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#include "io.h" int main(void) { long long rd, rs, rt; long long result; rs = 0x12345678; rt = 0x87654321; result = 0x56788765; __asm ("packrl.ph %0, %1, %2\n\t" : "=r"(rd) : "r"(rs), "r"(rt) ); if (result != rd) { printf("packrl.ph wrong\n"); return -1; } return 0; }