Improve the ReadMe.md

Improve the ReadMe.md, in English.

I'm unable to install modelsim

Could you please provide a link for the instructions to install modelsim which worked for you?

Cannot break a chain to preserve WAR dependencies in pipelined block.

After chaining is enabled, the result of an operation in a multi-cycles chain may be read at the middle of a cycles. This means we cannot break the chains at a arbitrary position, hence sometime we cannot break a chain to preserve WAR dependencies in pipelined block. A fail case is shown in [1].

[1]http://192.168.1.253:8010/builders/CustomFast/builds/24

Move the VerilogAST onto the LLVM APInt

Currently the constant values in VerilogAST are limited to no greater than 64bit. This lead to a fail case in 64bit platform: http://192.168.1.253:8010/builders/CustomFast/builds/6.

To solve this problem, we had to represent the constant values the LLVM APInt.

注册并加入SysuEDA

李静波和罗新潮注册github，并加入SysuEDA

自动提取Altera FPGA平台信息

提交自动报告Altera 的特定FPGA中的FU的面积和延时信息的代码。

Installation procedure described in README does not work

The installation procedure described in README.md does not work. Below is the process I used to install the tool (Ubuntu 18.04).

Installation

Prerequisites

Build Tools

Install build-essential, git, automake, and cmake:

sudo apt-get install git automake cmake

Libraries

Install liblpsolve55-dev, libgmp3-dev, libtool, and libboost-dev:

sudo apt-get install liblpsolve55-dev libgmp3-dev libtool libboost-dev

Lua and LuaBind

Download Lua 5.1.5:

wget https://www.lua.org/ftp/lua-5.1.5.tar.gz
tar xvf lua-5.1.5.tar.gz
cd lua-5.1.5

Add the -fPIC compilation flag (and, optionally, -g) to src/Makefile:

CFLAGS= -g -O2 -Wall -fPIC $(MYCFLAGS)

Build the library:

make linux
make local
cd ..

Download LuaBind 0.9.1:

wget https://sourceforge.net/projects/luabind/files/luabind/0.9.1/luabind-0.9.1.tar.gz/download -O luabind-0.9.1.tar.gz
tar xvf luabind-0.9.1.tar.gz
cd luabind-0.9.1

Build the library ($TOOLS points to the directory with the manually installed tools and libraries):

LUA_PATH=$(TOOLS)/lua-5.1.5
bjam --prefix=$(TOOLS)/luabind-0.9.1 install

Install LuaBitOp:

sudo apt-get install luarocks
sudo luarocks install luabitop

SystemC

Download SystemC 2.3.3:

wget https://www.accellera.org/images/downloads/standards/systemc/systemc-2.3.3.tar.gz
tar xvf systemc-2.3.3.tar.gz

Follow the instructions specified in INSTALL.
Set the environment variables ($TOOLS points to the directory with the manually installed tools and libraries):

export SYSTEMC_INCLUDE=$(TOOLS)/systemc-2.3.3/include/
export SYSTEMC_LIBDIR=$(TOOLS)/systemc-2.3.3/lib-linux64/

Verilator

Install Verilator as described here (v4.040 is enough):

git clone https://github.com/verilator/verilator
cd verilator
autoconf
./configure
make
sudo make install

Set the environment variable ($TOOLS points to the directory with the manually installed tools and libraries):

export VERILATOR_ROOT=$(TOOLS)/verilator/

Clang

Download Clang+LLVM 3.1 to be used as Shang's front-end:

wget https://releases.llvm.org/3.1/clang+llvm-3.1-x86_64-linux-ubuntu_12.04.tar.gz
tar xvf clang+llvm-3.1-x86_64-linux-ubuntu_12.04.tar.gz

ABC

Install ABC:

git clone https://github.com/ispras/abc.git abc
cd abc
make ABC_USE_PIC=1 libabc.a

Build Shang

Clone the LLVM sources:

git clone http://llvm.org/git/llvm.git

Reset to the revision 16436dffb50fac4677c7162639f8da0b73eb4e99:

cd llvm
git reset --hard 16436dffb50fac4677c7162639f8da0b73eb4e99

Clone the Shang sources:

cd lib/Target/
git clone https://forge.ispras.ru/git/shang.git VerilogBackend

Apply the patch:

cd ../../
git apply lib/Target/VerilogBackend/util/llvm-16436dffb50fac4677c7162639f8da0b73eb4e99.patch

Create the build folder:

cd ..
mkdir build
cd build

Run cmake with the following flags ($TOOLS points to the directory with the manually installed tools and libraries):

/usr/bin/cmake ../llvm/
    -DCMAKE_BUILD_TYPE=Debug \
    -DENABLE_LOGIC_SYNTHESIS=OFF \
    -DLUA_INCLUDE_DIR=$TOOLS/lua-5.1.5/include \
    -DLUA_LIBRARY=$TOOLS/lua-5.1.5/lib/liblua.a \
    -DLUA_LUAC=$TOOLS/lua-5.1.5/bin/luac \
    -DLUABIND_INCLUDE_DIR=/usr/include \
    -DLUABIND_LIBRARY=$TOOLS/luabind-0.9.1/lib/libluabindd.so \
    -DLPSOLVE_INCLUDE_DIR=/usr/include/lpsolve \
    -DLPSOLVE_LIBRARY=/usr/lib/lp_solve/liblpsolve55.so \
    -DABC_INCLUDE_DIR=$TOOLS/abc \
    -DABC_LIBRARY=$TOOLS/abc/libabc.a \
    -DSYSTEMC_ROOT_DIR=$TOOLS/systemc-2.3.3/ \
    -DVERILATOR_ROOT_DIR=$TOOLS/verilator/

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