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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 "globals-vixl.h"
     28 
     29 #include "aarch64/instructions-aarch64.h"
     30 #include "aarch64/macro-assembler-aarch64.h"
     31 
     32 using namespace vixl;
     33 using namespace vixl::aarch64;
     34 
     35 static const int kDefaultInstructionCount = 100000;
     36 
     37 // Bind many branches to the same label, like bench-branch.cc but with a single
     38 // label. This stresses the label-linking mechanisms.
     39 int main(int argc, char* argv[]) {
     40   int instructions = 0;
     41 
     42   switch (argc) {
     43     case 1:
     44       instructions = kDefaultInstructionCount;
     45       break;
     46     case 2:
     47       instructions = atoi(argv[1]);
     48       break;
     49     default:
     50       printf("Usage: %s [#instructions]\n", argv[0]);
     51       exit(1);
     52   }
     53 
     54   MacroAssembler masm(instructions * kInstructionSize);
     55   ExactAssemblyScope scope(&masm, instructions * kInstructionSize);
     56 
     57 #define __ masm.
     58 
     59   Label target;
     60   for (int i = 0; i < instructions; i++) {
     61     __ b(&target);
     62   }
     63   __ bind(&target);
     64 
     65   masm.FinalizeCode();
     66 
     67   return 0;
     68 }
     69