1 files changed, 56 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/fold-eqandshift-1.c b/gcc/testsuite/gcc.dg/fold-eqandshift-1.c
new file mode 100644
index 000000000..055f398af
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/fold-eqandshift-1.c
@@ -0,0 +1,56 @@
+/* PR middle-end/21137  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-original" } */
+extern void foo();
+
+void test1(int a)
+{
+  if ((a >> 3) & 1)
+    foo ();
+}
+
+void test2(int b)
+{
+  if ((b >> 3) & 4)
+    foo ();
+}
+
+int test3(int c)
+{
+  return (c >> 3) & 1;
+}
+
+int test4(int d)
+{
+  return (d >> 3) & 4;
+}
+
+#if __INT_MAX__ == 32767
+#define INT_BITS 16
+#elif __INT_MAX__ == 2147483647
+#define INT_BITS 32
+#elif __INT_MAX__ == 9223372036854775807
+#define INT_BITS 64
+#else
+#error Please add support for your target here.
+#endif
+
+void test5(int e)
+{
+  if ((e >> (INT_BITS - 1)) & 64)
+    foo();
+}
+
+void test6(unsigned int f)
+{
+  if ((f >> (INT_BITS - 1)) & 64)
+    foo();
+}
+
+/* { dg-final { scan-tree-dump-times "\\(a \& 8\\) != 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "\\(b \& 32\\) != 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "c >> 3 \& 1" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "d >> 3 \& 4" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "e < 0" 1 "original" } } */
+/* { dg-final { scan-tree-dump-times "if \\(0\\)" 1 "original" } } */
+/* { dg-final { cleanup-tree-dump "original" } } */