diff options
Diffstat (limited to 'gcc/cselib.h')
| -rw-r--r-- | gcc/cselib.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/cselib.h b/gcc/cselib.h index 3590f98..6a9d795 100644 --- a/gcc/cselib.h +++ b/gcc/cselib.h @@ -96,5 +96,24 @@ extern void cselib_preserve_value (cselib_val *); extern bool cselib_preserved_value_p (cselib_val *); extern void cselib_preserve_only_values (void); extern void cselib_preserve_cfa_base_value (cselib_val *, unsigned int); +extern void cselib_add_permanent_equiv (cselib_val *, rtx, rtx); extern void dump_cselib_table (FILE *); + +/* Return the canonical value for VAL, following the equivalence chain + towards the earliest (== lowest uid) equivalent value. */ + +static inline cselib_val * +canonical_cselib_val (cselib_val *val) +{ + cselib_val *canon; + + if (!val->locs || val->locs->next + || !val->locs->loc || GET_CODE (val->locs->loc) != VALUE + || val->uid < CSELIB_VAL_PTR (val->locs->loc)->uid) + return val; + + canon = CSELIB_VAL_PTR (val->locs->loc); + gcc_checking_assert (canonical_cselib_val (canon) == canon); + return canon; +} |