Merge pull request #724 from whitequark/equiv_opt

equiv_opt: new command, for verifying optimization passes

techlibs/ice40/cells_sim.v

@@ -947,6 +947,7 @@ module SB_SPRAM256KA (
 	output reg [15:0] DATAOUT
 );
 `ifndef BLACKBOX
+`ifndef EQUIV
 	reg [15:0] mem [0:16383];
 	wire off = SLEEP || !POWEROFF;
 	integer i;
@@ -973,6 +974,7 @@ module SB_SPRAM256KA (
 		end
 	end
 `endif
+`endif
 endmodule
 
 (* blackbox *)