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tree-ssa-threadupdate.c (rediscover_loops_after_threading): Remove.

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* tree-ssa-threadupdate.c (rediscover_loops_after_threading):
	Remove.
	* basic-block.h: Remove the extern for
	rediscover_loops_after_threading.

From-SVN: r111734
This commit is contained in:
Kazu Hirata 2006-03-05 17:31:20 +00:00 committed by Kazu Hirata
parent d42ee77ad0
commit acfc4f0a85
3 changed files with 7 additions and 31 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2006-03-05 Kazu Hirata <kazu@codesourcery.com>
* tree-ssa-threadupdate.c (rediscover_loops_after_threading):
Remove.
* basic-block.h: Remove the extern for
rediscover_loops_after_threading.
2006-03-05 Kazu Hirata <kazu@codesourcery.com>
* recog.c (volatile_mem_p, validate_change_maybe_volatile):

4
gcc/basic-block.h
View File

@ -414,10 +414,6 @@ struct control_flow_graph GTY(())
#define BASIC_BLOCK(N) (VEC_index (basic_block, basic_block_info, (N)))
#define SET_BASIC_BLOCK(N,BB) (VEC_replace (basic_block, basic_block_info, (N), (BB)))
/* TRUE if we should re-run loop discovery after threading jumps, FALSE
otherwise. */
extern bool rediscover_loops_after_threading;
/* For iterating over basic blocks. */
#define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \
for (BB = FROM; BB != TO; BB = BB->DIR)

27
gcc/tree-ssa-threadupdate.c
View File

@ -131,8 +131,6 @@ struct redirection_data
/* Main data structure to hold information for duplicates of BB. */
static htab_t redirection_data;
bool rediscover_loops_after_threading;
/* Data structure of information to pass to hash table traversal routines. */
struct local_info
{
@ -735,30 +733,6 @@ thread_block (basic_block bb)
update_bb_profile_for_threading (e->dest, EDGE_FREQUENCY (e),
e->count, e->aux);
/* If we thread to a loop exit edge, then we will need to
rediscover the loop exit edges. While it may seem that
the new edge is a loop exit edge, that is not the case.
Consider threading the edge (5,6) to E in the CFG on the
left which creates the CFG on the right:
0<--+ 0<---+
/ \ | / \ |
1 2 | 1 2 |
/ \ | | / \ | |
3 4 | | 3 4 6--+
\ / | | \ /
5 | | 5
\ / | |
6---+ E
|
E
After threading, the edge (0, 1) is the loop exit edge and
the nodes 0, 2, 6 are the only nodes in the loop. */
if (e2->flags & EDGE_LOOP_EXIT)
rediscover_loops_after_threading = true;
/* Insert the outgoing edge into the hash table if it is not
already in the hash table. */
lookup_redirection_data (e2, e, INSERT);
@ -859,7 +833,6 @@ thread_through_all_blocks (void)
return false;
threaded_blocks = BITMAP_ALLOC (NULL);
rediscover_loops_after_threading = false;
memset (&thread_stats, 0, sizeof (thread_stats));
mark_threaded_blocks (threaded_blocks);