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herhut (Stephan Herhut)
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User Since
Jan 7 2020, 7:38 AM (194 w, 3 d)

Recent Activity

Mon, Sep 4

herhut accepted D159422: [mlir][GPU] Lower arith.remf to GPU intrinsic..

Thank you for adding this.

Mon, Sep 4, 4:26 AM · Restricted Project, Restricted Project

Aug 25 2023

herhut added a comment to D158847: [mlir][nvgpu] remove duplicated pattern (nfc).

Thank you!

Aug 25 2023, 8:19 AM · Restricted Project, Restricted Project

Aug 18 2023

herhut accepted D158175: [mlir][GPU][NFC] Remove type converter hack.
Aug 18 2023, 12:54 AM · Restricted Project, Restricted Project

Aug 14 2023

herhut abandoned D157742: [bazel] Remove superfluous (?) strip_include_prefix settings..

I wanted to use presubmit bots to test this. This was now landed independently.

Aug 14 2023, 4:21 AM · Restricted Project, Restricted Project

Aug 11 2023

herhut requested review of D157742: [bazel] Remove superfluous (?) strip_include_prefix settings..
Aug 11 2023, 11:24 AM · Restricted Project, Restricted Project

Apr 18 2023

herhut committed rG6a10381b6f12: [mlir][llvm] Fix for MemRefBuilder when using opaque pointers. (authored by herhut).
[mlir][llvm] Fix for MemRefBuilder when using opaque pointers.
Apr 18 2023, 1:02 AM · Restricted Project, Restricted Project
herhut closed D148540: Summary: Fix for MemRefBuilder when using opaque pointers..
Apr 18 2023, 1:02 AM · Restricted Project, Restricted Project

Apr 17 2023

herhut requested review of D148540: Summary: Fix for MemRefBuilder when using opaque pointers..
Apr 17 2023, 9:32 AM · Restricted Project, Restricted Project

Mar 22 2023

herhut accepted D146558: [mlir] Add a pattern to fold tensor.cast into scf.forall..

Just some minor nits.

Mar 22 2023, 2:48 AM · Restricted Project, Restricted Project

Mar 21 2023

herhut accepted D145368: [mlir] Add a pattern to fold single- and zero-iteration scf.forall ops..

Looks good conditional on small nits.

Mar 21 2023, 12:58 AM · Restricted Project, Restricted Project

Jan 26 2023

herhut added a comment to D141804: [mlir][linalg] Omit printing result types for named ops..

Than you @powderluv for describing your usecase. I was not aware that linalg is used as a storage/transit format.

Jan 26 2023, 5:01 AM · Restricted Project, Restricted Project

Jan 16 2023

herhut accepted D141804: [mlir][linalg] Omit printing result types for named ops..

I am in favor of landing this (but please ensure consensus before doing so). I have argued against changes before that were purely aesthetic but introduced a lot of churn (like the one in https://reviews.llvm.org/D133076). Ultimately it is a subjective decision. I have a different opinion in this case because the linalg dialect has a smaller usage scope compared to arith, so I am willing to accept more churn. Also, this change improves ergonomics when reading linalg IR, which we increasingly do and hence care about. This was also one of the motivations to introduce new operations to linalg like map.

Jan 16 2023, 1:26 PM · Restricted Project, Restricted Project

Jan 11 2023

herhut accepted D141505: Lower math.tan to __nv_tan[f] / __ocml_tan_f{32|64}.

Thanks for adding this.

Jan 11 2023, 8:46 AM · Restricted Project, Restricted Project

Jan 5 2023

herhut added a comment to D141049: [mlir][nvvm] Add lowering of gpu.printf to nvvm.

Nice. Just some comments.

Jan 5 2023, 9:55 AM · Restricted Project, Restricted Project

Jan 3 2023

herhut updated subscribers of D140846: [NVPTX] Fix NVPTX lowering of frem when denominator is infinite..

This looks reasonable to me but @tra or @bkramer would be better reviewers.

Jan 3 2023, 8:46 AM · Restricted Project, Restricted Project

Nov 7 2022

herhut added a comment to D137413: [mlir] Introduce device mapper attribute for `thread_dim_map` and `mapped to dims`.

I agree that this goes in the right direction, however, I am unsure what this direction is? Is there a writeup of where this should be going? That would make reviewing these changes easier.

