Remove old BTOR back-end

backends/btor/Makefile.inc

@@ -1,3 +0,0 @@
-
-OBJS += backends/btor/btor.o
-

backends/btor/README

@@ -1,23 +0,0 @@
-
-This is the Yosys BTOR backend.
-It is developed by Ahmed Irfan <irfan@fbk.eu> - Fondazione Bruno Kessler, Trento, Italy
-
-Master git repository for the BTOR backend:
-https://github.com/ahmedirfan1983/yosys
-
-
-[[CITE]] BTOR: Bit-Precise Modelling of Word-Level Problems for Model Checking
-Johannes Kepler University, Linz, Austria
-http://fmv.jku.at/papers/BrummayerBiereLonsing-BPR08.pdf
-
-
-Todos:
-------
-
-- Add checks for unsupported stuff
-    - unsupported cell types
-    - async resets
-    - etc..
-
-- Add support for $lut cells
-

backends/btor/verilog2btor.sh

@@ -1,37 +0,0 @@
-#!/bin/sh
-
-#
-# Script to write BTOR from Verilog design
-#
-
-if [ "$#" -ne 3 ]; then
-  echo "Usage: $0 input.v output.btor top-module-name" >&2
-  exit 1
-fi
-if ! [ -e "$1" ]; then
-  echo "$1 not found" >&2
-  exit 1
-fi
-
-FULL_PATH=$(readlink -f $1)
-DIR=$(dirname $FULL_PATH)
-
-./yosys -q -p "
-read_verilog -sv $1;
-hierarchy -top $3;
-hierarchy -libdir $DIR;
-hierarchy -check;
-proc;
-opt; opt_expr -mux_undef; opt;
-rename -hide;;;
-#techmap -map +/pmux2mux.v;;
-splice; opt;
-memory_dff -wr_only;
-memory_collect;;
-flatten;;
-memory_unpack;
-splitnets -driver;
-setundef -zero -undriven;
-opt;;;
-write_btor $2;"
-