[all-commits] [llvm/llvm-project] b00c36: [AArch64][SME] Implement ABI for calls to/from str...

[sdesmalen-arm via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b00c36c2958b250ce6031a9b9776b3011fae4f33
      https://github.com/llvm/llvm-project/commit/b00c36c2958b250ce6031a9b9776b3011fae4f33
  Author: Sander de Smalen <sander.desmalen at arm.com>
  Date:   2022-09-16 (Fri, 16 Sep 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64CallingConvention.td
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.h
    M llvm/lib/Target/AArch64/AArch64RegisterInfo.td
    M llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td
    A llvm/test/CodeGen/AArch64/sme-streaming-interface.ll

  Log Message:
  -----------
  [AArch64][SME] Implement ABI for calls to/from streaming functions.

This patch implements the ABI for calls from:

  Normal -> Streaming
  Normal -> Streaming-compatible
  Streaming -> Normal
  Streaming -> Streaming-compatible
  Streaming -> Streaming

The compiler inserts SMSTART/SMSTOP instructions before and after the call,
depending on the required transition.

More details about the SME attributes and design can be found
in D131562.

Reviewed By: aemerson

Differential Revision: https://reviews.llvm.org/D131576