[llvm-bugs] [Bug 48699] New: LLVM crashes when returning large values by-val an building for sparc64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48699

            Bug ID: 48699
           Summary: LLVM crashes when returning large values by-val an
                    building for sparc64
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: Sparc
          Assignee: unassignedbugs at nondot.org
          Reporter: simonas+llvm.org at kazlauskas.me
                CC: llvm-bugs at lists.llvm.org

Code

    define i2048 @test() unnamed_addr {
    start:
      ret i2048 0
    }

built with `llc -mtriple=sparc64` will fail with the following assertion:

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=sparc64 <source>
1.      Running pass 'Function Pass Manager' on module '<source>'.
2.      Running pass 'Remove dead machine instructions' on function '@test'
<snip>
 #4 0x000055c9d8d52d74 (anonymous
namespace)::DeadMachineInstructionElim::eliminateDeadMI(llvm::MachineFunction&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x1bc1d74)
 #5 0x000055c9d8d53313 (anonymous
namespace)::DeadMachineInstructionElim::runOnMachineFunction(llvm::MachineFunction&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x1bc2313)
 #6 0x000055c9d8e5e2c8
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x1ccd2c8)
 #7 0x000055c9d92355e7 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x20a45e7)
 #8 0x000055c9d9235d01 llvm::FPPassManager::runOnModule(llvm::Module&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x20a4d01)
 #9 0x000055c9d923507f llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x20a407f)
#10 0x000055c9d79aea4a compileModule(char**, llvm::LLVMContext&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x81da4a)
#11 0x000055c9d78ee267 main
(/opt/compiler-explorer/clang-trunk/bin/llc+0x75d267)
<snip>

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