chandlerc (Chandler Carruth)Administrator
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Jul 7 2012, 2:54 PM (259 w, 1 d)
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Recent Activity

Yesterday

chandlerc added a comment to D34285: [SROA] Be smarter when copying metadata to retyped loads.

I landed some simpler refactorings in r306267 that should be enough to implement this.

Sun, Jun 25, 11:55 PM
chandlerc committed rL306267: [InstCombine] Factor the logic for propagating !nonnull and !range.
[InstCombine] Factor the logic for propagating !nonnull and !range
Sun, Jun 25, 8:31 PM
chandlerc added a comment to D34285: [SROA] Be smarter when copying metadata to retyped loads.

FYI, I started looking at this. I think a somewhat substantially different refactoring of the instcombine API makes this much simpler by *only* extracting the logic for nonnull and range propagation rather than extracting all of it.

Sun, Jun 25, 7:41 PM
chandlerc requested review of D33932: [clang-format] Add support for case-insensitive header matching and use it to improve support for LLVM-style include sorting..

Tried to address the test comment -- let me know if something else was intended.

Sun, Jun 25, 6:53 PM
chandlerc updated the diff for D33932: [clang-format] Add support for case-insensitive header matching and use it to improve support for LLVM-style include sorting..

Update based on review comments.

Sun, Jun 25, 6:53 PM
chandlerc committed rL306257: [LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr..
[LoopSimplify] Re-instate r306081 with a bug fix w.r.t. indirectbr.
Sun, Jun 25, 3:45 PM
chandlerc committed rL306256: [LoopSimplify] Improve a test for loop simplify minorly. NFC..
[LoopSimplify] Improve a test for loop simplify minorly. NFC.
Sun, Jun 25, 3:24 PM

Thu, Jun 22

chandlerc added a comment to D34471: [Inliner] Boost inlining of an indirect call to always_inline function..

Chandler's example does not involve any indirect calls so it is not related to this patch.

Thu, Jun 22, 9:14 PM
chandlerc added a comment to D34049: [LoopSimplify] Factor the logic to form dedicated exits into a utility..

Landed with the typo fix, thansk for the review!

Thu, Jun 22, 9:05 PM
chandlerc committed rL306081: [LoopSimplify] Factor the logic to form dedicated exits into a utility..
[LoopSimplify] Factor the logic to form dedicated exits into a utility.
Thu, Jun 22, 9:03 PM
chandlerc closed D34049: [LoopSimplify] Factor the logic to form dedicated exits into a utility. by committing rL306081: [LoopSimplify] Factor the logic to form dedicated exits into a utility..
Thu, Jun 22, 9:03 PM
chandlerc added a comment to D34157: [llvm-stress] Use C++11 mersenne_twister_engine random device instead of our own (PR32585).

my only concern is I have no idea if uniform_int_distribution guarantees the same behaviour on different targets as mersene does

It does not.
[rand.dist.general]/3:

The algorithms for producing each of the specified distributions are implementation-defined.

Thu, Jun 22, 3:08 PM
chandlerc accepted D34223: [Support] Don't use std::iterator, it's deprecated in C++17.

LGTM, but please update description when committing to explain that you're also leveraging the facade to flesh out the iterator operations and removing the now unecessary manual implementations.

Thu, Jun 22, 2:39 PM
chandlerc added a comment to D34471: [Inliner] Boost inlining of an indirect call to always_inline function..

FWIW, I'm not really a fan of this behavior in the inliner.

Thu, Jun 22, 2:35 PM

Wed, Jun 21

chandlerc accepted D33341: Enable vectorizer-maximize-bandwidth by default..

I thought I had been clear, sorry if not. This LGTM based on the llvm-dev discussion, please go ahead. =]

Wed, Jun 21, 12:58 PM
chandlerc added a comment to D33850: Inlining: Don't re-map simplified cloned instructions..

Sure, comments inline...

