1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <android-base/logging.h> 18 19 #include "base/casts.h" 20 #include "jni.h" 21 22 namespace art { 23 24 // Make the array volatile, which is apparently making the C compiler 25 // use FP registers in the method below. 26 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 }; 27 28 extern "C" JNIEXPORT void JNICALL Java_Main_holdFpTemporaries(JNIEnv* env, jclass cls) { 29 jmethodID mid = env->GetStaticMethodID(cls, "caller", "(IIJ)V"); 30 CHECK(mid != nullptr); 31 // Load values from the arrays, which will be loaded in callee-save FP registers. 32 double a = array[0]; 33 double b = array[1]; 34 double c = array[2]; 35 double d = array[3]; 36 double e = array[4]; 37 double f = array[5]; 38 double g = array[6]; 39 double h = array[7]; 40 double i = array[8]; 41 double j = array[9]; 42 double k = array[10]; 43 double l = array[11]; 44 env->CallStaticVoidMethod(cls, mid, 1, 1, 1L); 45 // Load it in a temporary to please C compiler with bit_cast. 46 double temp = array[0]; 47 CHECK_EQ(bit_cast<int64_t>(a), bit_cast<int64_t>(temp)); 48 temp = array[1]; 49 CHECK_EQ(bit_cast<int64_t>(b), bit_cast<int64_t>(temp)); 50 temp = array[2]; 51 CHECK_EQ(bit_cast<int64_t>(c), bit_cast<int64_t>(temp)); 52 temp = array[3]; 53 CHECK_EQ(bit_cast<int64_t>(d), bit_cast<int64_t>(temp)); 54 temp = array[4]; 55 CHECK_EQ(bit_cast<int64_t>(e), bit_cast<int64_t>(temp)); 56 temp = array[5]; 57 CHECK_EQ(bit_cast<int64_t>(f), bit_cast<int64_t>(temp)); 58 temp = array[6]; 59 CHECK_EQ(bit_cast<int64_t>(g), bit_cast<int64_t>(temp)); 60 temp = array[7]; 61 CHECK_EQ(bit_cast<int64_t>(h), bit_cast<int64_t>(temp)); 62 temp = array[8]; 63 CHECK_EQ(bit_cast<int64_t>(i), bit_cast<int64_t>(temp)); 64 temp = array[9]; 65 CHECK_EQ(bit_cast<int64_t>(j), bit_cast<int64_t>(temp)); 66 temp = array[10]; 67 CHECK_EQ(bit_cast<int64_t>(k), bit_cast<int64_t>(temp)); 68 temp = array[11]; 69 CHECK_EQ(bit_cast<int64_t>(l), bit_cast<int64_t>(temp)); 70 } 71 72 } // namespace art 73
