1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/i386-signbit-1.c b/gcc/testsuite/gcc.dg/i386-signbit-1.c
new file mode 100644
index 00000000000..3bdc5906b7a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/i386-signbit-1.c
@@ -0,0 +1,28 @@
+/* PR optimization/8746 */
+/* { dg-do run { target i?86-*-* } } */
+/* { dg-options "-O1 -mcpu=i586" } */
+
+extern void abort (void);
+
+unsigned char r0;
+
+int foo(int x)
+{
+  unsigned char r = x&0xf0;
+
+  if (!(r&0x80))
+  {
+    r0 = r;
+    return 0;
+  }
+  else
+    return 1;
+}
+
+int main(void)
+{
+  if (foo(0x80) != 1)
+    abort();
+
+   return 0;
+}