Wed, Jun 21, 11:22 AM

Wed, Jun 14

chandlerc created D34200: [PM/unswitch] Teach SimpleLoopUnswitch to do non-trivial unswitching, making it no longer even remotely simple..
Wed, Jun 14, 3:25 AM
chandlerc updated the diff for D34049: [LoopSimplify] Factor the logic to form dedicated exits into a utility..

Rebase and ping.

Wed, Jun 14, 12:43 AM
chandlerc added a comment to D34174: [x86] replace div/rem with shift/mask for shuffle combining.

This makes lots of sense to me. Honestly, fixing the multiplies might be worth it -- if you can benchmark >1% improvement, I might do it. I'm thinking about the architectures where integer multiplies are *very* slow (atom at least, also some ARM chips)

Wed, Jun 14, 12:35 AM

Tue, Jun 13

chandlerc accepted D33059: Create an shared include directory for gtest helper functions.

LGTM. Some comments below about the name of the library and getting the linking and other stuff set up correctly, but I'm happy for you to sort that out and land (and fix bots as necessary) w/o going through more rounds of review. =D

Tue, Jun 13, 3:05 PM
chandlerc requested changes to D33946: [InlineCost] Find identical loads in single block function.

Really cool!

Tue, Jun 13, 12:50 PM
chandlerc requested changes to D34157: [llvm-stress] Use C++11 mersenne_twister_engine random device instead of our own (PR32585).

Rather than using the RNG engine directly and using mod operations, the correct usage pattern is to use a distribution over the desired range and let it pull raw entropy out of the engine while mapping it into whatever distribution the use case requires.

Tue, Jun 13, 12:03 PM
chandlerc accepted D33341: Enable vectorizer-maximize-bandwidth by default..

Any update on this patch?

Tue, Jun 13, 11:02 AM
chandlerc added a comment to D33059: Create an shared include directory for gtest helper functions.

I think it is possible to avoid the explosion of EXPECT/ASSERT_THAT_<FOO> macros (I can't think of any right now, but I'm sure something will crop up eventually, which will require specific handling).

Tue, Jun 13, 1:48 AM

Mon, Jun 12

chandlerc added a reviewer for D33059: Create an shared include directory for gtest helper functions: rsmith.

FYI, I chatted with Zach in person to understand why the directory layout was as complicated as it was. I really wanted to simplify it. However, my initial attempts broke cross-project usage as Richard Smith pointed out, and this is *exactly* the kind of thing that we will really want to share across LLVM projects: Both LLD and potentially Clang will want access to things like the error matching utilities for their unittests.

Mon, Jun 12, 5:34 PM
chandlerc accepted D27826: Regenerate Halide benchmark bitcode files. Resolves TBAA verification failures..

Also, FYI, I agree with Krystof, updating the benchmarks is general goodness. We should be measuring against what Halide cares about, not some historical baseline.

Mon, Jun 12, 10:30 AM

Fri, Jun 9

chandlerc created D34049: [LoopSimplify] Factor the logic to form dedicated exits into a utility..
Fri, Jun 9, 3:38 AM

Thu, Jun 8

chandlerc added a comment to D33804: bugpoint: Prototype disabling symbolication of bugpoint-executed programs.

I'm pretty happy to start simple with a flag and go from there.

Thu, Jun 8, 8:12 PM
chandlerc added a comment to D33850: Inlining: Don't re-map simplified cloned instructions..

No longer needed because of https://reviews.llvm.org/D34017

Thu, Jun 8, 3:36 PM

Wed, Jun 7

chandlerc requested changes to D33850: Inlining: Don't re-map simplified cloned instructions..

I forgot to mention this: this needs a test case that would fail/crash before the patch. =]

Wed, Jun 7, 2:58 PM
chandlerc added a comment to D34006: [LoopSimplify] Add opt-bisect support to LoopSimplify pass.

What Andrew said.

Wed, Jun 7, 2:55 PM

Tue, Jun 6

chandlerc accepted D33850: Inlining: Don't re-map simplified cloned instructions..

