CUDA: fuse gate + up for mmvq, and mmvf

ggml/src/ggml-cuda/ggml-cuda.cu

@@ -2007,6 +2007,95 @@ static void ggml_cuda_mul_mat_batched_cublas(ggml_backend_cuda_context & ctx, co
     }
 }
 
+static bool ggml_cuda_should_fuse_mul_mat(const ggml_tensor * ffn_up,
+                                          const ggml_tensor * ffn_gate,
+                                          const ggml_tensor * glu) {
+    bool is_mul_mat = ffn_up->op == GGML_OP_MUL_MAT && ffn_gate->op == GGML_OP_MUL_MAT && glu->op == GGML_OP_GLU;
+    bool is_mul_mat_id =
+        ffn_up->op == GGML_OP_MUL_MAT_ID && ffn_gate->op == GGML_OP_MUL_MAT_ID && glu->op == GGML_OP_GLU;
+
+    GGML_ASSERT(ffn_up && ffn_gate && glu);
+
+    if (!is_mul_mat && !is_mul_mat_id) {
+        return false;
+    }
+
+    if (ffn_up->src[0]->type != ffn_gate->src[0]->type || !ggml_are_same_shape(ffn_up->src[0], ffn_gate->src[0]) ||
+        !ggml_are_same_stride(ffn_up->src[0], ffn_gate->src[0])) {
+        return false;
+    }
+
+    if (ffn_up->src[1] != ffn_gate->src[1]) {
+        return false;
+    }
+
+    if (ffn_up->src[2] && (ffn_up->src[2] != ffn_gate->src[2])) {
+        return false;
+    }
+
+    if (glu->src[0] != ffn_gate && glu->src[1] != ffn_up) {
+        return false;
+    }
+
+    static constexpr std::array<ggml_glu_op, 2> valid_glu_ops = { GGML_GLU_OP_SWIGLU, GGML_GLU_OP_GEGLU };
+
+    if (std::find(valid_glu_ops.begin(), valid_glu_ops.end(), ggml_get_glu_op(glu)) == valid_glu_ops.end()) {
+        return false;
+    }
+
+    if (const bool swapped = ggml_get_op_params_i32(glu, 1); swapped) {
+        return false;
+    }
+
+    const bool split = ggml_backend_buft_is_cuda_split(ffn_up->src[0]->buffer->buft) ||
+                       ggml_backend_buft_is_cuda_split(ffn_gate->src[0]->buffer->buft);
+
+    //TODO: add support for fusion for split buffers
+    if (split) {
+        return false;
+    }
+
+    return true;
+}
+
+static bool ggml_cuda_should_fuse_mul_mat_vec_f(const ggml_tensor * tensor) {
+    ggml_tensor *       src0 = tensor->src[0];
+    ggml_tensor *       src1 = tensor->src[1];
+    const ggml_tensor * dst  = tensor;
+
+    bool use_mul_mat_vec_f =
+        (src0->type == GGML_TYPE_F32 || src0->type == GGML_TYPE_F16 || src0->type == GGML_TYPE_BF16) &&
+        src1->type == GGML_TYPE_F32 && dst->type == GGML_TYPE_F32;
+
+    const int cc      = ggml_cuda_info().devices[ggml_cuda_get_device()].cc;
+    use_mul_mat_vec_f = use_mul_mat_vec_f && ggml_cuda_should_use_mmvf(src0->type, cc, src0->ne, src1->ne[1]);
+
+    if (tensor->op == GGML_OP_MUL_MAT_ID) {
+        use_mul_mat_vec_f = use_mul_mat_vec_f && dst->ne[2] == 1;
+    }
+
+    return use_mul_mat_vec_f;
+}
+
+static bool ggml_cuda_should_fuse_mul_mat_vec_q(const ggml_tensor * tensor) {
+    ggml_tensor *       src0 = tensor->src[0];
+    ggml_tensor *       src1 = tensor->src[1];
+    const ggml_tensor * dst  = tensor;
+
+    const bool bad_padding_clear = ggml_backend_buffer_get_usage(src0->buffer) == GGML_BACKEND_BUFFER_USAGE_COMPUTE &&
+                                   ggml_nbytes(src0) != ggml_backend_buffer_get_alloc_size(src0->buffer, src0) &&
+                                   src0->view_src;
+
+    bool use_mul_mat_vec_q = ggml_is_quantized(src0->type) && !bad_padding_clear && src1->type == GGML_TYPE_F32 &&
+                             dst->type == GGML_TYPE_F32 && src1->ne[1] <= MMVQ_MAX_BATCH_SIZE;
+
+    if (tensor->op == GGML_OP_MUL_MAT_ID) {
+        use_mul_mat_vec_q = use_mul_mat_vec_q && dst->ne[2] == 1;
+    }
+
+    return use_mul_mat_vec_q;
+}
+
 static void ggml_cuda_mul_mat(ggml_backend_cuda_context & ctx, const ggml_tensor * src0, const ggml_tensor * src1, ggml_tensor * dst) {
     const bool split = ggml_backend_buft_is_cuda_split(src0->buffer->buft);
 
