1 files changed, 27 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/crc-12.c b/gcc/testsuite/gcc.dg/crc-12.c
new file mode 100644
index 0000000..66c6743
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/crc-12.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-crc" } */
+
+#include <stdint.h>
+
+typedef uint8_t crc;
+#define TOPBIT (1 << 7)
+
+//shift not by one
+crc
+notCrc(uint8_t const message[], int nBytes) {
+    crc remainder = 0;
+    for (int byte = 0; byte < nBytes; ++byte) {
+        remainder ^= message[byte] ;
+        for (uint8_t bit = 8; bit > 0; --bit) {
+            if (remainder & TOPBIT) {
+                remainder = (remainder << 3) ^ 1234;
+            } else {
+                remainder = (remainder << 9);
+            }
+        }
+    }
+    return (remainder);
+}
+
+/* { dg-final { scan-tree-dump-times "Attention! notCrc function calculates CRC." 0 "crc"} } */
+