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 31 void 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 44 int 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 int32_t input_value = -42; 62 int32_t output_value = (*abs_function)(input_value); 63 printf("native: abs(%d) = %d\n", input_value, output_value); 64 #endif 65 return 0; 66 } 67 #endif // TEST_EXAMPLES 68