[llvm] [InstCombine] Fold selects into masked loads (PR #160522)

[Nikita Popov via llvm-commits]

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@@ -4611,5 +4611,16 @@ Instruction *InstCombinerImpl::visitSelectInst(SelectInst &SI) {
       return replaceOperand(SI, 2, ConstantInt::get(FalseVal->getType(), 0));
   }
 
+  Value *MaskedLoadPtr;
+  const APInt *MaskedLoadAlignment;
+  if (match(TrueVal,
+            m_MaskedLoad(m_Value(MaskedLoadPtr), m_APInt(MaskedLoadAlignment),
+                         m_Specific(CondVal), m_Value())))
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nikic wrote:

Needs a one-use check? Otherwise you'll end up with two masked loads.

https://github.com/llvm/llvm-project/pull/160522