Allow alloc_buffer outside SIMT scopes

[and0d0]

允许alloc_buffer声明于simt外，即视为跨simt的buffer
参考 https://github.com/KurrinQu/PTOAS/blob/qkl/ptoas-persistent-simt-fragment-design/docs/designs/ptoas_persistent_simt_fragment_plan.md
开发中

[gemini-code-assist]

Code Review

This pull request removes the restriction that pto.alloc_buffer can only be used inside SIMT subkernels, allowing it to be used in top-level explicit kernels. Documentation and tests are updated to reflect this change. The reviewer pointed out that the error message and docstring for alloc_buffer still contain outdated references to SIMT-only allocations and should be updated for consistency.

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[gemini-code-assist]

由于此 PR 允许在 SIMT 范围之外声明 alloc_buffer（即作为跨 SIMT 的 buffer），第 2334 行的错误提示信息 "It only allocates SIMT local buffers; ..." 已经不再准确。建议将其更新为更通用的描述，例如 "It only allocates local scratch buffers; ..."。

同时，alloc_buffer 的 docstring（第 2323-2329 行）中也提到了 "Allocate SIMT lane-local scratch storage..." 和 "surrounding SIMT helper"，建议一并更新，以保持文档与代码的一致性。

[reedhecre]

Codex Review

该评论由 review 机器人自动更新。

• PR: Allow alloc_buffer outside SIMT scopes #925 Allow alloc_buffer outside SIMT scopes
• Author: and0d0
• Base/Head: main / 486_alloc_buffer_simt_out
• Head SHA: c69ef5cf4000
• Trigger: PR 有新提交
• Generated At: 2026-07-10T04:35:43Z
• Previous Head SHA: 6830b3c8f2ff
• Status: failed at codex-review (exit=1)

Summary

Review failed at stage codex-review: exit=1

Findings

未生成结构化 findings，因为 review 过程提前失败。

Log Tail

set -euo pipefail
rm -rf '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo'
git clone --branch 'main' --depth 50 'https://github.com/hw-native-sys/PTOAS.git' '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo'
cd '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo'
git fetch origin 'refs/pull/925/head:pr-925' --depth 50
git fetch origin 'main' --depth 50 || true
git checkout -f 'pr-925'
git rev-parse HEAD
git diff --stat 'origin/main...HEAD' || true
Cloning into '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo'...
From https://github.com/hw-native-sys/PTOAS
 * [new ref]           refs/pull/925/head -> pr-925
From https://github.com/hw-native-sys/PTOAS
 * branch              main       -> FETCH_HEAD
Switched to branch 'pr-925'
c69ef5cf4000209d8c0e41d678ab5323a529efe2
 ptodsl/docs/user_guide/04-type-system-and-buffer.md |  2 +-
 ptodsl/ptodsl/_ops.py                               | 11 +++++------
 ptodsl/ptodsl/_surface_values.py                    |  2 ++
 ptodsl/tests/test_jit_compile.py                    |  7 ++-----
 4 files changed, 10 insertions(+), 12 deletions(-)
===== END STAGE clone rc=0 @ 2026-07-10 12:35:34 =====

===== STAGE codex-review @ 2026-07-10 12:35:34 =====
set -euo pipefail
cd '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo'
'codex' exec -C '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo' -s read-only -c 'model_provider="codereview"' -c 'model="gpt-5.4"' -c 'model_reasoning_effort="xhigh"' --output-schema '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/review_schema.json' -o '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/codex_last_message.json' --color never - < '/tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/review_prompt.txt'
[monitor] stage timeout: 1800s
OpenAI Codex v0.115.0 (research preview)
--------
workdir: /tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/repo
model: gpt-5.4
provider: codereview
approval: never
sandbox: read-only
reasoning effort: xhigh
reasoning summaries: none
session id: 019f4a4f-3da9-77d0-ab0d-f352f524c64c
--------
user
你现在在审查 GitHub PR。

仓库：hw-native-sys/PTOAS
PR：#925 Allow alloc_buffer outside SIMT scopes
作者：and0d0
base branch：origin/main
head branch：HEAD（当前已 checkout 到 PR head）

要求：
1. 只审查这个 PR 相对 origin/main 的改动，必要时可以看上下文文件。
2. 重点找真实的 correctness / regression / contract mismatch / CI / runtime / compatibility 问题。
3. 不要提纯风格建议，不要提低价值猜测。
4. 严格按优先级输出：
   - P1：高概率会导致错误结果、编译/运行失败、严重回归、发布阻断
   - P2：重要缺陷、行为回归、遗漏校验/测试、较大兼容性问题
   - P3：次要但明确可改的问题
5. 如果没有问题，summary 直接写：未检查到 PR #925 存在问题，并返回 findings=[]。
6. 如果有问题，summary 简洁概括，findings 里每条都要给出：
   - severity
   - title
   - body（说明为什么是问题，尽量具体）
   - file（尽量给相对路径）
   - line（能确定就填整数，否则 null）

建议先查看：
- git status --short
- git diff --stat origin/main...HEAD
- git diff --unified=80 origin/main...HEAD

最终输出必须严格匹配 JSON schema。

mcp startup: no servers
Reconnecting... 1/5 (unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdcd179be9810-LAX, request id: c0932cff-c94e-400a-af5c-fa72b9b78353)
Reconnecting... 2/5 (unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdcd44e3ecb7a-LAX, request id: 5c3ee391-1e68-4659-ab7b-b1cfef15968a)
Reconnecting... 3/5 (unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdcd80b3c91e9-LAX, request id: 6c7ad105-74a8-4208-a1e4-03b0643d40e4)
Reconnecting... 4/5 (unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdcdeb8b834a9-LAS, request id: 1d4fe736-fdee-4c54-adc6-63e5bd654933)
Reconnecting... 5/5 (unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdcea4ee0cb86-LAX, request id: 0d284aa5-55a2-404c-8720-8baf452efaac)
ERROR: unexpected status 403 Forbidden: {"code":"INSUFFICIENT_BALANCE","message":"Insufficient account balance"}, url: https://codex.0u0o.com/responses, cf-ray: a18cdd012ec52378-LAX, request id: b79d17d3-e89b-4f3d-9c66-822d71683464
Warning: no last agent message; wrote empty content to /tmp/ptoas-pr-review-monitor/runs/20260710_123527_pr925/codex_last_message.json
===== END STAGE codex-review rc=1 @ 2026-07-10 12:35:43 =====