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24 lines
1018 B
24 lines
1018 B
---
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title: "Loop Hoisting"
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description: "Detect opportunities to hoist function calls that are invariant outside of loop bodies for efficiency."
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---
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Detect opportunities to hoist function calls that are invariant outside of loop bodies for efficiency.
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Activate with `--loop-hoisting`.
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Supported languages:
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- C/C++/ObjC: Yes
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- Java: Yes
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This checker detects opportunities to hoist function calls that are invariant to outside of loop bodies. The hoisting analysis relies on [purity](/docs/checker-purity) analysis to determine whather a function is pure or not.
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It has an additional mode that reports [loop-invariant functions that are expensive](/docs/all-issue-types#expensive_loop_invariant_call) (i.e. at least linear). This is enabled by the flag `--hoisting-report-only-expensive`.
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## List of Issue Types
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The following issue types are reported by this checker:
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- [EXPENSIVE_LOOP_INVARIANT_CALL](/docs/all-issue-types#expensive_loop_invariant_call)
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- [INVARIANT_CALL](/docs/all-issue-types#invariant_call)
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