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tree.h (TYPE_OVERFLOW_SANITIZED): Define.

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* tree.h (TYPE_OVERFLOW_SANITIZED): Define.
	* fold-const.c (fold_binary_loc): Use it.
	* match.pd: Likewise.

From-SVN: r217470
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Marek Polacek 2014-11-13 10:17:51 +00:00 committed by Marek Polacek
parent 882de21478
commit 6a4f06787f
4 changed files with 16 additions and 12 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-11-13 Marek Polacek <polacek@redhat.com>
* tree.h (TYPE_OVERFLOW_SANITIZED): Define.
* fold-const.c (fold_binary_loc): Use it.
* match.pd: Likewise.
2014-11-14 Kirill Yukhin <kirill.yukhin@intel.com>
* gcc/lra-lives.c (struct bb_data): Rename to ...

4
gcc/fold-const.c
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@ -10516,9 +10516,7 @@ fold_binary_loc (location_t loc,
/* A - B -> A + (-B) if B is easily negatable. */
if (negate_expr_p (arg1)
&& (!INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type)
|| (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0)
&& !TYPE_OVERFLOW_SANITIZED (type)
&& ((FLOAT_TYPE_P (type)
/* Avoid this transformation if B is a positive REAL_CST. */
&& (TREE_CODE (arg1) != REAL_CST

12
gcc/match.pd
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@ -285,26 +285,20 @@ along with GCC; see the file COPYING3. If not see
/* Apply STRIP_NOPS on @0 and the negate. */
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@1))
&& (!INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type)
|| (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0))
&& !TYPE_OVERFLOW_SANITIZED (type))
(minus (convert @0) (convert @1))))
/* A - (-B) -> A + B */
(simplify
(minus (convert1? @0) (convert2? (negate @1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@1))
&& (!INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type)
|| (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0))
&& !TYPE_OVERFLOW_SANITIZED (type))
(plus (convert @0) (convert @1))))
/* -(-A) -> A */
(simplify
(negate (convert? (negate @1)))
(if (tree_nop_conversion_p (type, TREE_TYPE (@1))
&& (!INTEGRAL_TYPE_P (type)
|| TYPE_OVERFLOW_WRAPS (type)
|| (flag_sanitize & SANITIZE_SI_OVERFLOW) == 0))
&& !TYPE_OVERFLOW_SANITIZED (type))
(convert @1)))
/* We can't reassociate floating-point or fixed-point plus or minus

6
gcc/tree.h
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@ -789,6 +789,12 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int,
#define TYPE_OVERFLOW_TRAPS(TYPE) \
(!TYPE_UNSIGNED (TYPE) && flag_trapv)
/* True if an overflow is to be preserved for sanitization. */
#define TYPE_OVERFLOW_SANITIZED(TYPE) \
(INTEGRAL_TYPE_P (TYPE) \
&& !TYPE_OVERFLOW_WRAPS (TYPE) \
&& (flag_sanitize & SANITIZE_SI_OVERFLOW))
/* True if pointer types have undefined overflow. */
#define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)