1 // Copyright 2014, VIXL authors 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are met: 6 // 7 // * Redistributions of source code must retain the above copyright notice, 8 // this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above copyright notice, 10 // this list of conditions and the following disclaimer in the documentation 11 // and/or other materials provided with the distribution. 12 // * Neither the name of ARM Limited nor the names of its contributors may be 13 // used to endorse or promote products derived from this software without 14 // specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 27 #include "examples.h" 28 29 #define ARRAY_SIZE(Array) (sizeof(Array) / sizeof((Array)[0])) 30 #define __ masm-> 31 32 void GenerateSumArray(MacroAssembler* masm) { 33 // uint32_t sum_array(uint8_t* array, uint32_t size) 34 // Argument locations: 35 // array (pointer) -> x0 36 // size -> x1 37 38 Label loop, end; 39 40 __ Mov(x2, x0); 41 __ Mov(w0, 0); 42 43 // There's nothing to do if the array is empty. 44 __ Cbz(w1, &end); 45 46 // Go through the array and sum the elements. 47 __ Bind(&loop); 48 49 __ Ldrb(w3, MemOperand(x2, 1, PostIndex)); // w3 = *(x2++) 50 __ Add(w0, w0, w3); 51 52 __ Sub(w1, w1, 1); 53 __ Cbnz(w1, &loop); 54 55 __ Bind(&end); 56 __ Ret(); 57 } 58 59 60 #ifndef TEST_EXAMPLES 61 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64 62 int main(void) { 63 MacroAssembler masm; 64 Decoder decoder; 65 Simulator simulator(&decoder); 66 67 // Generate the code for the example function. 68 Label sum_array; 69 masm.Bind(&sum_array); 70 GenerateSumArray(&masm); 71 masm.FinalizeCode(); 72 73 // Run the example function. 74 uint8_t data[] = {2, 45, 63, 7, 245, 38}; 75 uintptr_t data_addr = reinterpret_cast<uintptr_t>(data); 76 simulator.WriteXRegister(0, data_addr); 77 simulator.WriteXRegister(1, ARRAY_SIZE(data)); 78 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&sum_array)); 79 80 unsigned int i; 81 for (i = 0; i < ARRAY_SIZE(data) - 1; ++i) { 82 printf("%d + ", data[i]); 83 } 84 printf("%d = %d\n", data[i], simulator.ReadWRegister(0)); 85 86 return 0; 87 } 88 #else 89 // Without the simulator there is nothing to test. 90 int main(void) { return 0; } 91 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64 92 #endif // TEST_EXAMPLES 93
