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cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right away if seen. 

* cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right
	away if seen.

From-SVN: r184169
This commit is contained in:
Jakub Jelinek 2012-02-13 21:14:25 +01:00 committed by Jakub Jelinek
parent 4228697645
commit 67b977ada8
2 changed files with 14 additions and 1 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
2012-02-13 Jakub Jelinek <jakub@redhat.com> 2012-02-13 Jakub Jelinek <jakub@redhat.com>
* cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right
away if seen.
* cselib.c (dump_cselib_val): Don't assume l->setting_insn is * cselib.c (dump_cselib_val): Don't assume l->setting_insn is
non-NULL. non-NULL.

12
gcc/cselib.c
View File

@ -1372,8 +1372,18 @@ expand_loc (struct elt_loc_list *p, struct expand_value_data *evd,
unsigned int regno = UINT_MAX; unsigned int regno = UINT_MAX;
struct elt_loc_list *p_in = p; 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 /* Avoid infinite recursion trying to expand a reg into a
the same reg. */ the same reg. */
if ((REG_P (p->loc)) if ((REG_P (p->loc))