ssa-loop-niter: skip caching of null operands

When a TREE_OPERAND is NULL, do not cache it.

for  gcc/ChangeLog

	* tree-ssa-loop-niter.cc (expand_simple_operands): Refrain
	from caching NULL TREE_OPERANDs.

diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc
index fece876..1764564 100644 (file)
--- a/gcc/tree-ssa-loop-niter.cc
+++ b/gcc/tree-ssa-loop-niter.cc
@@ -2325,6 +2325,8 @@ expand_simple_operations (tree expr, tree stop, hash_map<tree, tree> &cache)
       for (i = 0; i < n; i++)
        {
          e = TREE_OPERAND (expr, i);
+         if (!e)
+           continue;
          /* SCEV analysis feeds us with a proper expression
             graph matching the SSA graph.  Avoid turning it
             into a tree here, thus handle tree sharing