mirror of
https://github.com/matrix-construct/construct
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73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2021 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_SIMT_MEAN_H
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/// Averaging state; this is for computing running averages
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/// XXX eventually
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struct ircd_math_mean
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{
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/// Summand spread. TODO XXX
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float sum[4];
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/// Divisor.
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uint div;
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/// Last addend.
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float last;
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/// Computed mean.
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float mean;
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};
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#ifdef __OPENCL_VERSION__
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/// Clear the `ircd_math_mean` state to zero.
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inline void
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ircd_simt_math_mean_clear(__local struct ircd_math_mean *const mean)
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{
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mean->sum[0] = 0.0f;
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mean->sum[1] = 0.0f;
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mean->sum[2] = 0.0f;
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mean->sum[3] = 0.0f;
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mean->div = 0;
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mean->last = 0.0f;
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mean->mean = 0.0f;
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}
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#endif
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#ifdef __OPENCL_VERSION__
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/// Compute average of all elements in the input. The result is broadcast
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/// to all elements of the output.
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///
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/// provide:
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/// li = local thread id
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/// ln = local group size
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///
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inline void
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ircd_simt_math_mean_f4lldr(__local float4 *const buf,
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const uint ln,
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const uint li)
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{
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ircd_simt_reduce_add_f4lldr(buf, ln, li);
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if(li == 0)
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{
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const float
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sum = ircd_simt_hadd_f4(buf[li]),
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div = ln * 4,
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res = sum / div;
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buf[li] = res;
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}
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ircd_simt_broadcast_f4lldr(buf, ln, li);
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}
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#endif
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