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// Vectorise using IBM's Altivec (Power)
// Use the type vector double directly, without introducing a wrapper class
// Use macros instead of inline functions
#include <altivec.h>
// Vector type corresponding to CCTK_REAL
#define CCTK_REAL4_VEC vector float
// Number of vector elements in a CCTK_REAL_VEC
#define CCTK_REAL4_VEC_SIZE 4
// Create vectors, extract vector elements
#define vec4_set1(a) (vec_splats(a))
#define vec4_set(a,b,c,d) \
({ \
CCTK_REAL4_VEC x; \
x[0]=(a); \
x[1]=(b); \
x[2]=(c); \
x[3]=(d); \
x; \
})
#define vec4_elt0(x) ((x)[0])
#define vec4_elt1(x) ((x)[1])
#define vec4_elt2(x) ((x)[2])
#define vec4_elt3(x) ((x)[3])
#define vec4_elt(x,d) ((x)[d])
// Load and store vectors
// Load a vector from memory (aligned and unaligned); this loads from
// a reference to a scalar
#define vec4_load(p) (*(CCTK_REAL4_VEC const*)&(p))
#define vec4_loadu(p) (*(CCTK_REAL4_VEC const*)&(p))
// Load a vector from memory that may or may not be aligned, as
// decided by the offset and the vector size
#define vec4_loadu_maybe(off,p) (vec4_loadu(p))
#define vec4_loadu_maybe3(off1,off2,off3,p) (vec4_loadu(p))
// Store a vector to memory (aligned and non-temporal); this stores to
// a reference to a scalar
#define vec4_store(p,x) (*(CCTK_REAL4_VEC*)&(p)=(x))
#define vec4_storeu(p,x) (*(CCTK_REAL4_VEC*)&(p)=(x))
// TODO: Use stvxl instruction?
#define vec4_store_nta(p,x) (*(CCTK_REAL4_VEC*)&(p)=(x))
// Store a lower or higher partial vector (aligned and non-temporal);
// the non-temporal hint is probably ignored
#define vec4_store_nta_partial_lo(p,x,n) \
({ \
switch (n) { \
case 3: ((&(p))[2]=(x)[2]); \
case 2: ((&(p))[1]=(x)[1]); \
case 1: ((&(p))[0]=(x)[0]); \
} \
})
#define vec4_store_nta_partial_hi(p,x,n) \
({ \
switch (n) { \
case 3: ((&(p))[1]=(x)[1]); \
case 2: ((&(p))[2]=(x)[2]); \
case 1: ((&(p))[3]=(x)[3]); \
} \
})
// Functions and operators
// Operators
#define k4pos(x) (+(x))
#define k4neg(x) (-(x))
#define k4add(x,y) ((x)+(y))
#define k4sub(x,y) ((x)-(y))
#define k4mul(x,y) ((x)*(y))
#define k4div(x,y) ((x)/(y))
// Fused multiply-add, defined as [+-]x*y[+-]z
#define k4madd(x,y,z) (vec_madd(x,y,z))
#define k4msub(x,y,z) (vec_msub(x,y,z))
#define k4nmadd(x,y,z) (vec_nmadd(x,y,z))
#define k4nmsub(x,y,z) (vec_nmsub(x,y,z))
// Cheap functions
#define k4fabs(x) (vec_abs(x))
#define k4fmax(x,y) (vec_max(x,y))
#define k4fmin(x,y) (vec_min(x,y))
#define k4fnabs(x) (vec_nabs(x))
#define k4exp(x) \
({ \
CCTK_REAL4_VEC const xexp=(x); \
vec4_set(exp(vec4_elt0(xexp)), exp(vec4_elt1(xexp)), \
exp(vec4_elt2(xexp)), exp(vec4_elt3(xexp))); \
})
#define k4log(x) \
({ \
CCTK_REAL4_VEC const xlog=(x); \
vec4_set(log(vec4_elt0(xlog)), log(vec4_elt1(xlog)), \
log(vec4_elt2(xlog)), log(vec4_elt3(xlog))); \
})
#define k4pow(x,a) \
({ \
CCTK_REAL4_VEC const xpow=(x); \
CCTK_REAL4 const apow=(a); \
vec4_set(pow(vec4_elt0(xpow),apow), pow(vec4_elt1(xpow),apow), \
pow(vec4_elt2(xpow),apow), pow(vec4_elt3(xpow),apow)); \
})
#define k4sqrt(x) \
({ \
CCTK_REAL4_VEC const xsqrt=(x); \
vec4_set(sqrt(vec4_elt0(xsqrt)), sqrt(vec4_elt1(xsqrt)), \
sqrt(vec4_elt2(xsqrt)), sqrt(vec4_elt3(xsqrt))); \
})
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