[llvm-dev] X86ISelLowering: Promote 'add nsw' to a wider type

[Artur Pilipenko via llvm-dev]

Hi Sanjay,

Some time ago you implemented a sext(add_nsw(x, C)) --> add(sext(x), C_sext) transformation in X86ISelLowering
https://reviews.llvm.org/D13757
Is there any reason why this transformation is limited to sexts and doesn’t support zexts?

Thanks,
Artur
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