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+.. include:: <isonum.txt>
+
+.. _INTRO:GHDL:
+
+What is `GHDL`?
+###############
+
+`GHDL` is a shorthand for G Hardware Design Language. Currently, `G` has no
+meaning.
+
+`GHDL` is a `VHDL` compiler that can execute (nearly) any `VHDL` program. `GHDL`
+is *not* a synthesis tool: you cannot create a netlist with `GHDL`.
+
+Unlike some other simulators, `GHDL` is a compiler: it directly translates a
+`VHDL` file to machine code, using the `GCC` or `LLVM` back-end and without
+using an intermediary language such as `C` or `C++`. Therefore, the compiled
+code should be faster and the analysis time should be shorter than with a
+compiler using an intermediary language.
+
+The Windows\ |trade| version of `GHDL` is not based on `GCC` but on an internal
+code generator.
+
+The current version of `GHDL` does not contain any graphical viewer: you cannot
+see signal waves. You can still check with a test bench. The current version can
+produce a `VCD` file which can be viewed with a wave viewer, as well as `ghw`
+files to be viewed by `gtkwave`.
+
+`GHDL` aims at implementing `VHDL` as defined by IEEE 1076. It supports most of
+the 1987 standard and most features added by the 1993 standard.