From 8c9f2c7ae763f21f605248baef6f512bce005bbe Mon Sep 17 00:00:00 2001
From: Yann Herklotz <git@yannherklotz.com>
Date: Sat, 7 Nov 2020 10:12:57 +0000
Subject: Add hls include file

---
 include/hls.h | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 include/hls.h

(limited to 'include/hls.h')

diff --git a/include/hls.h b/include/hls.h
new file mode 100644
index 0000000..b243fea
--- /dev/null
+++ b/include/hls.h
@@ -0,0 +1,45 @@
+#ifndef VERICERT_HLS_H
+#define VERICERT_HLS_H
+
+/*
+ * Divider C implementation for faster frequency division.
+ */
+unsigned int divider(unsigned int x, unsigned int y) {
+    unsigned int r0, q0, y0, y1;
+
+    r0 = x;
+    q0 = 0;
+    y0 = y;
+    y1 = y;
+    do {
+        y1 = 2 * y1;
+    } while (y1 <= x);
+    do {
+        y1 = y1 / 2;
+        q0 = 2 * q0;
+        if (r0 >= y1) {
+            r0 = r0 - y1;
+            q0 = q0 + 1;
+        }
+    } while ((int)y1 != (int)y0);
+    return q0;
+}
+
+/*
+ * Signed division operation for faster frequency division.
+ */
+int sdivider(int N, int D) {
+    if (D < 0) {
+        if (N < 0)
+            return divider(-N, -D);
+        else
+            return -divider(N, -D);
+    } else {
+        if (N < 0)
+            return -divider(-N, D);
+        else
+            return divider(N, D);
+    }
+}
+
+#endif
-- 
cgit