none/tests/x86/bswapw.c

   1
   2 #include <stdio.h>
   3
   4 typedef  unsigned int  UInt;
   5
   6 int main ( void )
   7 {
   8
   9 #define GO16(REG,VALUE) \
  10       value = VALUE; \
  11       __asm__ __volatile__( \
  12          "pushl %%" REG " \n\t" \
  13          "movl 0(" "%0" "), %%" REG " \n\t" \
  14          ".byte 0x66 \n\t" "bswapl %%" REG "\n\t" \
  15          "movl %%" REG ", 0(" "%0" ") \n\t" \
  16          "popl %%" REG "\n" \
  17              : : "r" (&value) : REG, "memory", "cc" \
  18       ); \
  19       printf("0x%08x\n", value)
  20
  21    UInt value;
  22    GO16("eax", 0x12345678);
  23    GO16("ebx", 0x23456789);
  24    GO16("ecx", 0x3456789a);
  25    GO16("edx", 0x456789ab);
  26    GO16("esi", 0x56789abc);
  27    GO16("edi", 0x6789abcd);
  28    //GO16("ebp", 0x789abcde); // The compiler complains
  29
  30    return 0;
  31 }