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-rw-r--r--riscv/insns/c_addw.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/riscv/insns/c_addw.h b/riscv/insns/c_addw.h
index fef554d..36559b7 100644
--- a/riscv/insns/c_addw.h
+++ b/riscv/insns/c_addw.h
@@ -1,3 +1,4 @@
require_extension('C');
require_rv64;
+require(insn.rvc_rd() != 0 && insn.rvc_rs2() != 0);
WRITE_RD(sext32(RVC_RS1 + RVC_RS2));