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#version 450
#include "generic_head.glsl"
#include "types.glsl"
#extension GL_EXT_control_flow_attributes : enable
#define FLT_MAX 3.402823466e+38F
layout(local_size_x_id = 0, local_size_y = 1, local_size_z = 1) in;
layout (binding = 0) readonly buffer A {A_TYPE data_a[];};
layout (binding = 1) writeonly buffer D {D_TYPE data_d[];};
layout (constant_id = 0) const uint BLOCK_SIZE = 32;
shared FLOAT_TYPE tmpmax[BLOCK_SIZE];
shared uint tmp[BLOCK_SIZE];
void main() {
const uint row = gl_WorkGroupID.z * 262144 + gl_WorkGroupID.y * 512 + gl_WorkGroupID.x;
const uint col = gl_LocalInvocationID.x;
if (row >= p.KY) {
return;
}
A_TYPE amax = -FLT_MAX;
uint acol = col;
if (col < p.KX) {
amax = data_a[row*p.KX + col];
}
for (uint i = col + BLOCK_SIZE; i < p.KX; i += BLOCK_SIZE) {
A_TYPE val = data_a[row*p.KX + i];
if (val > amax) {
amax = val;
acol = i;
}
}
tmp[col] = acol;
tmpmax[col] = amax;
barrier();
[[unroll]] for (int s = int(BLOCK_SIZE) / 2; s > 0; s >>= 1) {
if (col < s && col + s < p.KX) {
if (tmpmax[col] < tmpmax[col + s]) {
tmpmax[col] = tmpmax[col + s];
tmp[col] = tmp[col + s];
}
}
barrier();
}
if (col == 0) {
data_d[row] = D_TYPE(tmp[0]);
}
}
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