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// An equivalent of "addRepeat.hlsl" followed by "addInPlace.hlsl".
// Merging into a single shader saves some global memory bandwidth and reduces CPU overhead wasted binding resources and dispatching shaders
RWBuffer<float> tensor: register( u0 );
Buffer<float> pattern: register( t0 );
Buffer<float> finalAdd: register( t1 );
cbuffer Constants: register( b0 )
{
uint4 tensorSize: packoffset( c0 );
uint4 tensorStrides: packoffset( c1 );
uint4 patternSize: packoffset( c2 );
uint4 patternStrides: packoffset( c3 );
// uint4 finalSize: packoffset( c4 );
uint4 finalStrides: packoffset( c5 );
}
#ifndef THREADS
#define THREADS 256
#endif
#include "repeatUtils.hlsli"
// The micro-kernel of the shader, computes tensor[ rsi.x ] += pattern + finalAdd[ rsi.y ]
inline void add2( uint2 rsi, float pattern )
{
float f = tensor[ rsi.x ];
f += pattern;
f += finalAdd[ rsi.y ];
tensor[ rsi.x ] = f;
}
[ numthreads( THREADS, 1, 1 ) ]
void main( uint3 group: SV_GroupID, uint thread : SV_GroupIndex )
{
const uint2 stridesX = uint2( tensorStrides.x, finalStrides.x );
uint2 rsi;
rsi.x = rowOffset( group, tensorStrides );
rsi.y = rowOffset( group, finalStrides );
const uint rsiEnd = rsi.x + tensorSize.x * stridesX.x;
rsi += stridesX * thread;
uint pat = rowOffset( group % patternSize.yzw, patternStrides );
if( patternSize.x == 1 )
{
// The pattern only has 1 column, broadcasting over the row
const uint2 rsiInc = stridesX * THREADS;
const float p = pattern[ pat ];
for( ; rsi.x < rsiEnd; rsi += rsiInc )
add2( rsi, p );
}
else if( patternSize.x <= THREADS )
{
// pattern size doesn't exceed thread group size, load outside of the loop
const uint threadsPerGroup = THREADS - ( THREADS % patternSize.x );
if( thread >= threadsPerGroup )
return;
const uint2 rsiInc = stridesX * threadsPerGroup;
pat += ( thread % patternSize.x ) * patternStrides.x;
const float p = pattern[ pat ];
for( ; rsi.x < rsiEnd; rsi += rsiInc )
add2( rsi, p );
}
else
{
// Pattern rows are longer than the thread group, need to stream from both buffers
uint3 rsi3;
rsi3.xy = rsi;
rsi3.z = pat + thread * patternStrides.x;
const uint3 rsiInc = uint3( stridesX, patternStrides.x ) * THREADS;
for( ; rsi3.x < rsiEnd; rsi3 += rsiInc )
add2( rsi3.xy, pattern[ rsi3.z ] );
}
}
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