72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
// Copyright 2016, 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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using namespace vixl;
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using namespace vixl::aarch32;
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#define __ masm->
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void GenerateAbs(MacroAssembler* masm) {
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// int32_t abs(int32_t x)
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// Argument location:
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// x -> r0
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__ Cmp(r0, 0);
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// If r0 is negative, negate r0.
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__ Rsb(mi, r0, r0, 0);
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__ Bx(lr);
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}
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#ifndef TEST_EXAMPLES
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int main() {
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MacroAssembler masm(A32);
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// Generate the code for the example function.
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Label abs;
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masm.Bind(&abs);
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GenerateAbs(&masm);
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masm.FinalizeCode();
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#ifdef VIXL_INCLUDE_SIMULATOR_AARCH32
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// There is no simulator defined for VIXL AArch32.
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printf("This example cannot be simulated\n");
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#else
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byte* code = masm.GetBuffer()->GetStartAddress<byte*>();
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uint32_t code_size = masm.GetSizeOfCodeGenerated();
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ExecutableMemory memory(code, code_size);
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// Run the example function.
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int32_t (*abs_function)(int32_t) =
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memory.GetEntryPoint<int32_t (*)(int32_t)>(abs,
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masm.GetInstructionSetInUse());
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int32_t input_value = -42;
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int32_t output_value = (*abs_function)(input_value);
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printf("native: abs(%d) = %d\n", input_value, output_value);
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#endif
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return 0;
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}
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#endif // TEST_EXAMPLES
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