efriedma-quic
commented
3 years ago Scalable autovec is supposed to be forced off, for now, because it isn't finished. This works correctly on the main branch. If you want to try experiment, you can try "-mllvm -scalable-vectorization=on".
Not sure why this isn't working correctly on 12.0... but 12.0.1 isn't taking patches at this point, and there aren't any other planned 12.0 releases, so we can't really backport a fix.
Extended Description
Compiling the following loop for SVE (vector-length-agnostic) crashes:
define LEN 1000
float a[LEN]; float b[LEN];
void func1() {
pragma clang loop vectorize_width(2, scalable)
}
[brank1@juawei-cn02 test]$ clang -march=armv8-a+sve -Ofast test.c -S -o test.s clang: /dev/shm/nassyr1/Kunpeng920/Clang/12.0.0/system-system/llvm-project-12.0.0.src/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp:6796: llvm::InstructionCost llvm::LoopVectorizationCostModel::getInterleaveGroupCost(llvm::Instruction *, llvm::ElementCount): Assertion `!VF.isScalable() && "scalable vectors not yet supported."' failed. PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump:
0 0x0000ffffa4da5970 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x215970)
1 0x0000ffffa4da37c4 llvm::sys::RunSignalHandlers() (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x2137c4)
2 0x0000ffffa4da4be0 llvm::sys::CleanupOnSignal(unsigned long) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x214be0)
3 0x0000ffffa4cd6648 (anonymous namespace)::CrashRecoveryContextImpl::HandleCrash(int, unsigned long) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x146648)
4 0x0000ffffa4cd67dc CrashRecoverySignalHandler(int) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x1467dc)
5 0x0000ffffa92d066c (linux-vdso.so.1+0x66c)
6 0x0000ffffa47c2c1c raise (/lib64/libc.so.6+0x32c1c)
7 0x0000ffffa47b07a8 abort (/lib64/libc.so.6+0x207a8)
8 0x0000ffffa47bc2e8 __assert_fail_base (/lib64/libc.so.6+0x2c2e8)
9 0x0000ffffa47bc350 __assert_perror_fail (/lib64/libc.so.6+0x2c350)
10 0x0000ffffa73f0ba0 llvm::LoopVectorizationCostModel::getInterleaveGroupCost(llvm::Instruction*, llvm::ElementCount) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0xf0ba0)
11 0x0000ffffa73f30c8 llvm::LoopVectorizationCostModel::setCostBasedWideningDecision(llvm::ElementCount) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0xf30c8)
12 0x0000ffffa73edf6c llvm::LoopVectorizationCostModel::collectUniformsAndScalars(llvm::ElementCount) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0xedf6c)
13 0x0000ffffa73f5f58 llvm::LoopVectorizationPlanner::plan(llvm::ElementCount, unsigned int) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0xf5f58)
14 0x0000ffffa7405010 llvm::LoopVectorizePass::processLoop(llvm::Loop*) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0x105010)
15 0x0000ffffa74085f4 llvm::LoopVectorizePass::runImpl(llvm::Function&, llvm::ScalarEvolution&, llvm::LoopInfo&, llvm::TargetTransformInfo&, llvm::DominatorTree&, llvm::BlockFrequencyInfo&, llvm::TargetLibraryInfo, llvm::DemandedBits&, llvm::AAResults&, llvm::AssumptionCache&, std::__1::function<llvm::LoopAccessInfo const& (llvm::Loop&)>&, llvm::OptimizationRemarkEmitter&, llvm::ProfileSummaryInfo) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0x1085f4)
16 0x0000ffffa74114a0 (anonymous namespace)::LoopVectorize::runOnFunction(llvm::Function&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMVectorize.so.12+0x1114a0)
17 0x0000ffffa5309438 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMCore.so.12+0x3d9438)
18 0x0000ffffa5310044 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMCore.so.12+0x3e0044)
19 0x0000ffffa5309a8c llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMCore.so.12+0x3d9a8c)
20 0x0000ffffa844ed04 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete >) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangCodeGen.so.12+0x26ed04)
21 0x0000ffffa872a2b0 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangCodeGen.so.12+0x54a2b0)
22 0x0000ffffa2113d4c clang::ParseAST(clang::Sema&, bool, bool) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangParse.so.12+0x73d4c)
23 0x0000ffffa6bcffe4 clang::FrontendAction::Execute() (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangFrontend.so.12+0x16ffe4)
24 0x0000ffffa6b63290 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangFrontend.so.12+0x103290)
25 0x0000ffffa8c35e78 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangFrontendTool.so.12+0x15e78)
26 0x000000000022aad0 cc1_main(llvm::ArrayRef<char const>, char const, void*) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12+0x22aad0)
