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 <sys/time.h> 28 #include "globals-vixl.h" 29 30 #include "aarch64/instructions-aarch64.h" 31 #include "aarch64/macro-assembler-aarch64.h" 32 33 using namespace vixl; 34 using namespace vixl::aarch64; 35 36 static const unsigned kDefaultInstructionCount = 100000; 37 38 // This program focuses on emitting simple instructions. 39 // 40 // This code will emit a given number of 'add x0, x1, x2' in a fixed size 41 // buffer, looping over the buffer if necessary. This code therefore focuses 42 // on Emit and Operand. 43 int main(int argc, char* argv[]) { 44 unsigned instructions = 0; 45 46 switch (argc) { 47 case 1: 48 instructions = kDefaultInstructionCount; 49 break; 50 case 2: 51 instructions = atoi(argv[1]); 52 break; 53 default: 54 printf("Usage: %s [#instructions]\n", argv[0]); 55 exit(1); 56 } 57 58 const unsigned buffer_size = 256 * KBytes; 59 const unsigned buffer_instruction_count = buffer_size / kInstructionSize; 60 timeval start; 61 gettimeofday(&start, NULL); 62 MacroAssembler masm(buffer_size); 63 64 #define __ masm. 65 66 unsigned rounds = instructions / buffer_instruction_count; 67 for (unsigned i = 0; i < rounds; ++i) { 68 { 69 ExactAssemblyScope scope(&masm, buffer_size); 70 for (unsigned j = 0; j < buffer_instruction_count; ++j) { 71 __ add(x0, x1, Operand(x2)); 72 } 73 } 74 masm.Reset(); 75 } 76 77 unsigned remaining = instructions % buffer_instruction_count; 78 { 79 ExactAssemblyScope scope(&masm, remaining * kInstructionSize); 80 for (unsigned i = 0; i < remaining; ++i) { 81 __ add(x0, x1, Operand(x2)); 82 } 83 } 84 85 masm.FinalizeCode(); 86 timeval end; 87 gettimeofday(&end, NULL); 88 double delta = (end.tv_sec - start.tv_sec) + 89 static_cast<double>(end.tv_usec - start.tv_usec) / 1000000; 90 printf("A64: time for %d instructions: %gs\n", instructions, delta); 91 92 return 0; 93 } 94