1 files changed, 11 insertions, 0 deletions
diff --git a/riscv/insns/clsw.h b/riscv/insns/clsw.h
new file mode 100644
index 00000000..651f28af
--- /dev/null
+++ b/riscv/insns/clsw.h
@@ -0,0 +1,11 @@
+require_rv64;
+require_extension('P');
+reg_t x = 32 - 1;
+reg_t msb = (RS1 >> (32 - 1)) & 1;
+for (int i = 0; i < 32 - 1; i++) {
+  if (msb != ((RS1 >> (32 - i - 2)) & 1)) {
+    x = i;
+    break;
+  }
+}
+WRITE_RD(sext_xlen(x));