public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111591] ppc64be: miscompilation with -mstrict-align / -O3
Date: Tue, 31 Oct 2023 06:40:29 +0000 [thread overview]
Message-ID: <bug-111591-4-W8jsuyZBGT@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111591-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111591
--- Comment #32 from Kewen Lin <linkw at gcc dot gnu.org> ---
> case pass, but the original test case (#c1) can't pass with this, it can't
> pass with -fstack-reuse=none + -fno-strict-aliasing + -O2 either, I think
> the original case still suffers another latent bug.
Well, I spent some time to narrow down the remaining issue on #c1 and found the
test case reduction generated unexpected test source (uninitialized array which
is used for assert comparison), it locates at below lines 438 to line 439:
428 struct TestSatWidenMulPairwiseAdd {
429 template <typename TN, class DN> void operator()(TN, DN dn) {
430 using TN_U = MakeUnsigned<TN>;
431 using TW = MakeWide<TN>;
432 RepartitionToWide<DN> dw;
433 using VW = Vec<decltype(dw)>;
434 using VN = Vec<decltype(dn)>;
435 size_t NN = Lanes(dn), NW = Lanes(dw), kMaxLanesPerNBlock =
sizeof(TN),
436 kMaxLanesPerWBlock = sizeof(TW);
437 RebindToUnsigned<decltype(dn)> dn_u;
438 VW f0;
439 VN nf0, nf1 = Set(dn, TN{});
440 AssertVecEqual(dw, f0, SatWidenMulPairwiseAdd(dw, BitCast(dn_u,
nf0), nf0),
441 "", 0);
The expected result is f0 while the one used for the following
SatWidenMulPairwiseAdd computation is nf0, both are not initialized.
I'd expect they are initialized, like:
VW f0 = Set(dw, TW{});
VN nf0 = Set(dn, TN{});
So IMHO #c1 test case is problematic, hi @Mathieu, could you have a double
check?
next prev parent reply other threads:[~2023-10-31 6:40 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-25 11:53 [Bug target/111591] New: " malat at debian dot org
2023-09-25 11:55 ` [Bug target/111591] " malat at debian dot org
2023-09-25 11:59 ` rguenth at gcc dot gnu.org
2023-09-25 12:20 ` malat at debian dot org
2023-09-25 13:15 ` malat at debian dot org
2023-09-25 13:41 ` malat at debian dot org
2023-09-26 6:50 ` linkw at gcc dot gnu.org
2023-09-26 7:56 ` rguenth at gcc dot gnu.org
2023-09-26 8:14 ` linkw at gcc dot gnu.org
2023-09-26 9:28 ` malat at debian dot org
2023-09-26 9:28 ` malat at debian dot org
2023-09-26 9:31 ` malat at debian dot org
2023-09-26 9:31 ` malat at debian dot org
2023-09-27 9:24 ` linkw at gcc dot gnu.org
2023-09-27 9:26 ` rguenth at gcc dot gnu.org
2023-09-28 0:20 ` linkw at gcc dot gnu.org
2023-10-13 10:19 ` linkw at gcc dot gnu.org
2023-10-13 11:08 ` rguenth at gcc dot gnu.org
2023-10-13 12:09 ` linkw at gcc dot gnu.org
2023-10-13 12:32 ` rguenth at gcc dot gnu.org
2023-10-16 9:11 ` linkw at gcc dot gnu.org
2023-10-19 7:27 ` linkw at gcc dot gnu.org
2023-10-19 11:06 ` rguenth at gcc dot gnu.org
2023-10-19 11:12 ` rguenth at gcc dot gnu.org
2023-10-20 5:53 ` linkw at gcc dot gnu.org
2023-10-20 6:25 ` rguenth at gcc dot gnu.org
2023-10-23 3:21 ` linkw at gcc dot gnu.org
2023-10-23 9:48 ` rguenth at gcc dot gnu.org
2023-10-23 12:36 ` matz at gcc dot gnu.org
2023-10-23 13:30 ` rguenth at gcc dot gnu.org
2023-10-23 14:04 ` rguenth at gcc dot gnu.org
2023-10-24 2:59 ` linkw at gcc dot gnu.org
2023-10-31 6:40 ` linkw at gcc dot gnu.org [this message]
2023-12-13 8:00 ` cvs-commit at gcc dot gnu.org
2023-12-13 8:02 ` rguenth at gcc dot gnu.org
2023-12-13 8:12 ` rguenth at gcc dot gnu.org
2023-12-15 7:32 ` malat at debian dot org
2023-12-15 7:43 ` rguenth at gcc dot gnu.org
2023-12-15 10:01 ` linkw at gcc dot gnu.org
2023-12-15 10:23 ` rguenth at gcc dot gnu.org
2023-12-15 11:28 ` malat at debian dot org
2023-12-15 11:32 ` rguenth at gcc dot gnu.org
2023-12-18 6:01 ` linkw at gcc dot gnu.org
2023-12-18 6:03 ` linkw at gcc dot gnu.org
2023-12-19 5:38 ` linkw at gcc dot gnu.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-111591-4-W8jsuyZBGT@http.gcc.gnu.org/bugzilla/ \
--to=gcc-bugzilla@gcc.gnu.org \
--cc=gcc-bugs@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).