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 <stdint.h> 28 #include <stdio.h> 29 #include <sys/time.h> 30 31 #include "aarch32/constants-aarch32.h" 32 #include "aarch32/instructions-aarch32.h" 33 #include "aarch32/macro-assembler-aarch32.h" 34 35 using namespace vixl; 36 using namespace vixl::aarch32; 37 38 static const int kDefaultIterationCount = 100000; 39 40 // This program focuses on emitting branch instructions targeting a label bound 41 // very closely. Here the MacroAssembler is used. This exercises label binding 42 // and patching mechanisms, as well as the veneer resolving mechanisms for 43 // branches not requiring veneers. 44 void benchmark(int iterations, InstructionSet isa) { 45 const int buffer_size = 256 * KBytes; 46 47 timeval start; 48 gettimeofday(&start, NULL); 49 MacroAssembler masm(buffer_size); 50 masm.UseInstructionSet(isa); 51 52 #define __ masm. 53 54 for (int i = 0; i < iterations; i++) { 55 Label target; 56 __ B(&target); 57 __ B(eq, &target); 58 __ Bl(&target); 59 __ Blx(&target); 60 __ Bind(&target); 61 } 62 63 masm.FinalizeCode(); 64 timeval end; 65 gettimeofday(&end, NULL); 66 double delta = (end.tv_sec - start.tv_sec) + 67 static_cast<double>(end.tv_usec - start.tv_usec) / 1000000; 68 printf("%s: time for %d iterations: %gs\n", 69 isa == T32 ? "T32" : "A32", 70 iterations, 71 delta); 72 } 73 74 75 int main(int argc, char* argv[]) { 76 int iterations = 0; 77 78 switch (argc) { 79 case 1: 80 iterations = kDefaultIterationCount; 81 break; 82 case 2: 83 iterations = atoi(argv[1]); 84 break; 85 default: 86 printf("Usage: %s [#iterations]\n", argv[0]); 87 exit(1); 88 } 89 90 #ifdef VIXL_INCLUDE_TARGET_A32 91 benchmark(iterations, A32); 92 #endif 93 #ifdef VIXL_INCLUDE_TARGET_T32 94 benchmark(iterations, T32); 95 #endif 96 97 return 0; 98 } 99
