qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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byte_reverse.c (394B)

      1 #include <assert.h>
      2 
      3 int main(void)
      4 {
      5     unsigned long var;
      6 
      7     var = 0xFEDCBA9876543210;
      8     asm("brh %0, %0" : "+r"(var));
      9     assert(var == 0xDCFE98BA54761032);
     10 
     11     var = 0xFEDCBA9876543210;
     12     asm("brw %0, %0" : "+r"(var));
     13     assert(var == 0x98BADCFE10325476);
     14 
     15     var = 0xFEDCBA9876543210;
     16     asm("brd %0, %0" : "+r"(var));
     17     assert(var == 0x1032547698BADCFE);
     18 
     19     return 0;
     20 }
     21