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http://www.geoffchappell.com/studies/windows/km/cpu/cx8.htm
CMPXCHG8B Support in the Windows Kernel . The 32-bit Windows kernel started using the 8-byte compare-exchange instruction (cmpxchg8b) in version 4.0.At first, the instruction had only a few uses, for more efficient coding of the following exported functions:
https://www.intel.com/content/dam/support/us/en/documents/processors/invalid_instruction_cmpxchg8b_erratum1.pdf
The CMPXCHG8B instruction compares a 64-bit value from internal registers of the processor with a 64-bit value from memory (the destination). It is illegal to use a register as the destination. The result of the CMPXCHG8B instruction is a 64-bit value that will not fit into a 32-bit register.
https://www.intel.com/content/www/us/en/support/articles/000008595/processors.html
Invalid Instruction CMPXCHG8B Erratum This document provides a technical overview of the issue and describes the problem, implications, and workaround.
https://www.felixcloutier.com/x86/cmpxchg8b:cmpxchg16b
This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically. To simplify the interface to the processor’s bus, the destination operand receives a write cycle without regard to the result of the comparison.
https://www.boost.org/doc/libs/1_72_0/doc/html/atomic/interface.html
Macro Description BOOST_ATOMIC_NO_CMPXCHG8B. Affects 32-bit x86 Oracle Studio builds. When defined, the library assumes the target CPU does not support cmpxchg8b instruction used to support 64-bit atomic operations. This is the case with very old CPUs (pre-Pentium).
https://www.phatcode.net/res/223/files/html/Chapter_6/CH06-2.html
CHAPTER SIX: THE 80x86 INSTRUCTION SET (Part 2) 6.5 - Arithmetic Instructions ... (decimal adjust for addition) instructions support BCD arithmetic. Beyond this chapter, this text will not cover BCD or ASCII arithmetic since it is mainly for controller applications, not general purpose programming applications. ... and CMPXCHG8B Instructions.
https://software.intel.com/en-us/forums/intel-moderncode-for-parallel-architectures/topic/311067
Your threading tips are sound. The thread aware memory pools are nice. =)Here are some of my advanced threading tips: =)You should spice up your threading site by adding a:" Rock-Solid Lock-Free Algo's /w cmpxchg8b & cmp8xchg16b Tutorials " additon to your site.You Intel guys really need to promote the cmpxchg8b and the cmp8xchg16b ( for Merced I think ) opcodes.
http://heather.cs.ucdavis.edu/~matloff/50/PLN/lock.pdf
Intel’s ‘cmpxchg’ instruction. Intel’s documentation •You can find out what any of the Intel x86 instructions does by consulting the official software developer’s manual, online at: ... So we need to consider this instruction within it’s surrounding context
https://forums.freebsd.org/threads/cpu-doesnt-support-long-mode.12045/
Jul 12, 2011 · "CPU doesn't support long mode"? Thread starter omgbsd; Start date ... IA MMX Supported IA SSE Supported IA SSE 2 Not Supported IA SSE 3 Not Supported CLFLUSH Instruction Not Supported CMPXCHG8B Instruction Supported CMPXCHG16B Instruction Not Supported Conditional Move Instruction Supported MONITOR / MWAIT Instruction Not Supported RDTSCP ...
http://eun.github.io/Intel-Pentium-Instruction-Set-Reference/data/cpuid.html
The CPUID instruction can be executed at any privilege level to serialize instruction execution. Serializing instruction execution guarantees that any modifications to flags, registers, and memory for previous instructions are completed before the next instruction is fetched and executed (see "Serializing Instructions" in Chapter 7 of the Intel Architecture Software Developer's Manual, Volume 3).
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