Nov 7 2022, 5:58 AM · Restricted Project, Restricted Project

Nov 2 2022

herhut accepted D136586: [mlir][linalg] Add reduction tiling transformation.

Thanks for refactoring. Having this in a separate interface addresses my concerns about the partial interface. Did not look at the deep details but also do not want to block this.

Nov 2 2022, 10:00 AM · Restricted Project, Restricted Project

Oct 27 2022

herhut accepted D136345: [mlir][gpu] Unroll ops on vectors which map to intrinsic calls.
Oct 27 2022, 11:58 AM · Restricted Project, Restricted Project

Oct 26 2022

herhut requested changes to D136586: [mlir][linalg] Add reduction tiling transformation.
Oct 26 2022, 4:27 AM · Restricted Project, Restricted Project

Oct 20 2022

herhut accepted D136327: [mlir][nfc] Clean-up usage of kDynamicSize..

Thanks!

Oct 20 2022, 5:33 AM · Restricted Project, Restricted Project, Restricted Project
herhut added a comment to D136327: [mlir][nfc] Clean-up usage of kDynamicSize..

Thanks for doing this. The patch looks correct to me.

Oct 20 2022, 3:22 AM · Restricted Project, Restricted Project, Restricted Project

Sep 19 2022

herhut accepted D134153: Add a create function for mlir::SerializeToCubinPass.

Not sure about the defaults but looks good otherwise. Also +1 to @bondhugula comments. Please address those first.

Sep 19 2022, 7:54 AM · Restricted Project, Restricted Project
herhut added a comment to D133911: [mlir] Allow memref.cast to change the signed/unsigned/signless element type.

gpu.memset operations expects both arguments to have the same type:

%0 = arith.constant 0 : ui32
%1 = memef:alloca: memref<ui32>
gpu.memset %1, %0 : memref<ui32>, ui32
Sep 19 2022, 7:50 AM · Restricted Project, Restricted Project

Sep 15 2022

herhut added a comment to D133911: [mlir] Allow memref.cast to change the signed/unsigned/signless element type.

Can you explain why this is needed? In usecases I have seen, the entire IR typically transitions from signed to signless types but I have not seen the need for a mixed form, yet.

Sep 15 2022, 7:08 AM · Restricted Project, Restricted Project
herhut accepted D133904: [mlir] Add gpu.memzero operation.
Sep 15 2022, 7:02 AM · Restricted Project, Restricted Project

Sep 13 2022

herhut accepted D133409: [MLIR] Remove unused lit test replacements..
Sep 13 2022, 8:30 AM · Restricted Project, Restricted Project

Sep 6 2022

herhut accepted D133270: [MLIR] Switch lit tests to %mlir_lib_dir and %mlir_src_dir replacements..

Thanks for the explanation. My bazil-foo is not as strong as yours.

Sep 6 2022, 1:02 AM · Restricted Project, Restricted Project

Sep 5 2022

herhut added a comment to D133270: [MLIR] Switch lit tests to %mlir_lib_dir and %mlir_src_dir replacements..

+1 for the direction. Just a bazil question.

Sep 5 2022, 1:38 AM · Restricted Project, Restricted Project

Sep 2 2022

herhut added a comment to D133076: [mlir][arith] Change the syntax of `arith.cmpi/f`.

I am going to go against the majority opinion here and say the syntax should just stay as it is. Most operations don't have their operands in parentheses and have their mandatory attributes as keywords. Introducing a less common syntax breaks the reading flow and unnecessarily anchors attention. The only reason why I think the current syntax may give the impression of the predicate being an operand is the comma between the predicate and the operand: arith.cmpi eq, %a, %b as opposed to arith.cmpi eq %a, %b. I also think that even rudimentary familiarity with the IR structure is sufficient to understand that the predicate is not in fact an operand: operands are values, and values are always prefixed with a % sign.

Yeah, now that you mention it, it really is just the comma. I kind of like your suggestion better.

On the other hand, the amount of churn required to essentially remove a comma is scary. For me, it's not worth it.

I understand where you're coming from ( ;) ). I may be alone in this opinion, but I'm not comfortable with the idea that we shouldn't do things just because of churn. Over a comma (and a few braces), however, I'm willing to relent.

