[clang] [llvm] [ARM] [AArch32] Add support for Arm China STAR-MC1 CPU (PR #110085)

[Jonathan Thackray via llvm-commits]

================
@@ -362,6 +362,16 @@ def : ProcessorModel<"cortex-m33", CortexM4Model,       [ARMv8mMainline,
                                                          FeatureHasNoBranchPredictor,
                                                          FeatureFixCMSE_CVE_2021_35465]>;
 
+def : ProcessorModel<"star-mc1", CortexM4Model,         [ARMv8mMainline,
+                                                         FeatureDSP,
+                                                         FeatureFPARMv8_D16_SP,
+                                                         FeaturePrefLoopAlign32,
+                                                         FeatureHasSlowFPVMLx,
+                                                         FeatureHasSlowFPVFMx,
+                                                         FeatureUseMISched,
+                                                         FeatureHasNoBranchPredictor,
+                                                         FeatureFixCMSE_CVE_2021_35465]>;
----------------
jthackray wrote:

Could you add the following to `llvm/test/CodeGen/ARM/cmse-cve-2021-35465.ll`:
```
; RUN: llc %s -o - -mtriple=thumbv8m.main -mcpu=star-mc1 -verify-machineinstrs | \
; RUN:   FileCheck %s --check-prefix=CHECK-8M-FP-CVE-2021-35465

; RUN: llc %s -o - -mtriple=thumbv8m.main -mcpu=star-mc1 -mattr=-fpregs -verify-machineinstrs | \
; RUN:   FileCheck %s --check-prefix=CHECK-8M-NOFP-CVE-2021-35465
```

https://github.com/llvm/llvm-project/pull/110085