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

STAR-MC1 is an Armv8m CPU.

Technical specifications available at:

https://www.armchina.com/download/Documents/Application-Notes/Technical-Reference-Manual?infoId=160

Author: AlbertHuang-CPU

clang/test/Driver/arm-cortex-cpus-2.c

@@ -559,8 +559,10 @@
 // CHECK-CPUV8MBASE:  "-cc1"{{.*}} "-triple" "thumbv8m.base-
 
 // RUN: %clang -target arm -mcpu=cortex-m33 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-M33 %s
+// RUN: %clang -target arm -mcpu=star-mc1 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-STAR-MC1 %s
 // RUN: %clang -target arm -mcpu=cortex-m35p -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-M35P %s
 // CHECK-CORTEX-M33:  "-cc1"{{.*}} "-triple" "thumbv8m.main-{{.*}} "-target-cpu" "cortex-m33"
+// CHECK-STAR-MC1:  "-cc1"{{.*}} "-triple" "thumbv8m.main-{{.*}} "-target-cpu" "star-mc1"
 // CHECK-CORTEX-M35P:  "-cc1"{{.*}} "-triple" "thumbv8m.main-{{.*}} "-target-cpu" "cortex-m35p"
 
 // RUN: %clang -target arm -mcpu=cortex-m55 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-CORTEX-M55 %s

clang/test/Misc/target-invalid-cpu-note/arm.c

@@ -65,6 +65,7 @@
 // CHECK-SAME: {{^}}, cortex-m7
 // CHECK-SAME: {{^}}, cortex-m23
 // CHECK-SAME: {{^}}, cortex-m33
+// CHECK-SAME: {{^}}, star-mc1
 // CHECK-SAME: {{^}}, cortex-m35p
 // CHECK-SAME: {{^}}, cortex-m55
 // CHECK-SAME: {{^}}, cortex-m85

llvm/include/llvm/TargetParser/ARMTargetParser.def

@@ -342,6 +342,7 @@ ARM_CPU_NAME("cortex-m4", ARMV7EM, FK_FPV4_SP_D16, true, ARM::AEK_NONE)
 ARM_CPU_NAME("cortex-m7", ARMV7EM, FK_FPV5_D16, false, ARM::AEK_NONE)
 ARM_CPU_NAME("cortex-m23", ARMV8MBaseline, FK_NONE, false, ARM::AEK_NONE)
 ARM_CPU_NAME("cortex-m33", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
+ARM_CPU_NAME("star-mc1", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
 ARM_CPU_NAME("cortex-m35p", ARMV8MMainline, FK_FPV5_SP_D16, false, ARM::AEK_DSP)
 ARM_CPU_NAME("cortex-m55", ARMV8_1MMainline, FK_FP_ARMV8_FULLFP16_D16, false,
              (ARM::AEK_DSP | ARM::AEK_SIMD | ARM::AEK_FP | ARM::AEK_FP16))

llvm/lib/Target/ARM/ARMProcessors.td

@@ -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,
+                                                         FeaturePreferBranchAlign32,
+                                                         FeatureHasSlowFPVMLx,
+                                                         FeatureHasSlowFPVFMx,
+                                                         FeatureUseMISched,
+                                                         FeatureHasNoBranchPredictor,
+                                                         FeatureFixCMSE_CVE_2021_35465]>;
+
 def : ProcessorModel<"cortex-m35p", CortexM4Model,      [ARMv8mMainline,
                                                          FeatureDSP,
                                                          FeatureFPARMv8_D16_SP,

llvm/lib/TargetParser/Host.cpp

@@ -342,6 +342,12 @@ StringRef sys::detail::getHostCPUNameForARM(StringRef ProcCpuinfoContent) {
     }
   }
 
+  if (Implementer == "0x63") { // Arm China.
+    return StringSwitch<const char *>(Part)
+        .Case("0x132", "star-mc1")
+        .Default("generic");
+  }
+
   if (Implementer == "0x6d") { // Microsoft Corporation.
     // The Microsoft Azure Cobalt 100 CPU is handled as a Neoverse N2.
     return StringSwitch<const char *>(Part)

llvm/test/CodeGen/ARM/cmse-cve-2021-35465.ll

@@ -7,6 +7,9 @@
 ; RUN: llc %s -o - -mtriple=thumbv8m.main -mcpu=cortex-m33 -verify-machineinstrs | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-8M-FP-CVE-2021-35465
 ;
+; 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=cortex-m35p -verify-machineinstrs | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-8M-FP-CVE-2021-35465
 ;
@@ -17,6 +20,9 @@
 ; RUN: llc %s -o - -mtriple=thumbv8m.main -mcpu=cortex-m33 -mattr=-fpregs -verify-machineinstrs | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-8M-NOFP-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
+;
 ; RUN: llc %s -o - -mtriple=thumbv8m.main -mcpu=cortex-m35p -mattr=-fpregs -verify-machineinstrs | \
 ; RUN:   FileCheck %s --check-prefix=CHECK-8M-NOFP-CVE-2021-35465
 ;

llvm/unittests/TargetParser/TargetParserTest.cpp

@@ -490,6 +490,9 @@ INSTANTIATE_TEST_SUITE_P(
         ARMCPUTestParams<uint64_t>("cortex-m33", "armv8-m.main", "fpv5-sp-d16",
                                    ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP,
                                    "8-M.Mainline"),
+        ARMCPUTestParams<uint64_t>("star-mc1", "armv8-m.main", "fpv5-sp-d16",
+                                   ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP,
+                                   "8-M.Mainline"),
         ARMCPUTestParams<uint64_t>("cortex-m35p", "armv8-m.main", "fpv5-sp-d16",
                                    ARM::AEK_HWDIVTHUMB | ARM::AEK_DSP,
                                    "8-M.Mainline"),
@@ -518,7 +521,7 @@ INSTANTIATE_TEST_SUITE_P(
                                    "7-S")),
     ARMCPUTestParams<uint64_t>::PrintToStringParamName);
 
-static constexpr unsigned NumARMCPUArchs = 92;
+static constexpr unsigned NumARMCPUArchs = 93;
 
 TEST(TargetParserTest, testARMCPUArchList) {
   SmallVector<StringRef, NumARMCPUArchs> List;