[PATCH] D118037: [DAGCombine] Consider SETULT as carry flag

[Paweł Bylica via Phabricator via llvm-commits]

chfast added a comment.

On the high level note, using __builtin_subc() or __builtin_sub_with_overflow() is good enough workaround.

I also think it would be very nice to have generic addc/subc intrinsic on LLVM IR level. Then many of these carry matching could be done in LLVM IR.


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  https://reviews.llvm.org/D118037/new/

https://reviews.llvm.org/D118037