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| author | Doug Evans <dje@gnu.org> | 1996-01-12 22:47:32 +0000 |
|---|---|---|
| committer | Doug Evans <dje@gnu.org> | 1996-01-12 22:47:32 +0000 |
| commit | ef185f22f2c879365920487dcc3f8cbe5203a7f2 (patch) | |
| tree | c03d3b03b48853a6119c5823bd2fac2f1f9004c3 /gcc | |
| parent | 56d0ac720e91a1add303c73365f4241260fb5c19 (diff) | |
| download | gcc-ef185f22f2c879365920487dcc3f8cbe5203a7f2.zip gcc-ef185f22f2c879365920487dcc3f8cbe5203a7f2.tar.gz gcc-ef185f22f2c879365920487dcc3f8cbe5203a7f2.tar.bz2 | |
sched.c (schedule_block): Maintain a valid chain so emit_note_before works.
* sched.c (schedule_block): Maintain a valid chain so
emit_note_before works.
From-SVN: r10970
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/sched.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/gcc/sched.c b/gcc/sched.c index 150f68f..dd194e6b 100644 --- a/gcc/sched.c +++ b/gcc/sched.c @@ -1,5 +1,5 @@ /* Instruction scheduling pass. - Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc. + Copyright (C) 1992, 93-95, 1996 Free Software Foundation, Inc. Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by, and currently maintained by, Jim Wilson (wilson@cygnus.com) @@ -3909,6 +3909,14 @@ schedule_block (b, file) sched_n_insns += 1; NEXT_INSN (insn) = last; PREV_INSN (last) = insn; + + /* Maintain a valid chain so emit_note_before works. + This is necessary because PREV_INSN (insn) isn't valid and + if it points to an insn already scheduled, a circularity + will result. */ + NEXT_INSN (prev_head) = insn; + PREV_INSN (insn) = prev_head; + last = insn; /* Check to see if we need to re-emit any notes here. */ @@ -3946,6 +3954,14 @@ schedule_block (b, file) sched_n_insns += 1; NEXT_INSN (insn) = last; PREV_INSN (last) = insn; + + /* Maintain a valid chain so emit_note_before works. + This is necessary because PREV_INSN (insn) isn't valid and + if it points to an insn already scheduled, a circularity + will result. */ + NEXT_INSN (prev_head) = insn; + PREV_INSN (insn) = prev_head; + last = insn; last = reemit_notes (insn, last); |