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apilipenko (Artur Pilipenko)
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User Since
Apr 16 2015, 3:05 AM (441 w, 7 h)

Recent Activity

Tue, Sep 5

apilipenko committed rGebf01690d9b3: Bug fix for multi-line labels in CFG dot graph (authored by mark-sed).
Bug fix for multi-line labels in CFG dot graph
Tue, Sep 5, 10:02 PM · Restricted Project, Restricted Project
apilipenko closed D159207: Bug fix for D154102, where multi-line labels would get incorrect header splitter line in CFG dot.
Tue, Sep 5, 10:02 PM · Restricted Project, Restricted Project

Fri, Sep 1

apilipenko accepted D159207: Bug fix for D154102, where multi-line labels would get incorrect header splitter line in CFG dot.
Fri, Sep 1, 5:04 PM · Restricted Project, Restricted Project

Aug 17 2023

apilipenko committed rG3fee76cff343: Headers for basic blocks in CFG dot graphs (authored by mark-sed).
Headers for basic blocks in CFG dot graphs
Aug 17 2023, 7:56 AM · Restricted Project, Restricted Project
apilipenko closed D154102: Headers for basic blocks in control flow dot graphs.
Aug 17 2023, 7:55 AM · Restricted Project, Restricted Project

Aug 16 2023

apilipenko committed rG8ee909640800: Monospace font for CFG dot graphs (authored by mark-sed).
Monospace font for CFG dot graphs
Aug 16 2023, 9:12 PM · Restricted Project, Restricted Project
apilipenko committed rG7ffcea5488eb: Tooltips for CFG dot graphs (authored by mark-sed).
Tooltips for CFG dot graphs
Aug 16 2023, 9:07 PM · Restricted Project, Restricted Project
apilipenko closed D154096: Tooltips for control flow dot graphs.
Aug 16 2023, 9:06 PM · Restricted Project, Restricted Project
apilipenko closed D154092: Monospace font for control flow dot graphs.
Aug 16 2023, 9:06 PM · Restricted Project, Restricted Project

Aug 15 2023

apilipenko accepted D154102: Headers for basic blocks in control flow dot graphs.
Aug 15 2023, 2:47 PM · Restricted Project, Restricted Project

Jul 21 2023

apilipenko added a comment to D154584: Improve collectEphemeralValues and use it in CodeGenPrepare.

I wonder whether it will easier to review if I split this patch into three one:

  1. Use wouldInstructionBeTriviallyDead instead of checking side-effect and terminator only to extend the scope of collecting ephemeral values
  2. Use CodeMetrics utility in CodeGenPrepare
  3. Extend the algorithm for collecting ephemeral values by checking cycles (induction variable case)
Jul 21 2023, 7:21 PM · Restricted Project, Restricted Project
apilipenko added a comment to D151796: [SCEV] Skip min/max expressions when normalizing/denormalizing SCEV expressions.

I missed that change. Yes, that should be sufficient to address the original issue.

Jul 21 2023, 7:08 PM · Restricted Project, Restricted Project
apilipenko added a comment to D154102: Headers for basic blocks in control flow dot graphs.

I think a better structure would be:

  • Don't emit the block name in HandleBasicBlock. Instead of printing the BB, just iterate through the instructions and print them 1 by 1.
  • Unconditionally prepend the block name in CompleteNodeLabelString.
Jul 21 2023, 10:07 AM · Restricted Project, Restricted Project

Jul 13 2023

apilipenko added a comment to D151796: [SCEV] Skip min/max expressions when normalizing/denormalizing SCEV expressions.

We continue relying on normalization/denormalization round trip producing the original expression (e.g. D153004). Even if this patch doesn't fix all the cases where this property doesn't hold true, it is an improvement.

Jul 13 2023, 12:58 PM · Restricted Project, Restricted Project

May 25 2023

apilipenko added a comment to D150936: [Statepoints] Support for compressed pointers in the statepoint emission pass.

Right, one of the options would be to encode the information about GC pointer address spaces explicitly in the statepoint stack map.

May 25 2023, 2:30 PM · Restricted Project, Restricted Project

May 22 2023

apilipenko accepted D149747: [InlineCost] Consider branches with !make.implicit metadata as free..

