1 // Copyright 2013, 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 int main(void) { 47 // Create and initialize the assembler and the simulator. 48 byte assm_buf[BUF_SIZE]; 49 MacroAssembler masm(assm_buf, BUF_SIZE); 50 Decoder decoder; 51 Simulator simulator(&decoder); 52 53 // Generate the code for the example function. 54 Label abs; 55 masm.Bind(&abs); 56 GenerateAbs(&masm); 57 masm.FinalizeCode(); 58 59 // Run the example function. 60 int64_t input_value = -42; 61 simulator.set_xreg(0, input_value); 62 simulator.RunFrom(abs.target()); 63 printf("abs(%ld) = %ld\n", input_value, simulator.xreg(0)); 64 65 return 0; 66 } 67 #endif 68
