[llvm-bugs] [Bug 48698] New: 32-bit sparc backend fails to allocate by-value returns of 256 bytes

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48698

            Bug ID: 48698
           Summary: 32-bit sparc backend fails to allocate by-value
                    returns of 256 bytes
           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 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'
<snip>
 #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)
<snip>
Compiler returned: 255

Possibly related to bug 27161

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