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hsmhsm (Mahesha S)
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User Since
Jan 14 2020, 12:20 AM (65 w, 21 h)

Recent Activity

Today

hsmhsm requested review of D100441: [AMDGPU] Rename "LDS lowering" pass name..
Tue, Apr 13, 8:39 PM · Restricted Project
hsmhsm updated the diff for D100300: [AMDGPU] Refactor ds_read/ds_write related select code for better readability..

Fixed review comments by Stas.

Tue, Apr 13, 4:00 AM · Restricted Project

Yesterday

hsmhsm added inline comments to D100300: [AMDGPU] Refactor ds_read/ds_write related select code for better readability..
Mon, Apr 12, 7:39 AM · Restricted Project
hsmhsm requested review of D100300: [AMDGPU] Refactor ds_read/ds_write related select code for better readability..
Mon, Apr 12, 4:29 AM · Restricted Project

Wed, Apr 7

hsmhsm abandoned D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..

I am abandoning this patch since an alternative patch - https://reviews.llvm.org/D100008 is landed in upstream. Next step is to do some useful performance related experimentation for unaligned accessing of ds instructions before coming to a common conclusion on more generic fix.

Wed, Apr 7, 7:48 PM · Restricted Project
hsmhsm committed rGac64995ceb40: [AMDGPU] Only use ds_read/write_b128 for alignment >= 16 (authored by hsmhsm).
[AMDGPU] Only use ds_read/write_b128 for alignment >= 16
Wed, Apr 7, 7:43 PM
hsmhsm closed D100008: [AMDGPU] Only use ds_read/write_b128 for alignment >= 16.
Wed, Apr 7, 7:42 PM · Restricted Project
hsmhsm committed rGd5fee599c520: [AMDGPU] Add some exhaustive ds read/write alignment tests (authored by hsmhsm).
[AMDGPU] Add some exhaustive ds read/write alignment tests
Wed, Apr 7, 7:40 PM
hsmhsm closed D100007: [AMDGPU] Add some exhaustive ds read/write alignment tests.
Wed, Apr 7, 7:39 PM · Restricted Project

Tue, Apr 6

hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Hi Jon,

Tue, Apr 6, 8:25 PM · Restricted Project
hsmhsm requested review of D100008: [AMDGPU] Only use ds_read/write_b128 for alignment >= 16.
Tue, Apr 6, 8:08 PM · Restricted Project
hsmhsm requested review of D100007: [AMDGPU] Add some exhaustive ds read/write alignment tests.
Tue, Apr 6, 8:01 PM · Restricted Project

Mon, Mar 29

hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Mon, Mar 29, 1:13 AM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

I can't work out which LDS variables you intend to replace with pointers from the code. Could you spell out what the condition under which you intend to replace one is?

Mon, Mar 29, 1:07 AM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

This is much more complicated than I expected.

Mon, Mar 29, 1:05 AM · Restricted Project

Thu, Mar 25

hsmhsm added inline comments to D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..
Thu, Mar 25, 10:28 PM · Restricted Project
hsmhsm added inline comments to D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..
Thu, Mar 25, 10:26 PM · Restricted Project
hsmhsm added a comment to D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..

Do we have tests where pointers are actually 16 byte aligned?

Thu, Mar 25, 10:25 PM · Restricted Project
hsmhsm updated the diff for D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..

Updated the fix - make sure that the function allowsMisalignedMemoryAccessesImpl()
checks for the strict alignment requirment for ds_read/ds_write operations.

Thu, Mar 25, 10:23 PM · Restricted Project
hsmhsm updated the diff for D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..

After fixing the review comments by Jay, below tests asserts. Yet to investigate it.

