diff options
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index e9571d158a5..2057dccba46 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -31,7 +31,7 @@ along with GCC; see the file COPYING3. If not see /* Simplifications of operations with one constant operand and - simplifications to constants. */ + simplifications to constants or single values. */ (for op (plus pointer_plus minus bit_ior bit_xor) (simplify @@ -88,6 +88,22 @@ along with GCC; see the file COPYING3. If not see (bit_xor @0 @0) { build_zero_cst (type); }) +/* Canonicalize X ^ ~0 to ~X. */ +(simplify + (bit_xor @0 integer_all_onesp@1) + (bit_not @0)) + +/* x & ~0 -> x */ +(simplify + (bit_and @0 integer_all_onesp) + (non_lvalue @0)) + +/* x & x -> x, x | x -> x */ +(for bitop (bit_and bit_ior) + (simplify + (bitop @0 @0) + (non_lvalue @0))) + /* Simplifications of conversions. */ |