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paizaでインラインアセンブラ その3

Posted at

#概要

x64で、インラインアセンブラやってみた。
九九やってみた。

#結果

    1  2  3  4  5  6  7  8  9 
 1  1  2  3  4  5  6  7  8  9 
 2  2  4  6  8 10 12 14 16 18 
 3  3  6  9 12 15 18 21 24 27 
 4  4  8 12 16 20 24 28 32 36 
 5  5 10 15 20 25 30 35 40 45 
 6  6 12 18 24 30 36 42 48 54 
 7  7 14 21 28 35 42 49 56 63 
 8  8 16 24 32 40 48 56 64 72 
 9  9 18 27 36 45 54 63 72 81 

#サンプルコード

#include <stdio.h>
int kakeru( int a, int b)
{
    __asm__ volatile ("imul %2, %0;" 
        : "=r" (a) 
        : "0" (a), "r" (b) 
        : );  
    return a;
}
int main(void)
{
    int i, 
        j;
    printf ("   ");
    for (i = 1; i < 10; i++) 
    {
        printf ("%2d ", i);
    }
    printf ("\n");
    for (j = 1; j < 10; j++) 
    {
        printf ("%2d ", j);
        for (i = 1; i < 10; i++) 
        {
            printf ("%2d ", kakeru(i, j));
        }
        printf ("\n");
    }
}


#成果物

以上。

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