32-bit sparc backend fails to allocate by-value returns of 256 bytes

[nagisa]

Bugzilla Link	48698
Version	trunk
OS	All

Extended Description

Code

define i256 @test() unnamed_addr {
start:
  ret i256 0
}

built with llc -mtriple=sparc will fail with the following assertion:

LLVM ERROR: unable to allocate function return #​6
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.

Stack dump:

0.	Program arguments: /opt/compiler-explorer/clang-trunk/bin/llc -o ./output.s -mtriple=sparc <source>
1.	Running pass 'Function Pass Manager' on module '<source>'.
2.	Running pass 'SPARC DAG->DAG Pattern Instruction Selection' on function '@test'

#7 0x0000558c147c69b6 llvm::CCState::AnalyzeReturn(llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, bool (*)(unsigned int, llvm::MVT, llvm::MVT, llvm::CCValAssign::LocInfo, llvm::ISD::ArgFlagsTy, llvm::CCState&)) (/opt/compiler-explorer/clang-trunk/bin/llc+0x1b7e9b6)
#8 0x0000558c13f8c16d llvm::SparcTargetLowering::LowerReturn_32(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, llvm::SmallVectorImpl<llvm::SDValue> const&, llvm::SDLoc const&, llvm::SelectionDAG&) const (/opt/compiler-explorer/clang-trunk/bin/llc+0x134416d)
#9 0x0000558c151c77cb llvm::SelectionDAGBuilder::visitRet(llvm::ReturnInst const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x257f7cb)
#10 0x0000558c151ec4fc llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x25a44fc)

Compiler returned: 255

Possibly related to bug 27161

[rorth]

Still happens with llc from main as of 2022-07-08.

[koachan]

This is still happening as of 15git (commit 0a11ad2).

LLVM ERROR: unable to allocate function return #6
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: bin/llc -mtriple=sparc gh48042.ll
1.	Running pass 'Function Pass Manager' on module 'gh48042.ll'.
2.	Running pass 'SPARC DAG->DAG Pattern Instruction Selection' on function '@test'
 #0 0x00007f560d1c793a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/k/llvm-debug/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:569:11
 #1 0x00007f560d1c7aeb PrintStackTraceSignalHandler(void*) /home/k/llvm-debug/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:636:1
 #2 0x00007f560d1c6166 llvm::sys::RunSignalHandlers() /home/k/llvm-debug/src/llvm-project/llvm/lib/Support/Signals.cpp:103:5
 #3 0x00007f560d1c8215 SignalHandler(int) /home/k/llvm-debug/src/llvm-project/llvm/lib/Support/Unix/Signals.inc:407:1
 #4 0x00007f560b63e8e0 (/usr/lib/libc.so.6+0x3e8e0)
 #5 0x00007f560b68e36c (/usr/lib/libc.so.6+0x8e36c)
 #6 0x00007f560b63e838 gsignal (/usr/lib/libc.so.6+0x3e838)
 #7 0x00007f560b628535 abort (/usr/lib/libc.so.6+0x28535)
 #8 0x00007f560d04d314 llvm::report_fatal_error(llvm::Twine const&, bool) /home/k/llvm-debug/src/llvm-project/llvm/lib/Support/ErrorHandling.cpp:125:5
 #9 0x00007f560d6ddb1e llvm::CCState::AnalyzeReturn(llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, bool (*)(unsigned int, llvm::MVT, llvm::MVT, llvm::CCValAssign::LocInfo, llvm::ISD::ArgFlagsTy, llvm::CCState&)) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/CallingConvLower.cpp:118:3
#10 0x00007f5610ce3953 llvm::SparcTargetLowering::LowerReturn_32(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, llvm::SmallVectorImpl<llvm::SDValue> const&, llvm::SDLoc const&, llvm::SelectionDAG&) const /home/k/llvm-debug/src/llvm-project/llvm/lib/Target/Sparc/SparcISelLowering.cpp:223:11
#11 0x00007f5610ce2cc8 llvm::SparcTargetLowering::LowerReturn(llvm::SDValue, unsigned int, bool, llvm::SmallVectorImpl<llvm::ISD::OutputArg> const&, llvm::SmallVectorImpl<llvm::SDValue> const&, llvm::SDLoc const&, llvm::SelectionDAG&) const /home/k/llvm-debug/src/llvm-project/llvm/lib/Target/Sparc/SparcISelLowering.cpp:202:10
#12 0x00007f560e1297aa llvm::SelectionDAGBuilder::visitRet(llvm::ReturnInst const&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:2049:39
#13 0x00007f560e127da9 llvm::SelectionDAGBuilder::visit(unsigned int, llvm::User const&) /home/k/llvm-debug/src/llvm-project/llvm/include/llvm/IR/Instruction.def:127:1
#14 0x00007f560e1275ca llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:1128:8
#15 0x00007f560e222608 llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true, false, void>, false, true>, bool&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:675:3
#16 0x00007f560e22214b llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1591:11
#17 0x00007f560e21f6ca llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:464:3
#18 0x00007f5610cdf7a5 (anonymous namespace)::SparcDAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) /home/k/llvm-debug/src/llvm-project/llvm/lib/Target/Sparc/SparcISelDAGToDAG.cpp:40:5
#19 0x00007f560d9e5a47 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /home/k/llvm-debug/src/llvm-project/llvm/lib/CodeGen/MachineFunctionPass.cpp:73:8
#20 0x00007f560d4ab76e llvm::FPPassManager::runOnFunction(llvm::Function&) /home/k/llvm-debug/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1430:23
#21 0x00007f560d4b05f2 llvm::FPPassManager::runOnModule(llvm::Module&) /home/k/llvm-debug/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1476:16
#22 0x00007f560d4ac059 (anonymous namespace)::MPPassManager::runOnModule(llvm::Module&) /home/k/llvm-debug/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1545:23
#23 0x00007f560d4abbcd llvm::legacy::PassManagerImpl::run(llvm::Module&) /home/k/llvm-debug/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:535:16
#24 0x00007f560d4b08d1 llvm::legacy::PassManager::run(llvm::Module&) /home/k/llvm-debug/src/llvm-project/llvm/lib/IR/LegacyPassManager.cpp:1672:3
#25 0x000000000041916c compileModule(char**, llvm::LLVMContext&) /home/k/llvm-debug/src/llvm-project/llvm/tools/llc/llc.cpp:739:41
#26 0x00000000004174aa main /home/k/llvm-debug/src/llvm-project/llvm/tools/llc/llc.cpp:420:13
#27 0x00007f560b629290 (/usr/lib/libc.so.6+0x29290)
#28 0x00007f560b62934a __libc_start_main (/usr/lib/libc.so.6+0x2934a)
#29 0x0000000000416c95 _start /build/glibc/src/glibc/csu/../sysdeps/x86_64/start.S:117:0
Aborted

[koachan]

Possibly related to bug 27161

Also, just want to comment that this bug now lives as #27535 here in github, in case someone wants to check.

[brad0]

@koachan Can you please also re-check this one?

[koachan]

This (and #27535) seems to be fixed already in latest main.

https://godbolt.org/z/b3r8TYz6z

[brad0]

I am going to close this as resolved.