Sep 2 2022, 3:19 AM · Restricted Project, Restricted Project, Restricted Project
herhut accepted D132726: [MLIR] Remove unused config attributes from lit.site.cfg.py.

Thanks!

Sep 2 2022, 12:49 AM · Restricted Project, Restricted Project

Aug 23 2022

herhut added a comment to D132460: buffer-deallocation: consider aliases introduced by arith.select..

I find it very strange that arith.select supports memref in the first place. Are there other operations in the arith dialect that do this?

Aug 23 2022, 8:24 AM · Restricted Project, Restricted Project

Aug 4 2022

herhut added a comment to D131053: [mlir] Extract offsets-sizes-strides computation from `makeTiledShape(s)`..

What this does is reducing coupling between tiling linalg operations and the specific way the tiling is expressed in IR. It is true that this enables out-of-tree uses but MLIR is an infrastructure, so enabling out of tree uses should be a goal. There is no inherent reason why tiling a linalg operation should depend on using tensor operations.

I think a usage/API that is driven by a particular use of MLIR out-of-tree would become hard to maintain. I am looking for a more flushed out description of how any out-of-tree user is expected to use it (and thereby concretize the usage that is driving these changes).

Aug 4 2022, 1:31 AM · Restricted Project, Restricted Project

Aug 3 2022

herhut added a comment to D131053: [mlir] Extract offsets-sizes-strides computation from `makeTiledShape(s)`..

This is increasing the API surface area of Tiling transformation, when in reality we need to be going the other way, reducing the API surface area.

Aug 3 2022, 12:44 PM · Restricted Project, Restricted Project
herhut accepted D131053: [mlir] Extract offsets-sizes-strides computation from `makeTiledShape(s)`..

Can you provide some rationale for this change in the description? I assume this enables reuse of the functionality independent of extract_slice and friends but making this clear in the description would be nice.

Aug 3 2022, 8:10 AM · Restricted Project, Restricted Project

Aug 2 2022

herhut committed rG09ca1c065621: [mlir] Use EXPECT_DEBUG_DEATH in unit test (authored by herhut).
[mlir] Use EXPECT_DEBUG_DEATH in unit test
Aug 2 2022, 2:17 AM · Restricted Project, Restricted Project

Aug 1 2022

herhut committed rG0e5ac92ce2ad: [mlir][bazel] Fix bazel build files (authored by herhut).
[mlir][bazel] Fix bazel build files
Aug 1 2022, 3:06 AM · Restricted Project
herhut closed D130890: [mlir][bazel] Fix bazel build files.
Aug 1 2022, 3:06 AM · Restricted Project, Restricted Project
herhut accepted D130890: [mlir][bazel] Fix bazel build files.
Aug 1 2022, 2:57 AM · Restricted Project, Restricted Project
herhut requested review of D130890: [mlir][bazel] Fix bazel build files.
Aug 1 2022, 2:40 AM · Restricted Project, Restricted Project

Jul 7 2022

herhut accepted D129228: [mlir][AMDGPU] Add --chipset option to AMDGPUToROCDL.
Jul 7 2022, 3:13 AM · Restricted Project, Restricted Project

Jul 4 2022

herhut added a comment to D129036: [mlir] Add InferIntRangeInterface to gpu.launch.

As a follow-up, how about adding an attribute next to gpu.kernel that encodes the launch bounds?
They can be used to provide ranges to gpu.block_id etc and can be lowered to e.g.:
https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#performance-tuning-directives

Jul 4 2022, 5:44 AM · Restricted Project, Restricted Project

May 31 2022

herhut added a comment to D126310: Do not destroy attrs in MergeNestedParallelLoops.

I don't think there are any guarantees that MLIR preserves unknown attributes during canonicalization. So this would be the first precedent in that direction.

May 31 2022, 3:52 AM · Restricted Project, Restricted Project
herhut accepted D126158: [MLIR][GPU] Replace fdiv on fp16 with promoted (fp32) multiplication with reciprocal plus one (conditional) Newton iteration..

Separate pass works for me.

