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      1 // Copyright 2015, 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 
     33 using namespace vixl::aarch64;
     34 
     35 static const int kDefaultIterationsCount = 100000;
     36 
     37 // This program focuses on the emission of branches and veneers.
     38 int main(int argc, char* argv[]) {
     39   int iterations = 0;
     40 
     41   switch (argc) {
     42     case 1:
     43       iterations = kDefaultIterationsCount;
     44       break;
     45     case 2:
     46       iterations = atoi(argv[1]);
     47       break;
     48     default:
     49       printf("Usage: %s [#iterations]\n", argv[0]);
     50       exit(1);
     51   }
     52 
     53   size_t base_buf_size = iterations * 4 * kInstructionSize;
     54   timeval start;
     55   gettimeofday(&start, NULL);
     56   MacroAssembler masm(base_buf_size);
     57 
     58 #define __ masm.
     59 
     60   Label target_1, target_2, target_3, target_4;
     61   for (int i = 0; i < iterations; i++) {
     62     __ B(&target_1);
     63   }
     64   __ Bind(&target_1);
     65   for (int i = 0; i < iterations; i++) {
     66     __ B(eq, &target_2);
     67   }
     68   __ Bind(&target_2);
     69   for (int i = 0; i < iterations; i++) {
     70     __ Cbz(x2, &target_3);
     71   }
     72   __ Bind(&target_3);
     73   for (int i = 0; i < iterations; i++) {
     74     __ Tbz(x3, 2, &target_4);
     75   }
     76   __ Bind(&target_4);
     77 
     78   masm.FinalizeCode();
     79 
     80   timeval end;
     81   gettimeofday(&end, NULL);
     82   double delta = (end.tv_sec - start.tv_sec) +
     83                  static_cast<double>(end.tv_usec - start.tv_usec) / 1000000;
     84   printf("A64: time for %d iterations: %gs\n", iterations, delta);
     85 
     86   return 0;
     87 }
     88