1 files changed, 36 insertions, 0 deletions
diff --git a/usr/klibc/libgcc/__clzsi2.c b/usr/klibc/libgcc/__clzsi2.c
new file mode 100644
index 0000000..ebb11f0
--- /dev/null
+++ b/usr/klibc/libgcc/__clzsi2.c
@@ -0,0 +1,36 @@
+/*
+ * libgcc/__clzsi2.c
+ *
+ * Returns the leading number of 0 bits in the argument
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+
+uint32_t __clzsi2(uint32_t v)
+{
+	int p = 31;
+
+	if (v & 0xffff0000) {
+		p -= 16;
+		v >>= 16;
+	}
+	if (v & 0xff00) {
+		p -= 8;
+		v >>= 8;
+	}
+	if (v & 0xf0) {
+		p -= 4;
+		v >>= 4;
+	}
+	if (v & 0xc) {
+		p -= 2;
+		v >>= 2;
+	}
+	if (v & 0x2) {
+		p -= 1;
+		v >>= 1;
+	}
+
+	return p;
+}