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tree-nested.c (save_tmp_var): New.

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* tree-nested.c (save_tmp_var): New.
        (struct walk_stmt_info): Add is_lhs.
        (walk_stmts) <MODIFY_EXPR>: Be more accurate with setting of
        val_only; set is_lhs.
        (convert_nonlocal_reference): Use save_tmp_var when is_lhs;
        clear is_lhs when appropriate.
        (convert_local_reference): Likewise.

From-SVN: r92357
This commit is contained in:
Richard Henderson 2004-12-18 10:59:04 -08:00 committed by Richard Henderson
parent 8cd0dbef04
commit c529c27ef5
2 changed files with 62 additions and 8 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2004-12-18 Richard Henderson <rth@redhat.com>
* tree-nested.c (save_tmp_var): New.
(struct walk_stmt_info): Add is_lhs.
(walk_stmts) <MODIFY_EXPR>: Be more accurate with setting of
val_only; set is_lhs.
(convert_nonlocal_reference): Use save_tmp_var when is_lhs;
clear is_lhs when appropriate.
(convert_local_reference): Likewise.
2004-12-18 Richard Earnshaw <rearnsha@arm.com>
* arm/ieee754-sf.S (floatdisf): Fix label definition in FPA

60
gcc/tree-nested.c
View File

@ -376,6 +376,23 @@ tsi_gimplify_val (struct nesting_info *info, tree exp, tree_stmt_iterator *tsi)
return init_tmp_var (info, exp, tsi);
}
/* Similarly, but copy from the temporary and insert the statement
after the iterator. */
static tree
save_tmp_var (struct nesting_info *info, tree exp,
tree_stmt_iterator *tsi)
{
tree t, stmt;
t = create_tmp_var_for (info, TREE_TYPE (exp), NULL);
stmt = build (MODIFY_EXPR, TREE_TYPE (t), exp, t);
SET_EXPR_LOCUS (stmt, EXPR_LOCUS (tsi_stmt (*tsi)));
tsi_link_after (tsi, stmt, TSI_SAME_STMT);
return t;
}
/* Build or return the type used to represent a nested function trampoline. */
static GTY(()) tree trampoline_type;
@ -517,6 +534,7 @@ struct walk_stmt_info
tree_stmt_iterator tsi;
struct nesting_info *info;
bool val_only;
bool is_lhs;
bool changed;
};
@ -567,12 +585,18 @@ walk_stmts (struct walk_stmt_info *wi, tree *tp)
break;
case MODIFY_EXPR:
/* The immediate arguments of a MODIFY_EXPR may use COMPONENT_REF. */
wi->val_only = false;
walk_tree (&TREE_OPERAND (t, 0), wi->callback, wi, NULL);
wi->val_only = false;
/* A formal temporary lhs may use a COMPONENT_REF rhs. */
wi->val_only = !is_gimple_formal_tmp_var (TREE_OPERAND (t, 0));
walk_tree (&TREE_OPERAND (t, 1), wi->callback, wi, NULL);
/* If the rhs is appropriate for a memory, we may use a
COMPONENT_REF on the lhs. */
wi->val_only = !is_gimple_mem_rhs (TREE_OPERAND (t, 1));
wi->is_lhs = true;
walk_tree (&TREE_OPERAND (t, 0), wi->callback, wi, NULL);
wi->val_only = true;
wi->is_lhs = false;
break;
default:
@ -789,8 +813,14 @@ convert_nonlocal_reference (tree *tp, int *walk_subtrees, void *data)
x = init_tmp_var (info, x, &wi->tsi);
x = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (x)), x);
}
if (wi->val_only)
x = init_tmp_var (info, x, &wi->tsi);
{
if (wi->is_lhs)
x = save_tmp_var (info, x, &wi->tsi);
else
x = init_tmp_var (info, x, &wi->tsi);
}
*tp = x;
}
@ -802,6 +832,7 @@ convert_nonlocal_reference (tree *tp, int *walk_subtrees, void *data)
{
*walk_subtrees = 1;
wi->val_only = true;
wi->is_lhs = false;
}
break;
@ -818,8 +849,9 @@ convert_nonlocal_reference (tree *tp, int *walk_subtrees, void *data)
{
bool save_val_only = wi->val_only;
wi->changed = false;
wi->val_only = false;
wi->is_lhs = false;
wi->changed = false;
walk_tree (&TREE_OPERAND (t, 0), convert_nonlocal_reference, wi, NULL);
wi->val_only = true;
@ -848,6 +880,7 @@ convert_nonlocal_reference (tree *tp, int *walk_subtrees, void *data)
anything that describes the references. Otherwise, we lose track
of whether a NOP_EXPR or VIEW_CONVERT_EXPR needs a simple value. */
wi->val_only = true;
wi->is_lhs = false;
for (; handled_component_p (t); tp = &TREE_OPERAND (t, 0), t = *tp)
{
if (TREE_CODE (t) == COMPONENT_REF)
@ -880,6 +913,7 @@ convert_nonlocal_reference (tree *tp, int *walk_subtrees, void *data)
{
*walk_subtrees = 1;
wi->val_only = true;
wi->is_lhs = false;
}
break;
}
@ -922,8 +956,15 @@ convert_local_reference (tree *tp, int *walk_subtrees, void *data)
wi->changed = true;
x = get_frame_field (info, info->context, field, &wi->tsi);
if (wi->val_only)
x = init_tmp_var (info, x, &wi->tsi);
{
if (wi->is_lhs)
x = save_tmp_var (info, x, &wi->tsi);
else
x = init_tmp_var (info, x, &wi->tsi);
}
*tp = x;
}
break;
@ -932,8 +973,9 @@ convert_local_reference (tree *tp, int *walk_subtrees, void *data)
{
bool save_val_only = wi->val_only;
wi->changed = false;
wi->val_only = false;
wi->is_lhs = false;
wi->changed = false;
walk_tree (&TREE_OPERAND (t, 0), convert_local_reference, wi, NULL);
wi->val_only = save_val_only;
@ -963,6 +1005,7 @@ convert_local_reference (tree *tp, int *walk_subtrees, void *data)
anything that describes the references. Otherwise, we lose track
of whether a NOP_EXPR or VIEW_CONVERT_EXPR needs a simple value. */
wi->val_only = true;
wi->is_lhs = false;
for (; handled_component_p (t); tp = &TREE_OPERAND (t, 0), t = *tp)
{
if (TREE_CODE (t) == COMPONENT_REF)
@ -995,6 +1038,7 @@ convert_local_reference (tree *tp, int *walk_subtrees, void *data)
{
*walk_subtrees = 1;
wi->val_only = true;
wi->is_lhs = false;
}
break;
}