Sander de Smalen ecb7b9c5c5 [Clang][AArch64] Diagnostics for SME attributes when target doesn't have 'sme' ...

This patch adds error diagnostics to Clang when code uses the AArch64 SME
attributes without specifying 'sme' as available target attribute.

* Function definitions marked as '__arm_streaming', '__arm_locally_streaming',
  '__arm_shared_za' or '__arm_new_za' will by definition use or require SME
  instructions.
* Calls from non-streaming functions to streaming-functions require
  the compiler to enable/disable streaming-SVE mode around the call-site.

In some cases we can accept the SME attributes without having 'sme' enabled:
* Function declaration can have the SME attributes.
* Definitions can be __arm_streaming_compatible since the generated
  code should execute on processing elements without SME.

Reviewed By: paulwalker-arm

Differential Revision: https://reviews.llvm.org/D157269

2023-08-09 12:31:02 +00:00

33 KiB

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