/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed 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.
*/
#include <android-base/logging.h>
#include "base/casts.h"
#include "jni.h"
namespace art {
// Make the array volatile, which is apparently making the C compiler
// use FP registers in the method below.
volatile double array[] = {
1.
0,
2.
0,
3.
0,
4.
0,
5.
0,
6.
0,
7.
0,
8.
0,
9.
0,
10.
0,
11.
0,
12.
0 };
extern "C" JNIEXPORT
void JNICALL Java_Main_holdFpTemporaries(JNIEnv* env, jclass cls) {
jmethodID mid = env->GetStaticMethodID(cls,
"caller",
"(IIJ)V");
CHECK(mid != nullptr);
// Load values from the arrays, which will be loaded in callee-save FP registers.
double a = array[
0];
double b = array[
1];
double c = array[
2];
double d = array[
3];
double e = array[
4];
double f = array[
5];
double g = array[
6];
double h = array[
7];
double i = array[
8];
double j = array[
9];
double k = array[
10];
double l = array[
11];
env->CallStaticVoidMethod(cls, mid,
1,
1,
1L);
// Load it in a temporary to please C compiler with bit_cast.
double temp = array[
0];
CHECK_EQ(bit_cast<int64_t>(a), bit_cast<int64_t>(temp));
temp = array[
1];
CHECK_EQ(bit_cast<int64_t>(b), bit_cast<int64_t>(temp));
temp = array[
2];
CHECK_EQ(bit_cast<int64_t>(c), bit_cast<int64_t>(temp));
temp = array[
3];
CHECK_EQ(bit_cast<int64_t>(d), bit_cast<int64_t>(temp));
temp = array[
4];
CHECK_EQ(bit_cast<int64_t>(e), bit_cast<int64_t>(temp));
temp = array[
5];
CHECK_EQ(bit_cast<int64_t>(f), bit_cast<int64_t>(temp));
temp = array[
6];
CHECK_EQ(bit_cast<int64_t>(g), bit_cast<int64_t>(temp));
temp = array[
7];
CHECK_EQ(bit_cast<int64_t>(h), bit_cast<int64_t>(temp));
temp = array[
8];
CHECK_EQ(bit_cast<int64_t>(i), bit_cast<int64_t>(temp));
temp = array[
9];
CHECK_EQ(bit_cast<int64_t>(j), bit_cast<int64_t>(temp));
temp = array[
10];
CHECK_EQ(bit_cast<int64_t>(k), bit_cast<int64_t>(temp));
temp = array[
11];
CHECK_EQ(bit_cast<int64_t>(l), bit_cast<int64_t>(temp));
}
}
// namespace art
