[all-commits] [llvm/llvm-project] acf86c: [CVP] Keep `ReachableCaseCount` in sync with range...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: acf86c5c4dbe8a65581f5438a61a8dddc4d02b6d
      https://github.com/llvm/llvm-project/commit/acf86c5c4dbe8a65581f5438a61a8dddc4d02b6d
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2025-06-11 (Wed, 11 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
    M llvm/test/Transforms/CorrelatedValuePropagation/switch.ll

  Log Message:
  -----------
  [CVP] Keep `ReachableCaseCount` in sync with range of condition (#142302)

https://github.com/llvm/llvm-project/pull/79993 assumes that a reachable
case must be contained by `CR`. However, it doesn't hold for some edge
cases. This patch adds additional checks to ensure `ReachableCaseCount`
is correct.

Note: Similar optimization in SCCP isn't affected by this bug because it
uses `CR` to compute `ReachableCaseCount`.

Closes https://github.com/llvm/llvm-project/issues/142286.



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