================
@@ -150,3 +153,137 @@ void
AArch64::PrintSupportedExtensions(StringMap<StringRef> DescMap) {
}
}
}
+
+const llvm::AArch64::ExtensionInfo &
+lookupExtensionByID(llvm::AArch64::ArchExtKind ExtID) {
+ for (const auto &E : llvm::AArch64::Extensions)
+ if (E.ID == ExtID)
+ return E;
+ assert(false && "Invalid extension ID");
+}
+
+void AArch64::ExtensionSet::enable(ArchExtKind E) {
+ if (Enabled.test(E))
+ return;
+
+ LLVM_DEBUG(llvm::dbgs() << "Enable " << lookupExtensionByID(E).Name << "\n");
+
+ Touched.set(E);
+ Enabled.set(E);
+
+ // Recursively enable all features that this one depends on. This handles all
+ // of the simple cases, where the behaviour doesn't depend on the base
+ // architecture version.
+ for (auto Dep : ExtensionDependencies)
+ if (E == Dep.Later)
+ enable(Dep.Earlier);
----------------
tmatheson-arm wrote:
One concern I have is that `ExtensionDependencies` expresses the dependencies
as a directed graph, but in reality we probably just want a tree, as this code
assumes.
https://github.com/llvm/llvm-project/pull/78270
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