* match.pd (bit_and (plus/minus (convert @0) (convert @1) mask): New

	simplifier to narrow arithmetic.
	* generic-match-head.c: (types_match, single_use): New functions.
	* gimple-match-head.c: (types_match, single_use): New functions.

	* gcc.dg/tree-ssa/shorten-1.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222877 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 16 insertions, 0 deletions

diff --git a/gcc/generic-match-head.c b/gcc/generic-match-head.c
index daa56aa370e..efaa2d8b7ce 100644
--- a/gcc/generic-match-head.c
+++ b/gcc/generic-match-head.c
@@ -70,4 +70,20 @@ along with GCC; see the file COPYING3.  If not see
 #include "dumpfile.h"
 #include "generic-match.h"
 
+/* Routine to determine if the types T1 and T2 are effectively
+   the same for GENERIC.  */
 
+static inline bool
+types_match (tree t1, tree t2)
+{
+  return TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2);
+}
+
+/* Return if T has a single use.  For GENERIC, we assume this is
+   always true.  */
+
+static inline bool
+single_use (tree t ATTRIBUTE_UNUSED)
+{
+  return true;
+}