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Intel ADX : ウィキペディア英語版
Intel ADX
Intel ADX (Multi-Precision Add-Carry Instruction Extensions) is Intel's arbitrary-precision arithmetic extension to the x86 instruction set architecture (ISA). Intel ADX was first supported in the Broadwell microarchitecture.〔(Intel Architecture Instruction Set Extensions Programming Reference ) (Document number 319433-013B) // Intel, July 2012, Chapter 9: Additional new instructions〕
The instruction set extension contains just two new instructions, though MULX from BMI2 is also considered as a part of the large integer arithmetic support.〔(【引用サイトリンク】title= New Instructions Supporting Large Integer Arithmetic on Intel Architecture Processors )
Both instructions are more efficient variants of the existing ADC instruction, with the difference that each of the two new instructions affects only one flag, where ADC as a signed addition may set both overflow and carry flags, and as an old-style x86 instruction also reset the rest of the CPU flags. Having two versions affecting different flags means that two chains of additions with carry can be calculated in parallel.〔
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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