riscv/insns/csrrc.h

   1 bool write = insn.rs1() != 0;
   2 int csr = validate_csr(insn.csr(), write);
   3 reg_t old = p->get_csr(csr);
   4 if (write) {
   5   p->set_csr(csr, old & ~RS1);
   6 }
   7 WRITE_RD(sext_xlen(old));