[llvm] r297232 - [InstCombine] shrink truncated splat shuffle (2nd try)

Wed Mar 8 06:40:09 PST 2017

Yes, that's my fault - forgot to handle the case where the shuffle result
does not have the same size as the input vector. Fix coming shortly. Thanks
for letting me know!

On Wed, Mar 8, 2017 at 6:10 AM, David Green <David.Green at arm.com> wrote:

> Hello
>
> I have an error which I believe is for you. Compiled with "clang -O3
> -target aarch64-linux-gnu -mcpu=cortex-a57 -c reduce.c"
>
> typedef __attribute__((neon_vector_type(8))) unsigned char a;
> typedef __attribute__((neon_vector_type(4))) short b;
> typedef __attribute__((neon_vector_type(8))) short c;
> typedef __attribute__((neon_vector_type(4))) int d;
> a f(d e) {
>   b g = __builtin_neon_vqrshrn_n_v(e, 3, 17);
>   c h = __builtin_shufflevector(g, g, 0, 0, 0, 0, 0, 0, 0, 0);
>   a i = __builtin_neon_vmovn_v(h, 16);
>   return i;
> }
>
> It's been heavily reduced from autogenerated code, so apologies for any
> weirdness.
>
>
> clang-5.0: ../lib/IR/Instructions.cpp:2592: static llvm::CastInst*
> llvm::CastInst::Create(llvm::Instruction::CastOps, llvm::Value*,
> llvm::Type*, const llvm::Twine&, llvm::Instruction*): Assertion
> `castIsValid(op, S, Ty) && "Invalid cast!"' failed.
> #0 0x00007f516f2924ea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
> (/work/llvm-git/build/bin/../lib/libLLVMSupport.so.5+0xf84ea)
> #1 0x00007f516f29050e llvm::sys::RunSignalHandlers()
> (/work/llvm-git/build/bin/../lib/libLLVMSupport.so.5+0xf650e)
> #2 0x00007f516f290672 SignalHandler(int) (/work/llvm-git/build/bin/../
> lib/libLLVMSupport.so.5+0xf6672)
> #3 0x00007f516dcb4cb0 (/lib/x86_64-linux-gnu/libc.so.6+0x36cb0)
> #4 0x00007f516dcb4c37 gsignal /build/eglibc-oGUzwX/eglibc-2.
> 19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
> #5 0x00007f516dcb8028 abort /build/eglibc-oGUzwX/eglibc-2.
> 19/stdlib/abort.c:91:0
> #6 0x00007f516dcadbf6 __assert_fail_base /build/eglibc-oGUzwX/eglibc-2.
> 19/assert/assert.c:92:0
> #7 0x00007f516dcadca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
> #8 0x00007f516fc344d7 (/work/llvm-git/build/bin/../
> lib/libLLVMCore.so.5+0x15b4d7)
> #9 0x00007f516f8a494f llvm::IRBuilder<llvm::TargetFolder, llvm::
> IRBuilderCallbackInserter>::CreateCast(llvm::Instruction::CastOps,
> llvm::Value*, llvm::Type*, llvm::Twine const&) (/work/llvm-git/build/bin/../
> lib/libLLVMInstCombine.so.5+0x1e94f)
> #10 0x00007f516f8e6957 llvm::InstCombiner::visitTrunc(llvm::TruncInst&)
> (/work/llvm-git/build/bin/../lib/libLLVMInstCombine.so.5+0x60957)
> #11 0x00007f516f8b366d llvm::InstCombiner::run()
> (/work/llvm-git/build/bin/../lib/libLLVMInstCombine.so.5+0x2d66d)
> #12 0x00007f516f8b44b3 combineInstructionsOverFunction(llvm::Function&,
> llvm::InstCombineWorklist&, llvm::AAResults*, llvm::AssumptionCache&,
> llvm::TargetLibraryInfo&, llvm::DominatorTree&, bool, llvm::LoopInfo*)
> (/work/llvm-git/build/bin/../lib/libLLVMInstCombine.so.5+0x2e4b3)
> #13 0x00007f516f8b488e llvm::InstructionCombiningPass::runOnFunction(llvm::Function&)
> (/work/llvm-git/build/bin/../lib/libLLVMInstCombine.so.5+0x2e88e)
> #14 0x00007f516fc4f383 llvm::FPPassManager::runOnFunction(llvm::Function&)
> (/work/llvm-git/build/bin/../lib/libLLVMCore.so.5+0x176383)
> #15 0x00007f516fc4f42c llvm::FPPassManager::runOnModule(llvm::Module&)
> (/work/llvm-git/build/bin/../lib/libLLVMCore.so.5+0x17642c)
> #16 0x00007f516fc5018f llvm::legacy::PassManagerImpl::run(llvm::Module&)
> (/work/llvm-git/build/bin/../lib/libLLVMCore.so.5+0x17718f)
> #17 0x00007f516e7220fa (anonymous namespace)::EmitAssemblyHelper::
> EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream,
> std::default_delete<llvm::raw_pwrite_stream> >)
> (/work/llvm-git/build/bin/../lib/libclangCodeGen.so.5+0xb30fa)