Thu, Mar 25, 11:08 AM · Restricted Project
hsmhsm added inline comments to D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..
Thu, Mar 25, 10:33 AM · Restricted Project
hsmhsm added a comment to D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..
NOTE: As of now, I have intentionally *NOT* updated lit tests since update seems to be not trivial. I actually wanted to initiate review discussion and fix the review comments so that I can update the lit tests once-for-all at the end.
Thu, Mar 25, 9:57 AM · Restricted Project
hsmhsm requested review of D99352: [AMDGPU] ds_read_*/ds_write_* operations require strict alignment..
Thu, Mar 25, 9:52 AM · Restricted Project

Tue, Mar 23

hsmhsm added a comment to D98491: [AMDGPU] Split GCN subtarget features for unaligned access.

@mbrkusanin
My proposal was simple: prefer ds_read2_b64 (and write) over b128 if alignment < 16. I never heard of b64 performance issues though, so the rest is the same as now: create a widest load/store possible with that one exception for b128.

We have since then confirmed that ds_read_b64 has the same performance hit on memory not aligned to 64 bit, so 64 bit operations too need an alignment check.

But I see the below ISel pattern for - DS_READ_B64 indeed checks alignment requirment, though not sure if it is over written some where else.

DSInstructions.td:717-719

foreach vt = VReg_64.RegTypes in {
defm : DSReadPat_mc <DS_READ_B64, vt, "load_align8_local">;
}
Tue, Mar 23, 10:05 AM · Restricted Project
hsmhsm added a comment to D98491: [AMDGPU] Split GCN subtarget features for unaligned access.

@mbrkusanin
My proposal was simple: prefer ds_read2_b64 (and write) over b128 if alignment < 16. I never heard of b64 performance issues though, so the rest is the same as now: create a widest load/store possible with that one exception for b128.

We have since then confirmed that ds_read_b64 has the same performance hit on memory not aligned to 64 bit, so 64 bit operations too need an alignment check.

Tue, Mar 23, 9:17 AM · Restricted Project
hsmhsm added a comment to D98491: [AMDGPU] Split GCN subtarget features for unaligned access.

I see some comments from @rampitec and @arsenm, and @rampitec had also made below comments in the related internal JIRA ticket.

Tue, Mar 23, 2:17 AM · Restricted Project

Mon, Mar 22

hsmhsm abandoned D98865: [AMDGPU] Disable forceful inline of non-kernel functions which use LDS..

The https://reviews.llvm.org/D91516 also includes changes in this current patch, hence this patch is no longer required. All the review discussions and comments can be taken care within https://reviews.llvm.org/D91516 itself.

Mon, Mar 22, 11:52 PM · Restricted Project
hsmhsm added a reviewer for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers.: rampitec.
Mon, Mar 22, 11:41 PM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Mon, Mar 22, 11:35 PM · Restricted Project
hsmhsm retitled D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers. from [AMDGPU][WIP] Lower LDS Global Variables. to [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Mon, Mar 22, 11:33 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Implemented a new approach based on initializing LDS globals to pointers.

Mon, Mar 22, 11:32 PM · Restricted Project

Thu, Mar 18

hsmhsm updated the diff for D98865: [AMDGPU] Disable forceful inline of non-kernel functions which use LDS..

Address the review comments by Matt.

Thu, Mar 18, 8:20 AM · Restricted Project
hsmhsm requested review of D98865: [AMDGPU] Disable forceful inline of non-kernel functions which use LDS..
Thu, Mar 18, 6:51 AM · Restricted Project

Feb 13 2021

hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Could we get some tests *and* a commit message that explains what this is supposed to do.

This is WIP, will add test and commit messages at the end before final review.

I generally would recommend against that but I guess you can use phabricator this way.
However, once people can figure out what this is actually supposed to do, they might effectively restart the entire review process if the design is questioned.
I say this because I have a hunch, or maybe a hope, about the intent of this patch. If it would be that, I'd very much like this to be a generic, non-AMDGPU pass. I might be wrong about what this does, and that is what I'd like to figure out rather sooner than later.

Feb 13 2021, 6:05 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Remove over created auto variables.

Feb 13 2021, 12:31 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Address clang-tidy warnings.

