llc -fast asserts on first-class-struct parameter #4327
Description
| Bugzilla Link | 3955 |
| Resolution | FIXED |
| Resolved on | Apr 07, 2009 15:41 |
| Version | unspecified |
| OS | Linux |
| Attachments | bitcode that causes assertion failure in llc -fast |
| Reporter | LLVM Bugzilla Contributor |
| CC | @sunfishcode |
Extended Description
When I run llc -fast on the attached file, this is the result:
$ llc test.bc -f -fast
llc: ValueTypes.cpp:167: static llvm::MVT llvm::MVT::getMVT(const llvm::Type*, bool): Assertion `0 && "Unknown type!"' failed.
0 llc 0x0000000000ce5aef
1 llc 0x0000000000ce5ef9
2 libpthread.so.0 0x00007f0087e9b0f0
3 libc.so.6 0x00007f008719f015 gsignal + 53
4 libc.so.6 0x00007f00871a0b83 abort + 387
5 libc.so.6 0x00007f0087197d89 __assert_fail + 233
6 llc 0x0000000000c9a274 llvm::MVT::getMVT(llvm::Type const*, bool) + 708
7 llc 0x000000000093f5d7 llvm::FastISel::getRegForValue(llvm::Value*) + 119
8 llc 0x00000000007b09b5
9 llc 0x00000000007b25d5
10 llc 0x00000000009bbb7f llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function&, llvm::MachineFunction&, llvm::MachineModuleInfo*, llvm::DwarfWriter*, llvm::TargetInstrInfo const&) + 1263
11 llc 0x00000000009bcc96 llvm::SelectionDAGISel::runOnFunction(llvm::Function&) + 1286
12 llc 0x0000000000c82159 llvm::FPPassManager::runOnFunction(llvm::Function&) + 473
13 llc 0x0000000000c823fe llvm::FunctionPassManagerImpl::run(llvm::Function&) + 142
14 llc 0x0000000000c8260b llvm::FunctionPassManager::run(llvm::Function&) + 75
15 llc 0x0000000000509a19 main + 4473
16 libc.so.6 0x00007f008718a466 __libc_start_main + 230
17 llc 0x0000000000507ce9
Stack dump:
0. Program arguments: llc test.bc -f -fast
- Running pass 'X86 DAG->DAG Instruction Selection' on function '@foo'
Aborted
llc without -fast works fine.
The problem seems to be the struct type. If the call is changed to pass the i64 and i8* directly (and the declaration is changed to match) there's no assertion failure.