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tree-ssa-coalesce.c (gimple_can_coalesce_p): In the optimized case, allow coalescing if the types are compatible.

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* tree-ssa-coalesce.c (gimple_can_coalesce_p): In the optimized case,
	allow coalescing if the types are compatible.

From-SVN: r235980
This commit is contained in:
Eric Botcazou 2016-05-06 15:54:15 +00:00 committed by Eric Botcazou
parent ccd88fb795
commit 0e19f3b334
2 changed files with 21 additions and 9 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-05-06 Eric Botcazou <ebotcazou@adacore.com>
* tree-ssa-coalesce.c (gimple_can_coalesce_p): In the optimized case,
allow coalescing if the types are compatible.
2016-05-06 David Malcolm <dmalcolm@redhat.com>
* pass_manager.h (pass_manager::register_pass_name): New method.

25
gcc/tree-ssa-coalesce.c
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@ -1569,17 +1569,24 @@ gimple_can_coalesce_p (tree name1, tree name2)
var2 ? LOCAL_DECL_ALIGNMENT (var2) : TYPE_ALIGN (t2)))
return false;
/* If the types are not the same, check for a canonical type match. This
/* If the types are not the same, see whether they are compatible. This
(for example) allows coalescing when the types are fundamentally the
same, but just have different names.
same, but just have different names.
Note pointer types with different address spaces may have the same
canonical type. Those are rejected for coalescing by the
types_compatible_p check. */
if (TYPE_CANONICAL (t1)
&& TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
&& types_compatible_p (t1, t2))
goto check_modes;
In the non-optimized case, we must first test TYPE_CANONICAL because
we use it to compute the partition_to_base_index of the map. */
if (flag_tree_coalesce_vars)
{
if (types_compatible_p (t1, t2))
goto check_modes;
}
else
{
if (TYPE_CANONICAL (t1)
&& TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
&& types_compatible_p (t1, t2))
goto check_modes;
}
return false;
}