Feb 13 2021, 12:17 AM · Restricted Project

Feb 12 2021

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Assert that both caller and callee appear in same translation unit.

Feb 12 2021, 9:30 PM · Restricted Project
hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Feb 12 2021, 8:38 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Address Matt's comments.

Feb 12 2021, 8:34 PM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Could we get some tests *and* a commit message that explains what this is supposed to do.

Feb 12 2021, 7:24 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Save current work.

Feb 12 2021, 1:31 AM · Restricted Project

Feb 8 2021

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Save current work.

Feb 8 2021, 7:32 PM · Restricted Project

Feb 2 2021

hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Feb 2 2021, 7:59 PM · Restricted Project

Jan 29 2021

hsmhsm retitled D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers. from [AMDGPU][WIP] Lower Function Local LDS Variables. to [AMDGPU][WIP] Lower LDS Global Variables..
Jan 29 2021, 3:11 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed Matt's comments.

Jan 29 2021, 3:10 AM · Restricted Project

Jan 28 2021

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Pushing renamed code (not for review).

Jan 28 2021, 8:36 PM · Restricted Project

Jan 26 2021

hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 26 2021, 9:13 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed review comments (by Matt).

Jan 26 2021, 8:55 AM · Restricted Project

Jan 25 2021

hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 25 2021, 9:01 AM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 25 2021, 9:01 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Improvements to code at few places.

Jan 25 2021, 8:39 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Make use of llvm append_range() api.

Jan 25 2021, 6:19 AM · Restricted Project

Jan 24 2021

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed one of the FIXME comments which is associated with indirect calls.

Jan 24 2021, 10:47 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Corrected few comments.

Jan 24 2021, 9:01 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Code re-organization.

Jan 24 2021, 8:39 PM · Restricted Project

Jan 22 2021

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed clang-tidy warnings.

Jan 22 2021, 11:40 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Re-arrange code for more readability.

Jan 22 2021, 11:18 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fix comments.

Jan 22 2021, 10:17 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fix few spell mistakes in comments.

Jan 22 2021, 10:05 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fix few spell mistakes in comments.

Jan 22 2021, 9:59 PM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 22 2021, 9:47 PM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 22 2021, 9:46 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Add missing explicit keyword for constructor.

Jan 22 2021, 9:44 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Added a FIXME comment.

Jan 22 2021, 8:44 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Add missing "static" keyword to a function isKernel().

Jan 22 2021, 8:08 PM · Restricted Project
hsmhsm added reviewers for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers.: madhur13490, sameerds.
Jan 22 2021, 8:03 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Build all the required data structures which will be later used to lower function local LDS. Below are the data structures being built.

Jan 22 2021, 8:01 PM · Restricted Project

Jan 19 2021

hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 19 2021, 9:44 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Based on the Matt's comment for previous patch, some changes are done w.r.t the handling of the guarding flag - amdgpu-enable-function-local-lds-lowering.

Jan 19 2021, 8:53 PM · Restricted Project
hsmhsm added inline comments to D94648: [amdgpu] Implement lower function LDS pass.
Jan 19 2021, 8:42 AM · Restricted Project
hsmhsm added inline comments to D94648: [amdgpu] Implement lower function LDS pass.
Jan 19 2021, 6:19 AM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Started to implement the feature from scratch again. The previous experience tells me that - "a single very big patch is very problamatic and confusing for a meanigful review process". Hence this time, I am planning to submit small patches (time to time) which can be reasonably reviewed. This first patch implements the following.

Jan 19 2021, 2:33 AM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 19 2021, 2:27 AM · Restricted Project
hsmhsm retitled D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers. from [AMDGPU] Support for device scope shared variables to [AMDGPU][WIP] Lower Function Local LDS Variables..
Jan 19 2021, 2:27 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

[0] Started re-implementing from scratch again.
[1] Added a new pass, namely, amdgpu-lower-function-local-lds.
[2] Implemented required initial plumbing work for both old and new pass

managers.

