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| author | Richard Stallman <rms@gnu.org> | 1993-11-06 21:50:29 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1993-11-06 21:50:29 +0000 |
| commit | b9b817f010ec5bdaaeff1d31e00adfb3f74b5c98 (patch) | |
| tree | 4c3ab00671bd320beaff1ae3bfc864feb9db456d /gcc/unroll.c | |
| parent | a39be5d99123923ddd09b846ee4a918d77c04260 (diff) | |
| download | gcc-b9b817f010ec5bdaaeff1d31e00adfb3f74b5c98.zip gcc-b9b817f010ec5bdaaeff1d31e00adfb3f74b5c98.tar.gz gcc-b9b817f010ec5bdaaeff1d31e00adfb3f74b5c98.tar.bz2 | |
(unroll_loop): Don't unroll loop if jump has combined
the original loop start label with another label.
From-SVN: r6028
Diffstat (limited to 'gcc/unroll.c')
| -rw-r--r-- | gcc/unroll.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/unroll.c b/gcc/unroll.c index 038c998..631abcc 100644 --- a/gcc/unroll.c +++ b/gcc/unroll.c @@ -600,6 +600,18 @@ unroll_loop (loop_end, insn_count, loop_start, end_insert_before, "Unrolling failure: unknown insns between BEG note and loop label.\n"); return; } + if (LABEL_NAME (start_label)) + { + /* The jump optimization pass must have combined the original start label + with a named label for a goto. We can't unroll this case because + jumps which go to the named label must be handled differently than + jumps to the loop start, and it is impossible to differentiate them + in this case. */ + if (loop_dump_stream) + fprintf (loop_dump_stream, + "Unrolling failure: loop start label is gone\n"); + return; + } if (unroll_type == UNROLL_NAIVE && GET_CODE (last_loop_insn) == BARRIER |