Looks good.

May 22 2023, 7:54 PM · Restricted Project, Restricted Project
apilipenko added a comment to D151082: [GuardUtils] Allow intermmediate blocks between widenable branch and deopt block.

Why do we even care that an edge from a widenable condition branch terminates with a deopt? Widenable condition alone should be enough for widening.

May 22 2023, 7:51 PM · Restricted Project, Restricted Project
apilipenko added a comment to D150936: [Statepoints] Support for compressed pointers in the statepoint emission pass.

This seems oddly specific to the runtime you are working on. Why do you need to put compressed pointers into deopt bundes? Is it just to communicate the set of live compressed pointers to the runtime? In this case, coupling with deopt operand bundles seems incidental. We might be missing a more general mechanism for keeping track of different kinds of live GC pointers separately.

May 22 2023, 6:50 PM · Restricted Project, Restricted Project

May 2 2023

apilipenko added a comment to D149345: [Utils] Added the ability to print the pass number and IR after it is triggered.

We would like to have a way to take a snapshot of the IR at a specific point in the pipeline. Currently, you can either print the IR before/after a given pass (-print-before=<passname>) or print before/after all (-print-before-all). print-before will print the IR before all occurrences of the given pass. print-before-all will, well, print before all passes. While print-before-all can be used to achieve the same functionality of printing the pipeline and looking at the IR at a specific point in the pipeline, it's not very practical. For large compilations, print-before-all might take minutes to produce gigabytes of output.

May 2 2023, 8:03 PM · Restricted Project, Restricted Project

Apr 6 2023

apilipenko added a comment to D147662: [LoopPredication] Fix where we generate widened condition. PR61963.

Given that it's the second time we have to fix a similar issue, we should make a common utility for widening that makes it impossible to emit a widened condition in an incorrect context.

Apr 6 2023, 11:24 AM · Restricted Project, Restricted Project

Mar 20 2023

apilipenko added a comment to D146423: [Analys] Added new context analys for BB/Inst.

I don't think a separate analysis is justified here. If you want to improve the meta renamer just make the necessary changes there.

Mar 20 2023, 4:06 PM · Restricted Project, Restricted Project

Mar 17 2023

apilipenko accepted D146274: [LICM] Do not hoist widenable conditions.

Looks good to me. I don't think we had a specific motivation in mind for that change. And now we know a clear reason not to LICM widenable conditions.

Mar 17 2023, 2:01 PM · Restricted Project, Restricted Project

Feb 23 2023

apilipenko accepted D144585: [Nomination] Adding Nvidia Compiler security representative to the LLVM security group..
Feb 23 2023, 5:15 PM · Restricted Project, Restricted Project

Jan 30 2023

apilipenko accepted D142693: [GuardWidening] Choose right point for generating wide condition for branches. PR60234.
Jan 30 2023, 11:03 AM · Restricted Project, Restricted Project

Jan 24 2023

apilipenko added a comment to D136233: [SimpleLoopUnswitch] Inject loop-invariant conditions and unswitch them when it's profitable.

It occurred to me that this is an optimization only if the injected condition is likely. Then we would likely take the version with the loop with the removed loop variant condition. Otherwise, we spend code size and add an extra check before executing the loop with both loop variant conditions. I suggest using the profiling info on the branch to be eliminated to decide whether this is profitable.

Jan 24 2023, 12:43 PM · Restricted Project, Restricted Project

Jan 10 2023

apilipenko added inline comments to D136233: [SimpleLoopUnswitch] Inject loop-invariant conditions and unswitch them when it's profitable.
Jan 10 2023, 9:10 PM · Restricted Project, Restricted Project

Jan 9 2023

apilipenko added inline comments to D136233: [SimpleLoopUnswitch] Inject loop-invariant conditions and unswitch them when it's profitable.
Jan 9 2023, 9:05 PM · Restricted Project, Restricted Project

Jan 2 2023

apilipenko added a comment to D139275: [SimplifyCFG] `FoldBranchToCommonDest()`: deal with mismatched IV's in PHI's in common successor block.

FYI, this change caused widespread performance regressions in our testing. We haven't investigated further since the change was reverted.

