re PR tree-optimization/85168 (ICE in tree-ssa-coalesce.c: SSA corruption:…

re PR tree-optimization/85168 (ICE in tree-ssa-coalesce.c: SSA corruption: Unable to coalesce ssa_names which are marked as MUST COALESCE when -O2 is used)

2018-04-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85168
	* tree-ssa-sccvn.c (vn_reference_maybe_forwprop_address): Avoid
	propagating abnormals.

	* gcc.dg/torture/pr85168.c: New testcase.

From-SVN: r259068

gcc/ChangeLog

+2018-04-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85168
+	* tree-ssa-sccvn.c (vn_reference_maybe_forwprop_address): Avoid
+	propagating abnormals.
+
 2018-04-04  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* config/nds32/nds32.md (enabled): Use yes/no for this attribute.

gcc/testsuite/ChangeLog

+2018-04-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/85168
+	* gcc.dg/torture/pr85168.c: New testcase.
+
 2018-04-04  Alexandre Oliva <aoliva@redhat.com>
 
 	PR c++/84943

gcc/testsuite/gcc.dg/torture/pr85168.c

+/* { dg-do compile } */
+/* { dg-require-effective-target indirect_jumps } */
+
+typedef struct {
+    struct {
+	char a;
+    } b;
+} c;
+
+int d, f;
+c *e;
+
+extern void i(void);
+extern void sejtmp () __attribute__((returns_twice));
+
+void g(void)
+{
+  c *h = e;
+  if (f)
+    {
+      i();
+      h--;
+      if (d)
+	if (h->b.a)
+	  i();
+    }
+  if (h->b.a)
+    sejtmp();
+  e = h;
+}

gcc/tree-ssa-sccvn.c

@@ -1249,7 +1249,9 @@ vn_reference_maybe_forwprop_address (vec<vn_reference_op_s> *ops,
 	  return true;
 	}
       if (!addr_base
-	  || TREE_CODE (addr_base) != MEM_REF)
+	  || TREE_CODE (addr_base) != MEM_REF
+	  || (TREE_CODE (TREE_OPERAND (addr_base, 0)) == SSA_NAME
+	      && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (addr_base, 0))))
 	return false;
 
       off += addr_offset;
@@ -1262,6 +1264,7 @@ vn_reference_maybe_forwprop_address (vec<vn_reference_op_s> *ops,
       ptr = gimple_assign_rhs1 (def_stmt);
       ptroff = gimple_assign_rhs2 (def_stmt);
       if (TREE_CODE (ptr) != SSA_NAME
+	  || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ptr)
 	  || TREE_CODE (ptroff) != INTEGER_CST)
 	return false;