public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106322] tree-vectorize: Wrong code at O2 level (-fno-tree-vectorize is working) Date: Mon, 08 Aug 2022 10:00:13 +0000 [thread overview] Message-ID: <bug-106322-4-fT3fu3WViN@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-106322-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106322 --- Comment #18 from Mathieu Malaterre <malat at debian dot org> --- Brushed-up example (with Makefile): % more Makefile bytes.cc demo.cc :::::::::::::: Makefile :::::::::::::: CXXFLAGS := -O2 demo: demo.o bytes.o $(CXX) $(CXXFLAGS) -o $@ $^ -lhwy clean: rm -f bytes.o demo.o :::::::::::::: bytes.cc :::::::::::::: #include <cstring> bool BytesEqual2(const void *bytes1, const void *bytes2, const size_t size) { return memcmp(bytes1, bytes2, size) == 0; } :::::::::::::: demo.cc :::::::::::::: #include "hwy/aligned_allocator.h" #include "hwy/highway.h" #include <cstring> bool BytesEqual2(const void *p1, const void *p2, const size_t size); template <class D, class V> void AssertVecEqual2(D d, const uint16_t *expected, const V &actual) { const size_t N = 2; auto actual_lanes = hwy::AllocateAligned<uint16_t>(N); Store(actual, d, actual_lanes.get()); const uint8_t *expected_array = reinterpret_cast<const uint8_t *>(expected); const uint8_t *actual_array = reinterpret_cast<const uint8_t *>(actual_lanes.get()); for (size_t i = 0; i < N; ++i) { const uint8_t *expected_ptr = expected_array + i * 2; const uint8_t *actual_ptr = actual_array + i * 2; #if 1 // trigger bug if (!BytesEqual2(expected_ptr, actual_ptr, 2)) { #else // no bug if (std::memcmp(expected_ptr, actual_ptr, 2) != 0) { #endif abort(); } } } int main() { hwy::N_EMU128::FixedTag<uint16_t, 2> d; const size_t N = 2; hwy::AlignedFreeUniquePtr<uint16_t[]> in_lanes = hwy::AllocateAligned<uint16_t>(N); uint16_t expected_lanes[2]; in_lanes[0] = 65535; in_lanes[1] = 32767; expected_lanes[0] = 65534; expected_lanes[1] = 16383; hwy::N_EMU128::Vec128<uint16_t, 2> v = Load(d, in_lanes.get()); hwy::N_EMU128::Vec128<uint16_t, 2> actual = MulHigh(v, v); AssertVecEqual2(d, expected_lanes, actual); }
next prev parent reply other threads:[~2022-08-08 10:00 UTC|newest] Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-07-16 9:48 [Bug c++/106322] New: i386: Wrong code at O2 level (O0 / O1 are working) malat at debian dot org 2022-07-16 9:55 ` [Bug c++/106322] " malat at debian dot org 2022-07-16 10:00 ` malat at debian dot org 2022-07-16 10:00 ` malat at debian dot org 2022-07-16 10:02 ` malat at debian dot org 2022-07-16 10:02 ` malat at debian dot org 2022-07-16 10:07 ` malat at debian dot org 2022-07-16 10:15 ` malat at debian dot org 2022-07-17 20:20 ` [Bug target/106322] " pinskia at gcc dot gnu.org 2022-07-18 8:48 ` marxin at gcc dot gnu.org 2022-07-18 14:40 ` malat at debian dot org 2022-07-19 7:58 ` ubizjak at gmail dot com 2022-08-03 8:41 ` malat at debian dot org 2022-08-03 12:31 ` [Bug tree-optimization/106322] 32bits / tree-vectorize: Wrong code at O2 level (-fno-tree-vectorize is working) malat at debian dot org 2022-08-03 12:32 ` malat at debian dot org 2022-08-03 12:33 ` malat at debian dot org 2022-08-05 13:14 ` [Bug tree-optimization/106322] " malat at debian dot org 2022-08-08 7:12 ` malat at debian dot org 2022-08-08 7:20 ` malat at debian dot org 2022-08-08 10:00 ` malat at debian dot org [this message] 2022-08-09 7:50 ` malat at debian dot org 2022-08-09 12:36 ` marxin at gcc dot gnu.org 2022-08-09 12:58 ` malat at debian dot org 2022-08-09 13:00 ` ubizjak at gmail dot com 2022-08-09 13:03 ` malat at debian dot org 2022-08-09 13:04 ` marxin at gcc dot gnu.org 2022-08-09 13:05 ` malat at debian dot org 2022-08-09 13:11 ` [Bug tree-optimization/106322] [12/13 Regression] tree-vectorize: Wrong code at O2 level (-fno-tree-vectorize is working) since r12-2404-ga1d27560770818c5 marxin at gcc dot gnu.org 2022-08-09 13:12 ` marxin at gcc dot gnu.org 2022-08-09 13:26 ` linkw at gcc dot gnu.org 2022-08-09 13:29 ` marxin at gcc dot gnu.org 2022-08-09 13:30 ` malat at debian dot org 2022-08-09 13:34 ` malat at debian dot org 2022-08-09 13:40 ` linkw at gcc dot gnu.org 2022-08-09 13:48 ` rguenth at gcc dot gnu.org 2022-08-09 13:53 ` malat at debian dot org 2022-08-09 13:56 ` malat at debian dot org 2022-08-09 14:01 ` malat at debian dot org 2022-08-09 15:28 ` pinskia at gcc dot gnu.org 2022-08-10 5:25 ` linkw at gcc dot gnu.org 2022-08-10 5:34 ` linkw at gcc dot gnu.org 2022-08-10 6:03 ` pinskia at gcc dot gnu.org 2022-08-10 6:24 ` linkw at gcc dot gnu.org 2022-08-10 9:47 ` linkw at gcc dot gnu.org 2022-08-10 12:32 ` rguenth at gcc dot gnu.org 2022-08-10 12:36 ` rguenth at gcc dot gnu.org 2022-08-11 1:18 ` linkw at gcc dot gnu.org 2022-08-15 6:51 ` linkw at gcc dot gnu.org 2022-08-16 5:50 ` cvs-commit at gcc dot gnu.org 2022-08-24 2:31 ` [Bug tree-optimization/106322] [12 " cvs-commit at gcc dot gnu.org 2022-08-24 2:53 ` linkw at gcc dot gnu.org 2022-08-24 6:51 ` rguenth at gcc dot gnu.org 2022-09-27 14:14 ` malat at debian dot org 2022-09-27 14:18 ` malat at debian dot org 2022-09-28 6:11 ` malat at debian dot org 2022-09-28 6:26 ` 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-106322-4-fT3fu3WViN@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: linkBe 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).