Add get_threadlocal_offset intrinsic

This intrinsic will be used in the ThreadLocalLowering pass to bypass a dependency issue with LinearMemoryHelper.

Author: Maqrkk

llvm/include/llvm/IR/IntrinsicsCheerp.td

@@ -105,6 +105,9 @@ def int_cheerp_get_thread_pointer : Intrinsic<[llvm_i32_ty]>;
 def int_cheerp_set_thread_pointer : Intrinsic<[],
                                       [llvm_i32_ty]>;
 
+def int_cheerp_get_threadlocal_offset : Intrinsic<[llvm_i32_ty],
+                                          [llvm_anyptr_ty]>;
+
 def int_cheerp_atomic_wait : Intrinsic<[llvm_i32_ty],
                               [llvm_ptr_ty, llvm_i32_ty, llvm_i64_ty]>,
                               ClangBuiltin<"__builtin_cheerp_atomic_wait">;

llvm/lib/CheerpWriter/CheerpWriter.cpp

@@ -1088,6 +1088,17 @@ CheerpWriter::COMPILE_INSTRUCTION_FEEDBACK CheerpWriter::handleBuiltinCall(const
 		compileOperand(*it);
 		return COMPILE_OK;
 	}
+	else if(intrinsicId==Intrinsic::threadlocal_address)
+	{
+		llvm::report_fatal_error("Encountered threadlocal_address in writer");
+	}
+	else if(intrinsicId==Intrinsic::cheerp_get_threadlocal_offset)
+	{
+		const GlobalVariable* GV = dyn_cast<GlobalVariable>(callV.getOperand(0));
+		int32_t offset = linearHelper.getThreadLocalOffset(GV);
+		stream << offset;
+		return COMPILE_OK;
+	}
 	else if(ident=="fmod")
 	{
 		// Handle this internally, C++ does not have float mod operation