Merge pull request sysprog21#48 from 2011eric/master

Enforce zero register in floating point operation
vestata · Sep 5, 2022 · cd0dc79 · cd0dc79
2 parents 6e6d4a6 + 421785f
commit cd0dc79
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/emulate.c b/emulate.c
@@ -1143,6 +1143,10 @@ static inline bool op_fp(struct riscv_t *rv, uint32_t insn)
         return false;
     }
 
+    /* enforce zero register */
+    if (rd == rv_reg_zero)
+        rv->X[rv_reg_zero] = 0;
+
     /* step over instruction */
     rv->PC += 4;
     return true;