I wrote this, but also have no memory of the intent. I'm pretty sure I was worried about something that could not in fact happen. I'm happy moving to an assert to check that in fact it does not happen. =]

Tue, Jun 6, 5:08 PM
chandlerc accepted D33843: Create a new library called ObjectLayout, and move headers from Support to there..

LGTM, ship it! (and watch aall the world burn!)

Tue, Jun 6, 5:04 PM
chandlerc committed rL304843: Fix the includes in lib/Fuzzer on Windows that have ordering.
Fix the includes in lib/Fuzzer on Windows that have ordering
Tue, Jun 6, 4:28 PM
chandlerc committed rL304792: Fix another ordering constraint with windows.h and comment about.
Fix another ordering constraint with windows.h and comment about
Tue, Jun 6, 5:43 AM
chandlerc committed rL304790: Fix several more missing headers, all of these were hidden by "lucky".
Fix several more missing headers, all of these were hidden by "lucky"
Tue, Jun 6, 5:32 AM
chandlerc committed rL304789: Add a missing #include to a header..
Add a missing #include to a header.
Tue, Jun 6, 5:22 AM
chandlerc added reviewers for D33934: [BPI] Don't assume that strcmp returning >0 is more likely than <0: iteratee, davidxl.

Generally makes sense, but maybe check the intuition of some other folks who've been hacking on static heuristics recently... Also, a small simplifying (I hope) comment inline.

Tue, Jun 6, 5:16 AM
chandlerc committed rL304788: Fix one place where I missed a commented requirement for a particular.
Fix one place where I missed a commented requirement for a particular
Tue, Jun 6, 5:11 AM
chandlerc added a comment to D33843: Create a new library called ObjectLayout, and move headers from Support to there..

If there are specific files you're seeing in that I didn't find, LMK.

There are. Let me try updating them quickly and a rebase should fix it right up.

Tue, Jun 6, 4:56 AM
chandlerc committed rL304787: Sort the remaining #include lines in include/... and lib/.....
Sort the remaining #include lines in include/... and lib/....
Tue, Jun 6, 4:54 AM
chandlerc added a comment to D33932: [clang-format] Add support for case-insensitive header matching and use it to improve support for LLVM-style include sorting..

Added more tests, PTAL?

Tue, Jun 6, 4:54 AM
chandlerc updated the diff for D33932: [clang-format] Add support for case-insensitive header matching and use it to improve support for LLVM-style include sorting..

Add test coverage for the case-insensitive category logic.

Tue, Jun 6, 4:53 AM
chandlerc committed rL304786: Re-sort #include lines for unittests. This uses a slightly modified.
Re-sort #include lines for unittests. This uses a slightly modified
Tue, Jun 6, 4:07 AM
chandlerc created D33932: [clang-format] Add support for case-insensitive header matching and use it to improve support for LLVM-style include sorting..
Tue, Jun 6, 3:56 AM
chandlerc added a comment to D33464: [PM][WIP] Enable out-of-tree registration of passes with the new PassBuilder.

Your testing strategy looks good. Comments below. I think this is getting close enough that it makes sense to start hacking on tests for it. Thanks so much for all the work here, I really like how this is turning out!

Tue, Jun 6, 2:19 AM
chandlerc committed rL304778: Fix an unused variable warning in non-asserts builds..
Fix an unused variable warning in non-asserts builds.
Tue, Jun 6, 12:50 AM

Mon, Jun 5

chandlerc committed rL304766: [x86] Stop this test from dirtying the source tree when run..
[x86] Stop this test from dirtying the source tree when run.
Mon, Jun 5, 8:25 PM
chandlerc added a comment to D33843: Create a new library called ObjectLayout, and move headers from Support to there..

Since the name discussion seems winding down, review on the code changes themselves...

Generally, there are a lot of unrelated #include order changes. Would it be ok if you (or I) do a widespread clang-format run over the #include lines to get them sorted so that your patch doesn't change that much? I'd like to avoid reverts or build bot trouble due to include order at the same time as trying to land the new library. Remaining (minor) comments inline.

