[llvm] [InstCombine] Fold binary op of reductions. (PR #121567)

[Yingwei Zheng via llvm-commits]

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@@ -2296,6 +2296,58 @@ Instruction *InstCombinerImpl::foldVectorBinop(BinaryOperator &Inst) {
   return nullptr;
 }
 
+static Intrinsic::ID getReductionForBinop(Instruction::BinaryOps Opc) {
+  switch (Opc) {
+  default:
+    break;
+  case Instruction::Add:
+    return Intrinsic::vector_reduce_add;
+  case Instruction::Mul:
+    return Intrinsic::vector_reduce_mul;
+  case Instruction::And:
+    return Intrinsic::vector_reduce_and;
+  case Instruction::Or:
+    return Intrinsic::vector_reduce_or;
+  case Instruction::Xor:
+    return Intrinsic::vector_reduce_xor;
+  }
+  return Intrinsic::num_intrinsics;
+}
+
+Instruction *InstCombinerImpl::foldBinopOfReductions(BinaryOperator &Inst) {
+  IntrinsicInst *II0 = dyn_cast<IntrinsicInst>(Inst.getOperand(0));
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dtcxzyw wrote:

Missing one-use check

https://github.com/llvm/llvm-project/pull/121567