Jan 2 2023, 11:26 AM · Restricted Project, Restricted Project

Dec 7 2022

apilipenko added inline comments to D136233: [SimpleLoopUnswitch] Inject loop-invariant conditions and unswitch them when it's profitable.
Dec 7 2022, 6:04 PM · Restricted Project, Restricted Project
apilipenko added inline comments to D137632: [LoopPredication] Widen checks if condition operands constant ranges are known.
Dec 7 2022, 11:30 AM · Restricted Project, Restricted Project

Nov 29 2022

apilipenko accepted D138898: [Nomination] Adding Mozilla representative to security group.
Nov 29 2022, 10:31 AM · Restricted Project, Restricted Project

Nov 17 2022

apilipenko added inline comments to D137926: [Utils] Improved chunk-print-before-all.py script.
Nov 17 2022, 5:03 PM · Restricted Project, Restricted Project
apilipenko added a comment to D138228: [LoopPeel] Expose ValueMap of last peeled iteration. NFC.

Looks reasonable to me. I would give it a day or two for others to take a look and if there are no objections go ahead and land.

Nov 17 2022, 3:23 PM · Restricted Project, Restricted Project
apilipenko added a comment to D125845: [InstCombine] Canonicalize GEP of GEP by swapping constant-indexed GEP to the back.

We also observe some regressions on internal benchmarks from this patch. We haven't yet analyzed why, but I will add details when we have something.

Nov 17 2022, 10:25 AM · Restricted Project, Restricted Project

Nov 14 2022

apilipenko added inline comments to D137926: [Utils] Improved chunk-print-before-all.py script.
Nov 14 2022, 4:32 PM · Restricted Project, Restricted Project
apilipenko added inline comments to D137632: [LoopPredication] Widen checks if condition operands constant ranges are known.
Nov 14 2022, 4:28 PM · Restricted Project, Restricted Project
apilipenko added a comment to D136233: [SimpleLoopUnswitch] Inject loop-invariant conditions and unswitch them when it's profitable.

A couple of high-level comments.

Nov 14 2022, 4:10 PM · Restricted Project, Restricted Project

Nov 7 2022

apilipenko accepted D136929: [Statepoint] Use default attributes for some GC intrinsics.

Looks good to me.

Nov 7 2022, 10:03 PM · Restricted Project, Restricted Project

Sep 23 2022

apilipenko added a comment to D134427: [Verifier] Allow undef token argument to llvm.experimental.gc.result.

This structural constraint (gc.result being tied to a statepoint instruction) can be violated in dead code. We've recently fixed a similar issue for gc.relocates in D128904.

Sep 23 2022, 2:54 PM · Restricted Project, Restricted Project

Sep 22 2022

apilipenko accepted D134427: [Verifier] Allow undef token argument to llvm.experimental.gc.result.
Sep 22 2022, 10:59 AM · Restricted Project, Restricted Project

Aug 25 2022

apilipenko accepted D132356: [SimplifyCFG] Don't widen cond br to cond br if false branch has successors.

LGTM with a small comment to address.

Aug 25 2022, 2:21 PM · Restricted Project, Restricted Project
apilipenko added a comment to D132356: [SimplifyCFG] Don't widen cond br to cond br if false branch has successors.

Is it true that every block which has successors will necessarily fall into this infinite loop?

No. What is special about this test is the fact that bb1 and bb2 have a branch on the same condition (undef).

Aug 25 2022, 2:18 PM · Restricted Project, Restricted Project

Aug 22 2022

apilipenko added a comment to D132356: [SimplifyCFG] Don't widen cond br to cond br if false branch has successors.

So, you are crippling this transformation to avoid an infinite loop with another transform in SimplifyCFG. This is probably OK as we still handle the common case of a widenable condition going to a deoptimization block.

