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(reload): Can't eliminate if frame pointer needed and TO is stack pointer.

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Spill HARD_FRAME_POINTER_REGNUM if not FRAME_POINTER_REGNUM and frame pointer
is needed.
(spill_hard_reg): If CANT_ELIMINATE, set regs_ever_live; no longer done by
callers.

From-SVN: r7605
This commit is contained in:
Richard Kenner 1994-06-29 16:02:13 -04:00
parent daf55ac69a
commit 9ff3516a35
1 changed files with 21 additions and 7 deletions
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28
gcc/reload1.c
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@ -614,8 +614,7 @@ reload (first, global, dumpfile)
{
ep->can_eliminate = ep->can_eliminate_previous
= (CAN_ELIMINATE (ep->from, ep->to)
&& (ep->from != HARD_FRAME_POINTER_REGNUM
|| ! frame_pointer_needed));
&& ! (ep->to == STACK_POINTER_REGNUM && frame_pointer_needed));
}
#else
reg_eliminate[0].can_eliminate = reg_eliminate[0].can_eliminate_previous
@ -703,10 +702,12 @@ reload (first, global, dumpfile)
/* Spill any hard regs that we know we can't eliminate. */
for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
if (! ep->can_eliminate)
{
spill_hard_reg (ep->from, global, dumpfile, 1);
regs_ever_live[ep->from] = 1;
}
spill_hard_reg (ep->from, global, dumpfile, 1);
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
if (frame_pointer_needed)
spill_hard_reg (HARD_FRAME_POINTER_REGNUM, global, dumpfile, 1);
#endif
if (global)
for (i = 0; i < N_REG_CLASSES; i++)
@ -760,6 +761,7 @@ reload (first, global, dumpfile)
rtx max_nongroups_insn[N_REG_CLASSES];
rtx x;
int starting_frame_size = get_frame_size ();
int previous_frame_pointer_needed = frame_pointer_needed;
static char *reg_class_names[] = REG_CLASS_NAMES;
something_changed = 0;
@ -1504,12 +1506,21 @@ reload (first, global, dumpfile)
{
ep->can_eliminate_previous = 0;
spill_hard_reg (ep->from, global, dumpfile, 1);
regs_ever_live[ep->from] = 1;
something_changed = 1;
num_eliminable--;
}
}
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
/* If we didn't need a frame pointer last time, but we do now, spill
the hard frame pointer. */
if (frame_pointer_needed && ! previous_frame_pointer_needed)
{
spill_hard_reg (HARD_FRAME_POINTER_REGNUM, global, dumpfile, 1);
something_changed = 1;
}
#endif
/* If all needs are met, we win. */
for (i = 0; i < N_REG_CLASSES; i++)
@ -3355,6 +3366,9 @@ spill_hard_reg (regno, global, dumpfile, cant_eliminate)
SET_HARD_REG_BIT (forbidden_regs, regno);
if (cant_eliminate)
regs_ever_live[regno] = 1;
/* Spill every pseudo reg that was allocated to this reg
or to something that overlaps this reg. */