/*! * \copy *     Copyright (c)  2013, Cisco Systems *     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. * *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 HOLDER 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. * */ #ifdef HAVE_NEON#include "arm_arch_common_macro.S" .macro SQR_ADD_16BYTES arg0, arg1, arg2    vmull.u8 q3, \arg0, \arg0    vmull.u8 q8, \arg1, \arg1    vpadal.u16 \arg2, q3    vpadal.u16 \arg2, q8.endm  WELS_ASM_FUNC_BEGIN SampleVariance16x16_neon    stmdb sp!, {r4}     vld1.8   {q15}, [r0], r1 //save the ref data (16bytes)    vld1.8   {q14}, [r2], r3 //save the src data (16bytes)      vabd.u8  q13, q14, q15    vmull.u8 q12, d27, d27    vmull.u8 q11, d26, d26    vaddl.u16 q12, d24, d25    vpadal.u16 q12, q11     //sqr     vaddl.u8 q13, d26, d27 //sum     vaddl.u8 q10, d28, d29 //sum_cur     vmull.u8 q9,  d29, d29    vmull.u8 q8,  d28, d28    vaddl.u16 q9, d18, d19       //sqr_cur    vpadal.u16 q9, q8     mov r4, #15pixel_var_16x16_loop0:     vld1.8 {q0}, [r0], r1 //save the ref data (16bytes)    vld1.8 {q1}, [r2], r3 //save the src data (16bytes)     vabd.u8 q2, q0, q1     //q10 save sum_cur    vpadal.u8 q10, q1     //q12 save sqr    SQR_ADD_16BYTES d4, d5, q12     //q13 save sum    vpadal.u8 q13, q2     subs r4, #1     //q9 save sqr_cur    SQR_ADD_16BYTES d2, d3, q9     bne pixel_var_16x16_loop0     vadd.u16 d0, d26, d27 //sum    vadd.u16 d1, d20, d21 //sum_cur    vpaddl.u16 q0, q0    vadd.u32 d2, d24, d25 //sqr    vadd.u32 d3, d18, d19 //sqr_cur    vpadd.u32 d0, d0, d1    vpadd.u32 d1, d2, d3     ldr       r4, [sp, #4]     vshr.u32  q0, q0, #8    vmul.u32  d0, d0    vsub.u32  d0, d1, d0    vmovl.u32 q0, d0    vst2.16  {d0[0], d1[0]}, [r4]     ldmia sp!, {r4} WELS_ASM_FUNC_END #endif