xref: /aosp_15_r20/external/vixl/examples/aarch64/swap4.cc (revision f5c631da2f1efdd72b5fd1e20510e4042af13d77)

// Copyright 2014, VIXL authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
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//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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#include "examples.h"

using namespace vixl;
using namespace vixl::aarch64;

#define __ masm->

void GenerateSwap4(MacroAssembler* masm) {
  // VIXL's macro assembler provides some functions to manipulate the stack.
  // This example shows some of these functions.
  __ Claim(16);
  __ Poke(x0, 0);
  __ Poke(x1, 8);
  __ Push(x3, x2);

  __ Pop(x1, x0);
  __ Peek(x3, 0);
  __ Peek(x2, 8);
  __ Drop(16);

  __ Ret();
}


#ifndef TEST_EXAMPLES
#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
int main(void) {
  MacroAssembler masm;
  Decoder decoder;
  Simulator simulator(&decoder);

  // Generate the code for the example function.
  Label swap4;
  masm.Bind(&swap4);
  GenerateSwap4(&masm);
  masm.FinalizeCode();

  // Run the example function.
  simulator.WriteXRegister(0, 0x1111111111111111);
  simulator.WriteXRegister(1, 0x2222222222222222);
  simulator.WriteXRegister(2, 0x3333333333333333);
  simulator.WriteXRegister(3, 0x4444444444444444);

  // clang-format off
  printf("Before swap4:\n"
         "x0 = 0x%" PRIx64 "\n"
         "x1 = 0x%" PRIx64 "\n"
         "x2 = 0x%" PRIx64 "\n"
         "x3 = 0x%" PRIx64 "\n",
         simulator.ReadXRegister(0), simulator.ReadXRegister(1),
         simulator.ReadXRegister(2), simulator.ReadXRegister(3));
  // clang-format on

  simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap4));

  // clang-format off
  printf("After swap4:\n"
         "x0 = 0x%" PRIx64 "\n"
         "x1 = 0x%" PRIx64 "\n"
         "x2 = 0x%" PRIx64 "\n"
         "x3 = 0x%" PRIx64 "\n",
         simulator.ReadXRegister(0), simulator.ReadXRegister(1),
         simulator.ReadXRegister(2), simulator.ReadXRegister(3));
  // clang-format on

  return 0;
}
#else
// Without the simulator there is nothing to test.
int main(void) { return 0; }
#endif  // VIXL_INCLUDE_SIMULATOR_AARCH64
#endif  // TEST_EXAMPLES