diff --git a/.github/workflows/analyze.yaml b/.github/workflows/analyze.yaml
index 48799df3c..ccb2fc2f8 100644
--- a/.github/workflows/analyze.yaml
+++ b/.github/workflows/analyze.yaml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - name: configure
         run: |
-          cd lib && ./configure --enable-sm80 --disable-openmp && cd ..
+          cd lib && ./configure --disable-openmp && cd ..
       - name: analyze
         run: |
           cd lib && scan-build -o ../_analyze --use-cc clang make -j 64
diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
index f6c8d8014..e4987c81f 100644
--- a/.github/workflows/coverage.yaml
+++ b/.github/workflows/coverage.yaml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - name: configure & build
         run: |
-          cd lib && ./configure --enable-sm80 && cd ..
+          cd lib && ./configure && cd ..
           make -j 64 -C test COVER=1 all.tests
       - name: tests
         run: |
diff --git a/.github/workflows/cuda-int-tests.yaml b/.github/workflows/cuda-int-tests.yaml
index 83c9d34f1..fa3d81c62 100644
--- a/.github/workflows/cuda-int-tests.yaml
+++ b/.github/workflows/cuda-int-tests.yaml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - name: configure & build
         run: |
-          cd lib && ./configure --enable-sm80 && cd ..
+          cd lib && ./configure && cd ..
           make -j 64 -C test/int/nnc
       - name: integration tests
         run: |
diff --git a/.github/workflows/ubsan-unit-tests.yaml b/.github/workflows/ubsan-unit-tests.yaml
index 0f4bccb5f..58d3898af 100644
--- a/.github/workflows/ubsan-unit-tests.yaml
+++ b/.github/workflows/ubsan-unit-tests.yaml
@@ -12,7 +12,7 @@ jobs:
           fetch-depth: 0
       - name: configure & build
         run: |
-          cd lib && ./configure --enable-sm80 && cd ..
+          cd lib && ./configure && cd ..
           make -j 64 -C lib ubsan
           make -j 64 -C bin ubsan
           make -j 64 -C bin/nnc ubsan
diff --git a/lib/nnc/ccv_cnnp_model_gradient_checkpointing.c b/lib/nnc/ccv_cnnp_model_gradient_checkpointing.c
index 89977886b..20351e998 100644
--- a/lib/nnc/ccv_cnnp_model_gradient_checkpointing.c
+++ b/lib/nnc/ccv_cnnp_model_gradient_checkpointing.c
@@ -201,31 +201,6 @@ void ccv_cnnp_model_apply_gradient_checkpoints(ccv_cnnp_compiled_data_t* const c
 		}
 		if (input_execs->rnum <= 0 || output_execs->rnum <= 0)
 			continue;
-		ccv_nnc_graph_visit_t* const reverse_visit = ccv_nnc_graph_visit_new(graph, reversed_nodes, exec_rnum, (ccv_nnc_graph_exec_symbol_t*)ccv_array_get(output_execs, 0), output_execs->rnum, (ccv_nnc_graph_exec_symbol_t*)ccv_array_get(input_execs, 0), input_execs->rnum, 1);
-		ccv_nnc_graph_visit_for(reverse_visit, exec_info, node, idx) {
-			if (idx < exec_rnum && !CCV_NNC_GRAPH_EXEC_IS_DEAD(node->flags))
-				maskbit[idx >> 5] |= (1u << (idx & 0x1f));
-		} ccv_nnc_graph_visit_endfor
-		// Check if any of the items in input_execs is not marked, if it is not, there is no connection from it to output_execs, no need to visit.
-		for (j = 0; j < input_execs->rnum;)
-		{
-			const int idx = ((ccv_nnc_tensor_symbol_t*)ccv_array_get(input_execs, j))->d;
-			if (maskbit[idx >> 5] & (1u << (idx & 0x1f)))
-			{
-				++j;
-				continue;
-			}
-			// Not marked, remove this one.
-			if (j < input_execs->rnum - 1)
-				*(ccv_nnc_tensor_symbol_t*)ccv_array_get(input_execs, j) = *(ccv_nnc_tensor_symbol_t*)ccv_array_get(input_execs, input_execs->rnum - 1);
-			--input_execs->rnum;
-		}
-		// Reset maskbit back.
-		ccv_nnc_graph_visit_for(reverse_visit, exec_info, node, idx) {
-			if (idx < exec_rnum && !CCV_NNC_GRAPH_EXEC_IS_DEAD(node->flags))
-				maskbit[idx >> 5] &= ~(1u << (idx & 0x1f));
-		} ccv_nnc_graph_visit_endfor
-		ccv_nnc_graph_visit_free(reverse_visit);
 		// Fill in blanks (i.e. the backward ops that are not showing in above, but should be included to avoid excluding necessary ones). This is done by flowing gradients from outputs back all the way to inputs.
 		ccv_array_clear(input_gradient_execs);
 		ccv_array_clear(output_gradient_execs);