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tree-ssa-copy.c (stmt_may_generate_copy): Copies from constants also generate copies. 

2011-03-25  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copy.c (stmt_may_generate_copy): Copies from constants
	also generate copies.
	(fini_copy_prop): Handle constant values properly.

From-SVN: r171465
This commit is contained in:
Richard Guenther 2011-03-25 16:28:15 +00:00 committed by Richard Biener
parent 21385db052
commit fdc2de95e9
2 changed files with 10 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-03-25 Richard Guenther <rguenther@suse.de>
* tree-ssa-copy.c (stmt_may_generate_copy): Copies from constants
also generate copies.
(fini_copy_prop): Handle constant values properly.
2011-03-25 Jakub Jelinek <jakub@redhat.com> 2011-03-25 Jakub Jelinek <jakub@redhat.com>
* dwarf2out.c (mem_loc_descriptor) <case ZERO_EXTRACT>: Compare * dwarf2out.c (mem_loc_descriptor) <case ZERO_EXTRACT>: Compare

6
gcc/tree-ssa-copy.c
View File

@ -315,8 +315,9 @@ stmt_may_generate_copy (gimple stmt)
/* Otherwise, the only statements that generate useful copies are /* Otherwise, the only statements that generate useful copies are
assignments whose RHS is just an SSA name that doesn't flow assignments whose RHS is just an SSA name that doesn't flow
through abnormal edges. */ through abnormal edges. */
return (gimple_assign_rhs_code (stmt) == SSA_NAME return ((gimple_assign_rhs_code (stmt) == SSA_NAME
&& !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs1 (stmt))); && !SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs1 (stmt)))
|| is_gimple_min_invariant (gimple_assign_rhs1 (stmt)));
} }
@ -771,6 +772,7 @@ fini_copy_prop (void)
of the representative to the first solution we find if of the representative to the first solution we find if
it doesn't have one already. */ it doesn't have one already. */
if (copy_of[i].value != var if (copy_of[i].value != var
&& TREE_CODE (copy_of[i].value) == SSA_NAME
&& POINTER_TYPE_P (TREE_TYPE (var)) && POINTER_TYPE_P (TREE_TYPE (var))
&& SSA_NAME_PTR_INFO (var) && SSA_NAME_PTR_INFO (var)
&& !SSA_NAME_PTR_INFO (copy_of[i].value)) && !SSA_NAME_PTR_INFO (copy_of[i].value))