[clang] [AArch64] Add getHostCPUFeatures to query for enabled features in cpu… (PR #97749)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (neildhickey)

<details>
<summary>Changes</summary>

…info

This pull request adds code to call getHostCPUInfo into the AArch64 Target Parser to query the cpuinfo for the device in the case where we are compiling with -mcpu=native

---
Full diff: https://github.com/llvm/llvm-project/pull/97749.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Arch/AArch64.cpp (+17) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
index ec248b80251ea3..2862c297622fa9 100644
--- a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -445,4 +445,21 @@ void aarch64::getAArch64TargetFeatures(const Driver &D,
 
   if (Args.getLastArg(options::OPT_mno_bti_at_return_twice))
     Features.push_back("+no-bti-at-return-twice");
+
+  // Parse AArch64 CPU Features
+  const Arg *CPUArg = Args.getLastArg(options::OPT_mcpu_EQ);
+  StringRef CPUName;
+
+  if (CPUArg) {
+    CPUName = CPUArg->getValue();
+    if (CPUName == "native") {
+      llvm::StringMap<bool> HostFeatures;
+      if (llvm::sys::getHostCPUFeatures(HostFeatures)) {
+        for (auto &F : HostFeatures) {
+          Features.push_back(
+            Args.MakeArgString((F.second ? "+" : "-") + F.first()));
+        }
+      }
+    }
+  }
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/97749