build: upgrade PTOAS to LLVM 21.1.8#796
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Code Review
This pull request upgrades the project's LLVM/MLIR dependency from version 19.1.7 to 21.1.8, updating the build configurations, Dockerfiles, documentation, and Python bindings (including adding nanobind) accordingly. It also adapts the C++ codebase to LLVM 21 API changes, such as using getStridesAndOffset as a member function of MemRefType and replacing applyPatternsAndFoldGreedily with applyPatternsGreedily. The review feedback correctly points out that PointerUnion::dyn_cast is deprecated and removed in LLVM 21, suggesting the use of ofr.get<Value>() instead of ofr.dyn_cast<Value>() in InferPTOLayout.cpp and PTOToEmitC.cpp where the underlying type has already been verified.
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| return std::nullopt; | ||
| } | ||
| return getConstInt(ofr.get<Value>()); | ||
| return getConstInt(ofr.dyn_cast<Value>()); |
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In LLVM 21, the PointerUnion::dyn_cast member function is deprecated and removed. Since we have already verified that ofr is not an Attribute using ofr.is<Attribute>(), we can safely use ofr.get<Value>() directly. This avoids deprecation warnings and is more efficient.
| return getConstInt(ofr.dyn_cast<Value>()); | |
| return getConstInt(ofr.get<Value>()); |
| return intAttr.getInt(); | ||
| } else { | ||
| Value v = ofr.get<Value>(); | ||
| Value v = ofr.dyn_cast<Value>(); |
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In LLVM 21, the PointerUnion::dyn_cast member function is deprecated and removed. Since we have already verified that ofr is not an Attribute using ofr.is<Attribute>(), we can safely use ofr.get<Value>() directly. This avoids deprecation warnings and is more efficient.
| Value v = ofr.dyn_cast<Value>(); | |
| Value v = ofr.get<Value>(); |
Codex Review该评论由 review 机器人自动更新。
SummaryReview failed at stage Findings未生成结构化 findings，因为 review 过程提前失败。 Log Tail |
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LLVM21 follow-up pushed in 413a0cf.\n\nWhat changed:\n- Replaced remaining removed LLVM21 float8 member predicates with PTO low-precision type helpers.\n- Removed obsolete LLVM dialect low-precision/fixed-vector type names from VPTO emitters.\n- Lowered low-precision VPTO vreg payloads through the i8 carrier ABI to avoid LLVM21-invalid f8/i8 vector bitcasts.\n\nLocal validation:\n- cmake --build build-llvm21 --target ptoas ptobc _pto\n- cmake --build build-llvm21 --target install\n- ctest --test-dir build-llvm21 --output-on-failure: 27/27 passed\n- Python smoke: import mlir.ir; from mlir.dialects import pto\n- llvm-lit build-llvm21/test/lit/vpto: 241/241 passed\n- bash test/samples/runop.sh --enablebc all: OK=265 FAIL=0 SKIP=16\n\nA3/A5 simulator and wheel checks are left to CI/self-hosted runners because this local machine does not have the required Ascend simulator/toolchain environment. |
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/run A3 |
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已接收
页面会自动刷新，可以直接看当前阶段、排队情况和最近结果。 |
A3 板测失败
日志尾部 |
A3 board test failure triageThe manual
Failure excerpt: Root cause: the A3 board-test build environment is using an older MLIR/LLVM API where Therefore this is an A3 build environment dependency mismatch, not a hardware testcase failure and not a runtime mismatch in A3 kernels. The board-test runner needs to rebuild/use the same LLVM dependency as the PR: After clearing the stale board-test LLVM/PTOAS build cache and rebuilding with that LLVM21 VPTO dependency, |
