diff options
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 07e743a..0f9c34f 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -3043,6 +3043,57 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) || POINTER_TYPE_P (itype)) && wi::eq_p (wi::to_wide (int_cst), wi::max_value (itype)))))) +/* Unsigned Saturation Add */ +(match (usadd_left_part_1 @0 @1) + (plus:c @0 @1) + (if (INTEGRAL_TYPE_P (type) + && TYPE_UNSIGNED (TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@1))))) + +(match (usadd_left_part_2 @0 @1) + (realpart (IFN_ADD_OVERFLOW:c @0 @1)) + (if (INTEGRAL_TYPE_P (type) + && TYPE_UNSIGNED (TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@1))))) + +(match (usadd_right_part_1 @0 @1) + (negate (convert (lt (plus:c @0 @1) @0))) + (if (INTEGRAL_TYPE_P (type) + && TYPE_UNSIGNED (TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@1))))) + +(match (usadd_right_part_1 @0 @1) + (negate (convert (gt @0 (plus:c @0 @1)))) + (if (INTEGRAL_TYPE_P (type) + && TYPE_UNSIGNED (TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@1))))) + +(match (usadd_right_part_2 @0 @1) + (negate (convert (ne (imagpart (IFN_ADD_OVERFLOW:c @0 @1)) integer_zerop))) + (if (INTEGRAL_TYPE_P (type) + && TYPE_UNSIGNED (TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@0)) + && types_match (type, TREE_TYPE (@1))))) + +/* We cannot merge or overload usadd_left_part_1 and usadd_left_part_2 + because the sub part of left_part_2 cannot work with right_part_1. + For example, left_part_2 pattern focus one .ADD_OVERFLOW but the + right_part_1 has nothing to do with .ADD_OVERFLOW. */ + +/* Unsigned saturation add, case 1 (branchless): + SAT_U_ADD = (X + Y) | - ((X + Y) < X) or + SAT_U_ADD = (X + Y) | - (X > (X + Y)). */ +(match (unsigned_integer_sat_add @0 @1) + (bit_ior:c (usadd_left_part_1 @0 @1) (usadd_right_part_1 @0 @1))) + +/* Unsigned saturation add, case 2 (branchless with .ADD_OVERFLOW). */ +(match (unsigned_integer_sat_add @0 @1) + (bit_ior:c (usadd_left_part_2 @0 @1) (usadd_right_part_2 @0 @1))) + /* x > y && x != XXX_MIN --> x > y x > y && x == XXX_MIN --> false . */ (for eqne (eq ne) |