JIT: Redundant bounds check is not eliminated

[EgorBo]

A tracking issue to link all cases currently not optimized by RyuJIT around bounds checking. Contributes to #94941

Checks inside loops

• JIT does not hoist bound check outside a loop #69194
• Optimization of array bounds checks involving bitwise AND could be improved #65550
• Loops aren't cloned for Spans #82946
• Redundant bounds check #104890
• Bounds checks are no longer elided when using nint for indexing. #44415
• Elide bounds checks for partial array/span iteration #31638
• JIT: Index use can't be completely optimized away #11870
• [JIT] Elide bounds check for reverse iteration over arrays and spans #9505

Multidimensional arrays

• JIT: Unnecessary bounds checks for MD array accesses #103321
• Loop cloning can't eliminate bounds check when assigning to multi-dim jagged array #54074

Miscellaneous

• Codegen: Bound check not elided in ref struct Span field index access #72004
• JIT: Improve rangecheck for certain binops #79257
• C# value discard leads to range check for happy path #99943
• Manual bounds checks are less efficient #80256
• Extra bound checks are not eliminated for pinning #35748
• [JIT] Redundant Span<> bounds check not elided for fields in ref structs #10645
• Use stelm.ref helper calls towards array bounds check assertions and range check elimination #8096
• Redundant bounds check for arr[X >> CNS] pattern #109899
• JIT: Redundant bound check #111027

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[neon-sunset]

Not sure if the issue #109043 belongs here too since it does not go through normal bounds check but otherwise seems related.

[MichalPetryka]

This should also include reverse loops, iterating over multiple collections at once and non 1 increments.

[EgorBo]

Not sure if the issue #109043 belongs here too since it does not go through normal bounds check but otherwise seems related.

I think it indeed duplicates #80256
We're going to close/merge some of these issues as duplicates

This should also include reverse loops, iterating over multiple collections at once and non 1 increments.

It's in the list already - #9505