ZJIT: Eliminate GuardType on frozen objects #913
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tobi
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When GuardType operates on a value that is a known frozen object (from a constant), we can check at compile time if the object's type matches the guard. Since frozen objects cannot change their class, the runtime guard becomes unnecessary. This optimization eliminates redundant type guards when accessing methods on frozen constant objects, complementing the LoadField folding for ivar reads. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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tekknolagi
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Dec 12, 2025
| self.make_equal_to(insn_id, val); | ||
| continue; | ||
| } | ||
| // If GuardType is on a frozen object, we can check at compile time if the |
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I think this should be implied by the is_a in the existing code; we can generally infer types from constant objects (VALUE pointers). Ideally we instead eliminate GuardShape instructions, which we don't have yet
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I think I misspoke when I said we needed to eliminate GuardType, sorry!
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Summary
Test plan
🤖 Generated with Claude Code