VECTOR

The VECTOR option controls whether the compiler enables the vector programming support and automatically takes advantage of vector/SIMD instructions. The VECTOR option provides potential performance improvements in the following cases:

Binary floating-point data types: float and long double

When the VECTOR option is specified with ARCH(12) and FLOAT(IEEE), the long double and float data types can be processed in the vector registers.

Binary floating-point data type: double

When the VECTOR option is specified with ARCH(11) or higher and FLOAT(IEEE), the double data types can be processed in the vector registers.

Built-in library functions

When the VECTOR option is specified with ARCH(11) or higher, certain built-in library functions can take advantage of vector string instructions to accelerate the processing of strings of character data.

Fixed-point decimal operations

When the VECTOR option is specified with ARCH(12), the compiler can take advantage of vector decimal instructions that perform the operations in register operands, which can improve the performance of such applications.

SIMD instructions

When the AUTOSIMD suboption is in effect, the compiler generates code, when possible, using the SIMD instructions. SIMD instructions calculate several results at one time, which is faster than calculating each result sequentially.