[PATCH] Fix PR25183, ICE on valid code

[Richard Guenther]

This fixes PR25183 by making sure not to carry over overflow flags
from switch to the range list.

Bootstrapped and regtested on x86_64-unknown-linux-gnu.

Ok for 4.1, mainline and 4.0?

Thanks,
Richard.

:ADDPATCH middle-end:

2006-01-02  Richard Guenther  <rguenther@suse.de>

	* stmt.c (add_case_node): Make sure to clear overflow flags
	from ranges.

	* gcc.dg/torture/pr25183.c: New testcase.

Index: stmt.c
===================================================================
*** stmt.c	(revision 108947)
--- stmt.c	(working copy)
*************** add_case_node (struct case_node *head, t
*** 2104,2113 ****
      }
  
  
!   /* Add this label to the chain.  */
    r = ggc_alloc (sizeof (struct case_node));
!   r->low = low;
!   r->high = high;
    r->code_label = label;
    r->parent = r->left = NULL;
    r->right = head;
--- 2104,2115 ----
      }
  
  
!   /* Add this label to the chain.  Make sure to drop overflow flags.  */
    r = ggc_alloc (sizeof (struct case_node));
!   r->low = build_int_cst_wide (TREE_TYPE (low), TREE_INT_CST_LOW (low),
! 			       TREE_INT_CST_HIGH (low));
!   r->high = build_int_cst_wide (TREE_TYPE (high), TREE_INT_CST_LOW (high),
! 				TREE_INT_CST_HIGH (high));
    r->code_label = label;
    r->parent = r->left = NULL;
    r->right = head;


/* { dg-do compile } */
/* { dg-options "-pedantic" } */

enum err {
  err_IO = 0x8a450000, /* { dg-warning "int" } */
  err_NM,
  err_EOF,
  err_SE,
  err_PT
};
static enum err E_;
int error()
{
  switch (E_) {
    case err_IO : break;  /* { dg-warning "overflow" } */
    case err_NM : break;  /* { dg-warning "overflow" } */
    case err_EOF : break; /* { dg-warning "overflow" } */
    case err_SE : break;  /* { dg-warning "overflow" } */
    case err_PT : break;  /* { dg-warning "overflow" } */
    default : return 0;
  }
}