[clang] [llvm] [AArch64] Add support for C1 CPUs (PR #171124)

[David Green via llvm-commits]

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@@ -973,6 +1046,36 @@ def ProcessorFeatures {
                                  FeatureDotProd, FeatureFPARMv8, FeatureFullFP16, FeatureMatMulInt8,
                                  FeatureJS, FeatureLSE, FeatureNEON, FeaturePAuth, FeatureRAS,
                                  FeatureRCPC, FeatureRDM, FeatureFPAC];
+  list<SubtargetFeature> C1Ultra = [HasV9_3aOps, FeatureNEON, FeatureCLRBHB,
+                                    FeatureCHK, FeatureFPARMv8, FeaturePerfMon,
+                                    FeatureSPECRES2, FeatureSSBS, FeatureRDM,
+                                    FeatureVH, FeatureBF16, FeatureDotProd,
+                                    FeatureFP16FML, FeatureFullFP16,
+                                    FeatureMPAM, FeatureSPE, FeatureSVE,
+                                    FeatureCCIDX, FeatureComplxNum, FeatureFPAC,
+                                    FeatureJS, FeatureAM, FeatureRAS,
+                                    FeatureSEL2, FeatureTRACEV8_4,
+                                    FeatureAltFPCmp, FeatureFRInt3264,
+                                    FeatureMTE, FeatureFineGrainedTraps,
+                                    FeatureHCX, FeatureSPE_EEF, FeatureRCPC3,
+                                    FeatureETE, FeatureSVEBitPerm, FeatureSVE2,
+                                    FeatureTRBE, FeatureSME, FeatureSME2];
+  list<SubtargetFeature> C1Premium = [HasV9_3aOps, FeatureNEON, FeatureCLRBHB,
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davemgreen wrote:

C1Premium < C1Ultra. (Although you could just reuse the same list for both).

https://github.com/llvm/llvm-project/pull/171124