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rampitec (Stanislav Mekhanoshin)
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User Since
Apr 4 2014, 4:14 AM (424 w, 12 h)

Recent Activity

Today

rampitec accepted D126074: [AMDGPU] Mark SMEM cache invalidations as not reading memory.
Fri, May 20, 8:56 AM · Restricted Project, Restricted Project
rampitec accepted D126070: [AMDGPU][MC][GFX940] Disable v_mac_f32_dpp.
Fri, May 20, 8:55 AM · Restricted Project, Restricted Project

Yesterday

rampitec requested review of D126009: [AMDGPU] Enforce alignment of image vaddr on gfx90a.
Thu, May 19, 1:04 PM · Restricted Project, Restricted Project
rampitec added a comment to D125997: [AMDGPU] Instruction Type Pipeline.

Add [AMDGPU] to the title.

Thu, May 19, 11:34 AM · Restricted Project, Restricted Project
rampitec added inline comments to D125992: [AMDGPU] gfx11 FLAT Instructions.
Thu, May 19, 11:32 AM · Restricted Project, Restricted Project
rampitec accepted D125985: [AMDGPU] Mark s_get_waveid_in_workgroup as not reading memory.
Thu, May 19, 10:39 AM · Restricted Project, Restricted Project
rampitec added a reviewer for D125970: [amdgpu] Add amdgpu_kernel calling conv attribute to clang: yaxunl.
Thu, May 19, 10:37 AM · Restricted Project, Restricted Project
rampitec accepted D125968: [AMDGPU] Mark s_getreg as having side effects instead of reading memory.
Thu, May 19, 10:35 AM · Restricted Project, Restricted Project
rampitec accepted D125857: [InstCombine] [NFC] Use a pattern matcher for ExtractElementInst..

LGTM

Thu, May 19, 9:55 AM · Restricted Project, Restricted Project

Wed, May 18

rampitec added inline comments to D124218: [LoadStoreVectorizer] Consider if operation is faster than before.
Wed, May 18, 10:30 AM · Restricted Project, Restricted Project
rampitec accepted D125907: [AMDGPU][MC][GFX8+] Correct SMEM offset parsing.
Wed, May 18, 10:20 AM · Restricted Project, Restricted Project
rampitec accepted D125888: [AMDGPU][MC][GFX940] Add SMFMAC aliases.

LGTM

Wed, May 18, 10:18 AM · Restricted Project, Restricted Project
rampitec added inline comments to D124217: [AMDGPU] Allow finer grain control of an unaligned access speed.
Wed, May 18, 12:52 AM · Restricted Project, Restricted Project

Tue, May 17

rampitec accepted D124508: [NFC][AMDGPU][CodeGen] Use ArrayRef in TargetLowering functions.

LGTM

Tue, May 17, 7:25 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124219: [AMDGPU] Fine tune LDS misaligned access speed.

Added comments about the values used.

Tue, May 17, 3:17 PM · Restricted Project, Restricted Project
rampitec added a comment to D124508: [NFC][AMDGPU][CodeGen] Use ArrayRef in TargetLowering functions.

Sorry for delay, thanks for doing this!
This is LGTM, except it needs a rebase: ISD::SCALAR_TO_VECTOR for Vec16 has changed since this was created.

Tue, May 17, 2:51 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124219: [AMDGPU] Fine tune LDS misaligned access speed.
Tue, May 17, 2:45 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124218: [LoadStoreVectorizer] Consider if operation is faster than before.

Renamed 'Fast' used in the file to 'RelativeSpeed'.

Tue, May 17, 1:04 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124217: [AMDGPU] Allow finer grain control of an unaligned access speed.

Rebased.

Tue, May 17, 1:03 PM · Restricted Project, Restricted Project
rampitec committed rGdee3190293fe: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic (authored by rampitec).
[AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic
Tue, May 17, 12:36 PM · Restricted Project, Restricted Project
rampitec closed D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.
Tue, May 17, 12:35 PM · Restricted Project, Restricted Project
rampitec updated the diff for D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.

Fixed rebase artifact with misplaced comment.

Tue, May 17, 12:19 PM · Restricted Project, Restricted Project
rampitec committed rGa09af8669396: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940 (authored by rampitec).
[AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940
Tue, May 17, 12:17 PM · Restricted Project, Restricted Project
rampitec closed D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.
Tue, May 17, 12:16 PM · Restricted Project, Restricted Project
rampitec added a comment to D114644: [AMDGPU] Aggressively fold immediates in SIShrinkInstructions.

I am strongly in favour of this change. On our target, the sgpr improvements that manifest themselves in reduced sgpr spilling outweighs the code size increase.

Tue, May 17, 12:06 PM · Restricted Project, Restricted Project
rampitec accepted D125803: [AMDGPU] Shrink F16 MAD/FMA to MADAK/MADMK/FMAAK/FMAMK on GFX10.