May 31 2022, 1:42 AM · Restricted Project, Restricted Project, Restricted Project, Restricted Project

May 25 2022

herhut added inline comments to D126158: [MLIR][GPU] Replace fdiv on fp16 with promoted (fp32) multiplication with reciprocal plus one (conditional) Newton iteration..
May 25 2022, 8:26 AM · Restricted Project, Restricted Project, Restricted Project, Restricted Project
herhut accepted D126199: [MLIR][GPU] Expose GpuParallelLoopMapping as non-test pass..

If it useful beyond testing, I don't see why it should not be a regular pass.

May 25 2022, 8:18 AM · Restricted Project, Restricted Project
Herald added a project to D102799: [mlir][SCF] Canonicalize nested ParallelOps's: Restricted Project.

What was the motivation behind this canonicalization? In particular, why would a combined parallel loop be considered the canonical form?

May 25 2022, 7:15 AM · Restricted Project, Restricted Project

Apr 28 2022

herhut accepted D124577: [mlir] Don't iterate mutable user list.

Thanks!

Apr 28 2022, 2:51 AM · Restricted Project, Restricted Project
herhut accepted D124533: [mlir][NvGpu] Fix nvgpu.mma.sync lowering to NVVM for f32, tf32 types.

Thanks. Adding @csigg as an FYI.

Apr 28 2022, 2:50 AM · Restricted Project, Restricted Project

Apr 27 2022

herhut committed rGc10bbc20bc4d: [mlir][bazel] Add suport for PDLL tests. (authored by herhut).
[mlir][bazel] Add suport for PDLL tests.
Apr 27 2022, 3:35 AM · Restricted Project
herhut closed D124515: [mlir][bazel] Add suport for PDLL tests..
Apr 27 2022, 3:35 AM · Restricted Project, Restricted Project
herhut added a reviewer for D124515: [mlir][bazel] Add suport for PDLL tests.: akuegel.
Apr 27 2022, 3:30 AM · Restricted Project, Restricted Project
herhut requested review of D124515: [mlir][bazel] Add suport for PDLL tests..
Apr 27 2022, 3:12 AM · Restricted Project, Restricted Project

Apr 25 2022

herhut added a comment to D124366: [mlir][vector] insert `alloca`s outside of loops.

What is the longer term plan here? Do all places that introduce alloca have to perform this local optimization? Should we instead have a pass that hoists alloca out of loops? Or rethink the introduction of allocation scope for loops?

Apr 25 2022, 5:17 AM · Restricted Project, Restricted Project

Apr 19 2022

herhut accepted D123568: Add RegionBranchOpInterface on affine.for op.

Thanks!

Apr 19 2022, 4:25 AM · Restricted Project, Restricted Project

Apr 13 2022

herhut accepted D123266: [mlir][nvgpu] Add NVGPU dialect (architectural specific gpu dialect).

Looks good to me. We really need to figure out a way to group dialects :)

Apr 13 2022, 8:32 AM · Restricted Project, Restricted Project

Apr 12 2022

herhut added a comment to D123568: Add RegionBranchOpInterface on affine.for op.

Thanks for adding this.

Apr 12 2022, 2:21 AM · Restricted Project, Restricted Project

Mar 21 2022

herhut accepted D122066: [mlir] Add a function to print C-strings to RunnerUtils.cpp..
Mar 21 2022, 2:26 AM · Restricted Project, Restricted Project

Feb 18 2022

herhut committed rGa43f7d6d7698: [mlir][tensor] Extend reshape utils. (authored by herhut).
[mlir][tensor] Extend reshape utils.
Feb 18 2022, 12:58 AM
herhut closed D119730: [mlir][tensor] Extend reshape utils..
Feb 18 2022, 12:58 AM · Restricted Project

Feb 17 2022

herhut added a comment to D120046: [buildbot][cuda] Update used CUDA version to 11.6..

Found the testing. I need to get my docker setup in order before I can test, so this will take a little to land.

Feb 17 2022, 7:47 AM
herhut accepted D120021: Rename PatternRewriteSet::insert to add.

Thanks!

Feb 17 2022, 7:45 AM · Restricted Project
herhut added a reviewer for D120046: [buildbot][cuda] Update used CUDA version to 11.6.: tra.

Is there a way to test these configurations before submitting them?

Feb 17 2022, 5:20 AM
herhut requested review of D120046: [buildbot][cuda] Update used CUDA version to 11.6..
Feb 17 2022, 5:15 AM
herhut accepted D120044: [BufferDeallocation] Don't assume successor operands are unique.

