tree a31fd87cc6cf255d0487471fba2deee94f2a83d7
parent 96c723374a28c0f81e4a9512a48b784db0bf4cd0
author Yingwei Zheng <dtcxzyw2333@gmail.com> 1740304358 +0800
committer GitHub <noreply@github.com> 1740304358 +0800
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[LVI] Skip self loops in `solveBlockValueNonLocal` (#127763)

We cannot infer more information from backedges in
`solveBlockValueNonLocal`. However, since DT is unavailable in LVI,
there is not a precise way to check whether a BB edge is a backedge.
This patch only skips self loops to unblock the range analysis.

The motivating case is extracted from
https://github.com/llvm/llvm-project/pull/127663.

Compile-time impact is high:
https://llvm-compile-time-tracker.com/compare.php?from=84ddda58c870681dd12ed765e9d59d5e00567f94&to=af032f1351358f2f5b5d9f4e87c5601c23b9bd37&stat=instructions:u