From: Richard Biener <richard.guenther@gmail.com>
To: "Jørgen Kvalsvik" <jorgen.kvalsvik@woven-planet.global>
Cc: gcc-patches@gcc.gnu.org, mliska@suse.cz
Subject: Re: [PATCH 1/2] gcov: test switch/break line counts
Date: Thu, 13 Oct 2022 13:39:36 +0200 [thread overview]
Message-ID: <CAFiYyc2ZOKp_8Z_xaCdkn8fdh9tv_7J7pyEiUbSUze5UETFELQ@mail.gmail.com> (raw)
In-Reply-To: <20221011124303.99673-1-jorgen.kvalsvik@woven-planet.global>
On Tue, Oct 11, 2022 at 2:43 PM Jørgen Kvalsvik
<jorgen.kvalsvik@woven-planet.global> wrote:
>
> The coverage support will under some conditions decide to split edges to
> accurately report coverage. By running the test suite with/without this
> edge splitting a small diff shows up, addressed by this patch, which
> should catch future regressions.
>
> Removing the edge splitting:
>
> $ diff --git a/gcc/profile.cc b/gcc/profile.cc
> --- a/gcc/profile.cc
> +++ b/gcc/profile.cc
> @@ -1244,19 +1244,7 @@ branch_prob (bool thunk)
> Don't do that when the locuses match, so
> if (blah) goto something;
> is not computed twice. */
> - if (last
> - && gimple_has_location (last)
> - && !RESERVED_LOCATION_P (e->goto_locus)
> - && !single_succ_p (bb)
> - && (LOCATION_FILE (e->goto_locus)
> - != LOCATION_FILE (gimple_location (last))
> - || (LOCATION_LINE (e->goto_locus)
> - != LOCATION_LINE (gimple_location (last)))))
> - {
> - basic_block new_bb = split_edge (e);
> - edge ne = single_succ_edge (new_bb);
> - ne->goto_locus = e->goto_locus;
> - }
> +
> if ((e->flags & (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL))
> && e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun))
> need_exit_edge = 1;
>
> Assuming the .gcov files from make chec-gcc RUNTESTFLAGS=gcov.exp are
> kept:
>
> $ diff -r no-split-edge with-split-edge | grep -C 2 -E "^[<>]\s\s"
> diff -r sans-split-edge/gcc/gcov-4.c.gcov with-split-edge/gcc/gcov-4.c.gcov
> 228c228
> < -: 224: break;
> ---
> > 1: 224: break;
> 231c231
> < -: 227: break;
> ---
> > #####: 227: break;
> 237c237
> < -: 233: break;
> ---
> > 2: 233: break;
>
> gcc/testsuite/ChangeLog:
OK.
Thanks,
Richard.
>
> * g++.dg/gcov/gcov-1.C: Add line count check.
> * gcc.misc-tests/gcov-4.c: Likewise.
> ---
> gcc/testsuite/g++.dg/gcov/gcov-1.C | 8 ++++----
> gcc/testsuite/gcc.misc-tests/gcov-4.c | 4 ++--
> 2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/gcc/testsuite/g++.dg/gcov/gcov-1.C b/gcc/testsuite/g++.dg/gcov/gcov-1.C
> index 9018b9a3a73..ee383b480a8 100644
> --- a/gcc/testsuite/g++.dg/gcov/gcov-1.C
> +++ b/gcc/testsuite/g++.dg/gcov/gcov-1.C
> @@ -257,20 +257,20 @@ test_switch (int i, int j)
> switch (i) /* count(5) */
> /* branch(end) */
> {
> - case 1:
> + case 1: /* count(1) */
> result = do_something (2); /* count(1) */
> - break;
> + break; /* count(1) */
> case 2:
> result = do_something (1024);
> break;
> - case 3:
> + case 3: /* count(3) */
> case 4:
> /* branch(67) */
> if (j == 2) /* count(3) */
> /* branch(end) */
> return do_something (4); /* count(1) */
> result = do_something (8); /* count(2) */
> - break;
> + break; /* count(2) */
> default:
> result = do_something (32); /* count(1) */
> switch_m++; /* count(1) */
> diff --git a/gcc/testsuite/gcc.misc-tests/gcov-4.c b/gcc/testsuite/gcc.misc-tests/gcov-4.c
> index 9d8ab1c1097..498d299b66b 100644
> --- a/gcc/testsuite/gcc.misc-tests/gcov-4.c
> +++ b/gcc/testsuite/gcc.misc-tests/gcov-4.c
> @@ -221,7 +221,7 @@ test_switch (int i, int j)
> {
> case 1:
> result = do_something (2); /* count(1) */
> - break;
> + break; /* count(1) */
> case 2:
> result = do_something (1024);
> break;
> @@ -230,7 +230,7 @@ test_switch (int i, int j)
> if (j == 2) /* count(3) */
> return do_something (4); /* count(1) */
> result = do_something (8); /* count(2) */
> - break;
> + break; /* count(2) */
> default:
> result = do_something (32); /* count(1) */
> switch_m++; /* count(1) */
> --
> 2.34.0
>
next prev parent reply other threads:[~2022-10-13 11:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-11 12:43 Jørgen Kvalsvik
2022-10-11 12:43 ` [PATCH 2/2] gcov: test line count for label in then/else block Jørgen Kvalsvik
2022-10-13 11:40 ` Richard Biener
2022-10-11 13:55 ` [PATCH 1/2] gcov: test switch/break line counts Michael Matz
2022-10-11 13:57 ` Jørgen Kvalsvik
2022-10-11 14:00 ` Michael Matz
2022-10-13 11:39 ` Richard Biener [this message]
2022-10-14 10:09 ` Jørgen Kvalsvik
-- strict thread matches above, loose matches on Subject: below --
2022-10-05 12:04 [PATCH 0/2] gcov: Split when edge locus differ from dest bb Jørgen Kvalsvik
2022-10-05 12:04 ` [PATCH 1/2] gcov: test switch/break line counts Jørgen Kvalsvik
2022-10-05 12:27 ` Martin Liška
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