Where are you seeing these? I didn't click all 300+ files, but I did click about 20 of them and the only order changes I see are because the new name has a different relative sort order than the old name. But nothing to do with the old names being unsorted. So an initial clang-format pass over the files wouldn't do anything.

If there are specific files you're seeing in that I didn't find, LMK.

Mon, Jun 5, 7:22 PM
chandlerc added a comment to D32684: [X86] Adding new LLVM TableGen backend that generates the X86 backend memory folding tables..

Reverted in r304762 and added another test case in r304763.

Mon, Jun 5, 7:19 PM
chandlerc committed rL304763: [x86] Add the test for folding stack spills into pextrw..
[x86] Add the test for folding stack spills into pextrw.
Mon, Jun 5, 7:16 PM
chandlerc committed rL304762: [x86] Revert the X86FoldTablesEmitter due to more miscompiles..
[x86] Revert the X86FoldTablesEmitter due to more miscompiles.
Mon, Jun 5, 7:16 PM
chandlerc added a comment to D33843: Create a new library called ObjectLayout, and move headers from Support to there..

Since the name discussion seems winding down, review on the code changes themselves...

Mon, Jun 5, 7:09 PM
chandlerc added a comment to D32684: [X86] Adding new LLVM TableGen backend that generates the X86 backend memory folding tables..

Folks, I know this has gone back and forth a few times, but I'm afraid I have to revert it again.

Mon, Jun 5, 5:08 PM

Fri, Jun 2

chandlerc added a comment to D33843: Create a new library called ObjectLayout, and move headers from Support to there..

About the only thing I find questionable here is the Magic.h bit... And really only because it also has file magic for archives and bitcode. But that's probably OK.

However, I hate to say this, but ObjectLayout doesn't seem like the right name. ObjectFormat would be closer or ObjectFile or something.

One idea would be to call this library BinaryFormat. That encompasses things that aren't necessarily object files.

Fri, Jun 2, 11:53 AM
chandlerc added a comment to D33843: Create a new library called ObjectLayout, and move headers from Support to there..

About the only thing I find questionable here is the Magic.h bit... And really only because it also has file magic for archives and bitcode. But that's probably OK.

Fri, Jun 2, 11:44 AM

Thu, Jun 1

chandlerc accepted D33164: [Profile[ Enhance expect lowering to handle correlated branches.

Cool! I like the replay logic. It's a little alarming that we will replay arbitrary number of operations on an arbitrary number of phi inputs, but I'm *really* not worried here and the simplicity and clarity of the logic resulting from simple replay is great.

Thu, Jun 1, 6:01 PM
chandlerc added a comment to D33464: [PM][WIP] Enable out-of-tree registration of passes with the new PassBuilder.

Generally this is starting to get pretty close. What are your thoughts on testing? I would suggest a unittest because that should be a good way to simulate an "out of tree" user.

Thu, Jun 1, 5:21 PM
chandlerc accepted D33810: [PM] Add GVNSink to the pipeline.

Do you want to add a test to the defaults file that enables both? I don't feel strongly while they're off-by-default. LGTM either way.

Thu, Jun 1, 4:51 PM
chandlerc accepted D33806: Move GVNHoist to the right position in the new pass manager pipeline.

LGTM, good catch!

Thu, Jun 1, 3:21 PM
chandlerc accepted D33692: [ThinLTO] Wire up ThinLTO and new PM.

This patch LGTM whenever the underlying LLVM change lands, thanks!!!!

Thu, Jun 1, 2:31 PM
chandlerc added a comment to D33799: [ThinLTO] Move -lto-use-new-pm to llvm-lto2, and change it to -use-new-pm..

(FWIW, I clearly like this patch as I sat with you. Mostly interested in tho folks who have worked on this library confirming they're happy with the API direction.)

