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 33using namespace vixl; 34using namespace vixl::aarch64; 35 36static 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. 43int 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