LLVM Essentials

Inserting a scalar into a vector

LLVM also provides the API to emit an instruction, which inserts a scalar into a vector type. Note that this vector is different from an array. A vector type is a simple derived type that represents a vector of elements. Vector types are used when multiple primitive data are operated in parallel using single instruction multiple data (SIMD). A vector type requires a size (number of elements) and an underlying primitive data type. For example, we have a vector Vec that has four integers of i32 type <4 x i32>. Now, we want to insert the values 10, 20, 30, and 40 at 0, 1, 2, and 3 indexes of the vector.

The insertelement instruction takes three arguments. The first argument is a value of vector type. The second operand ...