diff options
Diffstat (limited to 'gcc/cselib.c')
| -rw-r--r-- | gcc/cselib.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/cselib.c b/gcc/cselib.c index a2fdef7dbe3..d060c274562 100644 --- a/gcc/cselib.c +++ b/gcc/cselib.c @@ -1237,8 +1237,18 @@ expand_loc (struct elt_loc_list *p, struct expand_value_data *evd, unsigned int regno = UINT_MAX; struct elt_loc_list *p_in = p; - for (; p; p = p -> next) + for (; p; p = p->next) { + /* Return these right away to avoid returning stack pointer based + expressions for frame pointer and vice versa, which is something + that would confuse DSE. See the comment in cselib_expand_value_rtx_1 + for more details. */ + if (REG_P (p->loc) + && (REGNO (p->loc) == STACK_POINTER_REGNUM + || REGNO (p->loc) == FRAME_POINTER_REGNUM + || REGNO (p->loc) == HARD_FRAME_POINTER_REGNUM + || REGNO (p->loc) == cfa_base_preserved_regno)) + return p->loc; /* Avoid infinite recursion trying to expand a reg into a the same reg. */ if ((REG_P (p->loc)) |