Re: ADD SUB kontra INC DEC

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Article #2363

#2363

From: Andrzej Grażyński
Date: Mon, 20 Sep 2010 21:40

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yesma pisze:
> http://www.agner.org/instruction_tables.pdf
> 9 List of instruction timings and μop breakdown for P4E
> 
> Tyle że niema tutaj podane dla ADD, SUB operands r,i
> 
> Instruction       ADD, SUB         INC, DEC
> Operands          r,r              r
> µops              1                2
> Microcode         0                0
> Latency           1                1
> Throughput        0.25             0.5
> Port              0/1              0/1
> Unit              alu0/1           alu0/1
> 
> Czy nielepiej jest stosować zawsze ADD SUB zamiast INC DEC ?

INC/DEC nie ruszają flagi C.

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From: Andrzej Grażyński <grazynsk@petex.com.pl>
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Subject: Re: ADD SUB kontra INC DEC
Date: Mon, 20 Sep 2010 23:40:35 +0200
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