[llvm-dev] Reversion of rL292621 caused about 7% performance regressions on Cortex-M

[Evgeny Astigeevich via llvm-dev]

Hi Wei,

Your reversion of rL292621 caused about 7% performance regressions in our benchmark on Cortex-M7/M4.
In your commit comment I see it causes build bot failures.
What kind are the failures? Compiler crashes or incorrect code generation?  Will you fix them?
We are interested in the changes because of performance improvements they give.

Kind regards,
Evgeny Astigeevich
Senior Compiler Engineer
Compilation Tools
ARM

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