1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/crc-4.c b/gcc/testsuite/gcc.dg/crc-4.c
new file mode 100644
index 0000000..0aa1156
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/crc-4.c
@@ -0,0 +1,22 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-crc" } */
+
+#include <stdint.h>
+
+uint16_t crc16_update(uint16_t crc, uint8_t a) {
+    int i;
+    crc ^= a;
+    for (i = 0; i < 8; ++i) {
+        if (crc & 1)
+            crc = (crc >> 1) ^ 0xA001;
+        else
+            crc = (crc >> 1);
+    }
+    return crc;
+}
+
+/* { dg-final { scan-tree-dump "Attention! crc16_update 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"} } */
+