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// TODO: implement multi-simd softmax (llama.cpp commit e16b9fa4)
#version 450
#include "common.comp"
layout(local_size_x_id = 0) in;
layout(binding = 0) buffer restrict readonly tensorInA { float inA[]; };
layout(binding = 1) buffer restrict readonly tensorInB { float inB[]; };
layout(binding = 2) buffer restrict writeonly tensorOut { float out_[]; };
layout(push_constant) uniform PushConstants {
uint inAOff;
uint inBOff;
uint outOff;
int ne00;
int ne01;
int ne02;
float scale;
int mask;
} pcs;
void main() {
if (gl_SubgroupInvocationID > 31)
return;
const uint i03 = gl_WorkGroupID.z;
const uint i02 = gl_WorkGroupID.y;
const uint i01 = gl_WorkGroupID.x;
const uint extra_off = i03*pcs.ne02*pcs.ne01*pcs.ne00 + i02*pcs.ne01*pcs.ne00 + i01*pcs.ne00;
const uint psrc0 = extra_off + pcs.inAOff; // Based from inA
const uint pmask = i01*pcs.ne00 + pcs.inBOff; // Based from inB
const uint pdst = extra_off + pcs.outOff; // Based from out_
// parallel max
float localMax = uintBitsToFloat(0xFF800000);
for (uint i00 = gl_SubgroupInvocationID.x; i00 < pcs.ne00; i00 += 32) {
localMax = max(localMax, inA[psrc0 + i00]*pcs.scale + (pcs.mask!=0 ? inB[pmask + i00] : 0.0f));
}
float max_ = subgroupMax(localMax);
// parallel sum
float localSum = 0.0f;
for (uint i00 = gl_SubgroupInvocationID.x; i00 < pcs.ne00; i00 += 32) {
const float exp_psrc0 = exp(inA[psrc0 + i00]*pcs.scale + (pcs.mask!=0 ? inB[pmask + i00] : 0.0f) - max_);
localSum += exp_psrc0;
out_[pdst + i00] = exp_psrc0;
}
const float sum = subgroupAdd(localSum);
for (uint i00 = gl_SubgroupInvocationID.x; i00 < pcs.ne00; i00 += 32) {
out_[pdst + i00] /= sum;
}
}
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