Optimized IR:
/// @use-src 0:"name_simplifier/input.sol"
object "C_59" {
    code {
        {
            /// @src 0:346:625  "contract C {..."
            let _1 := memoryguard(0x80)
            mstore(64, _1)
            if callvalue() { revert(0, 0) }
            let _2 := datasize("C_59_deployed")
            codecopy(_1, dataoffset("C_59_deployed"), _2)
            return(_1, _2)
        }
    }
    /// @use-src 0:"name_simplifier/input.sol"
    object "C_59_deployed" {
        code {
            {
                /// @src 0:346:625  "contract C {..."
                mstore(64, memoryguard(0x80))
                if iszero(lt(calldatasize(), 4))
                {
                    let _1 := 0
                    if eq(0xf8eddcc6, shr(224, calldataload(_1)))
                    {
                        if callvalue() { revert(_1, _1) }
                        let _2 := 32
                        if slt(add(calldatasize(), not(3)), _2) { revert(_1, _1) }
                        let offset := calldataload(4)
                        let _3 := 0xffffffffffffffff
                        if gt(offset, _3) { revert(_1, _1) }
                        if iszero(slt(add(offset, 35), calldatasize())) { revert(_1, _1) }
                        let _4 := calldataload(add(4, offset))
                        if gt(_4, _3) { panic_error_0x41() }
                        let _5 := shl(5, _4)
                        let dst := allocate_memory(add(_5, _2))
                        let dst_1 := dst
                        mstore(dst, _4)
                        dst := add(dst, _2)
                        let srcEnd := add(add(offset, _5), 36)
                        if gt(srcEnd, calldatasize()) { revert(_1, _1) }
                        let src := add(offset, 36)
                        for { } lt(src, srcEnd) { src := add(src, _2) }
                        {
                            if slt(sub(calldatasize(), src), _2) { revert(_1, _1) }
                            let value := allocate_memory_1307()
                            mstore(value, calldataload(src))
                            mstore(dst, value)
                            dst := add(dst, _2)
                        }
                        let ret, ret_1 := fun_sumArray(dst_1)
                        let memPos := mload(64)
                        return(memPos, sub(abi_encode_uint256_string(memPos, ret, ret_1), memPos))
                    }
                }
                revert(0, 0)
            }
            function panic_error_0x41()
            {
                mstore(0, shl(224, 0x4e487b71))
                mstore(4, 0x41)
                revert(0, 0x24)
            }
            function allocate_memory_1307() -> memPtr
            {
                memPtr := mload(64)
                let newFreePtr := add(memPtr, 32)
                if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { panic_error_0x41() }
                mstore(64, newFreePtr)
            }
            function allocate_memory(size) -> memPtr
            {
                memPtr := mload(64)
                let newFreePtr := add(memPtr, and(add(size, 31), not(31)))
                if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { panic_error_0x41() }
                mstore(64, newFreePtr)
            }
            function abi_encode_uint256_string(headStart, value0, value1) -> tail
            {
                mstore(headStart, value0)
                let _1 := 32
                mstore(add(headStart, _1), 64)
                let length := mload(value1)
                mstore(add(headStart, 64), length)
                let i := 0
                for { } lt(i, length) { i := add(i, _1) }
                {
                    mstore(add(add(headStart, i), 96), mload(add(add(value1, i), _1)))
                }
                if gt(i, length)
                {
                    mstore(add(add(headStart, length), 96), 0)
                }
                tail := add(add(headStart, and(add(length, 31), not(31))), 96)
            }
            function panic_error_0x32()
            {
                mstore(0, shl(224, 0x4e487b71))
                mstore(4, 0x32)
                revert(0, 0x24)
            }
            /// @ast-id 58 @src 0:381:623  "function sumArray(S[] memory _s) public returns (uint, string memory) {..."
            function fun_sumArray(var_s_mpos) -> var, var_mpos
            {
                /// @src 0:346:625  "contract C {..."
                if iszero(mload(var_s_mpos)) { panic_error_0x32() }
                sstore(/** @src 0:472:473  "0" */ 0x00, /** @src 0:346:625  "contract C {..." */ mload(/** @src 0:469:474  "_s[0]" */ mload(/** @src 0:346:625  "contract C {..." */ add(var_s_mpos, 32))))
                if iszero(lt(1, mload(var_s_mpos))) { panic_error_0x32() }
                let _1 := mload(/** @src 0:489:494  "_s[1]" */ mload(/** @src 0:346:625  "contract C {..." */ add(var_s_mpos, 64)))
                sstore(0x02, _1)
                /// @src 0:500:619  "return (t.y[0], \"longstringlongstringlongstringlongstringlongstringlongstringlongstringlongstringlongstringlongstring\")"
                var := _1
                /// @src 0:346:625  "contract C {..."
                let memPtr := mload(64)
                let newFreePtr := add(memPtr, 160)
                if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { panic_error_0x41() }
                mstore(64, newFreePtr)
                mstore(memPtr, 100)
                mstore(add(memPtr, 32), "longstringlongstringlongstringlo")
                mstore(add(memPtr, 64), "ngstringlongstringlongstringlong")
                mstore(add(memPtr, 96), "stringlongstringlongstringlongst")
                mstore(add(memPtr, 128), "ring")
                /// @src 0:500:619  "return (t.y[0], \"longstringlongstringlongstringlongstringlongstringlongstringlongstringlongstringlongstringlongstring\")"
                var_mpos := memPtr
            }
        }
        data ".metadata" hex"<BYTECODE REMOVED>"
    }
}