[COFF, ARM64] Add __getReg intrinsic
Reviewers: rnk, mstorsjo, compnerd, TomTan, haripul, javed.absar, efriedma
Reviewed By: efriedma
Subscribers: peter.smith, efriedma, kristof.beyls, chrib, cfe-commits
Differential Revision: https://reviews.llvm.org/D52838
llvm-svn: 343824
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 49c2b12..b59fa37 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -6576,6 +6576,23 @@
return Builder.CreateCall(F, {StoreVal, StoreAddr}, "stxr");
}
+ if (BuiltinID == AArch64::BI__getReg) {
+ APSInt Value;
+ if (!E->getArg(0)->EvaluateAsInt(Value, CGM.getContext()))
+ llvm_unreachable("Sema will ensure that the parameter is constant");
+
+ LLVMContext &Context = CGM.getLLVMContext();
+ std::string Reg = Value == 31 ? "sp" : "x" + Value.toString(10);
+
+ llvm::Metadata *Ops[] = {llvm::MDString::get(Context, Reg)};
+ llvm::MDNode *RegName = llvm::MDNode::get(Context, Ops);
+ llvm::Value *Metadata = llvm::MetadataAsValue::get(Context, RegName);
+
+ llvm::Value *F =
+ CGM.getIntrinsic(llvm::Intrinsic::read_register, {Int64Ty});
+ return Builder.CreateCall(F, Metadata);
+ }
+
if (BuiltinID == AArch64::BI__builtin_arm_clrex) {
Function *F = CGM.getIntrinsic(Intrinsic::aarch64_clrex);
return Builder.CreateCall(F);