From: claziss <claz...@synopsys.com> Hi Andrew,
By mistake I've pushed an incoplete ZOL-rework patch, and it missing the attached parts. Please can you check if it is ok? Thank you, Claudiu gcc/ 2017-09-01 Claudiu Zissulescu <claz...@synopsys.com> * config/arc/arc.c (hwloop_optimize): Account for empty body loops. testsuite/ 2017-09-01 Claudiu Zissulescu <claz...@synopsys.com> * gcc.target/arc/loop-1.c: Add test. --- gcc/config/arc/arc.c | 13 +++++++++++-- gcc/testsuite/gcc.target/arc/loop-1.c | 12 ++++++++++++ 2 files changed, 23 insertions(+), 2 deletions(-) create mode 100755 gcc/testsuite/gcc.target/arc/loop-1.c diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c index 52a9b24..d519063 100644 --- a/gcc/config/arc/arc.c +++ b/gcc/config/arc/arc.c @@ -7240,6 +7240,12 @@ 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)) @@ -7311,8 +7317,11 @@ 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) { diff --git a/gcc/testsuite/gcc.target/arc/loop-1.c b/gcc/testsuite/gcc.target/arc/loop-1.c new file mode 100755 index 0000000..274bb46 --- /dev/null +++ b/gcc/testsuite/gcc.target/arc/loop-1.c @@ -0,0 +1,12 @@ +/* { dg-do compile } */ +/* { dg-options "-O2" } */ + +/* Check how we handle empty body loops. */ + +int a; +void fn1(void) { + int i; + for (; i < 8; i++) { + double A[a]; + } +} -- 1.9.1