re PR tree-optimization/81227 (ICE in get_single_symbol, at tree-vrp.c:799)

2017-06-28  Richard Biener  <rguenther@suse.de>

	PR middle-end/81227
	* fold-const.c (negate_expr_p): Use TYPE_UNSIGNED, not
	TYPE_OVERFLOW_WRAPS.
	* match.pd (negate_expr_p): Likewise.
	* tree-ssa-reassoc.c (optimize_range_tests_diff): Use
	fold_build2, not fold_binary.

	* gcc.dg/pr81227.c: New testcase.

From-SVN: r249742

gcc/ChangeLog

+2017-06-28  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/81227
+	* fold-const.c (negate_expr_p): Use TYPE_UNSIGNED, not
+	TYPE_OVERFLOW_WRAPS.
+	* match.pd (negate_expr_p): Likewise.
+	* tree-ssa-reassoc.c (optimize_range_tests_diff): Use
+	fold_build2, not fold_binary.
+
 2017-06-28  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* config/aarch64/aarch64 (aarch64_expand_mov_immediate):

gcc/fold-const.c

@@ -383,7 +383,7 @@ negate_expr_p (tree t)
   switch (TREE_CODE (t))
     {
     case INTEGER_CST:
-      if (INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_WRAPS (type))
+      if (INTEGRAL_TYPE_P (type) && TYPE_UNSIGNED (type))
 	return true;
 
       /* Check that -CST will not overflow type.  */

gcc/match.pd

@@ -914,7 +914,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 (match negate_expr_p
  INTEGER_CST
  (if ((INTEGRAL_TYPE_P (type)
-       && TYPE_OVERFLOW_WRAPS (type))
+       && TYPE_UNSIGNED (type))
       || (!TYPE_OVERFLOW_SANITIZED (type)
 	  && may_negate_without_overflow_p (t)))))
 (match negate_expr_p

gcc/testsuite/ChangeLog

+2017-06-28  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/81227
+	* gcc.dg/pr81227.c: New testcase.
+
 2017-06-28  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/81193

gcc/testsuite/gcc.dg/pr81227.c

+/* Copy of gcc.c-torture/compile/pr80443.c  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fwrapv" } */
+
+struct S { int a : 1; } b, c;
+signed char d, e, f;
+
+void
+foo ()
+{ 
+  while (f)
+    { 
+      signed char g = b.a;
+      if (g)
+	b.a = ~(1 + (d || c.a));
+      if (b.a < g && b.a)
+	g = 0;
+      if (b.a > c.a)
+	b.a = g;
+      c.a = e;
+    }
+}

gcc/tree-ssa-reassoc.c

@@ -2561,7 +2561,7 @@ optimize_range_tests_diff (enum tree_code opcode, tree type,
   tem2 = fold_convert (type, tem2);
   lowi = fold_convert (type, lowi);
   mask = fold_build1 (BIT_NOT_EXPR, type, tem1);
-  tem1 = fold_binary (MINUS_EXPR, type,
+  tem1 = fold_build2 (MINUS_EXPR, type,
 		      fold_convert (type, rangei->exp), lowi);
   tem1 = fold_build2 (BIT_AND_EXPR, type, tem1, mask);
   lowj = build_int_cst (type, 0);