[gcc r12-3385] Rename forwarder_block_p in treading code to empty_block_with_phis_p.

[gcc r12-3385] Rename forwarder_block_p in treading code to empty_block_with_phis_p.

[Aldy Hernandez]

https://gcc.gnu.org/g:020e2db0a806d8d8250776734a4ad6263a75cb06

commit r12-3385-g020e2db0a806d8d8250776734a4ad6263a75cb06
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Tue Sep 7 15:20:23 2021 +0200

    Rename forwarder_block_p in treading code to empty_block_with_phis_p.
    
    gcc/ChangeLog:
    
            * tree-ssa-threadedge.c (forwarder_block_p): Rename to...
            (empty_block_with_phis_p): ...this.
            (potentially_threadable_block): Same.
            (jump_threader::thread_through_normal_block): Same.

Diff:
---
 gcc/tree-ssa-threadedge.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/gcc/tree-ssa-threadedge.c b/gcc/tree-ssa-threadedge.c
index 3db54a199fd..3c7cdc58b93 100644
--- a/gcc/tree-ssa-threadedge.c
+++ b/gcc/tree-ssa-threadedge.c
@@ -101,11 +101,10 @@ has_phis_p (basic_block bb)
   return !gsi_end_p (gsi_start_phis (bb));
 }
 
-/* Return TRUE for a forwarder block which is defined as having PHIs
-   but no instructions.  */
+/* Return TRUE for a block with PHIs but no statements.  */
 
 static bool
-forwarder_block_p (basic_block bb)
+empty_block_with_phis_p (basic_block bb)
 {
   return gsi_end_p (gsi_start_nondebug_bb (bb)) && has_phis_p (bb);
 }
@@ -123,7 +122,7 @@ potentially_threadable_block (basic_block bb)
      to the loop header.   We want to thread through them as we can
      sometimes thread to the loop exit, which is obviously profitable.
      The interesting case here is when the block has PHIs.  */
-  if (forwarder_block_p (bb))
+  if (empty_block_with_phis_p (bb))
     return true;
 
   /* If BB has a single successor or a single predecessor, then
@@ -1008,7 +1007,7 @@ jump_threader::thread_through_normal_block (vec<jump_thread_edge *> *path,
     {
       /* First case.  The statement simply doesn't have any instructions, but
 	 does have PHIs.  */
-      if (forwarder_block_p (e->dest))
+      if (empty_block_with_phis_p (e->dest))
 	return 0;
 
       /* Second case.  */