shithub: openh264

ref: 2eb88007121a85b23bdfe85b16a36b06a3f793ba
dir: /codec/processing/src/arm64/adaptive_quantization_aarch64_neon.S/

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/*!
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 *     Copyright (c)  2013, Cisco Systems
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 *          distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 *     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *     FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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#ifdef HAVE_NEON_AARCH64
#include "arm_arch64_common_macro.S"
WELS_ASM_AARCH64_FUNC_BEGIN SampleVariance16x16_AArch64_neon
    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