1//===- InstCombineVectorOps.cpp -------------------------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//

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20/// CheapToScalarize - Return true if the value is cheaper to scalarize than it
21/// is to leave as a vector operation. isConstant indicates whether we're
22/// extracting one known element. If false we're extracting a variable index.
23static bool CheapToScalarize(Value *V, bool isConstant) {
24 if (Constant *C = dyn_cast<Constant>(V)) {
25 if (isConstant) return true;
26
27 // If all elts are the same, we can extract it and use any of the values.
28 if (Constant *Op0 = C->getAggregateElement(0U)) {
29 for (unsigned i = 1, e = V->getType()->getVectorNumElements(); i != e;
30 ++i)
31 if (C->getAggregateElement(i) != Op0)
32 return false;
33 return true;
34 }
35 }
36 Instruction *I = dyn_cast<Instruction>(V);
37 if (!I) return false;
38
39 // Insert element gets simplified to the inserted element or is deleted if
40 // this is constant idx extract element and its a constant idx insertelt.
41 if (I->getOpcode() == Instruction::InsertElement && isConstant &&
42 isa<ConstantInt>(I->getOperand(2)))

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