if (VM.VerifyAssertions) VM.assert(fits(SI, 16));
if (VM.VerifyAssertions) VM._assert(fits(SI, 16));
  final void emitAIr (int RT, int RA, int SI) {    if (VM.VerifyAssertions) VM.assert(fits(SI, 16));    INSTRUCTION mi = AIrtemplate | RT<<21 | RA<<16 | (SI & 0xFFFF);    if (VM.TraceAssembler)      asm(mIP, mi, "ai.", RT, RA, signedHex(SI));    mIP++;    mc.addInstruction(mi);  }