Re: operacje na bitach

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#9596

From: Paweł
Date: Tue, 25 Oct 2005 15:16

33 lines
1384 bytes

Paweł wrote:

> lub:
> 
> int i = ...
> byte b = (byte)(i ^ 0xff);

implementacja powyzszego zajmuje 9 bajtow ichnego kodu:

public static byte foo(int x)
{
    return (byte)(x ^ 0xff);
/*
        IL_0000:  ldarg.0
        IL_0001:  ldc.i4 255
        IL_0006:  xor
        IL_0007:  conv.u1
        IL_0008:  ret
*/
}

ale w sumie mozna to zrobic szybciej i latwiej (tylko 4 bajty kodu).

public static byte bar(int x)
{
    return (byte)(~x);
/*
        IL_0000:  ldarg.0
        IL_0001:  not
        IL_0002:  conv.u1
        IL_0003:  ret
*/
}

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From: Paweł <root@[127.0.0.1]>
Newsgroups: alt.pl.comp.lang.csharp
Subject: Re: operacje na bitach
Date: Tue, 25 Oct 2005 17:16:39 +0200
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