[ARM][AArch64] Cortex-A75 and Cortex-A55 tests

Add frontend tests for Cortex-A75 and Cortex-A55, Arm's latest
big.LITTLE A-class cores. They implement the ARMv8.2-A architecture,
including the cryptography and RAS extensions, plus the optional dot
product extension. They also implement the RCpc AArch64 extension
from ARMv8.3-A.

Cortex-A75:
https://developer.arm.com/products/processors/cortex-a/cortex-a75

Cortex-A55:
https://developer.arm.com/products/processors/cortex-a/cortex-a55

Differential Revision: https://reviews.llvm.org/D36731


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311319 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/Driver/ToolChains/Arch/ARM.cpp b/lib/Driver/ToolChains/Arch/ARM.cpp
index 49bb23535d..a5d63557f4 100644
--- a/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -87,6 +87,15 @@ static bool DecodeARMFeatures(const Driver &D, StringRef text,
   return true;
 }
 
+static void DecodeARMFeaturesFromCPU(const Driver &D, StringRef CPU,
+                                     std::vector<StringRef> &Features) {
+  if (CPU != "generic") {
+    llvm::ARM::ArchKind ArchKind = llvm::ARM::parseCPUArch(CPU);
+    unsigned Extension = llvm::ARM::getDefaultExtensions(CPU, ArchKind);
+    llvm::ARM::getExtensionFeatures(Extension, Features);
+  }
+}
+
 // Check if -march is valid by checking if it can be canonicalised and parsed.
 // getARMArch is used here instead of just checking the -march value in order
 // to handle -march=native correctly.
@@ -331,6 +340,8 @@ void arm::getARMTargetFeatures(const ToolChain &TC,
       for (auto &F : HostFeatures)
         Features.push_back(
             Args.MakeArgString((F.second ? "+" : "-") + F.first()));
+  } else if (!CPUName.empty()) {
+    DecodeARMFeaturesFromCPU(D, CPUName, Features);
   }
 
   // Honor -mfpu=. ClangAs gives preference to -Wa,-mfpu=.