------- Comment #5 from uros at kss-loka dot si 2006-07-18 08:06 -------
This error can be tracked down to fold_negate_expr() returning NULL_TREE via
this path:
(a) constant_multiple_of() calls fold_unary_to_constant():
/* If BOT seems to be negative, try dividing by -BOT instead, and negate
the result afterwards. */
if (tree_int_cst_sign_bit (bot))
{
negate = true;
bot = fold_unary_to_constant (NEGATE_EXPR, type, bot);
}
(b) fold_unary_to_constant() calls fold_unary()
(c) fold_unary() calls fold_unary_negate() for NEGATE_EXPR:
case NEGATE_EXPR:
tem = fold_negate_expr (arg0);
if (tem)
return fold_convert (type, tem);
return NULL_TREE;
(d) fold_negate_expr() returns NULL_TREE, because:
case INTEGER_CST:
tem = fold_negate_const (t, type);
if (! TREE_OVERFLOW (tem)
|| TYPE_UNSIGNED (type)
|| ! flag_trapv)
return tem;
break;
...
default:
break;
}
return NULL_TREE;
}
>From here, I don't know, what a correct solution would be...
--
uros at kss-loka dot si changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |uros at kss-loka dot si
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28411
