From b81692b2df991c43e79e20b6b014f776f02d9611 Mon Sep 17 00:00:00 2001
From: Beka Barbakadze <beka.barbakadze@zama.ai>
Date: Fri, 26 Jul 2024 13:22:18 +0400
Subject: [PATCH] chore(gpu): add comments inside
 host_integer_sum_ciphertexts_vec_kb function

---
 backends/tfhe-cuda-backend/cuda/src/integer/multiplication.cuh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backends/tfhe-cuda-backend/cuda/src/integer/multiplication.cuh b/backends/tfhe-cuda-backend/cuda/src/integer/multiplication.cuh
index 96a410408d..cf2457d07d 100644
--- a/backends/tfhe-cuda-backend/cuda/src/integer/multiplication.cuh
+++ b/backends/tfhe-cuda-backend/cuda/src/integer/multiplication.cuh
@@ -328,6 +328,9 @@ __host__ void host_integer_sum_ciphertexts_vec_kb(
     cuda_memcpy_async_to_gpu(d_smart_copy_out, h_smart_copy_out, copy_size,
                              streams[0], gpu_indexes[0]);
 
+    // inside d_smart_copy_in there are only -1 values
+    // it's fine to call smart_copy with same pointer
+    // as source and destination
     smart_copy<<<sm_copy_count, 1024, 0, streams[0]>>>(
         new_blocks, new_blocks, d_smart_copy_out, d_smart_copy_in,
         big_lwe_size);