A3 board rerun with LLVM21 VPTO dependencyI reran the A3 validation manually on Environment:
Passed checks:
Additional A3 runtime signal:
Still failing:
Failure signatures:
Conclusion:
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mouliangyu
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mouliangyu
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看起来关于 vpto 的修改有很多功能变动，能否解释一下
| python3 -m pip install 'pybind11<3' nanobind numpy ml-dtypes | ||
| fi | ||
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| if [[ -x /usr/bin/cc ]]; then |
| PTOAS_BIN="${PTOAS_BIN}" \ | ||
| DEVICE=SIM \ | ||
| JOBS="${JOBS:-32}" \ | ||
| VPTO_SIM_ENABLE_KNOWN_UNSUPPORTED_SKIP=1 \ |
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| add_custom_command(TARGET _pto POST_BUILD | ||
| COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_BINARY_DIR}/python/mlir/dialects" | ||
| set(PTO_PY_BUILD_DIR "${CMAKE_BINARY_DIR}/python/mlir/dialects") |
| return LLVM::LLVMFloat8E4M3Type::get(context); | ||
| if (type.isFloat8E5M2() || type.isFloat8E5M2FNUZ()) | ||
| return LLVM::LLVMFloat8E5M2Type::get(context); | ||
| if (pto::isPTOHiFloat8Type(type) || isa<pto::F4E1M2x2Type>(type) || |
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这个文件为何看起来不像是在做 llvm 兼容性修改，而是做了一些功能点的修改
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| static bool hasVPTOConvertibleType(Type type) { | ||
| return isa<pto::VRegType, pto::MaskType, pto::AlignType, pto::PtrType>(type); | ||
| if (isa<pto::VRegType, pto::MaskType, pto::AlignType, pto::PtrType>(type)) |
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这个文件看起来不像是兼容性修改，而是一些低精度的功能修改，为啥
| continue; | ||
| if (call->getCallingConv() == llvm::CallingConv::SimtEntry) | ||
| auto *callee = call->getCalledFunction(); | ||
| if (callee && simtConfigByName.contains(callee->getName())) |
| @@ -0,0 +1,28 @@ | |||
| # Copyright (c) 2026 Huawei Technologies Co., Ltd. | |||
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我理解不应该有这个 unsupported list
| const mlir::pto::PTOASCompileResult &jobResult, PTOASContext &context, | ||
| llvm::StringRef moduleId, llvm::StringRef outputPath); | ||
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| static LogicalResult emitSingleVPTOLLVMIR( |
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这个选项看起来像是功能变更而不是 llvm 适配
| } | ||
| } | ||
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| static std::optional<size_t> findVectorTypeStart(StringRef text, |
| llvm::cl::desc("Write final post-pass VPTO IR to -o"), | ||
| llvm::cl::init(false)); | ||
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| llvm::cl::opt<bool> mlir::pto::emitVPTOLLVMIR( |
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这个选项不应该保留，看起来像是调试阶段的临时修改，如需添加，建议另起 pr
A3 board rerun update: full board-monitor-style payloadCorrection to the narrower direct I reproduced that fuller flow manually with the LLVM21 VPTO build:
Major failing groups:
Skipped cases:
Useful positive signals from the full run:
So the correct A3 full-payload status is not the earlier narrow |
A3 full-payload rerun after PTO entry compatibility fixPushed Local / host validation on this SHA:
A3 rerun with LLVM21 VPTO dependency:
Compared with the previous full-payload rerun ( Remaining A3 failures are limited to
So the entry/codegen regression is addressed by One more note: GitHub currently reports this PR as |