Thanks!

Feb 17 2022, 5:15 AM · Restricted Project
herhut added a comment to D119730: [mlir][tensor] Extend reshape utils..

I have always felt this method to be a bit ad-hoc. I wanted to replace this with the logic in this patch https://reviews.llvm.org/D119904 (at line 792 in LinalgOps.cpp). That logic is better defined and easier to follow I think. If you could adapt this to use that approach, that'd be great.

Feb 17 2022, 4:37 AM · Restricted Project

Feb 16 2022

herhut accepted D119938: [mlir][MemRef] Lower memref.copy with an offset to memcpy.

Thanks!

Feb 16 2022, 7:40 AM · Restricted Project
herhut added a comment to D119938: [mlir][MemRef] Lower memref.copy with an offset to memcpy.

Consider also adding an integration test. I think we have one for the other cases.

Feb 16 2022, 6:35 AM · Restricted Project
herhut accepted D119932: [mlir][gpu] Split ops sinking from gpu-kernel-outlining pass into separate pass.

Thanks for splitting this out.

Feb 16 2022, 6:00 AM · Restricted Project

Feb 15 2022

herhut added a comment to D119743: [MLIR][OpenMP][SCF] Mark parallel regions as allocation scopes.

Thanks for your reference to the scoping operation @ftynse. I had the feeling we had something like it but could not find it.

Feb 15 2022, 8:48 AM · Restricted Project
herhut added a comment to D119743: [MLIR][OpenMP][SCF] Mark parallel regions as allocation scopes.

My concern with only doing the scf.parallel operation is that we do lower it to scf.for loops in some cases and we would have to model this behavior there somehow. How would we do this? Do we have a suitable high-level abstraction that allows to insert an allocation scope? Alternatively, we could mark the scf.for loop the same. That seems a reasonable choice but scf.for supports returning values, so we might actually have escaping stack allocations currently. Is this a model we want to support?

Feb 15 2022, 3:26 AM · Restricted Project
herhut accepted D119632: [mlir][gpu] sinkOperationsIntoLaunchOp: Add user hook for isSinkingBeneficiary.

Thank you. Just a naming nit.

Feb 15 2022, 3:04 AM · Restricted Project

Feb 14 2022

herhut added a comment to D117427: Add verifier for gpu.alloc op.

Thanks for adding this. Could this rather reuse the logic from verifyAllocLike from the memref operations? It is the same logic but it would need to be exposed to other dialect.

Thanks for the suggestion. Is it allowed to expose this function to other dialect?

Hello @herhut,

Could you please reply to this?

Thanks,
Akshay

Feb 14 2022, 11:21 AM · Restricted Project
herhut added a comment to D119632: [mlir][gpu] sinkOperationsIntoLaunchOp: Add user hook for isSinkingBeneficiary.

Thank you. The default is fairly arbitrary (well, it's good enough for some index computations) and we really should have some cost model here. +1 to making it configurable at least.

Feb 14 2022, 9:31 AM · Restricted Project
herhut added reviewers for D119730: [mlir][tensor] Extend reshape utils.: mravishankar, ftynse.
Feb 14 2022, 9:06 AM · Restricted Project
herhut requested review of D119730: [mlir][tensor] Extend reshape utils..
Feb 14 2022, 8:55 AM · Restricted Project

Jan 31 2022

herhut accepted D118543: Remove OpTrait, AttrTrait and TypeTrait.
Jan 31 2022, 3:06 AM · Restricted Project, Restricted Project

Jan 26 2022

herhut added inline comments to D118241: [mlir] Move SCF utils implementations to SCF/Utils..
Jan 26 2022, 4:39 AM · Restricted Project

Jan 20 2022

herhut committed rG6d45284618f0: [mlir][memref] Add better support for identity layouts in memref.collapse_shape… (authored by herhut).
[mlir][memref] Add better support for identity layouts in memref.collapse_shape…
Jan 20 2022, 6:32 AM
herhut closed D117772: [mlir][memref] Add better support for identity layouts in memref.collapse_shape canonicalizer.
Jan 20 2022, 6:32 AM · Restricted Project
herhut added a comment to D117519: [MLIR][GPU] Add debug output to enable dumping GPU assembly.

Please fix the commit message though. I just noticed this now.

