re PR tree-optimization/31130 (VRP no longer derives range for division after negation)

2017-05-04  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/31130
	* tree-vrp.c (needs_overflow_infinity): Remove as always returning
	false.
	(supports_overflow_infinity): Likewise.
	(is_negative_overflow_infinity): Likewise.
	(is_positive_overflow_infinity): Likewise.
	(is_overflow_infinity): Likewise.
	(stmt_overflow_infinity): Likewise.
	(overflow_infinity_range_p): Likewise.
	(usable_range_p): Remove as always returning true.
	(make_overflow_infinity): Remove.
	(negative_overflow_infinity): Likewise.
	(positive_overflow_infinity): Likewise.
	(avoid_overflow_infinity): Likewise.
	(set_value_range): Adjust accordingly.
	(set_value_range_to_nonnegative): Likewise, remove now unused
	overflow_infinity arg.
	(vrp_operand_equal_p): Adjust.
	(update_value_range): Likewise.
	(range_int_cst_singleton_p): Likewise.
	(operand_less_p): Likewise.
	(compare_values_warnv): Likewise.
	(extract_range_for_var_from_comparison_expr): Likewise.
	(vrp_int_const_binop): Likewise.
	(zero_nonzero_bits_from_vr): Likewise.
	(extract_range_from_multiplicative_op_1): Likewise.
	(extract_range_from_binary_expr_1): Likewise.
	(extract_range_from_unary_expr): Likewise.
	(extract_range_from_comparison): Likewise.
	(extract_range_basic): Likewise.
	(adjust_range_with_scev): Likewise.
	(compare_ranges): Likewise.
	(compare_range_with_value): Likewise.
	(dump_value_range): Likewise.
	(test_for_singularity): Likewise, remove strict_overflow_p parameter
	never used.
	(simplify_cond_using_ranges): Adjust.

	* gcc.dg/Wstrict-overflow-12.c: XFAIL.
	* gcc.dg/Wstrict-overflow-13.c: Likewise.
	* gcc.dg/Wstrict-overflow-21.c: Likewise.
	* gcc.dg/pr52904.c: Remove XFAIL.
	* gcc.dg/tree-ssa/vrp114.c: New testcase.

From-SVN: r247578

gcc/ChangeLog

+2017-05-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/31130
+	* tree-vrp.c (needs_overflow_infinity): Remove as always returning
+	false.
+	(supports_overflow_infinity): Likewise.
+	(is_negative_overflow_infinity): Likewise.
+	(is_positive_overflow_infinity): Likewise.
+	(is_overflow_infinity): Likewise.
+	(stmt_overflow_infinity): Likewise.
+	(overflow_infinity_range_p): Likewise.
+	(usable_range_p): Remove as always returning true.
+	(make_overflow_infinity): Remove.
+	(negative_overflow_infinity): Likewise.
+	(positive_overflow_infinity): Likewise.
+	(avoid_overflow_infinity): Likewise.
+	(set_value_range): Adjust accordingly.
+	(set_value_range_to_nonnegative): Likewise, remove now unused
+	overflow_infinity arg.
+	(vrp_operand_equal_p): Adjust.
+	(update_value_range): Likewise.
+	(range_int_cst_singleton_p): Likewise.
+	(operand_less_p): Likewise.
+	(compare_values_warnv): Likewise.
+	(extract_range_for_var_from_comparison_expr): Likewise.
+	(vrp_int_const_binop): Likewise.
+	(zero_nonzero_bits_from_vr): Likewise.
+	(extract_range_from_multiplicative_op_1): Likewise.
+	(extract_range_from_binary_expr_1): Likewise.
+	(extract_range_from_unary_expr): Likewise.
+	(extract_range_from_comparison): Likewise.
+	(extract_range_basic): Likewise.
+	(adjust_range_with_scev): Likewise.
+	(compare_ranges): Likewise.
+	(compare_range_with_value): Likewise.
+	(dump_value_range): Likewise.
+	(test_for_singularity): Likewise, remove strict_overflow_p parameter
+	never used.
+	(simplify_cond_using_ranges): Adjust.
+
 2017-05-04  Pekka Jääskeläinen  <pekka.jaaskelainen@parmance.com>
 
 	* brig-builtins.def: Added a builtin for class_f64.

gcc/testsuite/ChangeLog

+2017-05-04  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/31130
+	* gcc.dg/Wstrict-overflow-12.c: XFAIL.
+	* gcc.dg/Wstrict-overflow-13.c: Likewise.
+	* gcc.dg/Wstrict-overflow-21.c: Likewise.
+	* gcc.dg/pr52904.c: Remove XFAIL.
+	* gcc.dg/tree-ssa/vrp114.c: New testcase.
+
 2017-05-03  Jeff Law  <law@redhat.com>
 
 	PR tree-optimization/78496

gcc/testsuite/gcc.dg/Wstrict-overflow-12.c

@@ -10,7 +10,7 @@ int
 foo ()
 {
   int i, bits;
-  for (i = 1, bits = 1; i > 0; i += i) /* { dg-warning "assuming signed overflow does not occur" "correct warning" } */
+  for (i = 1, bits = 1; i > 0; i += i) /* { dg-warning "assuming signed overflow does not occur" "correct warning" { xfail *-*-* } } */
     ++bits;
   return bits;
 }

gcc/testsuite/gcc.dg/Wstrict-overflow-13.c

@@ -11,7 +11,7 @@ int
 foo ()
 {
   int j;
-  for (j = 1; 0 < j; j *= 2) /* { dg-warning "assuming signed overflow does not occur" "correct warning" } */
+  for (j = 1; 0 < j; j *= 2) /* { dg-warning "assuming signed overflow does not occur" "correct warning" { xfail *-*-* } } */
     if (! bigtime_test (j))
       return 1;
   return 0;

gcc/testsuite/gcc.dg/Wstrict-overflow-21.c

@@ -5,7 +5,7 @@ int
 foo ()
 {
   int i, bits;
-  for (i = 1, bits = 1; i > 0; i += i) /* { dg-warning "assuming signed overflow does not occur" "correct warning" } */
+  for (i = 1, bits = 1; i > 0; i += i) /* { dg-warning "assuming signed overflow does not occur" "correct warning" { xfail *-*-* } } */
     ++bits;
   return bits;
 }

gcc/testsuite/gcc.dg/pr52904.c

@@ -14,7 +14,7 @@ wait_reading_process_output (void)
 	nfds++;
     }
 
-  if (nfds < 0) /* { dg-bogus "assuming signed overflow does not occur" "" { xfail *-*-* } } */
+  if (nfds < 0) /* { dg-bogus "assuming signed overflow does not occur" "" } */
     return 1;
   return 0;
 }

gcc/testsuite/gcc.dg/tree-ssa/vrp114.c

+/* { dg-do link } */
+/* { dg-options "-O2 -fdump-tree-fre1 -fdump-tree-evrp" } */
+
+extern void link_error ();
+void foo (int a)
+{
+  if (a < 0)
+    {
+      int y;
+      a = -a;
+      y  = a / 7;
+      y = y * 2;
+      if (y > 1 << 30)
+	link_error ();
+    }
+}
+
+int main()
+{
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "link_error" 1 "fre1" } } */
+/* { dg-final { scan-tree-dump-times "link_error" 0 "evrp" } } */