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gh-106529: Support JUMP_BACKWARD in Tier 2 (uops) (#106543)

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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.
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Guido van Rossum 2023-07-11 11:08:10 -07:00 • committed by GitHub
parent 292ac4bfe9
commit cabd6e8a10
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5 changed files with 63 additions and 30 deletions
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Tools/cases_generator/generate_cases.py
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@ -1346,6 +1346,7 @@ class Analyzer:
add("SAVE_IP")
add("_POP_JUMP_IF_FALSE")
add("_POP_JUMP_IF_TRUE")
add("JUMP_TO_TOP")
for instr in self.instrs.values():
if instr.kind == "op" and instr.is_viable_uop():