> #18 0x00007f516e7233e3 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
> clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
> clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
> const&, llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream,
> std::default_delete<llvm::raw_pwrite_stream> >)
> (/work/llvm-git/build/bin/../lib/libclangCodeGen.so.5+0xb43e3)
> #19 0x00007f516e8f07cc clang::BackendConsumer::
> HandleTranslationUnit(clang::ASTContext&) (/work/llvm-git/build/bin/../
> lib/libclangCodeGen.so.5+0x2817cc)
> #20 0x00007f516bde1532 clang::ParseAST(clang::Sema&, bool, bool)
> (/work/llvm-git/build/bin/../lib/../lib/libclangParse.so.5+0x2d532)
> #21 0x00007f516e8ef16a clang::CodeGenAction::ExecuteAction()
> (/work/llvm-git/build/bin/../lib/libclangCodeGen.so.5+0x28016a)
> #22 0x00007f516e443fd6 clang::FrontendAction::Execute()
> (/work/llvm-git/build/bin/../lib/libclangFrontend.so.5+0xc3fd6)
> #23 0x00007f516e411996 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
> (/work/llvm-git/build/bin/../lib/libclangFrontend.so.5+0x91996)
> #24 0x00007f516e37c624 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
> (/work/llvm-git/build/bin/../lib/libclangFrontendTool.so.5+0x3624)
> #25 0x00000000004120a8 cc1_main(llvm::ArrayRef<char const*>, char const*,
> void*) (/work/llvm-git/build/bin/clang-5.0+0x4120a8)
> #26 0x000000000040cf6a main (/work/llvm-git/build/bin/clang-5.0+0x40cf6a)
> #27 0x00007f516dc9ff45 __libc_start_main /build/eglibc-oGUzwX/eglibc-2.
> 19/csu/libc-start.c:321:0
> #28 0x000000000040d995 _start (/work/llvm-git/build/bin/
> clang-5.0+0x40d995)
> Stack dump:
> 0.      Program arguments: /work/llvm-git/build/bin/clang-5.0 -cc1
> -triple aarch64--linux-gnu -emit-obj -disable-free -main-file-name reduce.c
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array
> -target-cpu cortex-a57 -target-feature +neon -target-feature +crc
> -target-feature +crypto -target-abi aapcs -dwarf-column-info
> -debugger-tuning=gdb -coverage-notes-file /work/tmp/testing/emp/reduce/reduce.gcno
> -resource-dir /work/llvm-git/build/lib/clang/5.0.0 -internal-isystem
> /usr/local/include -internal-isystem /work/llvm-git/build/lib/clang/5.0.0/include
> -internal-externc-isystem /include -internal-externc-isystem /usr/include
> -O3 -fdebug-compilation-dir /work/tmp/testing/emp/reduce -ferror-limit 19
> -fmessage-length 88 -fallow-half-arguments-and-returns -fno-signed-char
> -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics
> -vectorize-loops -vectorize-slp -o reduce.o -x c reduce.c
> 1.      <eof> parser at end of file
> 2.      Per-module optimization passes
> 3.      Running pass 'Function Pass Manager' on module 'reduce.c'.
> 4.      Running pass 'Combine redundant instructions' on function '@f'
> clang-5.0: error: unable to execute command: Aborted (core dumped)
> clang-5.0: error: clang frontend command failed due to signal (use -v to
> see invocation)
> clang version 5.0.0 (http://llvm.org/git/clang.git
> 98183555eb52a2527e1e2b1952d493a5fc25085e) (http://llvm.org/git/llvm.git
> 4d6542726b49c649928255ead9f753e55a5c87f3)
> Target: aarch64--linux-gnu
> Thread model: posix
> InstalledDir: /work/llvm-git/build/bin
> clang-5.0: note: diagnostic msg: PLEASE submit a bug report to
> http://llvm.org/bugs/ and include the crash backtrace, preprocessed
> source, and associated run script.
> clang-5.0: note: diagnostic msg:
> ********************
>
> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
> Preprocessed source(s) and associated run script(s) are located at:
> clang-5.0: note: diagnostic msg: /tmp/reduce-73e99f.c
> clang-5.0: note: diagnostic msg: /tmp/reduce-73e99f.sh
> clang-5.0: note: diagnostic msg:
>
> ********************
>
>
> Cheers
> Dave
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