[llvm] [SLP] SLP's copyable elements based upon Main/Alt operations. (PR #124242)

[Alexey Bataev via llvm-commits]

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@@ -594,6 +598,40 @@ static std::optional<unsigned> getElementIndex(const Value *Inst,
   return Index;
 }
 
+/// Checks if the \p Opcode can be considered as an operand of a (possibly)
+/// binary operation \p I.
+/// \returns The code of the binary operation of instruction \p I if the
+/// instruction with \p Opcode can be considered as an operand of \p I with the
+/// default value.
+static unsigned tryToRepresentAsInstArg(unsigned Opcode, Instruction *I) {
+  if (Opcode != Instruction::PHI && Opcode != Instruction::Invoke &&
+      (I->getOpcode() == Instruction::Add ||
+       I->getOpcode() == Instruction::And ||
+       I->getOpcode() == Instruction::AShr ||
+       I->getOpcode() == Instruction::BitCast ||
+       I->getOpcode() == Instruction::Call ||
+       // Issue with scheduling with isVectorLikeInstWithConstOps
+       // operations.
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alexey-bataev wrote:

Then drop them completely from the list

https://github.com/llvm/llvm-project/pull/124242