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(split_hard_reg_notes): Handle 0th sub register, and multiple register kills. 

(split_hard_reg_notes): Handle 0th sub register, and
multiple register kills.
(update_flow_info): For multi-word hard regs, use
split_hard_reg_notes to add all REG_DEAD notes, instead of just
the additional ones due to splitting.

From-SVN: r4460
This commit is contained in:
Jim Wilson 1993-05-14 14:16:34 -07:00
parent 65488bae3e
commit f52152d6ac
1 changed files with 19 additions and 18 deletions
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37
gcc/sched.c
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@ -3833,11 +3833,7 @@ split_hard_reg_notes (note, first, last, orig_insn)
n_regs = HARD_REGNO_NREGS (REGNO (reg), GET_MODE (reg));
/* ??? Could add check here to see whether, the hard register is referenced
in the same mode as in the original insn. If so, then it has not been
split, and the rest of the code below is unnecessary. */
for (i = 1; i < n_regs; i++)
for (i = 0; i < n_regs; i++)
{
new_reg = REGNO (reg) + i;
@ -3853,6 +3849,10 @@ split_hard_reg_notes (note, first, last, orig_insn)
XEXP (link, 0) = temp;
XEXP (link, 1) = REG_NOTES (insn);
REG_NOTES (insn) = link;
/* If killed multiple registers here, then add in the excess. */
i += HARD_REGNO_NREGS (REGNO (temp), GET_MODE (temp)) - 1;
break;
}
/* It isn't mentioned anywhere, so no new reg note is needed for
@ -4033,8 +4033,20 @@ update_flow_info (notes, first, last, orig_insn)
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i'
&& reg_mentioned_p (XEXP (note, 0), PATTERN (insn)))
{
XEXP (note, 1) = REG_NOTES (insn);
REG_NOTES (insn) = note;
/* If this note refers to a multiple word hard register, it
may have been split into several smaller hard register
references, so handle it specially. */
temp = XEXP (note, 0);
if (REG_NOTE_KIND (note) == REG_DEAD
&& GET_CODE (temp) == REG
&& REGNO (temp) < FIRST_PSEUDO_REGISTER
&& HARD_REGNO_NREGS (REGNO (temp), GET_MODE (temp)) > 1)
split_hard_reg_notes (note, first, last, orig_insn);
else
{
XEXP (note, 1) = REG_NOTES (insn);
REG_NOTES (insn) = note;
}
/* Sometimes need to convert REG_UNUSED notes to REG_DEAD
notes. */
@ -4061,17 +4073,6 @@ update_flow_info (notes, first, last, orig_insn)
break;
}
}
/* If this note refers to a multiple word hard register, it may
have been split into several smaller hard register references.
Check to see if there are any new register references that
need REG_NOTES added for them. */
temp = XEXP (note, 0);
if (REG_NOTE_KIND (note) == REG_DEAD
&& GET_CODE (temp) == REG
&& REGNO (temp) < FIRST_PSEUDO_REGISTER
&& HARD_REGNO_NREGS (REGNO (temp), GET_MODE (temp)))
split_hard_reg_notes (note, first, last, orig_insn);
break;
case REG_WAS_0: