none/tests/ppc32/lsw.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5
   6 /* Apparently the "b" register constraint is like "r" except that it
   7    disallows the use of r0, which means it is safe to use in places
   8    where the appearance of r0 would cause a problem due to it being
   9    read as zero. */
  10
  11 static void announce ( char* str )
  12 {
  13    printf("------ %s ------\n", str);
  14 }
  15
  16 int main ( void )
  17 {
  18   int i;
  19   char* a1 = malloc(100);
  20   char* a2 = malloc(100);
  21   strcpy(a1,"here is a stringHERE IS A STRING");
  22
  23   announce("lswi n == 8 (fe special cased)");
  24   asm volatile("li 5,0\n\t"
  25                "lswi 3,%0, 8\n\t"
  26                "stw 3,0(%1)\n\t"
  27                "stw 4,4(%1)\n\t"
  28                "stw 5,8(%1)\n\t"
  29                : : "b"(a1), "b"(a2) : "r3", "r4", "r5",
  30                                       "cc", "memory" );
  31   printf("%s\n", a2);
  32   for (i = 0; i < 12; i++)
  33     printf("%d = 0x%2x\n", i, a2[i]);
  34   printf("\n");
  35
  36
  37   announce("lswi n /= 8");
  38   asm volatile("lswi 3,%0, 9\n\t"
  39                "stw 3,0(%1)\n\t"
  40                "stw 4,4(%1)\n\t"
  41                "stw 5,8(%1)\n\t"
  42                : : "b"(a1), "b"(a2) : "r3", "r4", "r5",
  43                                       "cc", "memory" );
  44   printf("%s\n", a2);
  45   for (i = 0; i < 12; i++)
  46     printf("%d = 0x%2x\n", i, a2[i]);
  47   printf("\n");
  48
  49
  50   announce("lswx");
  51   free(a2);
  52   a2 = malloc(100);
  53   asm volatile("li  8, 11\n\t"
  54                "mtxer 8\n\t"
  55                "lswx 3,%0,%2\n\t"
  56                "stw 3,0(%1)\n\t"
  57                "stw 4,4(%1)\n\t"
  58                "stw 5,8(%1)\n\t"
  59                : : "b"(a1), "b"(a2), "b"(16) : "r3", "r4", "r5", "r8",
  60                                                "cc", "memory" );
  61   printf("%s\n", a2);
  62   for (i = 0; i < 12; i++)
  63      printf("%d = 0x%2x\n", i, a2[i]);
  64   printf("\n");
  65
  66
  67   announce("stswi n == 8 (fe special cased)");
  68   free(a2);
  69   a2 = calloc(100,1);
  70   asm volatile("lswi 3,%0, 19\n\t"
  71                "stswi 3,%1, 8\n"
  72                : : "b"(a1), "b"(a2) : "r3","r4","r5","r6","r7",
  73                                       "cc", "memory" );
  74   printf("%s\n", a2);
  75   printf("\n");
  76
  77
  78   announce("stswi n /= 8");
  79   free(a2);
  80   a2 = calloc(100,1);
  81   asm volatile("lswi 3,%0, 19\n\t"
  82                "stswi 3,%1, 17\n"
  83                : : "b"(a1), "b"(a2) : "r3","r4","r5","r6","r7",
  84                                       "cc", "memory" );
  85   printf("%s\n", a2);
  86   printf("\n");
  87
  88
  89   announce("stswx");
  90   free(a2);
  91   a2 = calloc(100,1);
  92   asm volatile("li  8, 11\n\t"
  93                "mtxer 8\n\t"
  94                "lswx  3,%0,%2\n\t"
  95                "stswx 3,%1,%2\n\t"
  96                : : "b"(a1), "b"(a2), "b"(16) : "r3", "r4", "r5", "r8",
  97                                                "cc", "memory" );
  98   printf("%s\n", a2+16);
  99   printf("\n");
 100
 101   return 0;
 102 }