[llvm] [InstCombine] Missed optimization for select a%2==0, (a/2*2)*(a/2*2), 0 (PR #92658)

[Jorge Botto via llvm-commits]

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@@ -1073,6 +1073,50 @@ static Value *foldAbsDiff(ICmpInst *Cmp, Value *TVal, Value *FVal,
   return nullptr;
 }
 
+// When the lsb of cond is 0:
+// cond ? A & -2 : B --> cond ? A : B
+// cond ? BinOp (A & -2), (A & -2) : B --> cond ? BinOp A, A : B
+static Value *foldSelectWithIcmpEqAndPattern(ICmpInst *Cmp, Value *TVal,
+                                             Value *FVal,
+                                             InstCombiner::BuilderTy &Builder,
+                                             SelectInst &SI,
+                                             InstCombinerImpl &IC) {
+
+  Value *A;
+  ConstantInt *MaskedConstant;
+
+  // Checks if true branche matches the pattern 'A % 2'.
+  if (match(TVal,
+            m_OneUse(m_c_And(m_Value(A), m_ConstantInt(MaskedConstant)))) &&
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jf-botto wrote:

Thank you. Will fix it in my next commit.

https://github.com/llvm/llvm-project/pull/92658