#include "io.h" int main(void) { long long rd, rt; long long result; rt = 0x87654321; result = 0xFFFFFFFF87650000; __asm ("preceq.w.phl %0, %1\n\t" : "=r"(rd) : "r"(rt) ); if (result != rd) { printf("preceq.w.phl wrong\n"); return -1; } return 0; }