ref: a56b927135a61c4363a21d6e779f611de6304932
dir: /codec/processing/src/arm64/adaptive_quantization_aarch64_neon.S/
/*!
* \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,
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* 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
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#ifdef HAVE_NEON_AARCH64
#include "arm_arch64_common_macro.S"
WELS_ASM_AARCH64_FUNC_BEGIN SampleVariance16x16_AArch64_neon
SIGN_EXTENSION x1, w1
SIGN_EXTENSION x3, w3
ld1 {v1.16b}, [x0], x1 //save the ref data (16bytes)
ld1 {v0.16b}, [x2], x3 //save the src data (16bytes)
uabd v2.16b, v0.16b, v1.16b
umull v3.8h, v2.8b, v2.8b
umull2 v4.8h, v2.16b, v2.16b
uaddlp v4.4s, v4.8h
uadalp v4.4s, v3.8h //sqr
uaddlp v2.8h, v2.16b //sum
uaddlp v1.8h, v0.16b //sum_cur
umull v3.8h, v0.8b, v0.8b
umull2 v5.8h, v0.16b, v0.16b
uaddlp v3.4s, v3.8h
uadalp v3.4s, v5.8h //sqr_cur
.rept 15
ld1 {v5.16b}, [x0], x1 //save the ref data (16bytes)
ld1 {v0.16b}, [x2], x3 //save the src data (16bytes)
uabd v6.16b, v0.16b, v5.16b
//v1 save sum_cur
uadalp v1.8h, v0.16b
//v4 save sqr
umull v5.8h, v6.8b, v6.8b
umull2 v7.8h, v6.16b, v6.16b
uadalp v4.4s, v5.8h //sqr
uadalp v4.4s, v7.8h //sqr
//v2 save sum
uadalp v2.8h, v6.16b
//v3 save sqr_cur
umull v5.8h, v0.8b, v0.8b
umull2 v7.8h, v0.16b, v0.16b
uadalp v3.4s, v5.8h //sqr_cur
uadalp v3.4s, v7.8h //sqr_cur
.endr
uaddlv s2, v2.8h //sum
uaddlv s1, v1.8h //sum_cur
ins v2.s[1], v1.s[0] // sum, sum_cur
shrn v2.4h, v2.4s, #8 // sum, sum_cur>>8
mul v2.4h, v2.4h, v2.4h//// sum*sum, sum_cur*sum_cur
uaddlv d4, v4.4s //sqr
uaddlv d3, v3.4s //sqr_cur
ins v4.s[1], v3.s[0] // sqr, sqr_cur
shrn v4.4h, v4.4s, #8 // sqr, sqr_cur>>8
sub v4.4h, v4.4h, v2.4h
st1 {v4.s}[0], [x4]
WELS_ASM_AARCH64_FUNC_END
#endif