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tree-sra.c (sra_walk_expr): Disable scalarization if on the LHS and not a full access.

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* tree-sra.c (sra_walk_expr) <VIEW_CONVERT_EXPR>: Disable
	scalarization if on the LHS and not a full access.

From-SVN: r134487
This commit is contained in:
Eric Botcazou 2008-04-20 17:53:58 +00:00
parent e871a8730a
commit eea05d39c7
2 changed files with 23 additions and 8 deletions
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9
gcc/ChangeLog
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@ -1,9 +1,14 @@
2008-04-20 Eric Botcazou <ebotcazou@adacore.com>
* tree-sra.c (sra_walk_expr) <VIEW_CONVERT_EXPR>: Disable
scalarization if on the LHS and not a full access.
2008-04-20 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
* Makefile.in (s-gtyp-input): Remove tmp-gi.list before writing
it.
* Makefile.in (s-gtyp-input): Remove tmp-gi.list before writing it.
2008-04-18 Rafael Espindola <espindola@google.com>
* tree-vrp.c (find_case_label_index): Fix the binary search.
(find_case_label_range): New.
(vrp_visit_switch_stmt): Use find_case_label_range.

22
gcc/tree-sra.c
View File

@ -855,16 +855,26 @@ sra_walk_expr (tree *expr_p, block_stmt_iterator *bsi, bool is_output,
if (elt)
elt->is_vector_lhs = true;
}
/* A bit field reference (access to *multiple* fields simultaneously)
is not currently scalarized. Consider this an access to the
complete outer element, to which walk_tree will bring us next. */
is not currently scalarized. Consider this an access to the full
outer element, to which walk_tree will bring us next. */
goto use_all;
case NOP_EXPR:
/* Similarly, a nop explicitly wants to look at an object in a
type other than the one we've scalarized. */
goto use_all;
case VIEW_CONVERT_EXPR:
case NOP_EXPR:
/* Similarly, a view/nop explicitly wants to look at an object in a
type other than the one we've scalarized. */
/* Likewise for a view conversion, but with an additional twist:
it can be on the LHS and, in this case, an access to the full
outer element would mean a killing def. So we need to punt
if we haven't already a full access to the current element,
because we cannot pretend to have a killing def if we only
have a partial access at some level. */
if (is_output && !use_all_p && inner != expr)
disable_scalarization = true;
goto use_all;
case WITH_SIZE_EXPR: