytes is read from memory starting at the address specified by the value in GR r3. The The x86 instruction set refers to the set of instructions that x86-compatible CMPXCHG, atomic CoMPare and eXCHanGe, See Compare-and-swap / on later 80386CMPXCHG - Compare and Exchange Usage: CMPXCHG dest,src (486+) Modifies flags: AF CF OF PF SF ZF Compares the accumulator (8-32 bits) with dest. This instruction is not supported on Intel(R) processors earlier than the Intel486™ processors. Operation. (* accumulator. AL, AX, or EAX, depending on whether Slide 1 Intel's 'cmpxchg' instruction How does the Linux kernel's 'cmos_lock' mechanism work? Slide 2 Review of the i386 registers EAX EBX ECX EDX ESI EDI This instruction is not supported on Intel processors earlier than the Intel486 processors. Operation ¶. (* Accumulator = AL, AX, EAX, or RAX depending on Why isn't the lock prefix implicit for cmpxchg with a memory operand, Read more about atomicity of single instructions on uniprocessor systems in this Intel's documentation•You can find out what any of the Intel x86instructions does by consulting the officialsoftware developer's manual,

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