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reload1.c (struct elim_table): Delete MAX_OFFSET member. 

�
	* reload1.c (struct elim_table): Delete MAX_OFFSET member.
	(update_eliminable_offsets): Don't compute it.
	(set_initial_elim_offsets): Don't initialize it.
	Break out some code into set_initial_label_offsets so the rest of
	this function can be called from reload_as_needed.
	Assume that INITIAL_FRAME_POINTER_OFFSET is defeined when
	ELIMINABLE_REGS isn't.
	(set_initial_label_offsets): New function, broken out of
	set_initial_elim_offsets.
	(set_offsets_for_label): New function, broken out of set_label_offsets
	and reload_as_needed.
	(reload): Call the two new functions.
	(reload_as_needed): Call set_initial_elim_offsets instead of
	duplicating the code.  Likewise for set_offsets_for_label.

From-SVN: r23442
This commit is contained in:
Jeff Law 1998-10-29 16:07:56 -07:00
parent 6467c05f00
commit 1f3b1e1a0b
1 changed files with 42 additions and 68 deletions
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110
gcc/reload1.c
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@ -299,7 +299,6 @@ static struct elim_table
int can_eliminate_previous; /* Value of CAN_ELIMINATE in previous scan over
insns made by reload. */
int offset; /* Current offset between the two regs. */
int max_offset; /* Maximum offset between the two regs. */
int previous_offset; /* Offset at end of previous insn. */
int ref_outside_mem; /* "to" has been referenced outside a MEM. */
rtx from_rtx; /* REG rtx for the register to be eliminated.
@ -378,6 +377,8 @@ static void update_eliminable_offsets PROTO((void));
static void mark_not_eliminable PROTO((rtx, rtx));
static void set_initial_elim_offsets PROTO((void));
static void verify_initial_elim_offsets PROTO((void));
static void set_initial_label_offsets PROTO((void));
static void set_offsets_for_label PROTO((rtx));
static void init_elim_table PROTO((void));
static void update_eliminables PROTO((HARD_REG_SET *));
static void spill_hard_reg PROTO((int, FILE *, int));
@ -824,6 +825,7 @@ reload (first, global, dumpfile)
starting_frame_size = get_frame_size ();
set_initial_elim_offsets ();
set_initial_label_offsets ();
/* For each pseudo register that has an equivalent location defined,
try to eliminate any eliminable registers (such as the frame pointer)
@ -2449,19 +2451,7 @@ set_label_offsets (x, insn, initial_p)
else if (x == insn
&& (tem = prev_nonnote_insn (insn)) != 0
&& GET_CODE (tem) == BARRIER)
{
num_not_at_initial_offset = 0;
for (i = 0; i < NUM_ELIMINABLE_REGS; i++)
{
reg_eliminate[i].offset = reg_eliminate[i].previous_offset
= offsets_at[CODE_LABEL_NUMBER (x)][i];
if (reg_eliminate[i].can_eliminate
&& (reg_eliminate[i].offset
!= reg_eliminate[i].initial_offset))
num_not_at_initial_offset++;
}
}
set_offsets_for_label (insn);
else
/* If neither of the above cases is true, compare each offset
with those previously recorded and suppress any eliminations
@ -3381,12 +3371,6 @@ update_eliminable_offsets ()
ep->previous_offset = ep->offset;
if (ep->can_eliminate && ep->offset != ep->initial_offset)
num_not_at_initial_offset++;
#ifdef STACK_GROWS_DOWNWARD
ep->max_offset = MAX (ep->max_offset, ep->offset);
#else
ep->max_offset = MIN (ep->max_offset, ep->offset);
#endif
}
}
@ -3462,43 +3446,59 @@ verify_initial_elim_offsets ()
static void
set_initial_elim_offsets ()
{
rtx x;
struct elim_table *ep = reg_eliminate;
#ifdef ELIMINABLE_REGS
struct elim_table *ep;
for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
for (; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
{
INITIAL_ELIMINATION_OFFSET (ep->from, ep->to, ep->initial_offset);
ep->previous_offset = ep->offset
= ep->max_offset = ep->initial_offset;
ep->previous_offset = ep->offset = ep->initial_offset;
}
#else
#ifdef INITIAL_FRAME_POINTER_OFFSET
INITIAL_FRAME_POINTER_OFFSET (reg_eliminate[0].initial_offset);
#else
if (!FRAME_POINTER_REQUIRED)
abort ();
reg_eliminate[0].initial_offset = 0;
#endif
reg_eliminate[0].previous_offset = reg_eliminate[0].max_offset
= reg_eliminate[0].offset = reg_eliminate[0].initial_offset;
INITIAL_FRAME_POINTER_OFFSET (ep->initial_offset);
ep->previous_offset = ep->offset = ep->initial_offset;
#endif
num_not_at_initial_offset = 0;
}
/* Initialize the known label offsets.