Aug 22 2022, 6:39 PM · Restricted Project, Restricted Project

Aug 15 2022

apilipenko accepted D131146: [RS4GC] Handle vectors of pointers in non-live clobbering.
Aug 15 2022, 10:45 AM · Restricted Project, Restricted Project

Aug 11 2022

apilipenko accepted D129753: [SCEV] Prove condition invariance via context.
Aug 11 2022, 10:39 PM · Restricted Project, Restricted Project
apilipenko added inline comments to D129753: [SCEV] Prove condition invariance via context.
Aug 11 2022, 10:34 PM · Restricted Project, Restricted Project
apilipenko added inline comments to D129753: [SCEV] Prove condition invariance via context.
Aug 11 2022, 6:09 PM · Restricted Project, Restricted Project

Aug 2 2022

apilipenko accepted D129643: [SCEV] Use context to strengthen flags of BinOps.
Aug 2 2022, 1:55 PM · Restricted Project, Restricted Project

Jul 21 2022

apilipenko added inline comments to D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 21 2022, 9:32 AM · Restricted Project, Restricted Project
apilipenko accepted D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 21 2022, 8:55 AM · Restricted Project, Restricted Project

Jul 20 2022

apilipenko added inline comments to D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 20 2022, 8:30 AM · Restricted Project, Restricted Project

Jul 19 2022

apilipenko added inline comments to D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 19 2022, 10:09 AM · Restricted Project, Restricted Project

Jul 18 2022

apilipenko added inline comments to D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 18 2022, 7:41 PM · Restricted Project, Restricted Project

Jul 15 2022

apilipenko added inline comments to D129561: [RS4GC] Handle special cases in unreachable code for memcpy/memmov.
Jul 15 2022, 3:02 PM · Restricted Project, Restricted Project

Jul 1 2022

apilipenko added a comment to D128155: [GuardWidening] Use freeze to widen using possible poison value..

Could you please give a brief outline of the approach?

Jul 1 2022, 8:17 PM · Restricted Project, Restricted Project
apilipenko added inline comments to D128904: Bug fix "GC relocate is incorrectly tied to the statepoint".
Jul 1 2022, 8:12 PM · Restricted Project, Restricted Project

Jun 22 2022

apilipenko accepted D128254: [RS4GC] Handle freeze case for vector.

In other instructions, we seem to just duplicate the handling in findBaseDefiningValueOfVector and findBaseDefiningValue. Doing so for freeze would be more consistent with the existing code.

Jun 22 2022, 11:53 AM · Restricted Project, Restricted Project

Jun 15 2022

apilipenko added a comment to D127884: POC: Add `elementtype` attribute requirement on atomic memory intrinsics..

The optimizer can insert new atomic memcpy/memmove calls, e.g loop-idiom-recognize would do that. Currently, when loop-idiom-recognize inserts such a call it doesn't tag it with the element type, which makes it an incorrect transform for us.

Jun 15 2022, 3:12 PM · Restricted Project, Restricted Project

May 25 2022

apilipenko added a comment to D125690: [MemIntrinsics] Add an API to get elementtype attribute value. NFC..

Copying arrays of pointers in environments with moving garbage collector is different from copying of 'primitive' types of the same types.
Well, I understand that upstream may not take it as a 'justification'.

May 25 2022, 12:30 PM · Restricted Project, Restricted Project

Apr 26 2022

apilipenko committed rG5ee0123642fe: [EarlyCSE] Add tests demonstrating missed opportunitites (authored by apilipenko).
[EarlyCSE] Add tests demonstrating missed opportunitites
Apr 26 2022, 12:01 PM · Restricted Project, Restricted Project

Apr 19 2022

apilipenko accepted D119137: Replace Steve Klabnik with Josh Stone as one of the Rust Security Response WG representatives.
Apr 19 2022, 12:21 PM · Restricted Project, Restricted Project

Apr 5 2022

apilipenko committed rG857d699667f6: Move BasicBlock::getTerminator definition to the header (authored by apilipenko).
Move BasicBlock::getTerminator definition to the header
Apr 5 2022, 1:12 PM · Restricted Project, Restricted Project

Mar 31 2022

apilipenko committed rG4fbde1ef40e6: Fix MemorySSAUpdater::insertDef for dead code (authored by apilipenko).
Fix MemorySSAUpdater::insertDef for dead code
Mar 31 2022, 4:33 PM · Restricted Project, Restricted Project
apilipenko closed D122601: Fix MemorySSAUpdater::insertDef for dead code.
Mar 31 2022, 4:33 PM · Restricted Project, Restricted Project

Mar 28 2022

apilipenko requested review of D122601: Fix MemorySSAUpdater::insertDef for dead code.
Mar 28 2022, 11:07 AM · Restricted Project, Restricted Project