Thu, Jun 1, 2:31 PM
chandlerc added a comment to D33164: [Profile[ Enhance expect lowering to handle correlated branches.

some of minor nits a a small thing left... thanks for the handling and the nice test cases around larger integers!

Thu, Jun 1, 2:29 PM
chandlerc added a comment to D33464: [PM][WIP] Enable out-of-tree registration of passes with the new PassBuilder.

First round of high-level feedback on this approach, thanks so much for working no this!

Thu, Jun 1, 5:17 AM
chandlerc accepted D33770: Only generate addcarry node when it is legal..

Ok, this seems like a trivial fix to a breakage, but please spell out in the patch description when you commit it what we discussed on IRC:

Thu, Jun 1, 4:59 AM
chandlerc committed rL304407: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..
[PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM.
Thu, Jun 1, 4:40 AM
chandlerc closed D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM. by committing rL304407: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..
Thu, Jun 1, 4:40 AM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

Thanks, landing with suggested fixes. (I also confirmed with David and Mehdi that they were happy.)

Thu, Jun 1, 4:39 AM
chandlerc added a comment to D33125: Introduce isoneof<T0, T1, ...> as an extension of isa<T>.

Honestly, the more I think about this, the more I think that the complexity it involves doesn't pull its weight.

Thu, Jun 1, 4:37 AM

Wed, May 31

chandlerc accepted D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..

LGTM, much nicer API now thanks!

Wed, May 31, 6:00 PM
chandlerc accepted D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..

Sorry, previous comment should have said LGTM with the tweak suggested.

Wed, May 31, 3:18 PM
chandlerc added a comment to D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..

Still not really happy with htis API, but let's fix it in a follow-up as it will grow the scope and much of the problem was already there (and the API is fairly narrow in scope).

Wed, May 31, 3:18 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

Ping? I think I've addressed all the comments... Other patches are kinda blocked on this...

Wed, May 31, 3:02 PM

Tue, May 30

chandlerc accepted D33701: [coroutines] Call initializePass in coroutine pass constructors .

The missing initialize calls seem good to fix as-is, so LGTM for that.

Tue, May 30, 7:18 PM
chandlerc added inline comments to D33651: Add note for location of other convenience functions..
Tue, May 30, 1:40 PM
chandlerc added inline comments to D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..
Tue, May 30, 1:02 AM
chandlerc added a comment to D33341: Enable vectorizer-maximize-bandwidth by default..

we're seeing nice improvements but also significant degradations, which we would like to investigate before the patch is committed.

Tue, May 30, 12:57 AM

May 26 2017

chandlerc added inline comments to D33608: [Analysis] RemoveTotalMemInst counting in InstCount to avoid reading back other Statistic variables.
May 26 2017, 7:41 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

(FYI, I think this is ready for another look, only outstanding issue I'm aware of is Mehdi's concern around 'pre-link' terminology and that really just needs anyone else with naming thoughts to chime in...)

May 26 2017, 7:33 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

For partial inlining, leave it consistent with old PM for now. We can introduce later an internal option to enable/disable pre-thin-link partial inlining and collect more performance number.

Is there a rationale for the position in the old PM? Was this discussed somewhere?

Do you really think I flipped a coin? git log/git blame easily find the original review that introduced the ThinLTO pipeline: http://reviews.llvm.org/D17115

May 26 2017, 7:31 PM
chandlerc added inline comments to D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..
May 26 2017, 7:23 PM
chandlerc added inline comments to D33164: [Profile[ Enhance expect lowering to handle correlated branches.
May 26 2017, 7:06 PM
chandlerc added a comment to D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..

(focusing on the LLVM side of this review for now)

Can you add an LLVM-based test? Can you add this to lib/Passes/PassRegistry.def?

Talked offline. Given the fact that BitcodeWriter (and possibly assembly writer?) is not registered either, it seems to be a larger issue that's out of the scope of this patch.

