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| author | Guido van Rossum <guido@python.org> | 2022-04-21 18:53:57 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-04-21 18:53:57 (GMT) |
| commit | f8dc6186d1857a19edd182277a9d78e6d6cc3787 (patch) | |
| tree | e85e859c1999d95ce7cc6402068f84efad807e1f /Include/cpython | |
| parent | d44815cabc0a8d9932df2fa95cb374eadddb7c17 (diff) | |
| download | cpython-f8dc6186d1857a19edd182277a9d78e6d6cc3787.zip cpython-f8dc6186d1857a19edd182277a9d78e6d6cc3787.tar.gz cpython-f8dc6186d1857a19edd182277a9d78e6d6cc3787.tar.bz2 | |
GH-91719: Make MSVC generate somewhat faster switch code (#91718)
Apparently a switch on an 8-bit quantity where all cases are
present generates a more efficient jump (doing only one indexed
memory load instead of two).
So we make opcode and use_tracing uint8_t, and generate a macro
full of extra `case NNN:` lines for all unused opcodes.
See https://github.com/faster-cpython/ideas/issues/321#issuecomment-1103263673
Diffstat (limited to 'Include/cpython')
| -rw-r--r-- | Include/cpython/pystate.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Include/cpython/pystate.h b/Include/cpython/pystate.h index 1af21a2..2bd4606 100644 --- a/Include/cpython/pystate.h +++ b/Include/cpython/pystate.h @@ -46,7 +46,7 @@ typedef struct _PyCFrame { * discipline and make sure that instances of this struct cannot * accessed outside of their lifetime. */ - int use_tracing; + uint8_t use_tracing; // 0 or 255 (or'ed into opcode, hence 8-bit type) /* Pointer to the currently executing frame (it can be NULL) */ struct _PyInterpreterFrame *current_frame; struct _PyCFrame *previous; |