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@mouliangyu 补充说明一下 VPTO 这一块为什么改动看起来比较多。 这部分不是在 LLVM21 升级里新增 VPTO 功能目标，主要是为了让现有 VPTO lowering 在 LLVM21 + VPTO 自定义 LLVM 分支下继续通过 LLVM IR export、Bisheng/CANN SIM 和后续上板构建。大改动集中在几个兼容性点：
当前验证状态：
A3 状态在上一个评论里已经单独说明：恢复 PTO entry 兼容行为后，完整 payload 从 OK=164/FAIL=82 恢复到 OK=235/FAIL=11/SKIP=6；剩余失败集中在 Qwen3DecodeA5 的 layout/numeric contract，不是旧 LLVM cache 或 entry codegen 问题。 |
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Follow-up: reverted invalid Qwen3DecodeA5 layout editsPushed What was reverted:
Why:
Local validation after the revert:
Expected A3 impact:
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Update: reverted the unsafe left-tile layout normalization that was masking the Qwen3DecodeA5 board failure. What changed in
Local validation:
I will rerun the targeted A3 queue validation for Qwen3DecodeA5 and post the result once it finishes. |
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已按 review 意见回退不合理改动，并推到最新 head f984442。 回退内容：
关于 LLVM 依赖分支：我重新确认了 vpto-dev/llvm-project:feature-vpto，当前远端 SHA 为 fa2fd1f，包含 fp8/fp4 textual IR 和 simt_entry cc patch，但版本基线仍是 LLVM 19.1.7（cmake/Modules/LLVMVersion.cmake 中 LLVM_VERSION_MAJOR=19）。因此这个 PR 不能直接把 LLVM21 CI 依赖切回该分支，否则会退回 LLVM19。当前仍保留 LLVM21 VPTO 依赖分支；PTOAS 侧已经撤掉为绕开缺失 LLVM patch 而写的临时方案。 本地验证：
CI 已在最新 head 重新触发，继续跟踪结果。 |
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CI follow-up for head
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CI status update for head
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我整理了一个 draft PR 用来检视 LLVM21 升级中 VPTO 修改最小化后的效果：
主要修改点：
本地验证结果：
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已吸收评论区提供的 patch（TaoTao-real#5），并推到最新 head 本次按 review 意见进一步收敛 LLVM21 VPTO 适配范围：
本地验证：
说明：全量 runop 统计里多出的 1 个 OK 来自本地未跟踪临时目录 |
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Summary
TaoTao-real/llvm-project:feature-vpto-llvm21, which forward-ports the VPTO adaptations fromvpto-dev/llvm-project:feature-vptoontollvmorg-21.1.8.nanobindfor LLVM21 MLIR Python builds while keeping PTOAS Python bindings onpybind11+PybindAdaptors._ptoundermlir/_mlir_libs,pto.pyand_pto_ops_gen.pyundermlir/dialects.Motivation
llvmorg-21.1.8.vpto-dev/llvm-project:feature-vptois based on LLVM 19.1.7, so PTOAS cannot depend on it directly after the LLVM21 upgrade. This PR uses an LLVM21 forward-port branch instead.Design
TaoTao-real/llvm-project:feature-vpto-llvm21.llvmorg-21.1.8/2078da43e25a4623cab2d0d60decddf709aaea28.4a7a793a0665 feat: forward-port VPTO LLVM support to 21.1.8.simt_entry, backend-only low-precision MVTs, low-precision LLVM IR/MLIR LLVM dialect import/export, and textual parser support for VPTO low-precision type keywords._ptovia pybind11;nanobindis only added because LLVM21 MLIR Python bindings need it.Python3_EXECUTABLEinstead of assumingpythonexists on PATH.Testing
llvm-as,llvm-dis,mlir-translate, and CodeGen smoke passed in the LLVM branch.cmake --build build-llvm21 --target ptoas ptobcpassed.cmake --build build-llvm21 --target PTOPythonModulespassed.cmake --build build-llvm21 --target install --parallel 8passed.llvm-lit -sv build-llvm21/test/lit, 602/602 passed.cmake --build build-llvm21 --target check-ctest --parallel 8, 27/27 passed.import mlir.ir; from mlir.dialects import pto; pto.register_dialect(ctx)passed.runop.sh --enablebc -t Abs,-t MatMul, and-t Syncpassed.bash test/samples/runop.sh --enablebc all, OK=265 FAIL=0 SKIP=19.Risk / Rollback
TaoTao-real/llvm-project; pushing the branch tovpto-dev/llvm-projectneeds upstream LLVM repo write access.Review Focus
from mlir.dialects import pto.