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      1 // Copyright 2014, 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
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     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 "examples.h"
     28 
     29 #define __ masm->
     30 
     31 void GenerateAdd3Double(MacroAssembler* masm) {
     32   // double add3_double(double x, double y, double z)
     33   //  Argument locations:
     34   //    x -> d0
     35   //    y -> d1
     36   //    z -> d2
     37   __ Fadd(d0, d0, d1);  // d0 <- x + y
     38   __ Fadd(d0, d0, d2);  // d0 <- d0 + z
     39 
     40   // The return value is already in d0.
     41   __ Ret();
     42 }
     43 
     44 
     45 #ifndef TEST_EXAMPLES
     46 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
     47 int main(void) {
     48   MacroAssembler masm;
     49   Decoder decoder;
     50   Simulator simulator(&decoder);
     51 
     52   // Generate the code for the example function.
     53   Label add3_double;
     54   masm.Bind(&add3_double);
     55   GenerateAdd3Double(&masm);
     56   masm.FinalizeCode();
     57 
     58   // Run the example function.
     59   double a = 498.36547;
     60   double b = 23.369;
     61   double c = 7964.697954;
     62   simulator.WriteDRegister(0, a);
     63   simulator.WriteDRegister(1, b);
     64   simulator.WriteDRegister(2, c);
     65   simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&add3_double));
     66   printf("%f + %f + %f = %f\n", a, b, c, simulator.ReadDRegister(0));
     67 
     68   return 0;
     69 }
     70 #else
     71 // Without the simulator there is nothing to test.
     72 int main(void) { return 0; }
     73 #endif  // VIXL_INCLUDE_SIMULATOR_AARCH64
     74 #endif  // TEST_EXAMPLES
     75