1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr15826.c b/gcc/testsuite/gcc.dg/tree-ssa/pr15826.c
new file mode 100644
index 00000000000..99ac0e2cc58
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr15826.c
@@ -0,0 +1,36 @@
+/* PR tree-optimization/15826 - don't use "if" to extract a single bit
+   bit-field */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+struct s {
+  unsigned int bit : 1;
+};
+
+unsigned int
+foo (struct s *p)
+{
+  if (p->bit)
+    return 1;
+  else
+    return 0;
+}
+
+unsigned int
+bar (struct s *p)
+{
+  return (unsigned int) (p->bit);
+}
+
+unsigned int
+andrew (struct s *p)
+{
+  int i;
+  if (p->bit)
+    i = 1;
+  else
+    i = 0;
+  return i;
+}
+
+/* { dg-final { scan-tree-dump-times " & | goto " 0 "optimized" } } */