Patch 3.14.0a5 PGO on Windows amd64

Author: zanieb

cpython-windows/build.py

@@ -1327,6 +1327,20 @@ def build_cpython(
         )
 
         if pgo:
+            if (
+                meets_python_minimum_version(python_version, "3.14")
+                and build_platform == "x64"
+            ):
+                # On 3.14.0a5, PGO cannot be run on ceval so we disable it there
+                # See https://github.com/python/cpython/pull/130009
+                # We should be able to drop this patch in 3.14.0a6
+                exec_and_log(
+                    ["patch", "-p1", "-i", SUPPORT / "patch-disable-pgo-ceval-3.14.patch"],
+                    str(cpython_source_path),
+                    env,
+                    exit_on_error=False,
+                )
+
             run_msbuild(
                 msbuild,
                 pcbuild_path,

cpython-windows/patch-disable-pgo-ceval-3.14.patch

@@ -0,0 +1,22 @@
+diff --git a/Python/ceval.c b/Python/ceval.c
+index c6a7a0f841f027..5f8f0ae69ef31b 100644
+--- a/Python/ceval.c
++++ b/Python/ceval.c
+@@ -764,15 +764,10 @@ _PyObjectArray_Free(PyObject **array, PyObject **scratch)
+ #define PY_EVAL_C_STACK_UNITS 2
+ 
+ 
+-/* _PyEval_EvalFrameDefault is too large to optimize for speed with PGO on MSVC
+-   when the JIT is enabled or GIL is disabled. Disable that optimization around
+-   this function only. If this is fixed upstream, we should gate this on the
+-   version of MSVC.
++/* _PyEval_EvalFrameDefault is too large to optimize for speed with PGO on MSVC.
+  */
+ #if (defined(_MSC_VER) && \
+-     defined(_Py_USING_PGO) && \
+-     (defined(_Py_JIT) || \
+-      defined(Py_GIL_DISABLED)))
++     defined(_Py_USING_PGO))
+ #define DO_NOT_OPTIMIZE_INTERP_LOOP
+ #endif
+