Selected stage: loom-lower-for-to-graph. Test exactly output obligation mlir-obligation:037b2351ec38125b2cd5ae56 with its governing context; report any stage at

// Inputs for the Part 3 publication stage (loom-lower-for-to-graph).
// A module holds one or more module-scope `dataflow.thread` definitions, each
// owning exactly one explicit `loom.spatial_region` publication boundary with
// normalized value / stream / memory operand segments and a `graph_name`.
// Region sites appear directly in the thread body, inside a fixed `scf.for`
// schedule, or inside a nested `scf.if` branch site (nested completion
// propagation is supported).  `scf.parallel` / `scf.forall` sites are not
// sampled.  An optional host `func.func` container carries a plain loop that
// owns no spatial region.

start: {new NTHREAD = random.randint(1, 3); new I = 0; new HOST = random.choice([0, 1])}
       'module {\n' host_part thread_list '}\n';

host_part: (HOST == 1) host_func
         | (HOST == 0) '';

host_func: 'func.func @host_container(%target: memref<4xi32>, %value: i32) {\n'
           '  %hz = arith.constant 0 : index\n'
           '  %hf = arith.constant 4 : index\n'
           '  %ho = arith.constant 1 : index\n'
           '  scf.for %hi = %hz to %hf step %ho {\n'
           '    memref.store %value, %target[%hi] : memref<4xi32>\n'
           '  }\n'
           '  return\n'
           '}\n\n';

thread_list: (I < NTHREAD) thread {I += 1} thread_list
           | (I == NTHREAD) '';

tag: [str(I)];

thread: {new SHAPE = random.choice([0, 1, 2]); new KIND = random.choice([0, 1, 2])}
        'dataflow.thread private @thread_' tag
        ' domain(#dataflow.thread_domain<dense>)(%target: memref<1xi32>, %value: i32, %enabled: i1)\n'
        '    ctrl (%ctrl: none) {\n'
        body
        '  dataflow.thread.yield\n'
        '}\n\n';

body: (SHAPE == 0) region_op
    | (SHAPE == 1) for_open region_op for_close
    | (SHAPE == 2) for_open if_open region_op if_close for_close;

for_open: '  %c_zero = arith.constant 0 : index\n'
          '  %c_one = arith.constant 1 : index\n'
          '  %c_trip = arith.constant 4 : index\n'
          '  scf.for %iv = %c_zero to %c_trip step %c_one {\n';

for_close: '  }\n';

if_open: '    scf.if %enabled {\n';

if_close: '    }\n';

region_op: (KIND == 0) region_empty
         | (KIND == 1) region_store
         | (KIND == 2) region_value;

region_empty: '      "loom.spatial_region"()\n'
              '          <{operandSegmentSizes = array<i32: 0, 0, 0, 0>,\n'
              '            resultSegmentSizes = array<i32: 0, 0>}> ({\n'
              '        ^bb0:\n'
              '          "loom.spatial_yield"()\n'
              '              <{operandSegmentSizes = array<i32: 0, 0>}> : () -> ()\n'
              '      }) {graph_name = "graph_' tag '", source_maps = []} : () -> ()\n';

region_store: '      "loom.spatial_region"(%value, %target)\n'
              '          <{operandSegmentSizes = array<i32: 1, 0, 1, 0>,\n'
              '            resultSegmentSizes = array<i32: 0, 0>}> ({\n'
              '        ^bb0(%payload: i32, %memory: memref<1xi32>):\n'
              '          %zero = arith.constant 0 : index\n'
              '          memref.store %payload, %memory[%zero] : memref<1xi32>\n'
              '          "loom.spatial_yield"()\n'
              '              <{operandSegmentSizes = array<i32: 0, 0>}> : () -> ()\n'
              '      }) {graph_name = "graph_' tag '", source_maps = []} : (i32, memref<1xi32>) -> ()\n';

region_value: '      %region_out = "loom.spatial_region"(%value)\n'
              '          <{operandSegmentSizes = array<i32: 1, 0, 0, 0>,\n'
              '            resultSegmentSizes = array<i32: 1, 0>}> ({\n'
              '        ^bb0(%payload: i32):\n'
              '          %doubled = arith.addi %payload, %payload : i32\n'
              '          "loom.spatial_yield"(%doubled)\n'
              '              <{operandSegmentSizes = array<i32: 1, 0>}> : (i32) -> ()\n'
              '      }) {graph_name = "graph_' tag '", source_maps = []} : (i32) -> i32\n';