1 // Copyright 2014, ARM Limited
2 // All rights reserved.
3 //
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5 // modification, are permitted provided that the following conditions are met:
6 //
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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
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13 // used to endorse or promote products derived from this software without
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15 //
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25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27 #include "examples.h"
28
29 #define ARRAY_SIZE(Array) (sizeof(Array) / sizeof((Array)[0]))
30 #define BUF_SIZE (4096)
31 #define __ masm->
32
GenerateSumArray(MacroAssembler * masm)33 void GenerateSumArray(MacroAssembler* masm) {
34 // uint32_t sum_array(uint8_t* array, uint32_t size)
35 // Argument locations:
36 // array (pointer) -> x0
37 // size -> x1
38
39 Label loop, end;
40
41 __ Mov(x2, x0);
42 __ Mov(w0, 0);
43
44 // There's nothing to do if the array is empty.
45 __ Cbz(w1, &end);
46
47 // Go through the array and sum the elements.
48 __ Bind(&loop);
49
50 __ Ldrb(w3, MemOperand(x2, 1, PostIndex)); // w3 = *(x2++)
51 __ Add(w0, w0, w3);
52
53 __ Sub(w1, w1, 1);
54 __ Cbnz(w1, &loop);
55
56 __ Bind(&end);
57 __ Ret();
58 }
59
60
61 #ifndef TEST_EXAMPLES
62 #ifdef VIXL_INCLUDE_SIMULATOR
main(void)63 int main(void) {
64 // Create and initialize the assembler and the simulator.
65 byte assm_buf[BUF_SIZE];
66 MacroAssembler masm(assm_buf, BUF_SIZE);
67 Decoder decoder;
68 Simulator simulator(&decoder);
69
70 // Generate the code for the example function.
71 Label sum_array;
72 masm.Bind(&sum_array);
73 GenerateSumArray(&masm);
74 masm.FinalizeCode();
75
76 // Run the example function.
77 uint8_t data[] = { 2, 45, 63, 7, 245, 38 };
78 uintptr_t data_addr = reinterpret_cast<uintptr_t>(data);
79 simulator.set_xreg(0, data_addr);
80 simulator.set_xreg(1, ARRAY_SIZE(data));
81 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&sum_array));
82
83 unsigned int i;
84 for (i = 0; i < ARRAY_SIZE(data) - 1; ++i) {
85 printf("%d + ", data[i]);
86 }
87 printf("%d = %d\n", data[i], simulator.wreg(0));
88
89 return 0;
90 }
91 #else
92 // Without the simulator there is nothing to test.
main(void)93 int main(void) { return 0; }
94 #endif // VIXL_INCLUDE_SIMULATOR
95 #endif // TEST_EXAMPLES
96