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| author | Jim Wilson <wilson@gcc.gnu.org> | 1993-03-02 13:05:09 -0800 |
|---|---|---|
| committer | Jim Wilson <wilson@gcc.gnu.org> | 1993-03-02 13:05:09 -0800 |
| commit | 51ec2375642c91567b231ddb9e06f61e33734a89 (patch) | |
| tree | 561932c501fedb3497ffd35244fd795ed845f535 /gcc | |
| parent | fda792c6b67ea6b7d1e8b92b813b7f85e1d12f24 (diff) | |
| download | gcc-51ec2375642c91567b231ddb9e06f61e33734a89.zip gcc-51ec2375642c91567b231ddb9e06f61e33734a89.tar.gz gcc-51ec2375642c91567b231ddb9e06f61e33734a89.tar.bz2 | |
(relax_delay_slots): Delete jump around insn identical
to the insn in its delay slot.
From-SVN: r3606
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/reorg.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/reorg.c b/gcc/reorg.c index efbc078..e78c44c 100644 --- a/gcc/reorg.c +++ b/gcc/reorg.c @@ -3440,6 +3440,19 @@ relax_delay_slots (first) continue; } + /* See if this is an unconditional jump around a single insn which is + identical to the one in its delay slot. In this case, we can just + delete the branch and the insn in its delay slot. */ + if (next && GET_CODE (next) == INSN + && prev_label (next_active_insn (next)) == target_label + && simplejump_p (insn) + && XVECLEN (pat, 0) == 2 + && rtx_equal_p (PATTERN (next), PATTERN (XVECEXP (pat, 0, 1)))) + { + delete_insn (insn); + continue; + } + /* See if this jump (with its delay slots) branches around another jump (without delay slots). If so, invert this jump and point it to the target of the second jump. We cannot do this for |