* 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, 18 insertions, 0 deletions

diff --git a/gcc/gimple-match-head.c b/gcc/gimple-match-head.c
index c7b2f957bac..7b9348b53ec 100644
--- a/gcc/gimple-match-head.c
+++ b/gcc/gimple-match-head.c
@@ -861,3 +861,21 @@ do_valueize (tree (*valueize)(tree), tree op)
   return op;
 }
 
+/* Routine to determine if the types T1 and T2 are effectively
+   the same for GIMPLE.  */
+
+static inline bool
+types_match (tree t1, tree t2)
+{
+  return types_compatible_p (t1, t2);
+}
+
+/* Return if T has a single use.  For GIMPLE, we also allow any
+   non-SSA_NAME (ie constants) and zero uses to cope with uses
+   that aren't linked up yet.  */
+
+static inline bool
+single_use (tree t)
+{
+  return TREE_CODE (t) != SSA_NAME || has_zero_uses (t) || has_single_use (t);
+}