LGTM

Tue, May 17, 11:59 AM · Restricted Project, Restricted Project
rampitec updated the diff for D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.

Rebased.

Tue, May 17, 11:55 AM · Restricted Project, Restricted Project
rampitec accepted D125820: [AMDGPU] gfx11 LDSDIR instructions MC support.

LGTM with formatting fixed.

Tue, May 17, 11:53 AM · Restricted Project, Restricted Project
rampitec accepted D125811: [AMDGPU][MC][NFC] MUBUF code cleanup.
Tue, May 17, 11:05 AM · Restricted Project, Restricted Project
rampitec added a comment to D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.

ping

Tue, May 17, 11:03 AM · Restricted Project, Restricted Project
rampitec accepted D125799: [AMDGPU][MC][GFX7] Disable cache policy modifiers with SMEM.

LGTM

Tue, May 17, 11:00 AM · Restricted Project, Restricted Project
rampitec abandoned D125731: [AMDGPU] No need to wait before issuing LDS DMA.

Code was submitted as a part of D124884. Test was submitted separately.

Tue, May 17, 10:51 AM · Restricted Project, Restricted Project
rampitec committed rG2e2f3e33dff4: [AMDGPU] Add test for no waitcnt before issuing LDS DMA. NFC. (authored by rampitec).
[AMDGPU] Add test for no waitcnt before issuing LDS DMA. NFC.
Tue, May 17, 10:46 AM · Restricted Project, Restricted Project
rampitec accepted D125790: [AMDGPU][MC][GFX940] Correct tied operand decoding for smfmac opcodes.

LGTM

Tue, May 17, 10:43 AM · Restricted Project, Restricted Project
rampitec committed rG791ec1c68e3b: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds (authored by rampitec).
[AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds
Tue, May 17, 10:32 AM · Restricted Project, Restricted Project
rampitec closed D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 17, 10:32 AM · Restricted Project, Restricted Project
rampitec added inline comments to D125700: [AMDGPU][GFX9] Support base+soffset+offset SMEM loads..
Tue, May 17, 1:37 AM · Restricted Project, Restricted Project
rampitec added inline comments to D125700: [AMDGPU][GFX9] Support base+soffset+offset SMEM loads..
Tue, May 17, 12:15 AM · Restricted Project, Restricted Project

Mon, May 16

rampitec requested review of D125731: [AMDGPU] No need to wait before issuing LDS DMA.
Mon, May 16, 4:02 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.
Mon, May 16, 3:03 PM · Restricted Project, Restricted Project
rampitec updated the diff for D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.

Added comment about offset operand.

Mon, May 16, 2:52 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.
Mon, May 16, 2:45 PM · Restricted Project, Restricted Project
rampitec retitled D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic from [AMDGPU] Add llvm.amdgc.global.load.lds intrinsic to [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.
Mon, May 16, 2:40 PM · Restricted Project, Restricted Project
rampitec updated the diff for D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.

Changed asserts to cannot select.

Mon, May 16, 2:27 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Changed asserts to cannot select.

Mon, May 16, 2:17 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Mon, May 16, 2:13 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125700: [AMDGPU][GFX9] Support base+soffset+offset SMEM loads..
Mon, May 16, 2:03 PM · Restricted Project, Restricted Project
rampitec added a comment to D106408: Allow rematerialization of virtual reg uses.

@rampitec, any follow up on this patch?

Mon, May 16, 11:27 AM · Restricted Project, Restricted Project
rampitec added a reverting change for rGffbee7acdcaa: [AMDGPU][MC][GFX8][GFX9] Allow LDS direct reads for BUFFER_LOAD_DWORDX2/X3/X4: rG332b73fe12c6: [AMDGPU] Revert wide LDS DMA support..
Mon, May 16, 11:24 AM
rampitec added a reverting change for D47885: [AMDGPU][GFX8][GFX9] Allow LDS direct reads for DWORDX2/X3/X4: rG332b73fe12c6: [AMDGPU] Revert wide LDS DMA support..
Mon, May 16, 11:24 AM · Restricted Project, Restricted Project
rampitec committed rG332b73fe12c6: [AMDGPU] Revert wide LDS DMA support. (authored by rampitec).
[AMDGPU] Revert wide LDS DMA support.
Mon, May 16, 11:23 AM · Restricted Project, Restricted Project
rampitec closed D125409: [AMDGPU] Revert wide LDS DMA support..
Mon, May 16, 11:23 AM · Restricted Project, Restricted Project
rampitec added inline comments to D125700: [AMDGPU][GFX9] Support base+soffset+offset SMEM loads..
Mon, May 16, 10:19 AM · Restricted Project, Restricted Project

Fri, May 13

rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Fri, May 13, 1:58 PM · Restricted Project, Restricted Project
rampitec abandoned D125034: [AMDGPU] Add llvm.amdgcn.struct.buffer.load.lds intrinsic.

