1 // Copyright 2014, ARM Limited 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 BUF_SIZE (4096) 30 #define __ masm-> 31 32 void GenerateAbs(MacroAssembler* masm) { 33 // int64_t abs(int64_t x) 34 // Argument location: 35 // x -> x0 36 37 // This example uses a conditional instruction (cneg) to compute the 38 // absolute value of an integer. 39 __ Cmp(x0, 0); 40 __ Cneg(x0, x0, mi); 41 __ Ret(); 42 } 43 44 45 #ifndef TEST_EXAMPLES 46 #ifdef VIXL_INCLUDE_SIMULATOR 47 int main(void) { 48 // Create and initialize the assembler and the simulator. 49 byte assm_buf[BUF_SIZE]; 50 MacroAssembler masm(assm_buf, BUF_SIZE); 51 Decoder decoder; 52 Simulator simulator(&decoder); 53 54 // Generate the code for the example function. 55 Label abs; 56 masm.Bind(&abs); 57 GenerateAbs(&masm); 58 masm.FinalizeCode(); 59 60 // Run the example function. 61 int64_t input_value = -42; 62 simulator.set_xreg(0, input_value); 63 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&abs)); 64 printf("abs(%ld) = %ld\n", input_value, simulator.xreg(0)); 65 66 return 0; 67 } 68 #else 69 // Without the simulator there is nothing to test. 70 int main(void) { return 0; } 71 #endif // VIXL_INCLUDE_SIMULATOR 72 #endif // TEST_EXAMPLES 73
