[llvm] [GVN] Replace icmp samesign with icmp flipped signedness (PR #227855)

[Nikita Popov via llvm-commits]

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@@ -3477,6 +3477,21 @@ bool GVNPass::processInstruction(Instruction *I) {
           return true;
         }
       }
+      auto *ICmp = dyn_cast<ICmpInst>(Cmp);
+      if (ICmp && ICmp->hasSameSign()) {
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nikic wrote:

Check for !isEquality here? It can have samesign, but flipped pred is the same.

https://github.com/llvm/llvm-project/pull/227855