Jan 20 2022, 5:24 AM · Restricted Project
herhut accepted D117519: [MLIR][GPU] Add debug output to enable dumping GPU assembly.

Thanks.

Jan 20 2022, 5:24 AM · Restricted Project
herhut added a comment to D117772: [mlir][memref] Add better support for identity layouts in memref.collapse_shape canonicalizer.

PTAL

Jan 20 2022, 5:05 AM · Restricted Project
herhut updated the diff for D117772: [mlir][memref] Add better support for identity layouts in memref.collapse_shape canonicalizer.

Pull size checking out of helper.

Jan 20 2022, 5:03 AM · Restricted Project
herhut added reviewers for D117772: [mlir][memref] Add better support for identity layouts in memref.collapse_shape canonicalizer: bkramer, ftynse, nicolasvasilache.
Jan 20 2022, 4:23 AM · Restricted Project
herhut requested review of D117772: [mlir][memref] Add better support for identity layouts in memref.collapse_shape canonicalizer.
Jan 20 2022, 4:22 AM · Restricted Project

Jan 18 2022

herhut added a comment to D117519: [MLIR][GPU] Add debug output to enable dumping GPU assembly.

Thanks for adding this. I have wanted this a couple of times, too, but never went as far as creating a diff for it.

Jan 18 2022, 10:52 AM · Restricted Project

Jan 17 2022

herhut added a comment to D117427: Add verifier for gpu.alloc op.

Thanks for adding this. Could this rather reuse the logic from verifyAllocLike from the memref operations? It is the same logic but it would need to be exposed to other dialect.

Jan 17 2022, 4:41 AM · Restricted Project

Jan 14 2022

herhut committed rGaa3cabe3cbe8: [mlir][memref] Fix memref.copy of scalar memref (authored by herhut).
[mlir][memref] Fix memref.copy of scalar memref
Jan 14 2022, 7:16 AM
herhut closed D117314: [mlir][memref] Fix memref.copy of scalar memref.
Jan 14 2022, 7:15 AM · Restricted Project
herhut requested review of D117314: [mlir][memref] Fix memref.copy of scalar memref.
Jan 14 2022, 7:02 AM · Restricted Project
herhut committed rGab95ba704da4: [mlir][memref] Implement fast lowering of memref.copy (authored by herhut).
[mlir][memref] Implement fast lowering of memref.copy
Jan 14 2022, 5:22 AM
herhut closed D116099: [mlir][memref] Implement fast lowering of memref.copy.
Jan 14 2022, 5:22 AM · Restricted Project

Jan 13 2022

herhut updated the diff for D116099: [mlir][memref] Implement fast lowering of memref.copy.

fix test

Jan 13 2022, 3:06 AM · Restricted Project

Jan 12 2022

herhut accepted D117101: Fold arith.cmpf when at least one operand is known to be NaN..
Jan 12 2022, 5:40 AM · Restricted Project

Jan 11 2022

herhut added a comment to D117010: Mark arith.minf, arith.maxf as commutative..

The arith::minf operation is defined as

Jan 11 2022, 9:23 AM · Restricted Project
herhut accepted D117011: Remove NaN constant from arith.minf, arith.maxf expansion.

Thanks!

Jan 11 2022, 9:06 AM · Restricted Project
herhut added a comment to D116600: [linalg][fusion] Disallow fusion when it would create an invalid expand_shape.

I think Mahesh's suggestion is better because there is no guarantee in shape reification that you'd return 1 and you may well end up with propagating dynamic information further down.

There could well be a separate pass that inserts these casts to avoid the behavior in shape reification if that is critical to your use cases. I think it would still be better to fix shape reification to return a static value where possible. After all, if this is valid linalg IR, reification should do as good as it can with it.

Jan 11 2022, 8:48 AM · Restricted Project
herhut updated the diff for D116099: [mlir][memref] Implement fast lowering of memref.copy.

rebase

Jan 11 2022, 7:31 AM · Restricted Project
herhut accepted D117010: Mark arith.minf, arith.maxf as commutative..

Thanks!

Jan 11 2022, 6:07 AM · Restricted Project
herhut added inline comments to D117011: Remove NaN constant from arith.minf, arith.maxf expansion.
Jan 11 2022, 6:06 AM · Restricted Project