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      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 #ifdef VIXL_DEBUG
     39 static const int kDefaultIterationsCount = 10000;
     40 #else
     41 static const int kDefaultIterationsCount = 100000;
     42 #endif
     43 
     44 // This program focuses on the emission of branches and veneers.
     45 void benchmark(int iterations, InstructionSet isa) {
     46   const int buffer_size = 256 * KBytes;
     47 
     48   timeval start;
     49   gettimeofday(&start, NULL);
     50   MacroAssembler masm(buffer_size);
     51   masm.UseInstructionSet(isa);
     52 
     53 #define __ masm.
     54 
     55   Label target_1, target_2, target_3, target_4;
     56   for (int i = 0; i < iterations; i++) {
     57     __ B(&target_1);
     58   }
     59   __ Bind(&target_1);
     60   for (int i = 0; i < iterations; i++) {
     61     __ B(eq, &target_2);
     62   }
     63   __ Bind(&target_2);
     64   for (int i = 0; i < iterations; i++) {
     65     __ Bl(&target_3);
     66   }
     67   __ Bind(&target_3);
     68   for (int i = 0; i < iterations; i++) {
     69     __ Blx(&target_4);
     70   }
     71   __ Bind(&target_4);
     72 
     73   masm.FinalizeCode();
     74   timeval end;
     75   gettimeofday(&end, NULL);
     76   double delta = (end.tv_sec - start.tv_sec) +
     77                  static_cast<double>(end.tv_usec - start.tv_usec) / 1000000;
     78   printf("%s: time for %d iterations: %gs\n",
     79          isa == T32 ? "T32" : "A32",
     80          iterations,
     81          delta);
     82 }
     83 
     84 
     85 int main(int argc, char* argv[]) {
     86   int iterations = 0;
     87 
     88   switch (argc) {
     89     case 1:
     90       iterations = kDefaultIterationsCount;
     91       break;
     92     case 2:
     93       iterations = atoi(argv[1]);
     94       break;
     95     default:
     96       printf("Usage: %s [#iterations]\n", argv[0]);
     97       exit(1);
     98   }
     99 
    100 #ifdef VIXL_INCLUDE_TARGET_A32
    101   benchmark(iterations, A32);
    102 #endif
    103 #ifdef VIXL_INCLUDE_TARGET_T32
    104   benchmark(iterations, T32);
    105 #endif
    106 
    107   return 0;
    108 }
    109