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// Copyright 2016, VIXL authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "examples.h"
#define __ masm->
void GenerateAbs(MacroAssembler* masm) {
// int32_t abs(int32_t x)
// Argument location:
// x -> r0
__ Cmp(r0, 0);
// If r0 is negative, negate r0.
__ Rsb(mi, r0, r0, 0);
__ Bx(lr);
}
#ifndef TEST_EXAMPLES
int main() {
MacroAssembler masm;
masm.SetT32(false);
// Generate the code for the example function.
Label abs;
masm.Bind(&abs);
GenerateAbs(&masm);
masm.FinalizeCode();
#ifdef VIXL_INCLUDE_SIMULATOR
// There is no simulator defined for VIXL AArch32.
printf("This example cannot be simulated\n");
#else
byte* code = masm.GetBuffer().GetBuffer();
uint32_t code_size = masm.GetBuffer().GetSizeInBytes();
ExecutableMemory memory(code, code_size);
// Run the example function.
int32_t (*abs_function)(int32_t) =
memory.GetEntryPoint<int32_t (*)(int32_t)>(abs);
int32_t input_value = -42;
int32_t output_value = (*abs_function)(input_value);
printf("native: abs(%d) = %d\n", input_value, output_value);
#endif
return 0;
}
#endif // TEST_EXAMPLES
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