[all-commits] [llvm/llvm-project] 02cafa: [AArch64] Adopt updated B16B16 target flags

[SpencerAbson via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 02cafa895c917a4b1726e64a5870877c95826be4
      https://github.com/llvm/llvm-project/commit/02cafa895c917a4b1726e64a5870877c95826be4
  Author: Spencer Abson <Spencer.Abson at arm.com>
  Date:   2024-08-19 (Mon, 19 Aug 2024)

  Changed paths:
    M clang/include/clang/Basic/arm_sve.td
    M clang/test/Driver/print-supported-extensions-aarch64.c
    M llvm/lib/Target/AArch64/AArch64Features.td
    M llvm/unittests/TargetParser/TargetParserTest.cpp

  Log Message:
  -----------
  [AArch64] Adopt updated B16B16 target flags

The enablement of SVE/SME non-widening BFloat16 instructions was recently
changed in response to an architecture update, in which:
	- FEAT_SVE_B16B16 was weakened
	- FEAT_SME_B16B16 was introduced
New flags, 'sve-b16b16' and 'sme-b16b16' were introduced to replace the
existing 'b16b16'. This was acheived in the below two patches.
	- https://github.com/llvm/llvm-project/pull/101480
	- https://github.com/llvm/llvm-project/pull/102501
Ideally, the interface change introduced here will be valid in LLVM-19.
We do not see it necessary to back-port the entire change, but just to add
'sme-b16b16' and 'sve-b16b16' as aliases to the existing (and unchanged)
'b16b16' and 'sme2' flags which together cover all of these features.

The predication of Bf16 variants of svmin/svminnm and svmax/svmaxnm is also
fixed in this change.



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