1// Copyright 2014, 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 "vixl/a64/macro-assembler-a64.h" 28#include "vixl/a64/instructions-a64.h" 29#include "vixl/globals.h" 30 31using namespace vixl; 32 33static const unsigned kDefaultInstructionCount = 100000; 34 35// This program focuses on emitting simple instructions. 36// 37// This code will emit a given number of 'add x0, x1, x2' in a fixed size 38// buffer, looping over the buffer if necessary. This code therefore focuses 39// on Emit and Operand. 40int main(int argc, char* argv[]) { 41 unsigned instructions = 0; 42 43 switch (argc) { 44 case 1: instructions = kDefaultInstructionCount; break; 45 case 2: instructions = atoi(argv[1]); break; 46 default: 47 printf("Usage: %s [#instructions]\n", argv[0]); 48 exit(1); 49 } 50 51 const unsigned buffer_size = 256 * KBytes; 52 const unsigned buffer_instruction_count = buffer_size / kInstructionSize; 53 MacroAssembler masm(buffer_size); 54 55 #define __ masm. 56 57 unsigned rounds = instructions / buffer_instruction_count; 58 for (unsigned i = 0; i < rounds; ++i) { 59 { 60 InstructionAccurateScope scope(&masm, buffer_instruction_count); 61 for (unsigned j = 0; j < buffer_instruction_count; ++j) { 62 __ add(x0, x1, Operand(x2)); 63 } 64 } 65 masm.Reset(); 66 } 67 68 unsigned remaining = instructions % buffer_instruction_count; 69 { 70 InstructionAccurateScope scope(&masm, remaining); 71 for (unsigned i = 0; i < remaining; ++i) { 72 __ add(x0, x1, Operand(x2)); 73 } 74 } 75 76 masm.FinalizeCode(); 77 78 return 0; 79} 80