May 26 2017, 1:59 PM

May 25 2017

chandlerc committed rL303964: [IR] Add an iterator and range accessor for the PHI nodes of a basic.
[IR] Add an iterator and range accessor for the PHI nodes of a basic
May 25 2017, 8:10 PM
chandlerc closed D33533: [IR] Add an iterator and range accessor for the PHI nodes of a basic block. by committing rL303964: [IR] Add an iterator and range accessor for the PHI nodes of a basic.
May 25 2017, 8:10 PM
chandlerc added a comment to D33533: [IR] Add an iterator and range accessor for the PHI nodes of a basic block..

Thanks for all the comments Dave! I'm gonna land this with the fix below, but do let me know if you want any further work here.

May 25 2017, 7:59 PM
chandlerc committed rL303952: [PM] Enable the new simple loop unswitch pass in the new pass manager.
[PM] Enable the new simple loop unswitch pass in the new pass manager
May 25 2017, 6:24 PM
chandlerc updated the diff for D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

Address comments from both Teresa and David. Moved PartialIniling to run both
before and after thin link along with a FIXME to revisit the correct placement
of this pass long term.

May 25 2017, 4:21 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

I was aware that partial inlining is available in both pre and post link thinLTO pipelines. It is just not tuned. In fact, the right thing to do for ThinLTO is only do function outlining in the prelink step -- this will shrink function size and exposes more importing. The regular inliner in the post -link phase can handle those functions properly. Post thin-link needs another round of partial inlining after the inliner.

May 25 2017, 4:11 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

For partial inlining, leave it consistent with old PM for now. We can introduce later an internal option to enable/disable pre-thin-link partial inlining and collect more performance number.

May 25 2017, 3:46 PM
chandlerc added a comment to D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..

I hoisted the ThinLTO stop point pre-link above the partial inliner and the RPO function attr inference. Partial inlining isn't going to make the code smaller and it seems better to just do that once post-link.

Added davidxl to comment on this change. It seems like doing some partial inlining during the pre-link for ThinLTO will have an effect on the importing. Also, it is pre-link (as well as post-link) in the old pass pipeline, so this would introduce an inconsistency between the pass pipelines. May be better to keep it in the same places, and evaluate the effect of removing it from the pre-link pass pipeline separately?

May 25 2017, 2:43 PM
chandlerc added a comment to D33525: [ThinLTO] Migrate ThinLTOBitcodeWriter to the new PM..

(focusing on the LLVM side of this review for now)

May 25 2017, 2:28 AM
chandlerc added a comment to D33429: [NewPM] Initial pipeline for ThinLTO.

I patched this and re-worked the particular API it uses for exposing the ThinLTO logic into a different surface in https://reviews.llvm.org/D33540 as an alternative approach. Thoughts?

May 25 2017, 2:23 AM
chandlerc created D33540: [PM/ThinLTO] Port the ThinLTO pipeline (both components) to the new PM..
May 25 2017, 2:22 AM
chandlerc created D33539: [PM/PGO] Wire up the opt driver's new PM support to be able to run PGO..
May 25 2017, 1:08 AM
chandlerc committed rL303845: [PM] Teach the PGO instrumentation pasess to run GlobalDCE before.
[PM] Teach the PGO instrumentation pasess to run GlobalDCE before
May 25 2017, 12:15 AM
chandlerc closed D33535: [PM] Teach the PGO instrumentation pasess to run GlobalDCE before instrumenting code. by committing rL303845: [PM] Teach the PGO instrumentation pasess to run GlobalDCE before.
May 25 2017, 12:15 AM

May 24 2017

chandlerc added a comment to D33535: [PM] Teach the PGO instrumentation pasess to run GlobalDCE before instrumenting code..

Thanks, landing this to fix the immediate issue (with comments addressed).

May 24 2017, 11:43 PM
chandlerc committed rL303843: [PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch.
[PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch
May 24 2017, 11:33 PM
chandlerc closed D32740: [PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch pass. by committing rL303843: [PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch.
May 24 2017, 11:33 PM