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tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.

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* tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.

	* passes.c (init_optimization_passes): Remove superfluous
	copy-prop pass.

From-SVN: r167184
This commit is contained in:
Michael Matz 2010-11-26 16:51:39 +00:00 committed by Michael Matz
parent 67701d1ddc
commit f7882debb8
3 changed files with 10 additions and 2 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2010-11-26 Michael Matz <matz@suse.de>
* tree-ssa-copy.c (fini_copy_prop): Don't DCE when we have loops.
* passes.c (init_optimization_passes): Remove superfluous
copy-prop pass.
2010-11-26 Richard Guenther <rguenther@suse.de>
PR lto/46648

1
gcc/passes.c
View File

@ -897,7 +897,6 @@ init_optimization_passes (void)
NEXT_PASS (pass_graphite);
{
struct opt_pass **p = &pass_graphite.pass.sub;
NEXT_PASS (pass_copy_prop);
NEXT_PASS (pass_graphite_transforms);
NEXT_PASS (pass_copy_prop);
NEXT_PASS (pass_dce_loop);

4
gcc/tree-ssa-copy.c
View File

@ -775,7 +775,9 @@ fini_copy_prop (void)
duplicate_ssa_name_ptr_info (copy_of[i].value, SSA_NAME_PTR_INFO (var));
}
substitute_and_fold (get_value, NULL, true);
/* Don't do DCE if we have loops. That's the simplest way to not
destroy the scev cache. */
substitute_and_fold (get_value, NULL, !current_loops);
free (copy_of);
}