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      1 // Copyright 2014, ARM Limited
      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
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     20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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     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 BUF_SIZE (4096)
     30 #define __ masm->
     31 
     32 void GenerateAdd4Double(MacroAssembler* masm) {
     33   // double Add4Double(uint64_t a, double b, uint64_t c, double d)
     34   //  Argument locations:
     35   //    a -> x0
     36   //    b -> d0
     37   //    c -> x1
     38   //    d -> d1
     39 
     40   // Turn 'a' and 'c' into double values.
     41   __ Ucvtf(d2, x0);
     42   __ Ucvtf(d3, x1);
     43 
     44   // Add everything together.
     45   __ Fadd(d0, d0, d1);
     46   __ Fadd(d2, d2, d3);
     47   __ Fadd(d0, d0, d2);
     48 
     49   // The return value is in d0.
     50   __ Ret();
     51 }
     52 
     53 
     54 #ifndef TEST_EXAMPLES
     55 #ifdef VIXL_INCLUDE_SIMULATOR
     56 int main(void) {
     57   // Create and initialize the assembler and the simulator.
     58   byte assm_buf[BUF_SIZE];
     59   MacroAssembler masm(assm_buf, BUF_SIZE);
     60   Decoder decoder;
     61   Simulator simulator(&decoder);
     62 
     63   // Generate the code for the example function.
     64   Label add4_double;
     65   masm.Bind(&add4_double);
     66   GenerateAdd4Double(&masm);
     67   masm.FinalizeCode();
     68 
     69   // Run the example function.
     70   uint64_t a = 21;
     71   double b = 987.3654;
     72   uint64_t c = 4387;
     73   double d = 36.698754;
     74   simulator.set_xreg(0, a);
     75   simulator.set_dreg(0, b);
     76   simulator.set_xreg(1, c);
     77   simulator.set_dreg(1, d);
     78   simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&add4_double));
     79   printf("%ld + %f + %ld + %f = %f\n", a, b, c, d, simulator.dreg(0));
     80 
     81   return 0;
     82 }
     83 #else
     84 // Without the simulator there is nothing to test.
     85 int main(void) { return 0; }
     86 #endif  // VIXL_INCLUDE_SIMULATOR
     87 #endif  // TEST_EXAMPLES
     88