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authorGuido van Rossum <guido@python.org>2024-04-04 15:03:27 (GMT)
committerGitHub <noreply@github.com>2024-04-04 15:03:27 (GMT)
commit060a96f1a9a901b01ed304aa82b886d248ca1cb6 (patch)
treecb3e95ecac1f90440b7d3752c4aad015ea734bf0 /Python/specialize.c
parent63bbe77d9bb2be4db83ed09b96dd22f2a44ef55b (diff)
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gh-116968: Reimplement Tier 2 counters (#117144)
Introduce a unified 16-bit backoff counter type (``_Py_BackoffCounter``), shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The API used for adaptive specialization counters is changed but the behavior is (supposed to be) identical. The behavior of the Tier 2 counters is changed: - There are no longer dynamic thresholds (we never varied these). - All counters now use the same exponential backoff. - The counter for ``JUMP_BACKWARD`` starts counting down from 16. - The ``temperature`` in side exits starts counting down from 64.
Diffstat (limited to 'Python/specialize.c')
-rw-r--r--Python/specialize.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/Python/specialize.c b/Python/specialize.c
index f1e32d0..0b4b199 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -419,22 +419,20 @@ _PyCode_Quicken(PyCodeObject *code)
int caches = _PyOpcode_Caches[opcode];
if (caches) {
// The initial value depends on the opcode
- int initial_value;
switch (opcode) {
case JUMP_BACKWARD:
- initial_value = 0;
+ instructions[i + 1].counter = initial_jump_backoff_counter();
break;
case POP_JUMP_IF_FALSE:
case POP_JUMP_IF_TRUE:
case POP_JUMP_IF_NONE:
case POP_JUMP_IF_NOT_NONE:
- initial_value = 0x5555; // Alternating 0, 1 bits
+ instructions[i + 1].cache = 0x5555; // Alternating 0, 1 bits
break;
default:
- initial_value = adaptive_counter_warmup();
+ instructions[i + 1].counter = adaptive_counter_warmup();
break;
}
- instructions[i + 1].cache = initial_value;
i += caches;
}
}