C libfirm Projects

libfirm

2 451 5.2 C

graph based intermediate representation and backend for optimising compilers
cparser

2 318 4.6 C

C99 parser and frontend for libfirm

Project mention: Compiling History: A brief tour of C compilers | news.ycombinator.com | 2024-02-14

> QBE is a new optimizing backend much simpler than LLVM; cproc and cparser are two of the C compilers that target it, in addition to its own minic.
I thought cparser targeted libFirm. That's what their GitHub page says [0].
"It acts as a frontend to the libFirm intermediate representation library."
> We really need a production quality open source C compiler that is actually written in C.
I honestly think cproc or cparser are almost there already. For cproc, you just need to improve the quality of code optimization; it's really QBE you'd need to change. For example, you could change unnecessary multiplications by powers of 2 into left shifts, improve instruction selection so that subtraction is always something like "sub rax, rdi" and not "neg rdi / add rax, rdi" [1]).
For cparser, I notice slightly higher quality codegen; libFirm just needs more architecture support (e.g. AMD64 support appears to work for me, but it's labeled as experimental).
[0]: https://github.com/libfirm/cparser
[1]: I'm pretty sure this is the line of code that generates it, too: https://c9x.me/git/qbe.git/tree/amd64/emit.c#n418

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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).