1 files changed, 33 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/crc-3.c b/gcc/testsuite/gcc.dg/crc-3.c
new file mode 100644
index 0000000..71c57ad
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/crc-3.c
@@ -0,0 +1,33 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-crc" } */
+
+unsigned short crc16(char *data_p, unsigned short length) {
+    unsigned char i;
+    unsigned int data;
+    unsigned int crc = 0xffff;
+
+    if (length == 0)
+        return (~crc);
+
+    do {
+        for (i = 0, data = (unsigned int) 0xff & *data_p++;
+             i < 8;
+             i++, data >>= 1) {
+            if ((crc & 0x0001) ^ (data & 0x0001))
+                crc = (crc >> 1) ^ 0x8408;
+            else crc >>= 1;
+        }
+    } while (--length);
+
+    crc = ~crc;
+    data = crc;
+    crc = (crc << 8) | (data >> 8 & 0xff);
+
+    return (crc);
+}
+
+/* { dg-final { scan-tree-dump "Attention! crc16 function calculates CRC." "crc"} } */
+/* { dg-final { scan-tree-dump "Return size is 16" "crc"} } */
+/* { dg-final { scan-tree-dump "Loop iteration number is 7" "crc"} } */
+/* { dg-final { scan-tree-dump "Bit reversed" "crc"} } */
+