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| author | Claudiu Zissulescu <claziss@synopsys.com> | 2017-11-02 11:20:18 +0100 |
|---|---|---|
| committer | Claudiu Zissulescu <claziss@gcc.gnu.org> | 2017-11-02 11:20:18 +0100 |
| commit | 5b5905bb077f26ba6f4a3167817da888b736d623 (patch) | |
| tree | 6c4860ad31f42bf04b31db047573a2697ecef415 /gcc/config | |
| parent | 331b46738ccd56303d226aeedf3c9ed0c6b02175 (diff) | |
| download | gcc-5b5905bb077f26ba6f4a3167817da888b736d623.zip gcc-5b5905bb077f26ba6f4a3167817da888b736d623.tar.gz gcc-5b5905bb077f26ba6f4a3167817da888b736d623.tar.bz2 | |
[ARC][ZOL] Account for empty body loops
gcc/
2017-11-02 Claudiu Zissulescu <claziss@synopsys.com>
* config/arc/arc.c (hwloop_optimize): Account for empty
body loops.
testsuite/
2017-11-02 Claudiu Zissulescu <claziss@synopsys.com>
* gcc.target/arc/loop-1.c: Add test.
From-SVN: r254339
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/arc/arc.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c index a0b66758..7336fad 100644 --- a/gcc/config/arc/arc.c +++ b/gcc/config/arc/arc.c @@ -7183,6 +7183,12 @@ hwloop_optimize (hwloop_info loop) fprintf (dump_file, ";; loop %d too long\n", loop->loop_no); return false; } + else if (!loop->length) + { + if (dump_file) + fprintf (dump_file, ";; loop %d is empty\n", loop->loop_no); + return false; + } /* Check if we use a register or not. */ if (!REG_P (loop->iter_reg)) @@ -7254,8 +7260,11 @@ hwloop_optimize (hwloop_info loop) && INSN_P (last_insn) && (JUMP_P (last_insn) || CALL_P (last_insn) || GET_CODE (PATTERN (last_insn)) == SEQUENCE - || get_attr_type (last_insn) == TYPE_BRCC - || get_attr_type (last_insn) == TYPE_BRCC_NO_DELAY_SLOT)) + /* At this stage we can have (insn (clobber (mem:BLK + (reg)))) instructions, ignore them. */ + || (GET_CODE (PATTERN (last_insn)) != CLOBBER + && (get_attr_type (last_insn) == TYPE_BRCC + || get_attr_type (last_insn) == TYPE_BRCC_NO_DELAY_SLOT)))) { if (loop->length + 2 > ARC_MAX_LOOP_LENGTH) { |