https://github.com/python/cpython/commit/a12c10590828cd840679f44ed1a92f2d970eb940 commit: a12c10590828cd840679f44ed1a92f2d970eb940 branch: 3.13 author: Miss Islington (bot) <[email protected]> committer: brandtbucher <[email protected]> date: 2024-07-17T22:18:39Z summary:
[3.13] Add note about PYTHON_JIT environment variable to JIT README (GH-121942) (cherry picked from commit f113c1a2a9d4fb2860de1bd8c05677f00fd49bd9) Co-authored-by: Savannah Ostrowski <[email protected]> files: M Tools/jit/README.md diff --git a/Tools/jit/README.md b/Tools/jit/README.md index 73d2deebbbc216..bc6f793b296f12 100644 --- a/Tools/jit/README.md +++ b/Tools/jit/README.md @@ -1,7 +1,7 @@ The JIT Compiler ================ -This version of CPython can be built with an experimental just-in-time compiler. While most everything you already know about building and using CPython is unchanged, you will probably need to install a compatible version of LLVM first. +This version of CPython can be built with an experimental just-in-time compiler[^pep-744]. While most everything you already know about building and using CPython is unchanged, you will probably need to install a compatible version of LLVM first. ## Installing LLVM @@ -57,6 +57,10 @@ For `PCbuild`-based builds, pass the new `--experimental-jit` option to `build.b For all other builds, pass the new `--enable-experimental-jit` option to `configure`. -Otherwise, just configure and build as you normally would. Cross-compiling "just works", since the JIT is built for the host platform. +Otherwise, just configure and build as you normally would. Cross-compiling "just works", since the JIT is built for the host platform. + +The JIT can also be enabled or disabled using the `PYTHON_JIT` environment variable, even on builds where it is enabled or disabled by default. More details about configuring CPython with the JIT and optional values for `--enable-experimental-jit` can be found [here](https://docs.python.org/dev/whatsnew/3.13.html#experimental-jit-compiler). + +[^pep-744]: [PEP 744](https://peps.python.org/pep-0744/) [^why-llvm]: Clang is specifically needed because it's the only C compiler with support for guaranteed tail calls (`musttail`), which are required by CPython's continuation-passing-style approach to JIT compilation. Since LLVM also includes other functionalities we need (namely, object file parsing and disassembly), it's convenient to only support one toolchain at this time. _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-checkins.python.org/ Member address: [email protected]