27 0x0000000000226258 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12+0x226258)
28 0x0000ffffa68f9f98 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional >, std::1::basic_string<char, std::__1::char_traits, std:: 1::allocator >, bool) const::$_1>(long) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangDriver.so.12+0x109f98)
29 0x0000ffffa4cd6538 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libLLVMSupport.so.12+0x146538)
30 0x0000ffffa68f9568 clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional >, std::1::basic_string<char, std::__1::char_traits, std:: 1::allocator >, bool) const (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangDriver.so.12+0x109568)
31 0x0000ffffa68cad68 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangDriver.so.12+0xdad68)
32 0x0000ffffa68cb10c clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangDriver.so.12+0xdb10c)
33 0x0000ffffa68e00e4 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/libclangDriver.so.12+0xf00e4)
34 0x0000000000225600 main (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12+0x225600)
35 0x0000ffffa47b0be4 __libc_start_main (/lib64/libc.so.6+0x20be4)
36 0x0000000000222ac4 _start (/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12+0x222ac4)
clang-12: error: clang frontend command failed with exit code 134 (use -v to see invocation) clang version 12.0.0 Target: aarch64-unknown-linux-gnu Thread model: posix InstalledDir: /opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin clang-12: note: diagnostic msg:
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang-12: note: diagnostic msg: /tmp/test-23d031.c clang-12: note: diagnostic msg: /tmp/test-23d031.sh clang-12: note: diagnostic msg:
[brank1@juawei-cn02 test]$ cat /tmp/test-23d031.c
1 ""
1 "test.c"
define LEN 1000
float a[LEN]; float b[LEN];
void func1() {
pragma clang loop vectorize_width(2, scalable)
} [brank1@juawei-cn02 test]$ cat /tmp/test-23d031.sh
Crash reproducer for clang version 12.0.0
Driver args: "-march=armv8-a+sve" "-Ofast" "test.c" "-S" "-o" "test.s"
Original command: "/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12" "-cc1" "-triple" "aarch64-unknown-linux-gnu" "-S" "-disable-free" "-main-file-name" "test.c" "-mrelocation-model" "static" "-mframe-pointer=non-leaf" "-menable-no-infs" "-menable-no-nans" "-menable-unsafe-fp-math" "-fno-signed-zeros" "-mreassociate" "-freciprocal-math" "-ffp-contract=fast" "-fno-rounding-math" "-ffast-math" "-ffinite-math-only" "-mconstructor-aliases" "-munwind-tables" "-target-cpu" "generic" "-target-feature" "+neon" "-target-feature" "+sve" "-target-abi" "aapcs" "-fallow-half-arguments-and-returns" "-fno-split-dwarf-inlining" "-debugger-tuning=gdb" "-resource-dir" "/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/clang/12.0.0" "-I/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/ncurses/6.2-Clang-12.0.0/include" "-I/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/binutils/2.36.1-Clang-12.0.0/include" "-I/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/include" "-I/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/libedit/20210216/include" "-I/opt/ohpc/pub/libs/arm-optimized-routines-21.02/Kunpeng920/include" "-internal-isystem" "/usr/local/include" "-internal-isystem" "/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/lib/clang/12.0.0/include" "-internal-externc-isystem" "/include" "-internal-externc-isystem" "/usr/include" "-Ofast" "-fdebug-compilation-dir" "/home/jusers/brank1/juawei/test" "-ferror-limit" "19" "-fno-signed-char" "-fgnuc-version=4.2.1" "-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp" "-faddrsig" "-o" "test.s" "-x" "c" "test.c"
"/opt/ohpc/pub/easybuild/software/juaweihi1620/Stages/2021a/software/Clang/12.0.0/bin/clang-12" "-cc1" "-triple" "aarch64-unknown-linux-gnu" "-S" "-disable-free" "-main-file-name" "test.c" "-mrelocation-model" "static" "-mframe-pointer=non-leaf" "-menable-no-infs" "-menable-no-nans" "-menable-unsafe-fp-math" "-fno-signed-zeros" "-mreassociate" "-freciprocal-math" "-ffp-contract=fast" "-fno-rounding-math" "-ffast-math" "-ffinite-math-only" "-mconstructor-aliases" "-munwind-tables" "-target-cpu" "generic" "-target-feature" "+neon" "-target-feature" "+sve" "-target-abi" "aapcs" "-fallow-half-arguments-and-returns" "-fno-split-dwarf-inlining" "-debugger-tuning=gdb" "-Ofast" "-ferror-limit" "19" "-fno-signed-char" "-fgnuc-version=4.2.1" "-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp" "-faddrsig" "-x" "c" "test-23d031.c"