diff options
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 84db1ee7360..9db48bda047 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -2456,9 +2456,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (if (INTEGRAL_TYPE_P (type)) (mult @0 { build_int_cst (type, 2); })))) +/* 0 - X -> -X. */ (simplify (minus integer_zerop @1) (negate @1)) +(simplify + (pointer_diff integer_zerop @1) + (negate (convert @1))) /* (ARG0 - ARG1) is the same as (-ARG1 + ARG0). So check whether ARG0 is zero and X + ARG0 reduces to X, since that would mean |