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
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25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 #include "examples.h"
28
29 using namespace vixl;
30 using namespace vixl::aarch64;
31
32 #define __ masm->
33
GenerateAdd4Double(MacroAssembler * masm)34 void GenerateAdd4Double(MacroAssembler* masm) {
35 // double Add4Double(uint64_t a, double b, uint64_t c, double d)
36 // Argument locations:
37 // a -> x0
38 // b -> d0
39 // c -> x1
40 // d -> d1
41
42 // Turn 'a' and 'c' into double values.
43 __ Ucvtf(d2, x0);
44 __ Ucvtf(d3, x1);
45
46 // Add everything together.
47 __ Fadd(d0, d0, d1);
48 __ Fadd(d2, d2, d3);
49 __ Fadd(d0, d0, d2);
50
51 // The return value is in d0.
52 __ Ret();
53 }
54
55
56 #ifndef TEST_EXAMPLES
57 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
main(void)58 int main(void) {
59 MacroAssembler masm;
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.WriteXRegister(0, a);
75 simulator.WriteDRegister(0, b);
76 simulator.WriteXRegister(1, c);
77 simulator.WriteDRegister(1, d);
78 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&add4_double));
79 // clang-format off
80 printf("%" PRIu64 " + %f + %" PRIu64 " + %f = %f\n",
81 a, b, c, d, simulator.ReadDRegister(0));
82 // clang-format on
83
84 return 0;
85 }
86 #else
87 // Without the simulator there is nothing to test.
main(void)88 int main(void) { return 0; }
89 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64
90 #endif // TEST_EXAMPLES
91