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| author | mpage <mpage@meta.com> | 2025-04-09 10:34:12 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-04-09 10:34:12 -0700 |
| commit | 1f5682f3a27516833f7c317707dd359280dba6e7 (patch) | |
| tree | 0cd8df35732c9d441c9405156f5308027ae25eaf /Python | |
| parent | 67ded6a4faae29edff8e4f7886978e71ce116e33 (diff) | |
| download | cpython-1f5682f3a27516833f7c317707dd359280dba6e7.tar.gz cpython-1f5682f3a27516833f7c317707dd359280dba6e7.zip | |
gh-129987: Disable GCC SLP autovectorization for the interpreter loop on x86-64 (#132295)
The SLP autovectorizer can cause poor code generation for opcode dispatch, negating any benefit we get from vectorization elsewhere in the interpreter loop.
Diffstat (limited to 'Python')
| -rw-r--r-- | Python/ceval.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/Python/ceval.c b/Python/ceval.c index a59b2b7a168..47d068edac2 100644 --- a/Python/ceval.c +++ b/Python/ceval.c @@ -948,7 +948,18 @@ _PyObjectArray_Free(PyObject **array, PyObject **scratch) #include "generated_cases.c.h" #endif -PyObject* _Py_HOT_FUNCTION +#if (defined(__GNUC__) && !defined(__clang__)) && defined(__x86_64__) +/* + * gh-129987: The SLP autovectorizer can cause poor code generation for opcode + * dispatch, negating any benefit we get from vectorization elsewhere in the + * interpreter loop. + */ +#define DONT_SLP_VECTORIZE __attribute__((optimize ("no-tree-slp-vectorize"))) +#else +#define DONT_SLP_VECTORIZE +#endif + +PyObject* _Py_HOT_FUNCTION DONT_SLP_VECTORIZE _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag) { _Py_EnsureTstateNotNULL(tstate); |