[all-commits] [llvm/llvm-project] d508f0: [AArch64] Fix FPMR handling when switching streami...

[Lukacma via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d508f0cb009a0be98ca97f4dc0498294e0681a66
      https://github.com/llvm/llvm-project/commit/d508f0cb009a0be98ca97f4dc0498294e0681a66
  Author: Lukacma <Marian.Lukac at arm.com>
  Date:   2025-04-16 (Wed, 16 Apr 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    A llvm/test/CodeGen/AArch64/sme-write-fpmr.ll

  Log Message:
  -----------
  [AArch64] Fix FPMR handling when switching streaming mode (#135827)

According to the
[documentation](https://developer.arm.com/documentation/ddi0601/latest/AArch64-Registers/FPMR--Floating-point-Mode-Register),
the FPMR register is set to 0 when entering or exiting streaming mode.
This patch models that behavior by adding FPMR as an implicit def to the
instructions used for entering and exiting streaming mode.



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