Extensions for vector processing support

The vector extensions are only accepted when all of the following conditions are met:

The -qarch option is set to a target architecture that supports vector processing instructions. For example, an architecture that supports the VSX instruction set extensions, such as POWER7, requires -qarch=pwr7.
The -qaltivec option is in effect.

Table 1. IBM XL C extensions to support the AltiVec Application Programming Interface specification
Language feature	Discussed in:
Vector programming language extensions	Vector types (IBM extension), Vector literals (IBM extension)

The following features are IBM extensions to the AltiVec Application Programming Interface specification:

Table 2. IBM XL C extensions to the AltiVec Application Programming Interface specification
Language extension	Discussed in:
Initializer lists for vectors	Initialization of vectors (IBM extension)
`typedef` definitions for vector types	typedef definitions
compound literals as initializers for static vector variables	Compound literal expressions (C only)
vector types as arguments to the `__alignof__` and `typeof` operators	The __alignof__ operator (IBM extension), The typeof operator (IBM extension)

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