On 12/12, [email protected] wrote:
> # HG changeset patch
> # User Praveen Tiwari
> # Date 1418376812 -19800
> # Node ID ca805794c7519ef698776d0f717fd66b0d3bc626
> # Parent b1c2ef980dfe59c486454a8838c2c1bb74bf4d32
> psyCost_pp: C code optimization, suitable for ASM conversion
>
> psy_sum_std_4x4, is combined version of satd_4x4 and sad<4, 4>, eliminating
> unnecessary load operations, extra arguments(zeroBuf and 0).
> It also replaces SAD operation with low cost sum operation as the sencod
> pixel buffer is zero.
Do we actually measure psy energy for 4x4 pixel blocks? CU's are generally 8x8
to 64x64.
The short-short version which operates on residual blocks might be used
for 4x4 TUs, but I'm not certain about that.
> diff -r b1c2ef980dfe -r ca805794c751 source/common/pixel.cpp
> --- a/source/common/pixel.cpp Thu Dec 11 16:52:06 2014 -0600
> +++ b/source/common/pixel.cpp Fri Dec 12 15:03:32 2014 +0530
> @@ -801,6 +801,38 @@
> #pragma warning(disable: 4127) // conditional expression is constant
> #endif
>
> +int psy_sum_std_4x4(const pixel* pix1, intptr_t stride_pix1)
> +{
> + sum2_t tmp[4][2];
> + sum2_t a0, a1, a2, a3, b0, b1;
> + sum2_t sum = 0;
> + int sum0 = 0;
> + uint32_t sum1 = 0;
> +
> + for (int i = 0; i < 4; i++, pix1 += stride_pix1)
> + {
> + a0 = pix1[0];
> + a1 = pix1[1];
> + a2 = pix1[2];
> + a3 = pix1[3];
> + sum1 = sum1 + (a0 + a1 + a2 + a3);
> + b0 = (a0 + a1) + ((a0 - a1) << BITS_PER_SUM);
> + b1 = (a2 + a3) + ((a2 - a3) << BITS_PER_SUM);
> + tmp[i][0] = b0 + b1;
> + tmp[i][1] = b0 - b1;
> + }
> +
> + for (int i = 0; i < 2; i++)
> + {
> + HADAMARD4(a0, a1, a2, a3, tmp[0][i], tmp[1][i], tmp[2][i],
> tmp[3][i]);
> + a0 = abs2(a0) + abs2(a1) + abs2(a2) + abs2(a3);
> + sum += ((sum_t)a0) + (a0 >> BITS_PER_SUM);
> + }
> +
> + sum0 = (int)(sum >> 1);
> + return (int)(sum0 - (sum1 >> 2));
> +}
> +
> template<int size>
> int psyCost_pp(const pixel* source, intptr_t sstride, const pixel* recon,
> intptr_t rstride)
> {
> @@ -828,8 +860,8 @@
> else
> {
> /* 4x4 is too small for sa8d */
> - int sourceEnergy = satd_4x4(source, sstride, zeroBuf, 0) - (sad<4,
> 4>(source, sstride, zeroBuf, 0) >> 2);
> - int reconEnergy = satd_4x4(recon, rstride, zeroBuf, 0) - (sad<4,
> 4>(recon, rstride, zeroBuf, 0) >> 2);
> + int sourceEnergy = psy_sum_std_4x4(source, sstride);
> + int reconEnergy = psy_sum_std_4x4(recon, rstride);
> return abs(sourceEnergy - reconEnergy);
> }
> }
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--
Steve Borho
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