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re PR tree-optimization/51117 (rev.181172 causes glibc build failure) 

PR tree-optimization/51117
	* tree-eh.c (optimize_clobbers): New function.
	(execute_lower_eh_dispatch): Call it.

Co-Authored-By: Andrew Pinski <apinski@cavium.com>

From-SVN: r182158
This commit is contained in:
Jakub Jelinek 2011-12-09 12:48:30 +01:00 committed by Jakub Jelinek
parent 48f2e37342
commit 960f0c9d4c
2 changed files with 37 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-12-09 Jakub Jelinek <jakub@redhat.com>
Andrew Pinski <apinski@cavium.com>
PR tree-optimization/51117
* tree-eh.c (optimize_clobbers): New function.
(execute_lower_eh_dispatch): Call it.
2011-12-09 Richard Guenther <rguenther@suse.de>
PR tree-optimization/51482

31
gcc/tree-eh.c
View File

@ -3173,6 +3173,30 @@ struct gimple_opt_pass pass_lower_resx =
}
};
/* Try to optimize var = {v} {CLOBBER} stmts followed just by
external throw. */
static void
optimize_clobbers (basic_block bb)
{
gimple_stmt_iterator gsi = gsi_last_bb (bb);
for (gsi_prev (&gsi); !gsi_end_p (gsi);)
{
gimple stmt = gsi_stmt (gsi);
if (is_gimple_debug (stmt))
{
gsi_prev (&gsi);
continue;
}
if (!gimple_assign_single_p (stmt)
|| TREE_CODE (gimple_assign_lhs (stmt)) == SSA_NAME
|| !TREE_CLOBBER_P (gimple_assign_rhs1 (stmt)))
return;
unlink_stmt_vdef (stmt);
gsi_remove (&gsi, true);
release_defs (stmt);
}
}
/* At the end of inlining, we can lower EH_DISPATCH. Return true when
we have found some duplicate labels and removed some edges. */
@ -3337,11 +3361,16 @@ execute_lower_eh_dispatch (void)
FOR_EACH_BB (bb)
{
gimple last = last_stmt (bb);
if (last && gimple_code (last) == GIMPLE_EH_DISPATCH)
if (last == NULL)
continue;
if (gimple_code (last) == GIMPLE_EH_DISPATCH)
{
redirected |= lower_eh_dispatch (bb, last);
any_rewritten = true;
}
else if (gimple_code (last) == GIMPLE_RESX
&& stmt_can_throw_external (last))
optimize_clobbers (bb);
}
if (redirected)