/* Look for REG_EQUIV notes; record what each pseudo is equivalent to.
Also find all paradoxical subregs and find largest such for each pseudo.
On machines with small register classes, record hard registers that
- are used for user variables. These can never be used for spills. */
+ are used for user variables. These can never be used for spills.
+ Also look for a "constant" NOTE_INSN_SETJMP. This means that all
+ caller-saved registers must be marked live. */
for (insn = first; insn; insn = NEXT_INSN (insn))
{
rtx set = single_set (insn);
+ if (GET_CODE (insn) == NOTE && CONST_CALL_P (insn)
+ && NOTE_LINE_NUMBER (insn) == NOTE_INSN_SETJMP)
+ for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
+ if (! call_used_regs[i])
+ regs_ever_live[i] = 1;
+
if (set != 0 && GET_CODE (SET_DEST (set)) == REG)
{
rtx note = find_reg_note (insn, REG_EQUIV, NULL_RTX);
/* I is nonneg if this reload used one of the spill regs.
If reload_reg_rtx[r] is 0, this is an optional reload
- that we opted to ignore.
-
- Also ignore reloads that don't reach the end of the insn,
- since we will eventually see the one that does. */
+ that we opted to ignore. */
- if (i >= 0 && reload_reg_rtx[r] != 0
- && reload_reg_reaches_end_p (spill_regs[i], reload_opnum[r],
- reload_when_needed[r]))
+ if (i >= 0 && reload_reg_rtx[r] != 0)
{
- /* First, clear out memory of what used to be in this spill reg.
- If consecutive registers are used, clear them all. */
int nr
= HARD_REGNO_NREGS (spill_regs[i], GET_MODE (reload_reg_rtx[r]));
int k;
+ int part_reaches_end = 0;
+ int all_reaches_end = 1;
+ /* For a multi register reload, we need to check if all or part
+ of the value lives to the end. */
for (k = 0; k < nr; k++)
{
- reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]] = -1;
- reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]] = 0;
+ if (reload_reg_reaches_end_p (spill_regs[i] + k, reload_opnum[r],
+ reload_when_needed[r]))
+ part_reaches_end = 1;
+ else
+ all_reaches_end = 0;
}
- /* Maybe the spill reg contains a copy of reload_out. */
- if (reload_out[r] != 0 && GET_CODE (reload_out[r]) == REG)
+ /* Ignore reloads that don't reach the end of the insn in
+ entirety. */
+ if (all_reaches_end)
{
- register int nregno = REGNO (reload_out[r]);
- int nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1
- : HARD_REGNO_NREGS (nregno,
- GET_MODE (reload_reg_rtx[r])));
-
- spill_reg_store[i] = new_spill_reg_store[i];
- reg_last_reload_reg[nregno] = reload_reg_rtx[r];
-
- /* If NREGNO is a hard register, it may occupy more than
- one register. If it does, say what is in the
- rest of the registers assuming that both registers
- agree on how many words the object takes. If not,
- invalidate the subsequent registers. */
+ /* First, clear out memory of what used to be in this spill reg.
+ If consecutive registers are used, clear them all. */
- if (nregno < FIRST_PSEUDO_REGISTER)
- for (k = 1; k < nnr; k++)
- reg_last_reload_reg[nregno + k]
- = (nr == nnr ? gen_rtx (REG,
- reg_raw_mode[REGNO (reload_reg_rtx[r]) + k],
- REGNO (reload_reg_rtx[r]) + k)
- : 0);
-
- /* Now do the inverse operation. */
for (k = 0; k < nr; k++)
{
- reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]]
- = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr ? nregno
- : nregno + k);
- reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]] = insn;
+ reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]] = -1;
+ reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]] = 0;
}
- }
-
- /* Maybe the spill reg contains a copy of reload_in. Only do
- something if there will not be an output reload for
- the register being reloaded. */
- else if (reload_out[r] == 0
- && reload_in[r] != 0
- && ((GET_CODE (reload_in[r]) == REG
- && ! reg_has_output_reload[REGNO (reload_in[r])])
- || (GET_CODE (reload_in_reg[r]) == REG
- && ! reg_has_output_reload[REGNO (reload_in_reg[r])])))