Jan 24 2022

apilipenko accepted D116150: [SCEV] Use lshr in implications.
Jan 24 2022, 4:10 AM · Restricted Project

Jan 18 2022

apilipenko added inline comments to D116150: [SCEV] Use lshr in implications.
Jan 18 2022, 5:18 PM · Restricted Project

Jan 12 2022

apilipenko added inline comments to D116150: [SCEV] Use lshr in implications.
Jan 12 2022, 2:59 AM · Restricted Project

Dec 14 2021

apilipenko accepted D115657: [Nomination] Adding Intel representatives to security group.
Dec 14 2021, 11:20 AM · Restricted Project

Nov 24 2021

apilipenko committed rGaa60d169ea62: [CVP] Add a cl::opt for canonicalization of signed relational comparisons (authored by apilipenko).
[CVP] Add a cl::opt for canonicalization of signed relational comparisons
Nov 24 2021, 1:53 PM
apilipenko added a comment to D112895: [CVP] Canonicalize signed relational comparisons of scalar integers to unsigned comparison predicates.

Do you mind if I put this change under an on by default cl::opt flag? This way we can temporarily turn it off downstream.

Nov 24 2021, 10:27 AM · Restricted Project

Nov 23 2021

apilipenko added a comment to D112895: [CVP] Canonicalize signed relational comparisons of scalar integers to unsigned comparison predicates.

This change broke the ability to discard checks in some cases. Consider this example:

define i1 @test1(i32 %a, i32* %b_ptr) {
  %b = load i32, i32* %b_ptr, align 8, !range !{i32 0, i32 2147483646}
  %c1 = icmp slt i32 %a, %b
  br i1 %c1, label %exit, label %cont.1
Nov 23 2021, 11:40 AM · Restricted Project

Nov 9 2021

apilipenko added a comment to D112693: [SimplifyCFG] Fix miscompile in tryWidenCondBranchToCondBranch. PR52290.

I agree with Philip, widening transformation doesn't rely on deoptimizations.

Nov 9 2021, 12:20 PM · Restricted Project, Restricted Project

Oct 19 2021

apilipenko accepted D111668: [LoopPredication] Calculate profitability without BPI.
Oct 19 2021, 9:51 AM · Restricted Project

Oct 14 2021

apilipenko committed rG3f96f7b30c91: Fix getInlineCost with ComputeFullInlineCost enabled (authored by apilipenko).
Fix getInlineCost with ComputeFullInlineCost enabled
Oct 14 2021, 5:48 PM
apilipenko closed D111687: Fix getInlineCost with ComputeFullInlineCost enabled.
Oct 14 2021, 5:48 PM · Restricted Project
apilipenko updated the diff for D111687: Fix getInlineCost with ComputeFullInlineCost enabled.

Add a simple test case using -inline-cost-full cl::opt.

Oct 14 2021, 2:38 PM · Restricted Project

Oct 12 2021

apilipenko updated the diff for D111687: Fix getInlineCost with ComputeFullInlineCost enabled.
Oct 12 2021, 8:31 PM · Restricted Project
apilipenko requested review of D111687: Fix getInlineCost with ComputeFullInlineCost enabled.
Oct 12 2021, 6:15 PM · Restricted Project

Oct 5 2021

apilipenko added a comment to D109504: [WIP] [Intrinsics] Introduce memcmp intrinsics..

I also notice that the new memcmp intrinsic returns i1, which is different from libc memcmp. libc memcmp returns and int indicating which of the sides was greater. Looks like, the new intrinsic matches with bcmp semantic.

Oct 5 2021, 4:29 PM · Restricted Project, Restricted Project
apilipenko added a comment to D109504: [WIP] [Intrinsics] Introduce memcmp intrinsics..

Since this is a change to LangRef, please, post the proposal to llvm-dev.

Oct 5 2021, 4:21 PM · Restricted Project, Restricted Project

Aug 4 2021

apilipenko added a comment to D107345: Introduce LowerGCLeafIntrinsics pass.

There is a target-specific hook to emit code for regular (non-atomic) memcpys: EmitTargetCodeForMemcpy. Maybe we should just implement a similar hook for element-atomic copy?

