CODEWITHSUNDEEP
c++llvmllvm-ir
jap
jap

Reputation: 627

Create global vector using LLVM IR Builder

I want to build up LLVM IR for the following expression to add a scalar to a vector

[1,2,3,4]+1

I have found the correct methods to create the add and the scalar expression but not for the vector.

Value *L = //Missing code here
Value *R = ConstantFP::get(getGlobalContext(), APFloat(Val));
Value *exp = Builder.CreateFAdd(L, R, "addresult");

How can I generate this vector?

Upvotes: 0

Views: 2165

Answers (1)

Marco A.
Marco A.

Reputation: 43662

First make sure you actually need a vector i.e. a datatype on which you can operate in parallel (SIMD/SIMT fashion) and not a simple array.

After that make also sure the type you intend to use is right (APFloat is arbitrary precision float).

Creating a vector can proceed in the same way you add elements via insertelement

  Type* u32Ty = Type::getInt32Ty( llvmContext );
  Type* vecTy = VectorType::get(u32Ty, 4);
  Value* emptyVec = UndefValue::get(vecTy);
  Constant* index0 =  Constant::getIntegerValue(u32Ty, llvm::APInt(32, 0));
  Value* insert1 = InsertElementInst(/*First integer value*/, emptyVec, index0, 0);

Upvotes: 1

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