Struct version is now handled by the parent patch D124884 itself.

Fri, May 13, 1:57 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Switched to direct select which allows to use 2 separate memory operands.
The patch now handles both raw and struct intrinsics.

Fri, May 13, 1:56 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125567: [AMDGPU] Shrink MAD/FMA to MADAK/MADMK/FMAAK/FMAMK on GFX10.
Fri, May 13, 12:08 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125567: [AMDGPU] Shrink MAD/FMA to MADAK/MADMK/FMAAK/FMAMK on GFX10.
Fri, May 13, 12:07 PM · Restricted Project, Restricted Project
rampitec added inline comments to D125498: [AMDGPU] gfx11 scalar alu instructions.
Fri, May 13, 10:36 AM · Restricted Project, Restricted Project
rampitec updated the diff for D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.

Return false from getMemOperandsWithOffsetWidth() instead of checking mem operand.

Fri, May 13, 10:11 AM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Return false from getMemOperandsWithOffsetWidth() instead of checking mem operand.

Fri, May 13, 10:00 AM · Restricted Project, Restricted Project
rampitec added inline comments to D125409: [AMDGPU] Revert wide LDS DMA support..
Fri, May 13, 9:23 AM · Restricted Project, Restricted Project

Thu, May 12

rampitec added inline comments to D125498: [AMDGPU] gfx11 scalar alu instructions.
Thu, May 12, 2:29 PM · Restricted Project, Restricted Project
rampitec added a comment to D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.

ping

Thu, May 12, 9:46 AM · Restricted Project, Restricted Project

Wed, May 11

rampitec updated the diff for D125034: [AMDGPU] Add llvm.amdgcn.struct.buffer.load.lds intrinsic.

Removed support for wide than DWORD ops. See D125409.

Wed, May 11, 1:40 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Removed support for wide than DWORD ops. See D125409.

Wed, May 11, 1:39 PM · Restricted Project, Restricted Project
rampitec added a reverting change for rGffbee7acdcaa: [AMDGPU][MC][GFX8][GFX9] Allow LDS direct reads for BUFFER_LOAD_DWORDX2/X3/X4: D125409: [AMDGPU] Revert wide LDS DMA support..
Wed, May 11, 1:14 PM
rampitec requested review of D125409: [AMDGPU] Revert wide LDS DMA support..
Wed, May 11, 1:14 PM · Restricted Project, Restricted Project
rampitec added a reverting change for D47885: [AMDGPU][GFX8][GFX9] Allow LDS direct reads for DWORDX2/X3/X4: D125409: [AMDGPU] Revert wide LDS DMA support..
Wed, May 11, 1:14 PM · Restricted Project, Restricted Project

Tue, May 10

Herald added projects to D47885: [AMDGPU][GFX8][GFX9] Allow LDS direct reads for DWORDX2/X3/X4: Restricted Project, Restricted Project.

I do not understand how may this work. The LDS address has the component TID * 4. I.e. neighboring lanes shall overwrite each other. I can only imagine a scenario with a very specific EXEC mask where it might be different.

Tue, May 10, 4:08 PM · Restricted Project, Restricted Project
rampitec updated the diff for D125034: [AMDGPU] Add llvm.amdgcn.struct.buffer.load.lds intrinsic.

Do not split voffset because inst_offset is applied to both VMEM and LDS address and voffset is not. Add a separate operand instead.
Same as in parent change D124884.

Tue, May 10, 12:09 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Do not split voffset because inst_offset is applied to both VMEM and LDS address and voffset is not. Add a separate operand instead.

Tue, May 10, 11:47 AM · Restricted Project, Restricted Project

Mon, May 9

rampitec requested review of D125279: [AMDGPU] Add llvm.amdgcn.global.load.lds intrinsic.
Mon, May 9, 4:35 PM · Restricted Project, Restricted Project
rampitec added a comment to D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.

A potentially better alternative is to use gfx940 names with _LDS_ in the mnemonic instead of a modifier. This is logically a different opcode anyway. The only downside it is not compatible with the documentation and sp3. But then it was not implemented before and therefore not used, so there shall be no compatibility problem on practice. Well, it will also be different from MUBUF. Given the difference in both semantics and addressing mode I personally would prefer it to be different opcodes. At a pseudo level it is certainly easier to have separate ops for this.

Preferences?

It's probably better to have separate opcodes. In general I think the way we try to force all of these subtarget changes onto the same generic pseudos is more trouble than it's worth. It requires more and more code to verify and make use of the features, and it would be cleaner to move towards separate instruction definitions per subtarget

Mon, May 9, 10:20 AM · Restricted Project, Restricted Project

Fri, May 6

rampitec added a comment to D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.

