[PATCH] Fix PR70747

[Richard Biener]

I am testing the following (obvious) patch to fix PR70747.

Richard.

2016-04-21  Richard Biener  <rguent...@suse.de>

        PR middle-end/70747
        * fold-const.c (fold_comparison): Return properly typed
        constant boolean.

        * gcc.dg/pr70747.c: New testcase.

Index: gcc/fold-const.c
===================================================================
*** gcc/fold-const.c    (revision 235305)
--- gcc/fold-const.c    (working copy)
*************** fold_comparison (location_t loc, enum tr
*** 8676,8686 ****
            case EQ_EXPR:
            case LE_EXPR:
            case LT_EXPR:
!             return boolean_false_node;
            case GE_EXPR:
            case GT_EXPR:
            case NE_EXPR:
!             return boolean_true_node;
            default:
              gcc_unreachable ();
            }
--- 8686,8696 ----
            case EQ_EXPR:
            case LE_EXPR:
            case LT_EXPR:
!             return constant_boolean_node (false, type);
            case GE_EXPR:
            case GT_EXPR:
            case NE_EXPR:
!             return constant_boolean_node (true, type);
            default:
              gcc_unreachable ();
            }
Index: gcc/testsuite/gcc.dg/pr70747.c
===================================================================
*** gcc/testsuite/gcc.dg/pr70747.c      (revision 0)
--- gcc/testsuite/gcc.dg/pr70747.c      (working copy)
***************
*** 0 ****
--- 1,10 ----
+ /* { dg-do compile } */
+ /* { dg-options "-pedantic" } */
+ 
+ int *a, b;
+ 
+ void fn1 ()
+ {
+   a = __builtin_malloc (sizeof(int)*2); 
+   b = &a[1] == (0, 0); /* { dg-warning "comparison between pointer and 
integer" } */
+ }