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stor-layout.c (variable_size): Leave a minus 1 outside the SAVE_EXPR.

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* stor-layout.c (variable_size): Leave a minus 1 outside the
        SAVE_EXPR.

From-SVN: r63585
This commit is contained in:
Jason Merrill 2003-02-28 17:53:50 -05:00 committed by Jason Merrill
parent 0ea05c0da3
commit 3695c25fd6
2 changed files with 17 additions and 8 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2003-02-28 Jason Merrill <jason@redhat.com>
* stor-layout.c (variable_size): Leave a "minus 1" outside the
SAVE_EXPR.
2003-02-28 David Edelsohn <edelsohn@gnu.org>
* config/rs6000/power4.md: Add compare bypass.

20
gcc/stor-layout.c
View File

@ -157,6 +157,8 @@ tree
variable_size (size)
tree size;
{
tree save;
/* If the language-processor is to take responsibility for variable-sized
items (e.g., languages which have elaboration procedures like Ada),
just return SIZE unchanged. Likewise for self-referential sizes and
@ -166,7 +168,12 @@ variable_size (size)
|| contains_placeholder_p (size))
return size;
size = save_expr (size);
if (TREE_CODE (size) == MINUS_EXPR && integer_onep (TREE_OPERAND (size, 1)))
/* If this is the upper bound of a C array, leave the minus 1 outside
the SAVE_EXPR so it can be folded away. */
TREE_OPERAND (size, 0) = save = save_expr (TREE_OPERAND (size, 0));
else
size = save = save_expr (size);
/* If an array with a variable number of elements is declared, and
the elements require destruction, we will emit a cleanup for the
@ -176,8 +183,8 @@ variable_size (size)
`unsaved', i.e., all SAVE_EXPRs are recalculated. However, we do
not wish to do that here; the array-size is the same in both
places. */
if (TREE_CODE (size) == SAVE_EXPR)
SAVE_EXPR_PERSISTENT_P (size) = 1;
if (TREE_CODE (save) == SAVE_EXPR)
SAVE_EXPR_PERSISTENT_P (save) = 1;
if ((*lang_hooks.decls.global_bindings_p) ())
{
@ -190,16 +197,13 @@ variable_size (size)
}
if (immediate_size_expand)
/* NULL_RTX is not defined; neither is the rtx type.
Also, we would like to pass const0_rtx here, but don't have it. */
expand_expr (size, expand_expr (integer_zero_node, NULL_RTX, VOIDmode, 0),
VOIDmode, 0);
expand_expr (save, const0_rtx, VOIDmode, 0);
else if (cfun != 0 && cfun->x_dont_save_pending_sizes_p)
/* The front-end doesn't want us to keep a list of the expressions
that determine sizes for variable size objects. */
;
else
put_pending_size (size);
put_pending_size (save);
return size;
}