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[ET-VK] Using shared variable to store calculated output pose to free up registers and improve performance. #7475

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Merged
merged 3 commits into from
Jan 3, 2025
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[ET-VK] Using shared variable to store calculated output pose to free up registers and improve performance. #7475

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[ET-VK] Using shared variable to store calculated output pose to free…
trivedivivek Jan 2, 2025
76c2011
Update on "[ET-VK] Using shared variable to store calculated output p…
trivedivivek Jan 3, 2025
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Update on "[ET-VK] Using shared variable to store calculated output p…
trivedivivek Jan 3, 2025
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12 changes: 9 additions & 3 deletions backends/vulkan/runtime/graph/ops/glsl/conv2d_pw.glsl
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Original file line number Diff line number Diff line change
Expand Up @@ -34,13 +34,17 @@ layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;

#extension GL_EXT_shader_explicit_arithmetic_types_int16 : require

// shared memory to hold calculated positions, this would reduce register usage thus improving performance.
shared u16vec2 pos_shared[gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z * TILE_SIZE * TILE_SIZE];

/*
* Computes a 2D pointwise convolution of an NxN output tile. Calculating an
* output tile for pointwise convolution is more efficient because the kernel
* size is only 1x1, making it easier to re-use loaded texels from t_kernel.
*/
void main() {
const uint16_t out_limits_y_scaled = uint16_t((out_limits.y + TILE_SIZE - 1) / TILE_SIZE);
const uint shared_mem_stride = gl_WorkGroupSize.x * gl_WorkGroupSize.y * gl_WorkGroupSize.z;

const u16vec3 gpos = u16vec3(
gl_GlobalInvocationID.x / (out_limits_y_scaled * out_limits.z),
Expand All @@ -58,6 +62,7 @@ void main() {
for (int x = 0; x < TILE_SIZE; ++x) {
pos[i] = u16vec2(
gpos.x * TILE_SIZE + x, gpos.y * TILE_SIZE + y);
pos_shared[(shared_mem_stride * i) + gl_LocalInvocationIndex] = pos[i];
i++;
}
}
Expand All @@ -73,7 +78,7 @@ void main() {
// the top-left element is in a region added by padding.
u16vec2 ipos[TILE_SIZE * TILE_SIZE];
for (int i = 0; i < TILE_SIZE * TILE_SIZE; ++i) {
ipos[i] = pos[i].xy * u16vec2(stride) - u16vec2(padding);
ipos[i] = pos[i] * u16vec2(stride) - u16vec2(padding);
}

vec4 sum[TILE_SIZE * TILE_SIZE];
Expand Down Expand Up @@ -138,8 +143,9 @@ void main() {
}

for (int i = 0; i < TILE_SIZE * TILE_SIZE; ++i) {
if (all(lessThan(u16vec3(pos[i], gpos.z), out_limits))) {
imageStore(t_out, u16vec3(pos[i], gpos.z), op(sum[i], out_min, out_max));
const u16vec2 pos = pos_shared[(shared_mem_stride * i) + gl_LocalInvocationIndex];
if (all(lessThan(u16vec3(pos, gpos.z), out_limits))) {
imageStore(t_out, u16vec3(pos, gpos.z), op(sum[i], out_min, out_max));
}
}
}