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Improve loop unrolling documentation #52099

Merged
merged 1 commit into from Apr 30, 2021
Merged

Improve loop unrolling documentation #52099

merged 1 commit into from Apr 30, 2021

Commits on Apr 29, 2021

  1. Improve loop unrolling documentation 

    Minor cleanups to loop unrolling:
1. Add header comments with documentation
2. Make jitIterSmallOverflow/jitIterSmallUnderflow private static `Compiler`
class members, and not just "loose" functions.
3. Manually loop hoist ITER_LIMIT and UNROLL_LIMIT_SZ and dependent
asserts, plus `iterLimit` setting.

Also, make `optCloneLoops` and `optUnrollLoops` return a PhaseStatus,
so for early-out cases they can return MODIFIED_NOTHING.
    @BruceForstall
    BruceForstall committed Apr 29, 2021
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