1 // Copyright 2013, 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 "a64/macro-assembler-a64.h" 28 #include "a64/instructions-a64.h" 29 #include "globals-vixl.h" 30 31 using namespace vixl; 32 33 static 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. 40 int 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 // Emitting on the last word of the buffer will trigger an assert. 53 const unsigned buffer_instruction_count = buffer_size / kInstructionSize - 1; 54 55 byte* assm_buffer = new byte[buffer_size]; 56 MacroAssembler* masm = new MacroAssembler(assm_buffer, buffer_size); 57 58 #define __ masm-> 59 60 unsigned rounds = instructions / buffer_instruction_count; 61 for (unsigned i = 0; i < rounds; ++i) { 62 for (unsigned j = 0; j < buffer_instruction_count; ++j) { 63 __ add(x0, x1, Operand(x2)); 64 } 65 masm->Reset(); 66 } 67 68 unsigned remaining = instructions % buffer_instruction_count; 69 for (unsigned i = 0; i < remaining; ++i) { 70 __ add(x0, x1, Operand(x2)); 71 } 72 73 delete masm; 74 delete assm_buffer; 75 76 return 0; 77 } 78
