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-rw-r--r--tests/arch/ecp5/latches_abc9.ys16
1 files changed, 16 insertions, 0 deletions
diff --git a/tests/arch/ecp5/latches_abc9.ys b/tests/arch/ecp5/latches_abc9.ys
new file mode 100644
index 000000000..ca3182254
--- /dev/null
+++ b/tests/arch/ecp5/latches_abc9.ys
@@ -0,0 +1,16 @@
+read_verilog <<EOT
+module top(input e, d, output q);
+reg l;
+always @*
+ if (e)
+ l = ~d;
+assign q = ~l;
+endmodule
+EOT
+proc
+design -save gold
+
+# Can't run any sort of equivalence check because latches are blown to LUTs
+synth_ecp5 -abc9
+select -assert-count 2 t:LUT4
+select -assert-none t:LUT4 %% t:* %D