rustc LLVM-18 float extension crash (LLVM-404) #103
Description
Checklist
- Checked the issue tracker for similar issues to ensure this is not a duplicate
- Read the documentation to confirm the issue is not addressed there and your configuration is set correctly
- Tested with the latest version to ensure the issue hasn't been fixed
How often does this bug occurs?
always
Expected behavior
Targets with float support to compile
Actual behavior (suspected bug)
It seems float extension i.e compiler support for going from f16 -> f32 is broken and produces the following LLVM error below.
Error logs or terminal output
rustc-LLVM ERROR: Cannot select: 0x7ff58d078ee0: f32 = fp16_to_fp 0x7ff58c609d10
0x7ff58c609d10: i32,ch = CopyFromReg 0x7ff58caa0fe0, Register:i32 %5
0x7ff58c07dc10: i32 = Register %5
In function: _ZN17compiler_builtins5float6extend13__extendhfsf217h7e81549493d256faE
error: could not compile `compiler_builtins` (lib)Steps to reproduce the behavior
- Download and unzip ll.zip
- Using LLC from the latest release of llvm 18 run
./llc compiler_builtins-41e65ec39b07922e.compiler_builtins.6ff7e3b67cc0ddd4-cgu.0.rcgu.ll - Observe an error like
LLVM ERROR: Cannot select: 0x565015758970: f32 = fp16_to_fp 0x56501563bec0
0x56501563bec0: i32,ch = CopyFromReg 0x56501462f2c0, Register:i32 %5
0x56501575ddb0: i32 = Register %5
In function: _ZN17compiler_builtins5float6extend13__extendhfsf217h7e81549493d256faE
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: ./llc /home/mabez/development/rust/embedded/hal/esp-hal/examples/target/xtensa-esp32-none-elf/release/deps/compiler_builtins-41e65ec39b07922e.compiler_builtins.6ff7e3b67cc0ddd4-cgu.0.rcgu.ll
1. Running pass 'Function Pass Manager' on module '/home/mabez/development/rust/embedded/hal/esp-hal/examples/target/xtensa-esp32-none-elf/release/deps/compiler_builtins-41e65ec39b07922e.compiler_builtins.6ff7e3b67cc0ddd4-cgu.0.rcgu.ll'.
2. Running pass 'Xtensa DAG->DAG Pattern Instruction Selection' on function '@_ZN17compiler_builtins5float6extend13__extendhfsf217h7e81549493d256faE'
#0 0x000056500e88d330 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (./llc+0x2d6a330)
#1 0x000056500e88a77b SignalHandler(int) Signals.cpp:0:0
#2 0x00007ffb18841960 (/lib64/libc.so.6+0x3c960)
#3 0x00007ffb1889326c (/lib64/libc.so.6+0x8e26c)
#4 0x00007ffb188418b6 raise (/lib64/libc.so.6+0x3c8b6)
#5 0x00007ffb188298b7 abort (/lib64/libc.so.6+0x248b7)
#6 0x000056500bde0e61 llvm::install_bad_alloc_error_handler(void (*)(void*, char const*, bool), void*) (.cold) ErrorHandling.cpp:0:0
#7 0x000056500e63b398 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (./llc+0x2b18398)
#8 0x000056500e63fc1b llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (./llc+0x2b1cc1b)
#9 0x000056500d141dcd (anonymous namespace)::XtensaDAGToDAGISel::Select(llvm::SDNode*) XtensaISelDAGToDAG.cpp:0:0
#10 0x000056500e63715c llvm::SelectionDAGISel::DoInstructionSelection() (./llc+0x2b1415c)
#11 0x000056500e642fda llvm::SelectionDAGISel::CodeGenAndEmitDAG() (./llc+0x2b1ffda)
#12 0x000056500e645c6b llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (./llc+0x2b22c6b)
#13 0x000056500e648445 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#14 0x000056500e649c61 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (./llc+0x2b26c61)
#15 0x000056500d8dc87d llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#16 0x000056500de54481 llvm::FPPassManager::runOnFunction(llvm::Function&) (./llc+0x2331481)
#17 0x000056500de54804 llvm::FPPassManager::runOnModule(llvm::Module&) (./llc+0x2331804)
#18 0x000056500de5632e llvm::legacy::PassManagerImpl::run(llvm::Module&) (./llc+0x233332e)
#19 0x000056500bef5e99 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#20 0x000056500bdf61d6 main (./llc+0x2d31d6)
#21 0x00007ffb1882b2e0 (/lib64/libc.so.6+0x262e0)
#22 0x00007ffb1882b399 __libc_start_main (/lib64/libc.so.6+0x26399)
#23 0x000056500beecab5 _start (./llc+0x3c9ab5)
[1] 20664 IOT instruction ./llc
Project release version
latest 18 release branch
System architecture
Intel/AMD 64-bit (modern PC, older Mac)
Operating system
Linux
Operating system version
Gentoo
Shell
ZSH
Additional context
No response