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gh-118335: Configure Tier 2 interpreter at build time (#118339)

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The code for Tier 2 is now only compiled when configured
with `--enable-experimental-jit[=yes|interpreter]`.

We drop support for `PYTHON_UOPS` and -`Xuops`,
but you can disable the interpreter or JIT
at runtime by setting `PYTHON_JIT=0`.
You can also build it without enabling it by default
using `--enable-experimental-jit=yes-off`;
enable with `PYTHON_JIT=1`.

On Windows, the `build.bat` script supports
`--experimental-jit`, `--experimental-jit-off`,
`--experimental-interpreter`.

In the C code, `_Py_JIT` is defined as before
when the JIT is enabled; the new variable
`_Py_TIER2` is defined when the JIT *or* the
interpreter is enabled. It is actually a bitmask:
1: JIT; 2: default-off; 4: interpreter.
This commit is contained in:
Guido van Rossum 2024-04-30 18:26:34 -07:00 • committed by GitHub
parent 9c468e2c5d
commit 7d83f7bcc4
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32 changed files with 181 additions and 42 deletions
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12
configure generated vendored
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@ -1818,7 +1818,7 @@ Optional Features:
--disable-gil enable experimental support for running without the
GIL (default is no)
--enable-pystats enable internal statistics gathering (default is no)
--enable-experimental-jit
--enable-experimental-jit[=no|yes|yes-off|interpreter]
build the experimental just-in-time compiler
(default is no)
--enable-optimizations enable expensive, stable optimizations (PGO, etc.)
@ -8229,11 +8229,19 @@ else $as_nop
enable_experimental_jit=no
fi
case $enable_experimental_jit in
no) enable_experimental_jit=no ;;
yes) enable_experimental_jit="-D_Py_JIT -D_Py_TIER2=1" ;;
yes-off) enable_experimental_jit="-D_Py_JIT -D_Py_TIER2=3" ;;
interpreter) enable_experimental_jit="-D_Py_TIER2=4" ;;
interpreter-off) enable_experimental_jit="-D_Py_TIER2=6" ;; # Secret option
*) as_fn_error $? "invalid argument: --enable-experimental-jit=$enable_experimental_jit; expected no|yes|yes-off|interpreter" "$LINENO" 5 ;;
esac
if test "x$enable_experimental_jit" = xno
then :
else $as_nop
as_fn_append CFLAGS_NODIST " -D_Py_JIT"
as_fn_append CFLAGS_NODIST " $enable_experimental_jit"
REGEN_JIT_COMMAND="\$(PYTHON_FOR_REGEN) \$(srcdir)/Tools/jit/build.py $host"
JIT_STENCILS_H="jit_stencils.h"
if test "x$Py_DEBUG" = xtrue