[all-commits] [llvm/llvm-project] d4d81a: [AArch64][SME2] Extend SMEABIPass to handle functi...

[Kerry McLaughlin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d4d81acb52bd44681210001c148ac86df8a344f0
      https://github.com/llvm/llvm-project/commit/d4d81acb52bd44681210001c148ac86df8a344f0
  Author: Kerry McLaughlin <kerry.mclaughlin at arm.com>
  Date:   2024-01-22 (Mon, 22 Jan 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/SMEABIPass.cpp
    M llvm/lib/Target/AArch64/Utils/AArch64SMEAttributes.cpp
    M llvm/lib/Target/AArch64/Utils/AArch64SMEAttributes.h
    M llvm/test/CodeGen/AArch64/sme-zt0-state.ll

  Log Message:
  -----------
  [AArch64][SME2] Extend SMEABIPass to handle functions with new ZT0 state (#78848)

updateNewZAFunctions is extended to generate the following on entry to a
function with either the "aarch64_pstate_za_new" or "arm_new_zt0"
attribute:
- Private-ZA interface: commit any active lazy-saves & enable PSTATE.ZA.
  - "aarch64_pstate_za_new": zero ZA.
  - "arm_new_zt0": zero ZT0.

Additionally, PSTATE.ZA should disabled before returning if the function
has a private-ZA interface.