/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/*!
 *  Copyright (c) 2017 by Contributors
 * \file intrin_rule_llvm.cc
 */
#ifdef TVM_LLVM_VERSION

#include "intrin_rule_llvm.h"

namespace tvm {
namespace codegen {
namespace llvm {

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.prefetch")
.set_body(DispatchLLVMIntrin<::llvm::Intrinsic::prefetch, 0>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.exp")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::exp, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.fma")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::fmuladd, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.log")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::log, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.sqrt")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::sqrt, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.floor")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::floor, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.ceil")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::ceil, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.trunc")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::trunc, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.fabs")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::fabs, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.round")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::round, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.tanh")
.set_body([](const TVMArgs& targs, TVMRetValue* rv) {
  Expr e = targs[0];
  const ir::Call* call = e.as<ir::Call>();
  CHECK(call != nullptr);
  const Expr& x = call->args[0];
  Expr one = make_const(x.type(), 1);
  Expr two = make_const(x.type(), 2);
  Expr neg_two = make_const(x.type(), -2);

  Expr exp_neg2x = ir::Call::make(
      x.type(), "exp", {neg_two * x}, ir::Call::PureIntrinsic);
  Expr exp_pos2x = ir::Call::make(
      x.type(), "exp", {two * x}, ir::Call::PureIntrinsic);

  Expr tanh_pos = (one - exp_neg2x) / (one + exp_neg2x);
  Expr tanh_neg = (exp_pos2x - one) / (exp_pos2x + one);
  *rv = ir::Select::make(
      x >= make_zero(x.type()), tanh_pos, tanh_neg);
});

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.pow")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::pow, 1>);

TVM_REGISTER_GLOBAL("tvm.intrin.rule.llvm.popcount")
.set_body(DispatchLLVMPureIntrin<::llvm::Intrinsic::ctpop, 1>);

}  // namespace llvm
}  // namespace codegen
}  // namespace tvm

#endif  // LLVM_VERSION
