re PR tree-optimization/82102 (ICE: Segmentation fault in…

re PR tree-optimization/82102 (ICE: Segmentation fault in /home/arnd/git/gcc/gcc/tree-ssa-pre.c:4863)

2017-09-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82102
	* tree-ssa-pre.c (fini_eliminate): Check if lhs is NULL.

	* gcc.dg/torture/pr82102.c: New testcase.

From-SVN: r251692

gcc/ChangeLog

+2017-09-05  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/82102
+	* tree-ssa-pre.c (fini_eliminate): Check if lhs is NULL.
+
 2017-09-05  Martin Liska  <mliska@suse.cz>
 
 	PR tree-optimization/82032

gcc/testsuite/ChangeLog

+2017-09-05  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/82102
+	* gcc.dg/torture/pr82102.c: New testcase.
+
 2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* testsuite/gnat.dg/array29.ad[sb]: New test.

gcc/testsuite/gcc.dg/torture/pr82102.c

+/* { dg-do compile } */
+
+void *a, *b;
+struct pt3_i2cbuf {
+    int num_cmds;
+} c;
+void *memcpy(void *, void *, __SIZE_TYPE__);
+void put_stop();
+void translate(struct pt3_i2cbuf *p1, int p2)
+{
+  p1->num_cmds = 0;
+  if (p2)
+    put_stop();
+}
+void pt3_i2c_master_xfer(int p1)
+{
+  translate(&c, p1);
+  memcpy(a, b, c.num_cmds);
+  for (; p1;)
+    ;
+}

gcc/tree-ssa-pre.c

@@ -4860,6 +4860,7 @@ fini_eliminate (void)
 	lhs = gimple_get_lhs (stmt);
 
       if (inserted_exprs
+	  && lhs
 	  && TREE_CODE (lhs) == SSA_NAME
 	  && bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (lhs)))
 	continue;