| Issue |
91005
|
| Summary |
LLVM 18 regression: -Os causes Cannot select: t98: v8f16,ch = X86ISD::VBROADCAST_LOAD
|
| Labels |
bug,
backend:X86,
regression,
platform:macos
|
| Assignees |
|
| Reporter |
andrewrk
|
version: 18.1.5
```llvm
target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-macosx11.7.1-unknown"
%"compiler_rt.mulc3.Complex(f16)" = type { half, half }
; Function Attrs: minsize
define void @__mulhc3(ptr sret(%"compiler_rt.mulc3.Complex(f16)") %0, half %1, half %2, half %3, half %4) #0 {
%6 = call half @llvm.fabs.f16(half %1)
%7 = bitcast half %6 to i16
%8 = icmp eq i16 %7, 31744
%9 = call half @llvm.fabs.f16(half %2)
%10 = bitcast half %9 to i16
%11 = icmp eq i16 %10, 31744
%12 = select i1 %8, i1 true, i1 %11
br i1 %12, label %13, label %common.ret
common.ret: ; preds = %13, %5
ret void
13: ; preds = %5
%.1 = select i1 %11, half 0xH3C00, half 0xH0000
%14 = fmul half %.1, %2
%. = select i1 %8, half 0xH3C00, half 0xH0000
%15 = fmul half %., %1
%16 = fsub half %15, %14
store half %16, ptr %0, align 2
br label %common.ret
}
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare half @llvm.fabs.f16(half) #1
; uselistorder directives
uselistorder ptr @llvm.fabs.f16, { 1, 0 }
attributes #0 = { minsize "target-cpu"="ivybridge" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
```
```console
[nix-shell:~/src/zig/build-llvm18-release]$ ~/local/llvm18-assert/bin/clang -c reduced.ll -target x86_64-unknown-macosx11.7.1-unknown -Os
fatal error: error in backend: Cannot select: t98: v8f16,ch = X86ISD::VBROADCAST_LOAD<(load (s16) from constant-pool)> t0, t106
t106: i64 = X86ISD::WrapperRIP TargetConstantPool:i64<half 0xH7FFF> 0
t105: i64 = TargetConstantPool<half 0xH7FFF> 0
In function: __mulhc3
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /home/andy/local/llvm18-assert/bin/clang -c reduced.ll -target x86_64-unknown-macosx11.7.1-unknown -Os
1. Code generation
2. Running pass 'Function Pass Manager' on module 'reduced.ll'.
3. Running pass 'X86 DAG->DAG Instruction Selection' on function '@__mulhc3'
#0 0x000000000387f1eb llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/andy/local/llvm18-assert/bin/clang+0x387f1eb)
#1 0x000000000387c54b llvm::sys::RunSignalHandlers() (/home/andy/local/llvm18-assert/bin/clang+0x387c54b)
#2 0x00000000037c1736 llvm::CrashRecoveryContext::HandleExit(int) (/home/andy/local/llvm18-assert/bin/clang+0x37c1736)
#3 0x000000000387665e llvm::sys::Process::Exit(int, bool) (/home/andy/local/llvm18-assert/bin/clang+0x387665e)
#4 0x0000000000b798f5 LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
#5 0x00000000037cda89 llvm::report_fatal_error(llvm::Twine const&, bool) (/home/andy/local/llvm18-assert/bin/clang+0x37cda89)
#6 0x0000000004993618 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/home/andy/local/llvm18-assert/bin/clang+0x4993618)
#7 0x00000000049984ec llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/home/andy/local/llvm18-assert/bin/clang+0x49984ec)
#8 0x0000000002403bd7 (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
#9 0x000000000498e0b5 llvm::SelectionDAGISel::DoInstructionSelection() (/home/andy/local/llvm18-assert/bin/clang+0x498e0b5)
#10 0x000000000499c3a6 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/home/andy/local/llvm18-assert/bin/clang+0x499c3a6)
#11 0x00000000049a00fc llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/home/andy/local/llvm18-assert/bin/clang+0x49a00fc)
#12 0x00000000049a1ca7 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#13 0x000000000240a325 (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) X86ISelDAGToDAG.cpp:0:0
#14 0x0000000002c30035 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#15 0x0000000003213329 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/andy/local/llvm18-assert/bin/clang+0x3213329)
#16 0x0000000003213461 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/andy/local/llvm18-assert/bin/clang+0x3213461)
#17 0x0000000003213d67 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/andy/local/llvm18-assert/bin/clang+0x3213d67)
#18 0x0000000003aed923 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/home/andy/local/llvm18-assert/bin/clang+0x3aed923)
#19 0x00000000040cca5a clang::CodeGenAction::ExecuteAction() (/home/andy/local/llvm18-assert/bin/clang+0x40cca5a)
#20 0x000000000434ac29 clang::FrontendAction::Execute() (/home/andy/local/llvm18-assert/bin/clang+0x434ac29)
#21 0x00000000042d0562 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/andy/local/llvm18-assert/bin/clang+0x42d0562)
#22 0x00000000044189cf clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/andy/local/llvm18-assert/bin/clang+0x44189cf)
#23 0x0000000000b7b6da cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/andy/local/llvm18-assert/bin/clang+0xb7b6da)
#24 0x0000000000b736b7 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#25 0x000000000410de69 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#26 0x00000000037c1672 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/andy/local/llvm18-assert/bin/clang+0x37c1672)
#27 0x000000000410f554 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#28 0x00000000040d6445 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/andy/local/llvm18-assert/bin/clang+0x40d6445)
#29 0x00000000040d6f3d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/home/andy/local/llvm18-assert/bin/clang+0x40d6f3d)
#30 0x00000000040e1514 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/home/andy/local/llvm18-assert/bin/clang+0x40e1514)
#31 0x0000000000b78d79 clang_main(int, char**, llvm::ToolContext const&) (/home/andy/local/llvm18-assert/bin/clang+0xb78d79)
#32 0x0000000000a6fec3 main (/home/andy/local/llvm18-assert/bin/clang+0xa6fec3)
#33 0x00007f37fa23efce __libc_start_call_main (/nix/store/anlf335xlh41yjhm114swi87406mq5pw-glibc-2.38-44/lib/libc.so.6+0x27fce)
#34 0x00007f37fa23f089 __libc_start_main@GLIBC_2.2.5 (/nix/store/anlf335xlh41yjhm114swi87406mq5pw-glibc-2.38-44/lib/libc.so.6+0x28089)
#35 0x0000000000b72325 _start (/home/andy/local/llvm18-assert/bin/clang+0xb72325)
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
Target: x86_64-unknown-macosx11.7.1-unknown
Thread model: posix
InstalledDir: /home/andy/local/llvm18-assert/bin
clang: note: diagnostic msg: Error generating preprocessed source(s) - no preprocessable inputs.
```
Works fine with clang 17.0.6.
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