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(struct temp_slot): New fields base_offset, full_size. 

(assign_stack_temp): For !FRAME_GROWS_DOWNWARD, set p->size to size.
Set new fields base_offset and full_size.
(combine_temp_slots): Use new fields base_offset and full_size instead
of slot and size.

From-SVN: r10136
This commit is contained in:
Richard Kenner 1995-07-14 19:15:58 -04:00
parent ef0e171b50
commit fc91b0d0aa
1 changed files with 21 additions and 7 deletions
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28
gcc/function.c
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@ -367,6 +367,12 @@ struct temp_slot
int level;
/* Non-zero if this should survive a call to free_temp_slots. */
int keep;
/* The offset of the slot from the frame_pointer, including extra space
for alignment. This info is for combine_temp_slots. */
int base_offset;
/* The size of the slot, including extra space for alignment. This
info is for combine_temp_slots. */
int full_size;
};
/* List of all temporaries allocated, both available and in use. */
@ -870,12 +876,22 @@ assign_stack_temp (mode, size, keep)
/* The following slot size computation is necessary because we don't
know the actual size of the temporary slot until assign_stack_local
has performed all the frame alignment and size rounding for the
requested temporary. Otherwise combine_temp_slots won't think that
adjacent slots really are adjacent. */
requested temporary. Note that extra space added for alignment
can be either above or below this stack slot depending on which
way the frame grows. We include the extra space if and only if it
is above this slot. */
#ifdef FRAME_GROWS_DOWNWARD
p->size = frame_offset_old - frame_offset;
#else
p->size = frame_offset - frame_offset_old;
p->size = size;
#endif
/* Now define the fields used by combine_temp_slots. */
#ifdef FRAME_GROWS_DOWNWARD
p->base_offset = frame_offset;
p->full_size = frame_offset_old - frame_offset;
#else
p->base_offset = frame_offset_old;
p->full_size = frame_offset - frame_offset_old;
#endif
p->address = 0;
p->next = temp_slots;
@ -922,15 +938,13 @@ combine_temp_slots ()
int delete_q = 0;
if (! q->in_use && GET_MODE (q->slot) == BLKmode)
{
if (rtx_equal_p (plus_constant (XEXP (p->slot, 0), p->size),
XEXP (q->slot, 0)))
if (p->base_offset + p->full_size == q->base_offset)
{
/* Q comes after P; combine Q into P. */
p->size += q->size;
delete_q = 1;
}
else if (rtx_equal_p (plus_constant (XEXP (q->slot, 0), q->size),
XEXP (p->slot, 0)))
else if (q->base_offset + q->full_size == p->base_offset)
{
/* P comes after Q; combine P into Q. */
q->size += p->size;