[llvm] [ValueTracking] Handle non-canonical operand order in `isImpliedCondICmps` (PR #85575)

[via llvm-commits]

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@@ -8532,6 +8532,15 @@ static std::optional<bool> isImpliedCondICmps(const ICmpInst *LHS,
   CmpInst::Predicate LPred =
       LHSIsTrue ? LHS->getPredicate() : LHS->getInversePredicate();
 
+  // We can have non-canonical operands here so canonicalize constant to L1/R1.
+  if (match(L0, m_ImmConstant())) {
+    std::swap(L0, L1);
+    LPred = ICmpInst::getSwappedPredicate(LPred);
+  }
+  if (match(R0, m_ImmConstant())) {
+    std::swap(R0, R1);
+    RPred = ICmpInst::getSwappedPredicate(RPred);
+  }
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goldsteinn wrote:

Yup with a little bit more work in the initial swaps.

https://github.com/llvm/llvm-project/pull/85575