Set a known offset for each forced label to be at the initial offset
of each elimination. We do this because we assume that all
computed jumps occur from a location where each elimination is
at its initial offset.
For all other labels, show that we don't know the offsets. */
static void
set_initial_label_offsets ()
{
rtx x;
bzero ((char *) &offsets_known_at[get_first_label_num ()], num_labels);
/* Set a known offset for each forced label to be at the initial offset
of each elimination. We do this because we assume that all
computed jumps occur from a location where each elimination is
at its initial offset. */
for (x = forced_labels; x; x = XEXP (x, 1))
if (XEXP (x, 0))
set_label_offsets (XEXP (x, 0), NULL_RTX, 1);
}
/* Set all elimination offsets to the known values for the code label given
by INSN. */
static void
set_offsets_for_label (insn)
rtx insn;
{
int i;
int label_nr = CODE_LABEL_NUMBER (insn);
struct elim_table *ep;
num_not_at_initial_offset = 0;
for (i = 0, ep = reg_eliminate; i < NUM_ELIMINABLE_REGS; ep++, i++)
{
ep->offset = ep->previous_offset = offsets_at[label_nr][i];
if (ep->can_eliminate && ep->offset != ep->initial_offset)
num_not_at_initial_offset++;
}
}
/* See if anything that happened changes which eliminations are valid.
For example, on the Sparc, whether or not the frame pointer can
be eliminated can depend on what registers have been used. We need
@ -4056,22 +4056,7 @@ reload_as_needed (live_known)
reg_has_output_reload = (char *) alloca (max_regno);
CLEAR_HARD_REG_SET (reg_reloaded_valid);
/* Reset all offsets on eliminable registers to their initial values. */
#ifdef ELIMINABLE_REGS
for (i = 0; i < (int) NUM_ELIMINABLE_REGS; i++)
{
INITIAL_ELIMINATION_OFFSET (reg_eliminate[i].from, reg_eliminate[i].to,
reg_eliminate[i].initial_offset);
reg_eliminate[i].previous_offset
= reg_eliminate[i].offset = reg_eliminate[i].initial_offset;
}
#else
INITIAL_FRAME_POINTER_OFFSET (reg_eliminate[0].initial_offset);
reg_eliminate[0].previous_offset
= reg_eliminate[0].offset = reg_eliminate[0].initial_offset;
#endif
num_not_at_initial_offset = 0;
set_initial_elim_offsets ();
for (chain = reload_insn_chain; chain; chain = chain->next)
{
@ -4082,18 +4067,7 @@ reload_as_needed (live_known)
/* If we pass a label, copy the offsets from the label information
into the current offsets of each elimination. */
if (GET_CODE (insn) == CODE_LABEL)
{
num_not_at_initial_offset = 0;
for (i = 0; i < (int) NUM_ELIMINABLE_REGS; i++)
{
reg_eliminate[i].offset = reg_eliminate[i].previous_offset
= offsets_at[CODE_LABEL_NUMBER (insn)][i];
if (reg_eliminate[i].can_eliminate
&& (reg_eliminate[i].offset
!= reg_eliminate[i].initial_offset))
num_not_at_initial_offset++;
}
}
set_offsets_for_label (insn);
else if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
{