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| author | Claudiu Zissulescu <claziss@synopsys.com> | 2017-11-30 15:42:12 +0100 |
|---|---|---|
| committer | Claudiu Zissulescu <claziss@gcc.gnu.org> | 2017-11-30 15:42:12 +0100 |
| commit | a09202439b038a7e92900bdbe5aa6488b9409a18 (patch) | |
| tree | 9ded931435c2d2329430591a7fe9c439880f9238 /gcc/config/arc/arc.c | |
| parent | 5d4c34aaade8422c8289daa8a5c95fab7830de37 (diff) | |
| download | gcc-a09202439b038a7e92900bdbe5aa6488b9409a18.zip gcc-a09202439b038a7e92900bdbe5aa6488b9409a18.tar.gz gcc-a09202439b038a7e92900bdbe5aa6488b9409a18.tar.bz2 | |
[ARC] Don't allow the last ZOL insn to be in a delay slot.
The ARC ZOL implementation doesn't allow the last instruction to be a
control instruction or part of a delay slot. Thus, we add a note to
the last ZOL instruction which will prevent it to finish into a delay
slot.
2017-10-20 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.c (hwloop_optimize): Prevent the last
ZOL instruction to end into a delay slot.
* config/arc/arc.md (cond_delay_insn): Check if the instruction
can be placed into a delay slot against reg_note.
(in_delay_slot): Likewise.
testsuite/
2017-10-20 Claudiu Zissulescu <claziss@synopsys.com>
* gcc.target/arc/loop-3.c: New test.
* gcc.target/arc/loop-4.c: Likewise.
[FIX][ZOL] fix checking for jumps
From-SVN: r255275
Diffstat (limited to 'gcc/config/arc/arc.c')
| -rw-r--r-- | gcc/config/arc/arc.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c index 57ea502..6b6bf82 100644 --- a/gcc/config/arc/arc.c +++ b/gcc/config/arc/arc.c @@ -7408,6 +7408,12 @@ hwloop_optimize (hwloop_info loop) loop->loop_no); last_insn = emit_insn_after (gen_nopv (), last_insn); } + + /* SAVE_NOTE is used by haifa scheduler. However, we are after it + and we can use it to indicate the last ZOL instruction cannot be + part of a delay slot. */ + add_reg_note (last_insn, REG_SAVE_NOTE, GEN_INT (2)); + loop->last_insn = last_insn; /* Get the loop iteration register. */ |