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* cfgcleanup.c (try_forward_edges): Allow multiple jump threading. 

From-SVN: r48563
This commit is contained in:
Jan Hubicka 2002-01-05 11:52:54 +01:00 committed by Jan Hubicka
parent d83bb9f778
commit 1c57041833
2 changed files with 18 additions and 6 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Sat Jan 5 11:52:05 CET 2002 Jan Hubicka <jh@suse.cz>
* cfgcleanup.c (try_forward_edges): Allow multiple jump threading.
2002-01-05 Neil Booth <neil@daikokuya.demon.co.uk>
* doc/cppinternals.texi: Update.

20
gcc/cfgcleanup.c
View File

@ -369,7 +369,8 @@ try_forward_edges (mode, b)
int mode;
{
bool changed = false;
edge e, next, threaded_edge;
edge e, next, *threaded_edges = NULL;
int nthreaded_edges = 0;
for (e = b->succ; e; e = next)
{
@ -406,13 +407,17 @@ try_forward_edges (mode, b)
/* Allow to thread only over one edge at time to simplify updating
of probabilities. */
else if ((mode & CLEANUP_THREADING) && !threaded)
else if (mode & CLEANUP_THREADING)
{
threaded_edge = thread_jump (mode, e, target);
if (threaded_edge)
edge t = thread_jump (mode, e, target);
if (t)
{
new_target = threaded_edge->dest;
new_target = t->dest;
new_target_threaded = true;
if (!nthreaded_edges)
threaded_edges = xmalloc (sizeof (*threaded_edges)
* n_basic_blocks);
threaded_edges[nthreaded_edges++] = t;
}
}
@ -462,6 +467,7 @@ try_forward_edges (mode, b)
gcov_type edge_count = e->count;
int edge_probability = e->probability;
int edge_frequency;
int n = 0;
/* Don't force if target is exit block. */
if (threaded && target != EXIT_BLOCK_PTR)
@ -498,7 +504,7 @@ try_forward_edges (mode, b)
first->succ->count -= edge_count;
first->frequency -= edge_frequency;
if (first->succ->succ_next)
t = threaded_edge;
t = threaded_edges [n++];
else
t = first->succ;
@ -510,6 +516,8 @@ try_forward_edges (mode, b)
}
}
if (threaded_edges)
free (threaded_edges);
return changed;
}