vector.h
/* |
File: vector.h |
Abstract: |
This file declares some things needed or useful for working with |
vector code. |
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*/ |
#if !defined vector_h |
#define vector_h |
#include <stdint.h> // We need uintptr_t. |
/* Several implementations of vector types are provided as illustration. |
VectorImplementationSelect picks one of them to use. |
*/ |
#define VectorImplementationSelect 0 |
#if VectorImplementationSelect == 0 |
// Define vector types from processor manufacturer specifications. |
#if defined __i386__ || defined __x86_64__ |
#include <emmintrin.h> // Define entities up to and including SSE2. |
typedef __m128 vFloat; |
/* Intel headers are available in steps including: |
mmintrin.h: MMX. |
xmmintrin.h: SSE. |
emmintrin.h: SSE2. |
pmmintrin.h: SSE3. |
tmmintrin.h: SSSE3. |
smmintrin.h: SSSE4 vector operations. |
nmmintrin.h: SSSE4 string operations. |
Intel vector types include: |
__mm128: four floats. |
__m128d: 2 doubles. |
__m128i: 16 8-bit, 8 16-bit, 4 32-bit, or 2 64-bit integers. |
*/ |
#elif defined __ppc__ || defined __ppc64__ |
#include <altivec.h> |
typedef vector float vFloat; |
/* AltiVec extensions can be used either by specifying "-faltivec" |
in the GCC compile command line or by including <altivec.h> and |
specifying "-maltivec" in the compile command line. |
PowerPC/AltiVec vector types include: |
vector float: four floats. |
vector double: two doubles. |
vector signed char, vector unsigned char: 16 8-bit integers. |
vector signed short, vector unsigned short: 8 16-bit integers. |
vector signed int, vector unsigned int: 4 32-bit integers. |
*/ |
#else |
// Define a vector type using a GCC extension to C. |
typedef float vFloat __attribute__((__vector_size__(16))); |
#endif |
#elif VectorImplementationSelect == 1 |
// Define vector types using Accelerate framework. |
#if defined __ppc__ || defined __ppc64__ |
#include <altivec.h> |
#endif |
#include <Accelerate/Accelerate.h> |
#elif VectorImplementationSelect == 2 |
// Define a vector type using a GCC extension to C. |
typedef float vFloat __attribute__((__vector_size__(16))); |
#endif // VectorImplementationSelect == 0 |
#define FloatsPerVector 4 |
/* Return the residue modulo the vector block size of an address. This is the |
byte offset of an address within a vector block. |
*/ |
#define Residue(a) ((uintptr_t) (a) % sizeof(vFloat)) |
// Evaluate to true iff p is aligned to a multiple of the vector size. |
#define IsAligned(p) (Residue(p) == 0) |
#endif // !defined vector_h |
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