From e2535c6035270c8b46491c6d33285ac29362bdf7 Mon Sep 17 00:00:00 2001
From: Alexandre Oliva <oliva@adacore.com>
Date: Thu, 29 Dec 2022 14:32:53 -0300
Subject: [PATCH] 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.
---
 gcc/tree-ssa-loop-niter.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc
index fece876..1764564 100644
--- 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
-- 
2.7.4