1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr81396.c b/gcc/testsuite/gcc.dg/tree-ssa/pr81396.c
new file mode 100644
index 00000000000..9f4a08d1c22
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr81396.c
@@ -0,0 +1,25 @@
+/* PR tree-optimization/81396 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+typedef unsigned long long uint64_t;
+
+uint64_t
+foo (uint64_t word)
+{
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_LONG_LONG__ == 8
+  const unsigned char *const ptr = (const unsigned char *) &word;
+  return ((uint64_t) ptr[0]
+	  | ((uint64_t) ptr[1] << 8)
+	  | ((uint64_t) ptr[2] << (8 * 2))
+	  | ((uint64_t) ptr[3] << (8 * 3))
+	  | ((uint64_t) ptr[4] << (8 * 4))
+	  | ((uint64_t) ptr[5] << (8 * 5))
+	  | ((uint64_t) ptr[6] << (8 * 6))
+	  | ((uint64_t) ptr[7] << (8 * 7)));
+#else
+  return word;
+#endif
+}
+
+/* { dg-final { scan-tree-dump "return word_\[0-9]*\\(D\\);" "optimized" } } */