Add support for experimental JIT builds (#351)

Author: diegorusso

doc/benchmark.conf.sample

@@ -37,6 +37,20 @@ lto = True
 # Profiled Guided Optimization (PGO)?
 pgo = True
 
+# Build the experimental just-in-time (JIT) compiler?
+# Possible values are:
+# - no: (default) do not build the JIT or the micro-op interpreter.
+#   The new PYTHON_JIT environment variable has no effect.
+# - yes: build the JIT and enable it by default. PYTHON_JIT=0 can be used to
+#   disable it at runtime.
+# - yes-off: build the JIT, but do not enable it by default. PYTHON_JIT=1 can
+#   be used to enable it at runtime.
+# - interpreter: do not build the JIT, but do build and enable the micro-op
+#   interpreter. This is useful for those of us who find ourselves developing
+#   or debugging micro-ops (but don’t want to deal with the JIT).
+#   PYTHON_JIT=0 can be used to disable the micro-op interpreter at runtime.
+jit = no
+
 # The space-separated list of libraries that are package-only,
 # i.e., locally installed but not on header and library paths.
 # For each such library, determine the install path and add an

pyperformance/compile.py

@@ -291,6 +291,8 @@ def compile(self):
             config_args.append('--with-pydebug')
         elif self.conf.lto:
             config_args.append('--with-lto')
+        if self.conf.jit:
+            config_args.append(f'--enable-experimental-jit={self.conf.jit}')
         if self.conf.pkg_only:
             config_args.extend(self.get_package_only_flags())
         if self.conf.debug:
@@ -801,6 +803,7 @@ def getint(section, key, default=None):
         conf.directory = getfile('compile', 'bench_dir')
         conf.lto = getboolean('compile', 'lto', True)
         conf.pgo = getboolean('compile', 'pgo', True)
+        conf.jit = getstr('compile', 'jit', '')
         conf.install = getboolean('compile', 'install', True)
         conf.pkg_only = getstr('compile', 'pkg_only', '').split()
         try:

pyperformance/tests/test_commands.py

@@ -228,6 +228,7 @@ def create_compile_config(self, *revisions,
             bench_dir = {outdir}
             lto = {not fast}
             pgo = {not fast}
+            jit = no
             install = True
 
             [run_benchmark]