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tree-vrp.c (avoid_overflow_infinity): New static function, broken out of set_value_range_to_value. 

* tree-vrp.c (avoid_overflow_infinity): New static function,
	broken out of set_value_range_to_value.
	(set_value_range_to_value): Call avoid_overflow_infinity.
	(extract_range_from_assert): Likewise.

From-SVN: r124981
This commit is contained in:
Ian Lance Taylor 2007-05-23 05:53:21 +00:00 committed by Ian Lance Taylor
parent 24016fdb16
commit b80cca7b47
2 changed files with 31 additions and 13 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2007-05-22 Ian Lance Taylor <iant@google.com>
* tree-vrp.c (avoid_overflow_infinity): New static function,
broken out of set_value_range_to_value.
(set_value_range_to_value): Call avoid_overflow_infinity.
(extract_range_from_assert): Likewise.
2007-05-22 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR middle-end/31095

37
gcc/tree-vrp.c
View File

@ -201,6 +201,27 @@ is_overflow_infinity (tree val)
|| operand_equal_p (val, TYPE_MIN_VALUE (TREE_TYPE (val)), 0)));
}
/* If VAL is now an overflow infinity, return VAL. Otherwise, return
the same value with TREE_OVERFLOW clear. This can be used to avoid
confusing a regular value with an overflow value. */
static inline tree
avoid_overflow_infinity (tree val)
{
if (!is_overflow_infinity (val))
return val;
if (operand_equal_p (val, TYPE_MAX_VALUE (TREE_TYPE (val)), 0))
return TYPE_MAX_VALUE (TREE_TYPE (val));
else
{
#ifdef ENABLE_CHECKING
gcc_assert (operand_equal_p (val, TYPE_MIN_VALUE (TREE_TYPE (val)), 0));
#endif
return TYPE_MIN_VALUE (TREE_TYPE (val));
}
}
/* Return whether VAL is equal to the maximum value of its type. This
will be true for a positive overflow infinity. We can't do a
@ -361,19 +382,7 @@ static inline void
set_value_range_to_value (value_range_t *vr, tree val, bitmap equiv)
{
gcc_assert (is_gimple_min_invariant (val));
if (is_overflow_infinity (val))
{
if (operand_equal_p (val, TYPE_MAX_VALUE (TREE_TYPE (val)), 0))
val = TYPE_MAX_VALUE (TREE_TYPE (val));
else
{
#ifdef ENABLE_CHECKING
gcc_assert (operand_equal_p (val,
TYPE_MIN_VALUE (TREE_TYPE (val)), 0));
#endif
val = TYPE_MIN_VALUE (TREE_TYPE (val));
}
}
val = avoid_overflow_infinity (val);
set_value_range (vr, VR_RANGE, val, val, equiv);
}
@ -1103,6 +1112,8 @@ extract_range_from_assert (value_range_t *vr_p, tree expr)
cond_code = swap_tree_comparison (TREE_CODE (cond));
}
limit = avoid_overflow_infinity (limit);
type = TREE_TYPE (limit);
gcc_assert (limit != var);