[AArch64] Add FEAT_SME_B16B16 and remove FEAT_B16B16 (#102501) Implement FEAT_SME_B16B16 to enable ZA-targeting non-widening SME BFloat16 instructions. Remove the now redundant FEAT_B16B16 which has been replaced by FEAT_SVE_B16B16 and FEAT_SME_B16B16 (this commit), see https://github.com/llvm/llvm-project/pull/101480/ for the details and reasoning of this change to LLVM. FEAT_SME_B16B16 is documented under the latest Armv9.4 feature documentation: https://developer.arm.com/documentation/109697/0100/Feature-descriptions/The-Armv9-4-architecture-extensio - Changes to Clang AArch64 frontend - Change target guard of SME2 ZA-targeting non-widening BFloat16 intrinsics to 'sme-b16b16' - Changes to LLVM AArch64 backend - llvm/lib/Target/AArch64/AArch64Features.td - Create FeatureSMEB16B16, which implies FeatureSME2 and FeatureSVEB16B16 - Remove FeatureB16B16 - Fix description of FeatureSVEB16B16 - llvm/lib/Target/AArch64/AArch64InstrInfo.td - Create HasSMEB16B16 predicate - llvm/lib/Target/AArch64/AArch64SMEInstrInfo.td - Change predictication of SME2 ZA-targeting non-widening BFloat16 instructions to new HasSMEB16B16 - llvm/lib/Target/AArch64/AArch64.td - Add HasSMEB16B16 to SME2Unsupported (FEAT_SME_B16B16 implies FEAT_SME2) - llvm/lib/AArch64/AsmParser/AArch64AsmParser.cpp - Remove flag 'b16b16' mapping to removed FeatureB16B16 - Add flag 'sme-b16b16' mapping to new FeatureSMEB16B16 - Changes to LLVM unit tests - llvm/unittests/TargetParser/TargetParserTest.cpp - Add new sme-b16b16 flag to existing target parser tests - Add tests for the sme-b16b16 dependencies: - 'sme-b16b16' should enable 'sme2', 'sve-b16b16'. - Remove 'b16b16' from bf16 dependency test - Added MC tests - llvm/test/MC/AArch64/SME2p1 - To ensure that ZA-targeting multi-vector non-widening BFloat16 instructions are enabled by +sme-b16b16, and that this feature is removed by +nosme-b61b6. - Modidified tests - All CodeGen, Semantic, and MC tests that are effected by the removal of 'b16b16', have been modified to supply and/or expect 'sme-b16b16' where appropriate.
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