34ae308c73
Sometimes SCEV cannot infer nuw/nsw from something as simple as ``` len in [0, MAX_INT] ... iv = phi(0, iv.next) guard(iv <s len) guard(iv <u len) iv.next = iv + 1 ``` just because flag strenthening only relies on definition and does not use local facts. This patch adds support for the simplest case: inference of flags of `add(x, constant)` if we can contextually prove that `x <= max_int - constant`. In case if it has negative CT impact, we can add an option to switch it off. I woudln't expect that though. Differential Revision: https://reviews.llvm.org/D129643 Reviewed By: apilipenko |
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README.txt
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