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| author | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-06-20 17:16:10 +0000 |
|---|---|---|
| committer | bernds <bernds@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-06-20 17:16:10 +0000 |
| commit | 38e1b753bb83641aff79d39096a33f95ad64020b (patch) | |
| tree | 96ea288af6b7d30a2fff457fd710280aa4ed49cd /gcc/regrename.c | |
| parent | 26b68b7317b3451c7fd48868123dc28844412281 (diff) | |
| download | ppe42-gcc-38e1b753bb83641aff79d39096a33f95ad64020b.tar.gz ppe42-gcc-38e1b753bb83641aff79d39096a33f95ad64020b.zip | |
* regrename.c (scan_rtx_reg): Handle the case where we write to an
open chain in a smaller mode without failing the entire block.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@175225 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/regrename.c')
| -rw-r--r-- | gcc/regrename.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/gcc/regrename.c b/gcc/regrename.c index f313d084ee3..b83c7258fb7 100644 --- a/gcc/regrename.c +++ b/gcc/regrename.c @@ -721,25 +721,34 @@ scan_rtx_reg (rtx insn, rtx *loc, enum reg_class cl, enum scan_actions action, In either case, we remove this element from open_chains. */ if ((action == terminate_dead || action == terminate_write) - && superset) + && (superset || subset)) { unsigned nregs; head->terminated = 1; + if (subset && !superset) + head->cannot_rename = 1; head->next_chain = closed_chains; closed_chains = head; bitmap_clear_bit (&open_chains_set, head->id); nregs = head->nregs; while (nregs-- > 0) - CLEAR_HARD_REG_BIT (live_in_chains, head->regno + nregs); + { + CLEAR_HARD_REG_BIT (live_in_chains, head->regno + nregs); + if (subset && !superset + && (head->regno + nregs < this_regno + || head->regno + nregs >= this_regno + this_nregs)) + SET_HARD_REG_BIT (live_hard_regs, head->regno + nregs); + } *p = next; if (dump_file) fprintf (dump_file, - "Closing chain %s (%d) at insn %d (%s)\n", + "Closing chain %s (%d) at insn %d (%s%s)\n", reg_names[head->regno], head->id, INSN_UID (insn), - scan_actions_name[(int) action]); + scan_actions_name[(int) action], + superset ? ", superset" : subset ? ", subset" : ""); } else if (action == terminate_dead || action == terminate_write) { |
