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[docs] add early Arm arch support improvements to release notes
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Authored by stuij on Jan 20 2023, 9:05 AM.

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peter.smith
pratlucas

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rGb1d1a1a59243: [docs] add early Arm arch support improvements to release notes

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Repository: rG LLVM Github Monorepo

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stuij created this revision.Jan 20 2023, 9:05 AM

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stuij added reviewers: peter.smith, pratlucas.Jan 20 2023, 9:06 AM

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tschuett added inline comments.

llvm/docs/ReleaseNotes.rst
135	Armv4

fix typo

stuij marked an inline comment as done.Jan 20 2023, 9:18 AM

Harbormaster completed remote builds in B209018: Diff 490891.Jan 20 2023, 11:47 AM

I think this is pretty close. I think we shouldn't claim full support for Armv4 as we don't support the R_ARMV4BX relocation yet.

llvm/docs/ReleaseNotes.rst
133	Sadly I think we'll need to drop full support for Armv4 as we are missing support for the R_ARM_V4BX relocation (https://github.com/llvm/llvm-project/blob/main/lld/ELF/Arch/ARM.cpp#L166) . This isn't important for clang as it uses mov pc,lr when compiling for -march=armv4, but it is possible that some GNU input objects will have bx lr along with a R_ARM_V4BX relocation. I suggest Added Armv4 and Armv4T compatible thunks. LLD will no longer generate BX instructions for Armv4 or BLX instructions for either Armv4 or Armv4T. Armv4T is now fully supported.

rephrasing after review comment

stuij marked an inline comment as done.Jan 23 2023, 7:27 AM

stuij added inline comments.

llvm/docs/ReleaseNotes.rst
133	Thanks! Done.

Thanks for the update, LGTM.

This revision is now accepted and ready to land.Jan 23 2023, 7:38 AM

This revision was landed with ongoing or failed builds.Jan 23 2023, 8:12 AM

Closed by commit rGb1d1a1a59243: [docs] add early Arm arch support improvements to release notes (authored by stuij). · Explain Why

This revision was automatically updated to reflect the committed changes.

stuij marked an inline comment as done.

stuij added a commit: rGb1d1a1a59243: [docs] add early Arm arch support improvements to release notes.

Harbormaster completed remote builds in B209374: Diff 491370.Jan 23 2023, 9:40 AM

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ReleaseNotes.rst

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llvm/docs/ReleaseNotes.rst

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	* Added support for assembly for RME MEC (Memory Encryption Contexts).			* Added support for assembly for RME MEC (Memory Encryption Contexts).

	Changes to the AMDGPU Backend			Changes to the AMDGPU Backend
	-----------------------------			-----------------------------

	Changes to the ARM Backend			Changes to the ARM Backend
	--------------------------			--------------------------

	* Support for targeting armv2, armv2A, armv3 and armv3M has been removed.			* Support for targeting Armv2, Armv2A, Armv3 and Armv3M has been removed.
	LLVM did not, and was not ever likely to generate correct code for those			LLVM did not, and was not ever likely to generate correct code for those
	architecture versions so their presence was misleading.			architecture versions so their presence was misleading.
				* Added Armv4 and Armv4T compatible thunks. LLD will no longer generate BX
				peter.smithUnsubmitted Done Reply Inline Actions Sadly I think we'll need to drop full support for Armv4 as we are missing support for the R_ARM_V4BX relocation (https://github.com/llvm/llvm-project/blob/main/lld/ELF/Arch/ARM.cpp#L166) . This isn't important for clang as it uses mov pc,lr when compiling for -march=armv4, but it is possible that some GNU input objects will have bx lr along with a R_ARM_V4BX relocation. I suggest Added Armv4 and Armv4T compatible thunks. LLD will no longer generate BX instructions for Armv4 or BLX instructions for either Armv4 or Armv4T. Armv4T is now fully supported. peter.smith: Sadly I think we'll need to drop full support for Armv4 as we are missing support for the…
				stuijAuthorUnsubmitted Done Reply Inline Actions Thanks! Done. stuij: Thanks! Done.
				instructions for Armv4 or BLX instructions for either Armv4 or Armv4T. Armv4T
				is now fully supported.
				tschuettUnsubmitted Done Reply Inline Actions Armv4 tschuett: Armv4
				* Added compiler-rt builtins support for Armv4T, Armv5TE and Armv6.

	Changes to the AVR Backend			Changes to the AVR Backend
	--------------------------			--------------------------

	* ...			* ...

	Changes to the DirectX Backend			Changes to the DirectX Backend
	------------------------------			------------------------------
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