* Claudiu Zissulescu <claudiu.zissule...@synopsys.com> [2017-09-01 14:32:10
+0200]:
> 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.
Looks good to me.
Thanks,
Andrew
>
> 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
>
