[llvm] [ValueTracking] Improve KnownBits for signed min-max clamping (PR #120576)

[via llvm-commits]

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+; RUN: opt < %s -passes=aggressive-instcombine -mtriple=x86_64 -S | FileCheck %s
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adam-bzowski wrote:

Done. I also added one more vectorial test.

https://github.com/llvm/llvm-project/pull/120576