One more thing to note: it is already incompatible with sp3 because we prohibit unused vdst, while sp3 enforces it.

Fri, May 6, 4:15 PM · Restricted Project, Restricted Project
rampitec added a comment to D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.

A potentially better alternative is to use gfx940 names with _LDS_ in the mnemonic instead of a modifier. This is logically a different opcode anyway. The only downside it is not compatible with the documentation and sp3. But then it was not implemented before and therefore not used, so there shall be no compatibility problem on practice. Well, it will also be different from MUBUF. Given the difference in both semantics and addressing mode I personally would prefer it to be different opcodes. At a pseudo level it is certainly easier to have separate ops for this.

Fri, May 6, 4:14 PM · Restricted Project, Restricted Project
rampitec accepted D124700: [AMDGPU] Add llvm.amdgcn.sched.barrier intrinsic.

LGTM

Fri, May 6, 2:27 PM · Restricted Project, Restricted Project, Restricted Project
rampitec added a comment to D125117: [AMDGPU][GFX10] Support base+soffset+offset SMEM loads..

I thought this was a GFX9 feature?

Fri, May 6, 2:04 PM · Restricted Project, Restricted Project
rampitec requested review of D125126: [AMDGPU] Enable FLAT LDS DMA on gfx9/10 before gfx940.
Fri, May 6, 1:33 PM · Restricted Project, Restricted Project
rampitec added a comment to D125060: [amdgpu][wip] Implement lds kernel id intrinsic.

As far as I understand this requires a whole program compilation and will not work with late linking?

Fri, May 6, 9:52 AM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Just to be clear , Is your expectation that intrinsic user to save and restore m0 before calling buffer_load lds intrinsic?

Fri, May 6, 9:47 AM · Restricted Project, Restricted Project

Thu, May 5

rampitec requested review of D125034: [AMDGPU] Add llvm.amdgcn.struct.buffer.load.lds intrinsic.
Thu, May 5, 12:02 PM · Restricted Project, Restricted Project

Wed, May 4

rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
  • Removed the overload and added i32 %size operand instead.
  • LDS pointer is i8 addrspace(3) now qualified with the address space.
  • Rebased on the change to handle hazards between m0 initialization and these operations.
Wed, May 4, 3:03 PM · Restricted Project, Restricted Project
rampitec committed rG63f21f4cc7bb: [AMDGPU] Handle LDS DMA and LDS_DIRECT hazards (authored by rampitec).
[AMDGPU] Handle LDS DMA and LDS_DIRECT hazards
Wed, May 4, 2:46 PM · Restricted Project, Restricted Project
rampitec closed D124550: [AMDGPU] Handle LDS DMA and LDS_DIRECT hazards.
Wed, May 4, 2:45 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Wed, May 4, 2:34 PM · Restricted Project, Restricted Project
rampitec added a comment to D124678: [AMDGPU] Allow for MFMA Inst Clustering.

LGTM, but please wait for Austin too.

Wed, May 4, 2:23 PM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

What's wrong with the idea of an i32 imm %size argument? That seems to me more in line with the philosophy of caring less about types.

I'd prefer to keep any intrinsics that look like a load or store to look more like the regular load or store instructions. All of these arbitrary immediate parameters are uglier (e.g. the memory ordering arguments that don't actually work on some of the atomics)

Wed, May 4, 12:42 PM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

To confirm: is that OK to add yet another imm to the end of operands of the intrinsic to select a byte size? And then remove the overload. If yes I will do it tomorrow.

There's the elementtype attribute for this case which some arm intrinsics seem to be using. Not sure how you're supposed to define an intrinsic to use it though

Wed, May 4, 12:42 PM · Restricted Project, Restricted Project

Tue, May 3

rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

To confirm: is that OK to add yet another imm to the end of operands of the intrinsic to select a byte size? And then remove the overload. If yes I will do it tomorrow.

Tue, May 3, 5:03 PM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

To confirm: is that OK to add yet another imm to the end of operands of the intrinsic to select a byte size? And then remove the overload. If yes I will do it tomorrow.

Tue, May 3, 5:02 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:44 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:33 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:24 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:20 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:15 PM · Restricted Project, Restricted Project
rampitec updated the diff for D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:15 PM · Restricted Project, Restricted Project
rampitec added inline comments to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.
Tue, May 3, 4:12 PM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

Why does this need an intrinsic? I thought the whole point of the LDS DMA thing was an optimization the backend would perform and doesn't need to be exposed directly

Tue, May 3, 3:16 PM · Restricted Project, Restricted Project
rampitec added a comment to D124884: [AMDGPU] Add intrinsics llvm.amdgcn.{raw|struct}.buffer.load.lds.

It will also need to be rebased on top of D124550 to handle hazard between M0 initialization and LDS DMA.

Tue, May 3, 3:06 PM · Restricted Project, Restricted Project