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#version 450
#extension GL_EXT_shader_16bit_storage : require
#if ADD_RMS
#extension GL_KHR_shader_subgroup_arithmetic : enable
#extension GL_KHR_shader_subgroup_basic : enable
#endif
#include "types.glsl"
#include "generic_binary_head.glsl"
const uint num_threads = 256;
layout (binding = 3, std430) buffer PartialBuf {float partial_sums[];};
layout(local_size_x = num_threads, local_size_y = 1, local_size_z = 1) in;
#if ADD_RMS
// XXX TODO this could be sized based on number of subgroups, but that't not considered a constant
shared FLOAT_TYPE sumsh[num_threads];
#endif
void main() {
uint idx = get_idx();
uint orig_idx = idx;
// num_threads * num_iter must equal 512, to match the wg_denoms and get_idx calculation
const uint num_iter = 2;
FLOAT_TYPE sum_sq = 0;
[[unroll]] for (uint i = 0; i < num_iter; ++i) {
if (idx >= p.ne) {
continue;
}
uint i00, i01, i02, i03;
get_indices(idx, i00, i01, i02, i03);
FLOAT_TYPE sum = FLOAT_TYPE(data_a[get_aoffset() + src0_idx(i00, i01, i02, i03)]) + FLOAT_TYPE(data_b[get_boffset() + src1_idx(i00, i01, i02, i03)]);
sum_sq += sum*sum;
data_d[get_doffset() + dst_idx(i00, i01, i02, i03)] = D_TYPE(sum);
idx += num_threads;
}
#if ADD_RMS
if (p.param3 != 0) {
// reduce the sum within each subgroup, then across subgroups
const uint NumSubgroups = num_threads / gl_SubgroupSize;
sum_sq = subgroupAdd(sum_sq);
if (gl_SubgroupInvocationID == 0) {
sumsh[gl_SubgroupID] = sum_sq;
}
barrier();
[[unroll]] for (uint s = NumSubgroups / 2; s > 0; s >>= 1) {
if (gl_SubgroupID < s && gl_SubgroupInvocationID == 0) {
sum_sq += sumsh[gl_SubgroupID + s];
sumsh[gl_SubgroupID] = sum_sq;
}
barrier();
}
if (gl_SubgroupID == 0 && gl_SubgroupInvocationID == 0) {
partial_sums[orig_idx / (num_iter * num_threads)] = sum_sq;
}
}
#endif
}
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