* Claudiu Zissulescu <claudiu.zissule...@synopsys.com> [2017-11-27 12:09:51
+0100]:
> From: claziss <claz...@synopsys.com>
>
> Make sure we mark the hw-loop labels as beeing used.
>
> gcc/
> 2017-09-19 Claudiu Zissulescu <claz...@synopsys.com>
>
> * config/arc/arc.c (hwloop_optimize): Update hw-loop's end/start
> labels number of usages.
>
> gcc/testsuite
> 2017-09-19 Claudiu Zissulescu <claz...@synopsys.com>
>
> * gcc.target/arc/loop-2.cpp: New test.
Looks good.
Thanks,
Andrew
> ---
> gcc/config/arc/arc.c | 3 +++
> gcc/testsuite/gcc.target/arc/loop-2.cpp | 18 ++++++++++++++++++
> 2 files changed, 21 insertions(+)
> create mode 100644 gcc/testsuite/gcc.target/arc/loop-2.cpp
>
> diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
> index 25f123c..964815a 100644
> --- a/gcc/config/arc/arc.c
> +++ b/gcc/config/arc/arc.c
> @@ -7702,6 +7702,9 @@ hwloop_optimize (hwloop_info loop)
> /* Insert the loop end label before the last instruction of the
> loop. */
> emit_label_after (end_label, loop->last_insn);
> + /* Make sure we mark the begining and end label as used. */
> + LABEL_NUSES (loop->end_label)++;
> + LABEL_NUSES (loop->start_label)++;
>
> return true;
> }
> diff --git a/gcc/testsuite/gcc.target/arc/loop-2.cpp
> b/gcc/testsuite/gcc.target/arc/loop-2.cpp
> new file mode 100644
> index 0000000..d1dc917
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/arc/loop-2.cpp
> @@ -0,0 +1,18 @@
> +/* { dg-options "-O2" } *
> +/* { dg-do assemble } */
> +
> +/* This file fails to assemble if we forgot to increase the number of
> + uses for loop's start and end labels. */
> +int a, c, d;
> +int *b;
> +void fn1(int p1) {
> + if (d == 5)
> + for (int i; i < p1; ++i)
> + if (c)
> + b[i] = c;
> + else
> + int t = a = t;
> + else
> + for (int i; i < p1; ++i)
> + b[i] = 0;
> +}
> --
> 1.9.1
>
