[ { "api_error_status": null, "duration_api_ms": 40454, "duration_ms": 40499, "fast_mode_disabled_reason": "sdk_opt_in_required", "fast_mode_state": "off", "first_content_frame_ms": 1536, "is_error": false, "modelUsage": { "claude-opus-5": { "cacheCreationInputTokens": 4984, "cacheReadInputTokens": 0, "canonicalModel": "claude-opus-5", "contextWindow": 1000000, "costBasis": "list", "costUSD": 0.129375, "inputTokens": 2, "maxOutputTokens": 64000, "outputTokens": 3181, "provider": "firstParty", "thinkingTokens": 176, "webSearchRequests": 0 } }, "num_turns": 1, "permission_denials": [], "queued_turn_count": 0, "result": "## Preconditions\n\n1. Every emitted program is a single MLIR module whose `module attributes` carry both `llvm.data_layout = \"e-p:64:64\"` and a `dlti.dl_spec` declaring exactly one entry, `#dlti.dl_entry`, so an index width is always declared at module scope.\n2. The module contains exactly one operation, a `dataflow.graph` named `@source_memory_graph` with `private` visibility.\n3. The graph's signature is fixed at six block arguments in this order and with these types: `%start: none`, `%base: !llvm.ptr`, `%expected: i32`, `%desired: i32`, `%index: i64`, `%cond: i1`, and it returns `()`.\n4. The leading graph argument is always the `none`-typed execution value `%start`, and the graph body always terminates with `dataflow.graph.return %start : none`, so the execution token entering the graph is the one returned.\n5. The graph carries the attributes `input_segments = array` and `result_segments = array`, i.e. five non-execution inputs and no results, consistent with the six-argument/zero-result signature.\n6. The first body operation is always a pointer computation, `llvm.getelementptr inbounds %base[%index] : (!llvm.ptr, i64) -> !llvm.ptr, !llvm.array<4 x i8>`, producing `%ptr`.\n7. Every memory leaf in the body addresses that single derived pointer `%ptr`; no leaf addresses `%base` or any other pointer, and no additional pointer is ever computed.\n8. Every value an operation consumes is either a graph block argument (`%desired`, `%expected`, `%index`, `%base`, `%cond`, `%start`) or `%ptr`; loaded values, `atomicrmw` results and `cmpxchg` results are never consumed by any later operation.\n9. The data type of every memory access is `i32`, and the GEP index type is `i64`, matching the declared 64-bit index width.\n10. The body's memory leaves are drawn only from the residual LLVM memory set: `llvm.load` (plain, volatile, atomic), `llvm.store` (plain, volatile, atomic), `llvm.atomicrmw`, `llvm.cmpxchg`, and `llvm.fence`; no other LLVM operation and no non-memory computation appear among the leaves.\n11. Every operation with an atomic contract \u2014 atomic load, atomic store, `atomicrmw`, `cmpxchg` \u2014 and every volatile load or volatile store carries an explicit `{alignment = N : i64}` attribute whose value is a power of two.\n12. Plain (non-volatile, non-atomic) loads and stores carry no alignment attribute, and `llvm.fence` carries neither an alignment attribute nor an operand.\n13. Memory orderings are constrained per operation class: atomic loads use only load-legal orderings, atomic stores only store-legal orderings, `atomicrmw` and the success ordering of `cmpxchg` any read-modify-write ordering, the failure ordering of `cmpxchg` a load-legal ordering, and fences only orderings stronger than `monotonic`; `unordered` and a bare `monotonic` fence never appear.\n14. A `cmpxchg` always supplies both a comparison value `%expected` and a new value `%desired`, and always states two orderings (success then failure) in that order.\n15. Every synchronization scope, when present, is one of the two scopes with a compiler-target owner \u2014 `syncscope(\"singlethread\")` or `syncscope(\"system\")` \u2014 or is absent (the implicit default); target-specific scope names are excluded from the input domain.\n16. All result names are unique within the graph: load results are `%val`, `atomicrmw` results `%rmw`, and `cmpxchg` results `%pair`, where `` is the leaf's position index in the body.\n17. The memory leaves either sit directly in the graph body or are all nested inside exactly one structured control-flow region; the leaves are never split across a region boundary and regions are never nested inside one another.