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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-05-14 14:16:34 -0700 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-05-14 14:16:34 -0700 |
| commit | f52152d6acbf1118835ce6832685d8da00074daf (patch) | |
| tree | 265f9f8d78fdff8ef42a9bbe0344762e257ac114 /gcc | |
| parent | 65488bae3e420f9381fe2ff2b217317e1cf58509 (diff) | |
| download | gcc-f52152d6acbf1118835ce6832685d8da00074daf.zip gcc-f52152d6acbf1118835ce6832685d8da00074daf.tar.gz gcc-f52152d6acbf1118835ce6832685d8da00074daf.tar.bz2 | |
(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
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/sched.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/gcc/sched.c b/gcc/sched.c index 434f768..1797d1c 100644 --- a/gcc/sched.c +++ b/gcc/sched.c @@ -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: |