[3] An option, namely, amdgpu-enable-function-local-lds-lowering is

added, when passed, it enables the pass.
Jan 19 2021, 2:25 AM · Restricted Project

Jan 8 2021

hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 8 2021, 8:08 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed few more review comments.

Jan 8 2021, 8:05 PM · Restricted Project
hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 8 2021, 8:15 AM · Restricted Project
hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 8 2021, 6:37 AM · Restricted Project
hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Jan 8 2021, 3:04 AM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

There are too many review comments - some are trivial and some are non-trivial. And I have my own doubts about some of the comments being made. Hence let's handle all these comments file by file and within a file, function by function. Otherwise, it only makes the review process more difficult.

Jan 8 2021, 2:42 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed few trivial review comments (by Matt).

Jan 8 2021, 2:37 AM · Restricted Project

Jan 7 2021

hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

PING

Jan 7 2021, 5:39 AM · Restricted Project

Jan 5 2021

hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

I do not understand what you mean by above sentence.

I think this patch is better suited to the internal AMD branch than to trunk.

Jan 5 2021, 6:35 PM · Restricted Project

Dec 23 2020

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed clang-tidy warnings.

Dec 23 2020, 11:23 PM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

I believe the intended effect of this pass is:

  • Allow functions called directly to access LDS without being inlined
Dec 23 2020, 7:05 PM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

I am sad to hear that. I thought the new scheme might be addressing that limitation.

Direct calls containing LDS already work (llc inlines them). If the patch is correct, does it enable anything that doesn't already work?

Dec 23 2020, 10:55 AM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Do recursive and indirect calls work with the new scheme? If so the description needs updating

Dec 23 2020, 10:26 AM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Dec 23 2020, 10:10 AM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Dec 23 2020, 10:08 AM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Re-implemented the feature based on 2D offset table.

Dec 23 2020, 10:01 AM · Restricted Project

Nov 18 2020

hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Updated lit tests based on latest source changes.

Nov 18 2020, 3:12 AM · Restricted Project

Nov 17 2020

hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Nov 17 2020, 11:23 PM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

This is a bit different than the most recent proposal which I thought avoided the need to pass multiple arguments per kernel and allowed supporting indirect calls. I thought this was going to produce a table in constant memory containing the offsets which would be indexed instead.

We had not arrived at any general consensus on which approach to stick to. Following were the sugguested proposals:

(1) Function argument driven approach:
(2) Table driven approach:

(2.1)  Table within global memory
(2.2)  Table within shared memory
(2.2.)  Table within constant memory

Being a less used feature, and also as suggested by Sam in his one of the early emails (while disussing it), I have choosen approach (1) since I felt that it is comparitavely simpler approach, and try others only when this approach does not practically work either due to performance issues or any other valid reasons.

Nov 17 2020, 11:20 PM · Restricted Project
hsmhsm updated the summary of D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Nov 17 2020, 11:06 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed some of the review comments by Matt.

Nov 17 2020, 11:02 PM · Restricted Project

Nov 16 2020

hsmhsm added inline comments to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..
Nov 16 2020, 8:39 PM · Restricted Project
hsmhsm added a comment to D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

This is a bit different than the most recent proposal which I thought avoided the need to pass multiple arguments per kernel and allowed supporting indirect calls. I thought this was going to produce a table in constant memory containing the offsets which would be indexed instead.

We had not arrived at any general consensus on which approach to stick to. Following were the sugguested proposals:

Nov 16 2020, 8:34 PM · Restricted Project
hsmhsm updated the diff for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers..

Fixed warnings by clang-tidy.

Nov 16 2020, 12:38 AM · Restricted Project

Nov 15 2020

hsmhsm removed a reviewer for D91516: [AMDGPU] Replace uses of LDS globals within non-kernel functions by pointers.: jdoerfert.
Nov 15 2020, 11:18 PM · Restricted Project