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-# Lightening
-
-Lightening is a just-in-time code generation library derived from GNU
-Lightning, adapted to the purposes of the GNU Guile project.
-
-## Use
-
-```
-gcc -flto -O2 -g -o lightening.o -c lightening/lightening.c
-gcc -flto -O2 -g -o my-program lightening.o my-program.c
-```
-
-See the GNU Lightning manual for more on how to program against
-Lightening (much of the details are the same).
-
-## What's the difference with GNU Lightning?
-
-This project is called Lightening because it's lighter-weight than GNU
-Lightning.  When you go to generate code at run-time with GNU Lightning,
-what happens is that you build up a graph of nodes which GNU Lightning
-"optimizes" before finally emitting machine code.  These optimizations
-can improve register allocation around call sites.  However they are not
-helpful from a Guile perspective, as they get in the way of register
-allocation that we need to do; and they actually prevent access to all
-the registers that we would like to have.
-
-Guile needs a simple, light-weight code generation library.  The GNU
-Lightning architecture-specific backends provide the bulk of this
-functionality, and Lightening wraps it all in a lightweight API.
-
-## Supported targets
-
-Lightening can generate code for the x86-64, i686, ARMv7, and AArch64
-architectures.  It supports the calling conventions of MS Windows,
-GNU/Linux, and Mac OS.
-
-On i686, Lightening requires SSE support.  On ARMv7, we require hardware
-floating-point support (the VFP instructions), as well as the UDIV/SDIV
-instructions.
-
-Lightening is automatically tested using GitLab's continuous integration
-for under the supported architectures, for GNU/Linux; for a list of
-recent jobs, see [the CI
-page](https://gitlab.com/wingo/lightening/-/jobs).
-
-## Future targets
-
-Lightening has some inherited code from GNU Lightning for MIPS, PPC64,
-and s390.  Patches to adapt this code to the Lightening code structure
-are quite welcome.
-
-RISC-V support would be fun too.
-
-## Status
-
-Lightening is used in GNU Guile since version 2.9.2 and seems to work
-well.