1 files changed, 15 insertions, 0 deletions
diff --git a/emulator/bits.h b/emulator/bits.h
new file mode 100644
index 0000000..8d4bdff
--- /dev/null
+++ b/emulator/bits.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+static inline uint32_t sign_extend(uint32_t word, uint32_t size)
+{
+    const uint32_t mask = 1U << (size - 1);
+    return (word ^ mask) - mask;
+}
+
+static inline uint64_t sign_extend_64(uint64_t word, uint32_t size)
+{
+    const uint64_t mask = 1ULL << (size - 1);
+    return (word ^ mask) - mask;
+}