Summary: AsyncUDPSocket test cases are crashing when running under llvm15. During debugging it seems that the issue is the fact that the code tries to allocated 0 size array. Changing the code to prevent such allocation. This is not very clean why to fix, but I am not sure if there is better one. Please let me know if you have any suggestions. Sample crash: ``` $ buck test //folly/io/async/test:async_udp_socket_test ... stdout: Note: Google Test filter = AsyncUDPSocketTest.TestDetachAttach [==========] Running 1 test from 1 test suite. [----------] Global test environment set-up. [----------] 1 test from AsyncUDPSocketTest [ RUN ] AsyncUDPSocketTest.TestDetachAttach stderr: fbcode/folly/io/async/AsyncUDPSocket.cpp:699:10: runtime error: variable length array bound evaluates to non-positive value 0 #0 0x7f4d8ed93704 in folly::AsyncUDPSocket::writev(folly::SocketAddress const&, iovec const*, unsigned long, int) fbcode/folly/io/async/AsyncUDPSocket.cpp:698 milvus-io#1 0x7f4d8ed9081f in folly::AsyncUDPSocket::writeGSO(folly::SocketAddress const&, std::unique_ptr<folly::IOBuf, std::default_delete<folly::IOBuf>> const&, int) fbcode/folly/io/async/AsyncUDPSocket.cpp:528 milvus-io#2 0x7f4d8ed900b2 in folly::AsyncUDPSocket::write(folly::SocketAddress const&, std::unique_ptr<folly::IOBuf, std::default_delete<folly::IOBuf>> const&) fbcode/folly/io/async/AsyncUDPSocket.cpp:660 milvus-io#3 0x350a05 in AsyncUDPSocketTest_TestDetachAttach_Test::TestBody() fbcode/folly/io/async/test/AsyncUDPSocketTest.cpp:914 milvus-io#4 0x7f4d90dd1ad5 in testing::Test::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2682:50 milvus-io#5 0x7f4d90dd1ad5 in testing::Test::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2672:6 milvus-io#6 0x7f4d90dd1c64 in testing::TestInfo::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2861:14 milvus-io#7 0x7f4d90dd1c64 in testing::TestInfo::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2833:6 milvus-io#8 0x7f4d90dd2321 in testing::TestSuite::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:3015:31 milvus-io#9 0x7f4d90dd2321 in testing::TestSuite::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2993:6 milvus-io#10 0x7f4d90dd2b1e in testing::internal::UnitTestImpl::RunAllTests() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:5855:47 milvus-io#11 0x7f4d90dd1d87 in bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*) /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:2665:29 milvus-io#12 0x7f4d90dd1d87 in testing::UnitTest::Run() /home/engshare/third-party2/googletest/1.11.0/src/googletest/googletest/src/gtest.cc:5438:55 milvus-io#13 0x7f4d90d5c990 in RUN_ALL_TESTS() fbcode/third-party-buck/platform010/build/googletest/include/gtest/gtest.h:2490 milvus-io#14 0x7f4d90d5c618 in main fbcode/common/gtest/LightMain.cpp:20 milvus-io#15 0x7f4d8ea2c656 in __libc_start_call_main /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/csu/../sysdeps/nptl/libc_start_call_main.h:58:16 milvus-io#16 0x7f4d8ea2c717 in __libc_start_main@GLIBC_2.2.5 /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/csu/../csu/libc-start.c:409:3 milvus-io#17 0x33ea60 in _start /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/csu/../sysdeps/x86_64/start.S:116 ... ``` Reviewed By: russoue, dmm-fb Differential Revision: D43858875 fbshipit-source-id: 93749bab17027b6dfc0dbc01b6c183e501a5494c

Support runtime SIMD #1

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