\n18. When a structured region is used it is either an `scf.if %cond { ... }` guarded by the `i1` block argument, with no `else` branch and no results, or an `scf.for` loop with no iteration arguments and no results.\n19. When the `scf.for` form is used, its three bounds are `index`-typed `arith.constant` operations defined immediately before the loop, and the loop induction variable `%iv` is never used by any leaf inside the body.\n20. Both region forms are terminator-implicit (no explicit `scf.yield` is written), and the region is always closed before the graph's `dataflow.graph.return`.\n21. The graph body always contains at least one memory leaf.\n\n## Sampling conventions\n\n1. The number of memory leaves is sampled uniformly from 1 to 6 inclusive; no empty body and no body larger than six leaves is emitted.\n2. The body shape is chosen from exactly three options \u2014 flat sequential composition, one `scf.if`, one `scf.for` \u2014 with the flat form listed twice so it is weighted more heavily, and no other structured construct (e.g. `scf.while`, nested regions, `else` branch) is ever produced.\n3. All leaves are emitted by one right-recursive list rule counted by a state variable `I` against the sampled `COUNT`, so leaf positions are consecutive integers starting at 0.\n4. The result-name suffix `` is exactly the current loop counter `I` rendered with `str`, so names run `%val0`, `%rmw1`, `%pair2`, \u2026 following the leaf's position rather than a separate counter per operation kind.\n5. Each leaf is independently chosen from a fixed nine-way menu: plain load, volatile load, atomic load, plain store, volatile store, atomic store, `atomicrmw`, `cmpxchg`, fence.\n6. The `cmpxchg` alternative is guarded so it is only admissible in the flat (non-region) shape; inside `scf.if` or `scf.for` bodies the grammar samples only the other eight leaf kinds.\n7. Alignment values are drawn from the two-element set `{4, 8}` only, always printed as `alignment = N : i64`.\n8. Synchronization scope is sampled from three alternatives \u2014 empty string, `syncscope(\"singlethread\")`, `syncscope(\"system\")` \u2014 and is offered on atomic loads, atomic stores, `atomicrmw`, `cmpxchg` and `fence`, but never on plain or volatile accesses.\n9. Atomic-load ordering is sampled from `monotonic`, `acquire`, `seq_cst`; atomic-store ordering from `monotonic`, `release`, `seq_cst`; read-modify-write ordering from `monotonic`, `acquire`, `release`, `acq_rel`, `seq_cst`; fence ordering from `acquire`, `release`, `acq_rel`, `seq_cst`.\n10. For `cmpxchg`, the grammar reuses the read-modify-write ordering set for the success ordering and the load ordering set for the failure ordering, and it does not restrict the failure ordering relative to the success ordering.\n11. A `volatile` marker is sampled independently for `cmpxchg` only (empty or `volatile `); loads and stores instead get volatility by selecting the dedicated volatile alternatives, and `atomicrmw` and `fence` are never marked volatile.\n12. The `atomicrmw` operation kind is drawn from a ten-element list emitted literally as `xchg`, `add`, `sub`, `_and`, `_or`, `_xor`, `max`, `min`, `umax`, `umin` \u2014 the bitwise kinds carrying a leading underscore in the emitted text \u2014 and floating-point, `nand`, and pointer-oriented kinds are excluded.\n13. Values `%expected`, `%index`, `%cond` are emitted in the signature in every program regardless of whether any sampled leaf uses them, so unused block arguments are common.\n14. The module preamble, graph signature, attribute dictionaries and the `getelementptr` line are fixed constant text, with the GEP element type pinned to `!llvm.array<4 x i8>` and the loop trip count pinned to `0` to `4` step `1`.\n15. All body lines are emitted with a fixed four-space indentation, including operations nested inside the `scf.if`/`scf.for` regions, which therefore are not indented further than their enclosing region header.\n16. Names are fixed literals (`@source_memory_graph`, `%start`, `%base`, `%expected`, `%desired`, `%index`, `%cond`, `%ptr`, `%lower`, `%upper`, `%step`, `%iv`), so no name is randomly generated and no uniqueness postcondition is needed.\n17. 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