#version 450
/* SwiGLU activation: gate = silu(gate) * up, in place on `gate`.
 * silu(v) = v * sigmoid(v). */
layout(local_size_x = 256) in;

layout(std430, binding = 0) buffer Gate { float gate[]; };
layout(std430, binding = 1) readonly buffer Up { float up[]; };

layout(push_constant) uniform PC { uint n; } pc;

void main() {
    uint stride_g = gl_NumWorkGroups.x * 256u;
    for (uint i = gl_GlobalInvocationID.x; i < pc.n; i += stride_g) {
        float v = gate[i];
        gate[i] = (v / (1.0 + exp(-v))) * up[i];
    }
}