[PATCH] Fix PR83685

[Richard Biener]

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2018-01-08  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/83685
        * tree-ssa-pre.c (create_expression_by_pieces): Do not insert
        references to abnormals.

        * gcc.dg/torture/pr83685.c: New testcase.

Index: gcc/tree-ssa-pre.c
===================================================================
--- gcc/tree-ssa-pre.c  (revision 256329)
+++ gcc/tree-ssa-pre.c  (working copy)
@@ -2697,6 +2697,8 @@ create_expression_by_pieces (basic_block
        that value numbering saw through.  */
     case NAME:
       folded = PRE_EXPR_NAME (expr);
+      if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (folded))
+       return NULL_TREE;
       if (useless_type_conversion_p (exprtype, TREE_TYPE (folded)))
        return folded;
       break;
Index: gcc/testsuite/gcc.dg/torture/pr83685.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr83685.c      (nonexistent)
+++ gcc/testsuite/gcc.dg/torture/pr83685.c      (working copy)
@@ -0,0 +1,20 @@
+/* { dg-do compile }  */
+
+int _setjmp (void *);
+void foo (int);
+
+void
+bar (int e, int b, char c, void *d)
+{
+  while (b)
+    {
+      if (_setjmp (d))
+       foo (e);
+      if (c)
+       {
+         e--;
+         foo (0);
+       }
+      e++;
+    }
+}