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 "base/casts.h" 18 #include "base/logging.h" 19 #include "jni.h" 20 21 namespace art { 22 23 // Make the array volatile, which is apparently making the C compiler 24 // use FP registers in the method below. 25 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 }; 26 27 extern "C" JNIEXPORT void JNICALL Java_Main_holdFpTemporaries(JNIEnv* env, jclass cls) { 28 jmethodID mid = env->GetStaticMethodID(cls, "caller", "(IIJ)V"); 29 CHECK(mid != nullptr); 30 // Load values from the arrays, which will be loaded in callee-save FP registers. 31 double a = array[0]; 32 double b = array[1]; 33 double c = array[2]; 34 double d = array[3]; 35 double e = array[4]; 36 double f = array[5]; 37 double g = array[6]; 38 double h = array[7]; 39 double i = array[8]; 40 double j = array[9]; 41 double k = array[10]; 42 double l = array[11]; 43 env->CallStaticVoidMethod(cls, mid, 1, 1, 1L); 44 // Load it in a temporary to please C compiler with bit_cast. 45 double temp = array[0]; 46 CHECK_EQ(bit_cast<int64_t>(a), bit_cast<int64_t>(temp)); 47 temp = array[1]; 48 CHECK_EQ(bit_cast<int64_t>(b), bit_cast<int64_t>(temp)); 49 temp = array[2]; 50 CHECK_EQ(bit_cast<int64_t>(c), bit_cast<int64_t>(temp)); 51 temp = array[3]; 52 CHECK_EQ(bit_cast<int64_t>(d), bit_cast<int64_t>(temp)); 53 temp = array[4]; 54 CHECK_EQ(bit_cast<int64_t>(e), bit_cast<int64_t>(temp)); 55 temp = array[5]; 56 CHECK_EQ(bit_cast<int64_t>(f), bit_cast<int64_t>(temp)); 57 temp = array[6]; 58 CHECK_EQ(bit_cast<int64_t>(g), bit_cast<int64_t>(temp)); 59 temp = array[7]; 60 CHECK_EQ(bit_cast<int64_t>(h), bit_cast<int64_t>(temp)); 61 temp = array[8]; 62 CHECK_EQ(bit_cast<int64_t>(i), bit_cast<int64_t>(temp)); 63 temp = array[9]; 64 CHECK_EQ(bit_cast<int64_t>(j), bit_cast<int64_t>(temp)); 65 temp = array[10]; 66 CHECK_EQ(bit_cast<int64_t>(k), bit_cast<int64_t>(temp)); 67 temp = array[11]; 68 CHECK_EQ(bit_cast<int64_t>(l), bit_cast<int64_t>(temp)); 69 } 70 71 } // namespace art 72
