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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 -------------- next part -------------- An HTML attachment was scrubbed... URL:

...backend: What is the current status of this work? Does it make sense to patch the existing code in X86ISelLowering in order to support looking through zext or the generic solution will be available soon? Artur https://reviews.llvm.org/D22421 https://reviews.llvm.org/D22271 https://reviews.llvm.org/D22477 https://reviews.llvm.org/D20774 https://llvm.org/bugs/show_bug.cgi?id=27925 I'm very interested to see what kinds of patterns you're seeing and want to optimize. It's possible that IR transforms could eliminate the need for the backend fixups...or it could make them harder. Are there b...