Don't copy ref if exists already

diff --git a/techlibs/ice40/tests/test_dsp_model.sh b/techlibs/ice40/tests/test_dsp_model.sh
index 1bc0cc68830a95d82f6bcd333916e7c678f7a50f..2d42c23ad3c7b6d938049d03b5aa500a008218f6 100644 (file)
--- a/techlibs/ice40/tests/test_dsp_model.sh
+++ b/techlibs/ice40/tests/test_dsp_model.sh
@@ -1,7 +1,9 @@
 #!/bin/bash
 set -ex
 sed 's/SB_MAC16/SB_MAC16_UUT/; /SB_MAC16_UUT/,/endmodule/ p; d;' < ../cells_sim.v > test_dsp_model_uut.v
-cat /opt/lscc/iCEcube2.2017.01/verilog/sb_ice_syn.v > test_dsp_model_ref.v
+if [ ! -f "test_dsp_model_ref.v" ]; then
+       cat /opt/lscc/iCEcube2.2017.01/verilog/sb_ice_syn.v > test_dsp_model_ref.v
+fi
 for tb in testbench \
                testbench_comb_8x8_A testbench_comb_8x8_B testbench_comb_16x16 \
                testbench_seq_16x16_A testbench_seq_16x16_B