Guido van Rossum cabd6e8a10 gh-106529: Support JUMP_BACKWARD in Tier 2 (uops) (#106543) ...

During superblock generation, a JUMP_BACKWARD instruction is translated to either a JUMP_TO_TOP micro-op (when the target of the jump is exactly the beginning of the superblock, closing the loop), or a SAVE_IP + EXIT_TRACE pair, when the jump goes elsewhere.

The new JUMP_TO_TOP instruction includes a CHECK_EVAL_BREAKER() call, so a closed loop can still be interrupted.

2023-07-11 18:08:10 +00:00

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