// Copyright 2014, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "examples.h"
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#define ARRAY_SIZE(Array) (sizeof(Array) / sizeof((Array)[0]))
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#define __ masm->
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void GenerateSumArray(MacroAssembler* masm) {
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// uint32_t sum_array(uint8_t* array, uint32_t size)
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// Argument locations:
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// array (pointer) -> x0
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// size -> x1
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Label loop, end;
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__ Mov(x2, x0);
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__ Mov(w0, 0);
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// There's nothing to do if the array is empty.
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__ Cbz(w1, &end);
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// Go through the array and sum the elements.
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__ Bind(&loop);
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__ Ldrb(w3, MemOperand(x2, 1, PostIndex)); // w3 = *(x2++)
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__ Add(w0, w0, w3);
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__ Sub(w1, w1, 1);
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__ Cbnz(w1, &loop);
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__ Bind(&end);
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__ Ret();
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}
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#ifndef TEST_EXAMPLES
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#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
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int main(void) {
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MacroAssembler masm;
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Decoder decoder;
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Simulator simulator(&decoder);
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// Generate the code for the example function.
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Label sum_array;
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masm.Bind(&sum_array);
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GenerateSumArray(&masm);
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masm.FinalizeCode();
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// Run the example function.
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uint8_t data[] = {2, 45, 63, 7, 245, 38};
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uintptr_t data_addr = reinterpret_cast<uintptr_t>(data);
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simulator.WriteXRegister(0, data_addr);
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simulator.WriteXRegister(1, ARRAY_SIZE(data));
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simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&sum_array));
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(data) - 1; ++i) {
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printf("%d + ", data[i]);
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}
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printf("%d = %d\n", data[i], simulator.ReadWRegister(0));
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return 0;
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}
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#else
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// Without the simulator there is nothing to test.
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int main(void) { return 0; }
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#endif // VIXL_INCLUDE_SIMULATOR_AARCH64
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#endif // TEST_EXAMPLES
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