[COFF, ARM64] Add _ReadStatusReg and_WriteStatusReg intrinsics
Reviewers: rnk, compnerd, mstorsjo, efriedma, TomTan, haripul, javed.absar
Reviewed By: efriedma
Subscribers: dmajor, kristof.beyls, chrib, cfe-commits
Differential Revision: https://reviews.llvm.org/D53115
llvm-svn: 344765
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 54d9fbb..7d0ec81 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -6667,6 +6667,43 @@
return EmitSpecialRegisterBuiltin(*this, E, RegisterType, ValueType, IsRead);
}
+ if (BuiltinID == AArch64::BI_ReadStatusReg ||
+ BuiltinID == AArch64::BI_WriteStatusReg) {
+ LLVMContext &Context = CGM.getLLVMContext();
+
+ unsigned SysReg =
+ E->getArg(0)->EvaluateKnownConstInt(getContext()).getZExtValue();
+
+ std::string SysRegStr;
+ llvm::raw_string_ostream(SysRegStr) <<
+ ((1 << 1) | ((SysReg >> 14) & 1)) << ":" <<
+ ((SysReg >> 11) & 7) << ":" <<
+ ((SysReg >> 7) & 15) << ":" <<
+ ((SysReg >> 3) & 15) << ":" <<
+ ( SysReg & 7);
+
+ llvm::Metadata *Ops[] = { llvm::MDString::get(Context, SysRegStr) };
+ llvm::MDNode *RegName = llvm::MDNode::get(Context, Ops);
+ llvm::Value *Metadata = llvm::MetadataAsValue::get(Context, RegName);
+
+ llvm::Type *RegisterType = Int64Ty;
+ llvm::Type *ValueType = Int32Ty;
+ llvm::Type *Types[] = { RegisterType };
+
+ if (BuiltinID == AArch64::BI_ReadStatusReg) {
+ llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::read_register, Types);
+ llvm::Value *Call = Builder.CreateCall(F, Metadata);
+
+ return Builder.CreateTrunc(Call, ValueType);
+ }
+
+ llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::write_register, Types);
+ llvm::Value *ArgValue = EmitScalarExpr(E->getArg(1));
+ ArgValue = Builder.CreateZExt(ArgValue, RegisterType);
+
+ return Builder.CreateCall(F, { Metadata, ArgValue });
+ }
+
// Find out if any arguments are required to be integer constant
// expressions.
unsigned ICEArguments = 0;