Xtensa architecture support in LLVM

Ivan Grokhotkov <ivan@...>


Since Zephyr RTOS includes support for the Xtensa architecture, I'd like to bring attention to the Xtensa LLVM backend, which is currently in review on LLVM Phabircator. This backend was developed by Espressif, with the initial targets being ESP8266 and ESP32 chips.
As some of the Zephyr developers (mainly from Intel) have access to the Xtensa architecture documentation, we would like to ask for reviews on this series of patches.
I think having Xtensa supported in LLVM would also be beneficial for the Zephyr project, as the LLVM backend allows adding new Xtensa core configurations in a much more straightforward way, compared to GCC.

Links to the patch series:

D64826: [Xtensa 1/10] Recognize Xtensa in triple parsing code. https://reviews.llvm.org/D64826
D64827: [Xtensa 2/10] Add Xtensa ELF definitions. https://reviews.llvm.org/D64827
D64829: [Xtensa 3/10] Add initial version of the Xtensa backend. https://reviews.llvm.org/D64829
D64830: [Xtensa 4/10] Add basic *td files with Xtensa architecture description. https://reviews.llvm.org/D64830
D64831: [Xtensa 5/10] Add Xtensa MCTargetDescr initial functionality. https://reviews.llvm.org/D64831
D64832: [Xtensa 6/10] Add Xtensa basic assembler parser. https://reviews.llvm.org/D64832
D64833: [Xtensa 7/10] Add Xtensa instruction printer. https://reviews.llvm.org/D64833
D64834: [Xtensa 8/10] Add support of the Xtensa shift/load/store/move and processor control instructions. https://reviews.llvm.org/D64834
D64835: [Xtensa 9/10] Add basic support of Xtensa disassembler. https://reviews.llvm.org/D64835
D64836: [Xtensa 10/10] Add relaxations and fixups. Add rest part of Xtensa Core Instructions. https://reviews.llvm.org/D64836

The patches are maintained at https://github.com/espressif/llvm-project. This repository can also be used to submit issues.

Thank you,
Ivan Grokhotkov
Espressif Systems

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