* tree-vrp.c (extract_range_from_unary_expr): Derive ranges for

	type conversions of a VR_VARYING source to a wider type.

	* gcc.dg/tree-ssa/vrp28.c: New test.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@112256 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 32 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/vrp28.c b/gcc/testsuite/gcc.dg/tree-ssa/vrp28.c
new file mode 100644
index 00000000000..6b2a1fd6b75
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/vrp28.c
@@ -0,0 +1,32 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1" } */
+
+int f(_Bool a)
+{
+  int t = a;
+  if (t != 2)
+   return 0;
+  return 1;
+}
+
+int f1(unsigned char a)
+{
+  int t = a;
+  if (t != 256)
+   return 0;
+  return 1;
+}
+
+int f3 (unsigned char c)
+{
+  int i = c;
+  if (i < 0 || i > 255)
+    return -1;
+  else
+    return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "if " 0 "vrp1" } } * /
+/* { dg-final { cleanup-tree-dump "vrp1" } } */
+
+