re PR tree-optimization/82276 (-O2: ICE: SSA corruption during RTL pass: expand;…

re PR tree-optimization/82276 (-O2: ICE: SSA corruption during RTL pass: expand; at tree-ssa-coalesce.c:1010)

2017-09-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82276
	PR tree-optimization/82244
	* tree-vrp.c (build_assert_expr_for): Set
	SSA_NAME_OCCURS_IN_ABNORMAL_PHI if the variable we assert on
	has it set.
	(remove_range_assertions): Revert earlier change.

	* gcc.dg/torture/pr82276.c: New testcase.

From-SVN: r253062

gcc/ChangeLog

+2017-09-21  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/82276
+	PR tree-optimization/82244
+	* tree-vrp.c (build_assert_expr_for): Set
+	SSA_NAME_OCCURS_IN_ABNORMAL_PHI if the variable we assert on
+	has it set.
+	(remove_range_assertions): Revert earlier change.
+
 2017-09-21  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	PR target/71951

gcc/testsuite/ChangeLog

 2017-09-21  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/82276
+	PR tree-optimization/82244
+	* gcc.dg/torture/pr82276.c: New testcase.
+
+2017-09-21  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/71351
 	* gfortran.dg/graphite/pr71351.f90: New testcase.
 	* gfortran.dg/graphite/interchange-3.f90: Adjust.

gcc/testsuite/gcc.dg/torture/pr82276.c

+/* { dg-do compile } */
+
+typedef struct a {
+  struct a *b;
+} a;
+
+extern int d(void);
+extern int g(void);
+extern int h(void);
+extern int _setjmp();
+extern int i(void);
+
+void c(void) {
+    1 ? d() : 0;
+    a *e;
+    while (e) {
+	e = (e == (a *) c) ? 0 : e->b;
+	while (e) {
+	    unsigned int f = 0;
+	    g();
+	    _setjmp(f);
+	    if (f & 6) {
+		;
+	    } else if (f & 2) {
+		;
+	    } else {
+		h();
+	    }
+	    i();
+	}
+    }
+}

gcc/tree-vrp.c

@@ -4520,7 +4520,12 @@ build_assert_expr_for (tree cond, tree v)
      operand of the ASSERT_EXPR.  Create it so the new name and the old one
      are registered in the replacement table so that we can fix the SSA web
      after adding all the ASSERT_EXPRs.  */
-  create_new_def_for (v, assertion, NULL);
+  tree new_def = create_new_def_for (v, assertion, NULL);
+  /* Make sure we preserve abnormalness throughout an ASSERT_EXPR chain
+     given we have to be able to fully propagate those out to re-create
+     valid SSA when removing the asserts.  */
+  if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (v))
+    SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_def) = 1;
 
   return assertion;
 }
@@ -7041,14 +7046,6 @@ remove_range_assertions (void)
 		  FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
 		    SET_USE (use_p, var);
 	      }
-	    /* But do not propagate constants as that is invalid.  */
-	    else if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (lhs))
-	      {
-		gassign *ass = gimple_build_assign (lhs, var);
-		gsi_replace (&si, ass, true);
-		gsi_next (&si);
-		continue;
-	      }
 	    else
 	      replace_uses_by (lhs, var);