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All the unrolling makes it hard for llvm to optimize it out. Sample: https://godbolt.org/g/R9nLvC
#45501 has a fix that involves assume(index < len)
but we couldn't quite get it to pass tests. Will need to give it another try with some fresh eyes.
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Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Category: An issue proposing an enhancement or a PR with one.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.Issue: Problems and improvements with respect to performance of generated code.Relevant to the compiler team, which will review and decide on the PR/issue.