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26
27#include "examples.h"
28
29#define __ masm->
30
31void GenerateAbs(MacroAssembler* masm) {
32  // int32_t abs(int32_t x)
33  // Argument location:
34  //   x -> r0
35
36  __ Cmp(r0, 0);
37  // If r0 is negative, negate r0.
38  __ Rsb(mi, r0, r0, 0);
39  __ Bx(lr);
40}
41
42
43#ifndef TEST_EXAMPLES
44int main() {
45  MacroAssembler masm(A32);
46  // Generate the code for the example function.
47  Label abs;
48  masm.Bind(&abs);
49  GenerateAbs(&masm);
50  masm.FinalizeCode();
51#ifdef VIXL_INCLUDE_SIMULATOR_AARCH32
52  // There is no simulator defined for VIXL AArch32.
53  printf("This example cannot be simulated\n");
54#else
55  byte* code = masm.GetBuffer()->GetStartAddress<byte*>();
56  uint32_t code_size = masm.GetSizeOfCodeGenerated();
57  ExecutableMemory memory(code, code_size);
58  // Run the example function.
59  int32_t (*abs_function)(int32_t) =
60      memory.GetEntryPoint<int32_t (*)(int32_t)>(abs,
61                                                 masm.GetInstructionSetInUse());
62  int32_t input_value = -42;
63  int32_t output_value = (*abs_function)(input_value);
64  printf("native: abs(%d) = %d\n", input_value, output_value);
65#endif
66  return 0;
67}
68#endif  // TEST_EXAMPLES
69