Aug 4 2021, 9:16 PM · Restricted Project
apilipenko added a comment to D107345: Introduce LowerGCLeafIntrinsics pass.

I think the name of the pass is misleading. What you are doing here is you provide an inlined lowering for a memory builtin. Your current implementation has a limitation such that it only inlines gc-leaf element atomic memcpys. I don't think the fact that it is gc-leaf is critical here. This transform can be extended to handle non-GC leaf operations. It can also be extended to handle non-atomic operations.

Aug 4 2021, 7:15 PM · Restricted Project

Jul 1 2021

apilipenko accepted D105118: [remangleIntrinsicFunction] Detect and resolve name clash.

Looks good.

Jul 1 2021, 8:59 AM · Restricted Project

Jun 30 2021

apilipenko added inline comments to D105118: [remangleIntrinsicFunction] Detect and resolve name clash.
Jun 30 2021, 9:45 AM · Restricted Project

Jun 18 2021

apilipenko added a comment to D104403: [SCEV] Avoid pointer subtraction of non-integral pointers [WIP].

FYI, I tried to take this patch for performance verification, but it crashed in smoke testing. I haven't yet looked why.

Jun 18 2021, 10:15 AM · Restricted Project

Jun 8 2021

apilipenko committed rG9197bac297f7: Add an option to hide "cold" blocks from CFG graph (authored by apilipenko).
Add an option to hide "cold" blocks from CFG graph
Jun 8 2021, 11:30 AM
apilipenko closed D103640: Add an option to hide "cold" blocks from CFG graph.
Jun 8 2021, 11:29 AM · Restricted Project

Jun 3 2021

apilipenko requested review of D103640: Add an option to hide "cold" blocks from CFG graph.
Jun 3 2021, 12:06 PM · Restricted Project
apilipenko committed rG5a2aec3f27ab: NFC. Mark DOTFuncInfo getters as const (authored by apilipenko).
NFC. Mark DOTFuncInfo getters as const
Jun 3 2021, 11:27 AM
apilipenko committed rGa06e63fa522f: NFC. Refactor DOTGraphTraits::isNodeHidden (authored by apilipenko).
NFC. Refactor DOTGraphTraits::isNodeHidden
Jun 3 2021, 11:27 AM

Mar 24 2021

apilipenko added a comment to D99135: [deref] Implement initial set of inference rules for deref-at-point.

I looked at the GC part and it looks good to me.

Mar 24 2021, 3:30 PM · Restricted Project

Nov 19 2020

apilipenko committed rG887c7660bdf3: [BasicAA] Deoptimize intrinsics don't modify memory (authored by apilipenko).
[BasicAA] Deoptimize intrinsics don't modify memory
Nov 19 2020, 12:09 PM
apilipenko closed D91658: [BasicAA] Deoptimize intrinsics don't modify memory.
Nov 19 2020, 12:08 PM · Restricted Project

Nov 17 2020

apilipenko requested review of D91658: [BasicAA] Deoptimize intrinsics don't modify memory.
Nov 17 2020, 1:35 PM · Restricted Project

Nov 11 2020

apilipenko accepted D90395: [NFC][SCEV] Generalize monotonicity check for full and limited iteration space.
Nov 11 2020, 8:45 AM · Restricted Project

Nov 10 2020

apilipenko added inline comments to D90395: [NFC][SCEV] Generalize monotonicity check for full and limited iteration space.
Nov 10 2020, 7:15 PM · Restricted Project
apilipenko accepted D91126: [SCEV] Generalize no-self-wrap check in isLoopInvariantExitCondDuringFirstIterations.
Nov 10 2020, 7:10 PM · Restricted Project

Nov 9 2020

apilipenko added a comment to D90395: [NFC][SCEV] Generalize monotonicity check for full and limited iteration space.

Can we split restructuring and generalization (possibly adding a test for the generalization part)? It's hard to assess correctness when you combine the two in one change.

Nov 9 2020, 4:19 PM · Restricted Project

Oct 26 2020

apilipenko accepted D87832: [IndVars] Remove monotonic checks with unknown exit count.

Accepting this change to unblock the progress.

Oct 26 2020, 5:23 PM · Restricted Project