- {
- register int nregno;
- int nnr;
- if (GET_CODE (reload_in[r]) == REG)
- nregno = REGNO (reload_in[r]);
- else
- nregno = REGNO (reload_in_reg[r]);
-
- nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1
- : HARD_REGNO_NREGS (nregno,
- GET_MODE (reload_reg_rtx[r])));
+ /* Maybe the spill reg contains a copy of reload_out. */
+ if (reload_out[r] != 0 && GET_CODE (reload_out[r]) == REG)
+ {
+ register int nregno = REGNO (reload_out[r]);
+ int nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1
+ : HARD_REGNO_NREGS (nregno,
+ GET_MODE (reload_reg_rtx[r])));
+
+ spill_reg_store[i] = new_spill_reg_store[i];
+ reg_last_reload_reg[nregno] = reload_reg_rtx[r];
+
+ /* If NREGNO is a hard register, it may occupy more than
+ one register. If it does, say what is in the
+ rest of the registers assuming that both registers
+ agree on how many words the object takes. If not,
+ invalidate the subsequent registers. */
+
+ if (nregno < FIRST_PSEUDO_REGISTER)
+ for (k = 1; k < nnr; k++)
+ reg_last_reload_reg[nregno + k]
+ = (nr == nnr
+ ? gen_rtx (REG,
+ reg_raw_mode[REGNO (reload_reg_rtx[r]) + k],
+ REGNO (reload_reg_rtx[r]) + k)
+ : 0);
+
+ /* Now do the inverse operation. */
+ for (k = 0; k < nr; k++)
+ {
+ reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]]
+ = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr
+ ? nregno
+ : nregno + k);
+ reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]] = insn;
+ }
+ }
- reg_last_reload_reg[nregno] = reload_reg_rtx[r];
+ /* Maybe the spill reg contains a copy of reload_in. Only do
+ something if there will not be an output reload for
+ the register being reloaded. */
+ else if (reload_out[r] == 0
+ && reload_in[r] != 0
+ && ((GET_CODE (reload_in[r]) == REG
+ && ! reg_has_output_reload[REGNO (reload_in[r])])
+ || (GET_CODE (reload_in_reg[r]) == REG
+ && ! reg_has_output_reload[REGNO (reload_in_reg[r])])))
+ {
+ register int nregno;
+ int nnr;
- if (nregno < FIRST_PSEUDO_REGISTER)
- for (k = 1; k < nnr; k++)
- reg_last_reload_reg[nregno + k]
- = (nr == nnr ? gen_rtx (REG,
- reg_raw_mode[REGNO (reload_reg_rtx[r]) + k],
- REGNO (reload_reg_rtx[r]) + k)
- : 0);
+ if (GET_CODE (reload_in[r]) == REG)
+ nregno = REGNO (reload_in[r]);
+ else
+ nregno = REGNO (reload_in_reg[r]);
- /* Unless we inherited this reload, show we haven't
- recently done a store. */
- if (! reload_inherited[r])
- spill_reg_store[i] = 0;
+ nnr = (nregno >= FIRST_PSEUDO_REGISTER ? 1
+ : HARD_REGNO_NREGS (nregno,
+ GET_MODE (reload_reg_rtx[r])));
+
+ reg_last_reload_reg[nregno] = reload_reg_rtx[r];
+
+ if (nregno < FIRST_PSEUDO_REGISTER)
+ for (k = 1; k < nnr; k++)
+ reg_last_reload_reg[nregno + k]
+ = (nr == nnr
+ ? gen_rtx (REG,
+ reg_raw_mode[REGNO (reload_reg_rtx[r]) + k],
+ REGNO (reload_reg_rtx[r]) + k)
+ : 0);
+
+ /* Unless we inherited this reload, show we haven't
+ recently done a store. */
+ if (! reload_inherited[r])
+ spill_reg_store[i] = 0;
+
+ for (k = 0; k < nr; k++)
+ {
+ reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]]
+ = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr
+ ? nregno
+ : nregno + k);
+ reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]]
+ = insn;
+ }
+ }
+ }
+ /* However, if part of the reload reaches the end, then we must
+ invalidate the old info for the part that survives to the end. */
+ else if (part_reaches_end)
+ {
for (k = 0; k < nr; k++)
- {
- reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]]
- = (nregno >= FIRST_PSEUDO_REGISTER || nr != nnr ? nregno
- : nregno + k);
- reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]]
- = insn;
- }
+ if (reload_reg_reaches_end_p (spill_regs[i] + k,
+ reload_opnum[r],
+ reload_when_needed[r]))
+ {
+ reg_reloaded_contents[spill_reg_order[spill_regs[i] + k]] = -1;
+ reg_reloaded_insn[spill_reg_order[spill_regs[i] + k]] = 0;
+ }
}
}
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