@@ -2855,6 +2944,25 @@ static bool ggml_cuda_can_fuse(const struct ggml_cgraph * cgraph, int node_idx,
         }
     }
 
+    std::initializer_list<enum ggml_op> mul_mat_id_glu_ops = { GGML_OP_MUL_MAT_ID, GGML_OP_MUL_MAT_ID, GGML_OP_GLU };
+
+    std::initializer_list<enum ggml_op> mul_mat_glu_ops = { GGML_OP_MUL_MAT, GGML_OP_MUL_MAT, GGML_OP_GLU };
+
+    if (ops.size() == 3 && (std::equal(ops.begin(), ops.end(), mul_mat_id_glu_ops.begin()) ||
+                            std::equal(ops.begin(), ops.end(), mul_mat_glu_ops.begin()))) {
+        if (node_idx + 2 >= cgraph->n_nodes) {
+            return false;
+        }
+
+        const ggml_tensor * ffn_gate = cgraph->nodes[node_idx];
+        const ggml_tensor * ffn_up   = cgraph->nodes[node_idx + 1];
+        const ggml_tensor * glu      = cgraph->nodes[node_idx + 2];
+
+        if (ggml_cuda_should_fuse_mul_mat(ffn_up, ffn_gate, glu)) {
+            return true;
+        }
+    }
+
     if (!ggml_can_fuse(cgraph, node_idx, ops)) {
         return false;
     }
@@ -2992,6 +3100,36 @@ static void evaluate_and_capture_cuda_graph(ggml_backend_cuda_context * cuda_ctx
                         }
                     }
 
+                    bool fused_mul_mat_vec = false;
+
+                    for (ggml_op op : { GGML_OP_MUL_MAT, GGML_OP_MUL_MAT_ID }) {
+                        if (ggml_cuda_can_fuse(cgraph, i, { op, op, GGML_OP_GLU }, {})) {
+                            ggml_tensor * glu  = cgraph->nodes[i + 2];
+                            ggml_tensor * gate = glu->src[0];
+                            ggml_tensor * up   = glu->src[1];
+
+                            const ggml_tensor * src0 = up->src[0];
+                            const ggml_tensor * src1 = up->src[1];
+                            const ggml_tensor * ids  = up->src[2];
+
+                            if (ggml_cuda_should_fuse_mul_mat_vec_f(up)) {
+                                ggml_cuda_mul_mat_vec_f(*cuda_ctx, src0, src1, ids, glu, gate->src[0], glu);
+                                fused_mul_mat_vec = true;
+                                break;
+                            }
+
+                            if (ggml_cuda_should_fuse_mul_mat_vec_q(up)) {
+                                ggml_cuda_mul_mat_vec_q(*cuda_ctx, src0, src1, ids, glu, gate->src[0], glu);
+                                fused_mul_mat_vec = true;
+                                break;
+                            }
+                        }
+                    }
+
+                    if (fused_mul_mat_vec) {
+                        i += 2;
+                        continue;
+                    }
 
                     if (ggml_cuda_can_fuse(cgraph, i, { GGML_OP_RMS_NORM, GGML_OP_MUL, GGML_OP_ADD}, {})) {
                         ggml_cuda_op_rms_norm_fused_add(*cuda_ctx, node, cgraph->nodes[i+1], cgraph->nodes[i+2]);