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| author | Bernd Schmidt <bernds_cb1@t-online.de> | 2019-11-24 13:20:55 +0000 |
|---|---|---|
| committer | Bernd Schmidt <bernds@gcc.gnu.org> | 2019-11-24 13:20:55 +0000 |
| commit | 74b9f8dfe18b51280ecb9b68e0de7d4f7e36e973 (patch) | |
| tree | 6367c944bf59f6574fa3c51442f757f93ef5042f /gcc/combine.c | |
| parent | 391500af1932e696a007b59d667079325d32d631 (diff) | |
| download | gcc-74b9f8dfe18b51280ecb9b68e0de7d4f7e36e973.zip gcc-74b9f8dfe18b51280ecb9b68e0de7d4f7e36e973.tar.gz gcc-74b9f8dfe18b51280ecb9b68e0de7d4f7e36e973.tar.bz2 | |
Allow combiner to create autoinc in jump insns.
* combine.c (can_combine_p): Allow autoinc in jumps.
From-SVN: r278656
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index f480633..2e21459 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -2110,22 +2110,19 @@ can_combine_p (rtx_insn *insn, rtx_insn *i3, rtx_insn *pred ATTRIBUTE_UNUSED, is_volatile_p = volatile_refs_p (PATTERN (insn)) ? volatile_refs_p : volatile_insn_p; - + for (p = NEXT_INSN (insn); p != i3; p = NEXT_INSN (p)) if (INSN_P (p) && p != succ && p != succ2 && is_volatile_p (PATTERN (p))) return 0; /* If INSN contains an autoincrement or autodecrement, make sure that register is not used between there and I3, and not already used in - I3 either. Neither must it be used in PRED or SUCC, if they exist. - Also insist that I3 not be a jump; if it were one - and the incremented register were spilled, we would lose. */ + I3 either. Neither must it be used in PRED or SUCC, if they exist. */ if (AUTO_INC_DEC) for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) if (REG_NOTE_KIND (link) == REG_INC - && (JUMP_P (i3) - || reg_used_between_p (XEXP (link, 0), insn, i3) + && (reg_used_between_p (XEXP (link, 0), insn, i3) || (pred != NULL_RTX && reg_overlap_mentioned_p (XEXP (link, 0), PATTERN (pred))) || (pred2 != NULL_RTX |