1// Copyright 2016, 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 __ masm-> 30 31void GenerateAbs(MacroAssembler* masm) { 32 // int32_t abs(int32_t x) 33 // Argument location: 34 // x -> r0 35 36 __ Cmp(r0, 0); 37 // If r0 is negative, negate r0. 38 __ Rsb(mi, r0, r0, 0); 39 __ Bx(lr); 40} 41 42 43#ifndef TEST_EXAMPLES 44int main() { 45 MacroAssembler masm(A32); 46 // Generate the code for the example function. 47 Label abs; 48 masm.Bind(&abs); 49 GenerateAbs(&masm); 50 masm.FinalizeCode(); 51#ifdef VIXL_INCLUDE_SIMULATOR_AARCH32 52 // There is no simulator defined for VIXL AArch32. 53 printf("This example cannot be simulated\n"); 54#else 55 byte* code = masm.GetBuffer()->GetStartAddress<byte*>(); 56 uint32_t code_size = masm.GetSizeOfCodeGenerated(); 57 ExecutableMemory memory(code, code_size); 58 // Run the example function. 59 int32_t (*abs_function)(int32_t) = 60 memory.GetEntryPoint<int32_t (*)(int32_t)>(abs, 61 masm.GetInstructionSetInUse()); 62 int32_t input_value = -42; 63 int32_t output_value = (*abs_function)(input_value); 64 printf("native: abs(%d) = %d\n", input_value, output_value); 65#endif 66 return 0; 67} 68#endif // TEST_EXAMPLES 69