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Update docs on firrtl compile

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Jerry Zhao
2024-04-22 20:09:18 -07:00
parent a152e0af69
commit 5992f0e0f7
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docs/Customization/Firrtl-Transforms.rst
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@@ -8,11 +8,9 @@ modify Chisel-elaborated RTL.
As mentioned in Section :ref:`Tools/FIRRTL:firrtl`, transforms are modifications that happen on the FIRRTL IR that can modify a circuit. As mentioned in Section :ref:`Tools/FIRRTL:firrtl`, transforms are modifications that happen on the FIRRTL IR that can modify a circuit.
Transforms are a powerful tool to take in the FIRRTL IR that is emitted from Chisel and run analysis or convert the circuit into a new form. Transforms are a powerful tool to take in the FIRRTL IR that is emitted from Chisel and run analysis or convert the circuit into a new form.
The Scala FIRRTL Compiler and the MLIR FIRRTL Compiler The MLIR FIRRTL Compiler
------------------------------------------------------ ------------------------------------------------------
In Chipyard, two FIRRTL compilers work together to compile Chisel into Verilog. The Scala FIRRTL compiler (SFC) and the MLIR FIRRTL compiler (MFC). In Chipyard, the LLVM-based MLIR FIRRTL compiler (CIRCT or MFC) compiles Chisel into Verilog.
They are basically doing the same thing, except that MFC is written in C++ which makes compilation much faster (the generated Verilog will be different). In the default setting, the SFC will compile Chisel into CHIRRTL and MFC will
compile CHIRRTL into Verilog.
For more information on MLIR FIRRTL Compiler, please visit https://mlir.llvm.org/ and https://circt.llvm.org/. For more information on MLIR FIRRTL Compiler, please visit https://mlir.llvm.org/ and https://circt.llvm.org/.