Any required stack pointer alignment is preserved.
SIZE is an rtx representing the size of the area.
- TARGET is a place in which the address can be placed. */
+ TARGET is a place in which the address can be placed.
+
+ KNOWN_ALIGN is the alignment (in bits) that we know SIZE has. */
rtx
-allocate_dynamic_stack_space (size, target)
+allocate_dynamic_stack_space (size, target, known_align)
rtx size;
rtx target;
+ int known_align;
{
/* Ensure the size is in the proper mode. */
if (GET_MODE (size) != VOIDmode && GET_MODE (size) != Pmode)
way of knowing which systems have this problem. So we avoid even
momentarily mis-aligning the stack. */
- size = round_push (size);
+ if (known_align % STACK_BOUNDARY != 0)
+ size = round_push (size);
do_pending_stack_adjust ();
- if (target == 0)
+ /* Don't use a TARGET that isn't a pseudo. */
+ if (target == 0 || GET_CODE (target) != REG
+ || REGNO (target) < FIRST_PSEUDO_REGISTER)
target = gen_reg_rtx (Pmode);
#ifndef STACK_GROWS_DOWNWARD
#endif
#ifdef MUST_ALIGN
- target = expand_divmod (0, CEIL_DIV_EXPR, Pmode, target,
- gen_rtx (CONST_INT, VOIDmode,
- BIGGEST_ALIGNMENT / BITS_PER_UNIT),
- 0, 1);
-
- target = expand_mult (Pmode, target,
- gen_rtx (CONST_INT, VOIDmode,
- BIGGEST_ALIGNMENT / BITS_PER_UNIT),
- 0, 1);
+ if (known_align % BIGGEST_ALIGNMENT != 0)
+ {
+ target = expand_divmod (0, CEIL_DIV_EXPR, Pmode, target,
+ gen_rtx (CONST_INT, VOIDmode,
+ BIGGEST_ALIGNMENT / BITS_PER_UNIT),
+ 0, 1);
+
+ target = expand_mult (Pmode, target,
+ gen_rtx (CONST_INT, VOIDmode,
+ BIGGEST_ALIGNMENT / BITS_PER_UNIT),
+ 0, 1);
+ }
#endif
/* Some systems require a particular insn to refer to the stack