https://github.com/python/cpython/commit/26a74203f08c59922b4889931c108b34c4ee8e72
commit: 26a74203f08c59922b4889931c108b34c4ee8e72
branch: main
author: Brandt Bucher <[email protected]>
committer: brandtbucher <[email protected]>
date: 2024-09-27T09:38:04-07:00
summary:

GH-118093: Fix off-by-one errors in tier-up thresholds (GH-124447)

files:
M Include/internal/pycore_backoff.h

diff --git a/Include/internal/pycore_backoff.h 
b/Include/internal/pycore_backoff.h
index 3db3aa3eb77879..a9d1bce127e63d 100644
--- a/Include/internal/pycore_backoff.h
+++ b/Include/internal/pycore_backoff.h
@@ -108,7 +108,7 @@ backoff_counter_triggers(_Py_BackoffCounter counter)
 /* Initial JUMP_BACKWARD counter.
  * This determines when we create a trace for a loop.
 * Backoff sequence 16, 32, 64, 128, 256, 512, 1024, 2048, 4096. */
-#define JUMP_BACKWARD_INITIAL_VALUE 16
+#define JUMP_BACKWARD_INITIAL_VALUE 15
 #define JUMP_BACKWARD_INITIAL_BACKOFF 4
 static inline _Py_BackoffCounter
 initial_jump_backoff_counter(void)
@@ -122,7 +122,7 @@ initial_jump_backoff_counter(void)
  * otherwise when a side exit warms up we may construct
  * a new trace before the Tier 1 code has properly re-specialized.
  * Backoff sequence 64, 128, 256, 512, 1024, 2048, 4096. */
-#define SIDE_EXIT_INITIAL_VALUE 64
+#define SIDE_EXIT_INITIAL_VALUE 63
 #define SIDE_EXIT_INITIAL_BACKOFF 6
 
 static inline _Py_BackoffCounter

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