[llvm] [ValueTracking] Handle trunc to i1 as condition in dominating condition. (PR #126414)

[Nikita Popov via llvm-commits]

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@@ -801,6 +801,22 @@ static void computeKnownBitsFromCond(const Value *V, Value *Cond,
 
   if (auto *Cmp = dyn_cast<ICmpInst>(Cond))
     computeKnownBitsFromICmpCond(V, Cmp, Known, SQ, Invert);
+
+  if (match(Cond, m_Not(m_Value(Cond))))
+    Invert = !Invert;
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nikic wrote:

Can you please split this off into a followup change? I think it makes sense to handle it, but if we do so, we should do it generically, not for trunc conditions in particular.

https://github.com/llvm/llvm-project/pull/126414