vec_literal.h

Newlib 嵌入式 C库 标准实现代码

/*
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#ifndef _VEC_LITERAL_H_
#define _VEC_LITERAL_H_

/* This header files provides an abstraction for the various implementations
 * of vector literal construction. The two formats are:
 *
 * 1) Altivec styled using parenthesis
 * 2) C grammer friendly styled using curly braces
 *
 * The macro, VEC_LITERAL has been developed to provide some portability
 * in these two styles. To achieve true portability, user must specify all
 * elements of the vector being initialized. A single element can be provided
 * but only the first element guarenteed across both construction styles.
 *
 * The VEC_SPLAT_* macros have been provided for portability of vector literal
 * construction when all the elements of the vector contain the same value.
 */

/* Use curly brace style.
 */
#define VEC_LITERAL(_type, ...)	((_type){__VA_ARGS__})

#define VEC_SPLAT_U8(_val)	((__vector unsigned char){_val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val})
#define VEC_SPLAT_S8(_val)	((__vector signed char){_val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val, _val})

#define VEC_SPLAT_U16(_val)	((__vector unsigned short){_val, _val, _val, _val, _val, _val, _val, _val})
#define VEC_SPLAT_S16(_val)	((__vector signed short){_val, _val, _val, _val, _val, _val, _val, _val})

#define VEC_SPLAT_U32(_val)	((__vector unsigned int){_val, _val, _val, _val})
#define VEC_SPLAT_S32(_val)	((__vector signed int){_val, _val, _val, _val})
#define VEC_SPLAT_F32(_val)	((__vector float){_val, _val, _val, _val})

#define VEC_SPLAT_U64(_val)	((__vector unsigned long long){_val, _val})
#define VEC_SPLAT_S64(_val)	((__vector signed long long){_val, _val})
#define VEC_SPLAT_F64(_val)	((__vector double){_val, _val})

#endif /* _VEC_LITERAL_H_ */