| // Copyright 2014, ARM Limited |
| // 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 ARRAY_SIZE(Array) (sizeof(Array) / sizeof((Array)[0])) |
| #define BUF_SIZE (4096) |
| #define __ masm-> |
| |
| void GenerateSumArray(MacroAssembler* masm) { |
| // uint32_t sum_array(uint8_t* array, uint32_t size) |
| // Argument locations: |
| // array (pointer) -> x0 |
| // size -> x1 |
| |
| Label loop, end; |
| |
| __ Mov(x2, x0); |
| __ Mov(w0, 0); |
| |
| // There's nothing to do if the array is empty. |
| __ Cbz(w1, &end); |
| |
| // Go through the array and sum the elements. |
| __ Bind(&loop); |
| |
| __ Ldrb(w3, MemOperand(x2, 1, PostIndex)); // w3 = *(x2++) |
| __ Add(w0, w0, w3); |
| |
| __ Sub(w1, w1, 1); |
| __ Cbnz(w1, &loop); |
| |
| __ Bind(&end); |
| __ Ret(); |
| } |
| |
| |
| #ifndef TEST_EXAMPLES |
| #ifdef VIXL_INCLUDE_SIMULATOR |
| int main(void) { |
| // Create and initialize the assembler and the simulator. |
| byte assm_buf[BUF_SIZE]; |
| MacroAssembler masm(assm_buf, BUF_SIZE); |
| Decoder decoder; |
| Simulator simulator(&decoder); |
| |
| // Generate the code for the example function. |
| Label sum_array; |
| masm.Bind(&sum_array); |
| GenerateSumArray(&masm); |
| masm.FinalizeCode(); |
| |
| // Run the example function. |
| uint8_t data[] = { 2, 45, 63, 7, 245, 38 }; |
| uintptr_t data_addr = reinterpret_cast<uintptr_t>(data); |
| simulator.set_xreg(0, data_addr); |
| simulator.set_xreg(1, ARRAY_SIZE(data)); |
| simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&sum_array)); |
| |
| unsigned int i; |
| for (i = 0; i < ARRAY_SIZE(data) - 1; ++i) { |
| printf("%d + ", data[i]); |
| } |
| printf("%d = %d\n", data[i], simulator.wreg(0)); |
| |
| return 0; |
| } |
| #else |
| // Without the simulator there is nothing to test. |
| int main(void) { return 0; } |
| #endif // VIXL_INCLUDE_SIMULATOR |
| #endif // TEST_EXAMPLES |