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expr.c (clear_storage): Don't use emit_move_insn unless either BLKmode or proper size.

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* expr.c (clear_storage): Don't use emit_move_insn unless
	either BLKmode or proper size.
	(store_constructor): Don't call clear_storage if REG of wrong size.

From-SVN: r36101
This commit is contained in:
Richard Kenner 2000-09-01 15:10:52 +00:00 committed by Richard Kenner
parent ad17a40dce
commit fcf1b822b4
2 changed files with 17 additions and 5 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
Fri Sep 1 10:59:47 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* expr.c (clear_storage): Don't use emit_move_insn unless
either BLKmode or proper size.
(store_constructor): Don't call clear_storage if REG of wrong size.
* flow.c (init_propagate_block_info): Don't mark frame dead at end
of function if returns wiht stack pointer depressed.

18
gcc/expr.c
View File

@ -2392,7 +2392,13 @@ clear_storage (object, size, align)
#endif
rtx retval = 0;
if (GET_MODE (object) == BLKmode)
/* If OBJECT is not BLKmode and SIZE is the same size as its mode,
just move a zero. Otherwise, do this a piece at a time. */
if (GET_MODE (object) != BLKmode
&& GET_CODE (size) == CONST_INT
&& GET_MODE_SIZE (GET_MODE (object)) == INTVAL (size))
emit_move_insn (object, CONST0_RTX (GET_MODE (object)));
else
{
object = protect_from_queue (object, 1);
size = protect_from_queue (size, 0);
@ -2544,8 +2550,6 @@ clear_storage (object, size, align)
#endif
}
}
else
emit_move_insn (object, CONST0_RTX (GET_MODE (object)));
return retval;
}
@ -4263,11 +4267,15 @@ store_constructor (exp, target, align, cleared, size)
/* If the constructor has fewer fields than the structure
or if we are initializing the structure to mostly zeros,
clear the whole structure first. */
clear the whole structure first. Don't do this is TARGET is
register whose mode size isn't equal to SIZE since clear_storage
can't handle this case. */
else if (size > 0
&& ((list_length (CONSTRUCTOR_ELTS (exp))
!= fields_length (type))
|| mostly_zeros_p (exp)))
|| mostly_zeros_p (exp))
&& (GET_CODE (target) != REG
|| GET_MODE_SIZE (GET_MODE (target)) == size))
{
if (! cleared)
clear_storage (target, GEN_INT (size), align);