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| -rw-r--r-- | instantiations.cc | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/instantiations.cc b/instantiations.cc index 14854f6..345add5 100644 --- a/instantiations.cc +++ b/instantiations.cc @@ -71,3 +71,129 @@ namespace vecmathlib { #endif } + + + +// Various tests to detect auto-vectorization features + + + +#include <cstdlib> +using namespace std; + +// Vector size; this is system-specific and needs to be manually +// adapted +#define VECSIZE 4 + +using namespace vecmathlib; +typedef realvec<double,VECSIZE> doubleV; + + + +#define restrict __restrict__ + +#ifdef __clang__ +# define __builtin_assume_aligned(exp, align) (exp) +#endif + + + +// Simple, naive loop adding two arrays +extern "C" +void loop_add(double* a_, + double* b_, + double* c_, + ptrdiff_t n) +{ + doubleV* a = (doubleV*)a_; + doubleV* b = (doubleV*)b_; + doubleV* c = (doubleV*)c_; + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + a[i] = b[i] + c[i]; + } +} + + + +// Declare pointers as restrict +extern "C" +void loop_add_restrict(double *restrict a_, + double *restrict b_, + double *restrict c_, + ptrdiff_t n) +{ + doubleV *restrict a = (doubleV*)a_; + doubleV *restrict b = (doubleV*)b_; + doubleV *restrict c = (doubleV*)c_; + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + a[i] = b[i] + c[i]; + } +} + + + +// Declare pointers as restrict and aligned +extern "C" +void loop_add_aligned(double *restrict a_, + double *restrict b_, + double *restrict c_, + ptrdiff_t n) +{ + doubleV *restrict a = (doubleV*)__builtin_assume_aligned(a_, sizeof *a); + doubleV *restrict b = (doubleV*)__builtin_assume_aligned(b_, sizeof *b); + doubleV *restrict c = (doubleV*)__builtin_assume_aligned(c_, sizeof *c); + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + a[i] = b[i] + c[i]; + } +} + + + +// Reduction loop +extern "C" +double loop_dot_reduce(double *restrict a_, + double *restrict b_, + ptrdiff_t n) +{ + doubleV *restrict a = (doubleV*)__builtin_assume_aligned(a_, sizeof *a); + doubleV *restrict b = (doubleV*)__builtin_assume_aligned(b_, sizeof *b); + doubleV sumV = 0.0; + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + sumV += a[i] * b[i]; + } + return sum(sumV); +} + + + +// Loop with a simple if condition (fmax) +extern "C" +void loop_if_simple(double *restrict a_, + double *restrict b_, + double *restrict c_, + ptrdiff_t n) +{ + doubleV *restrict a = (doubleV*)__builtin_assume_aligned(a_, sizeof *a); + doubleV *restrict b = (doubleV*)__builtin_assume_aligned(b_, sizeof *b); + doubleV *restrict c = (doubleV*)__builtin_assume_aligned(c_, sizeof *c); + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + a[i] = ifthen(b[i] > c[i], b[i], c[i]); + } +} + + + +// Loop with a complex if condition (select) +extern "C" +void loop_if(double *restrict a_, + double *restrict b_, + double *restrict c_, + ptrdiff_t n) +{ + doubleV *restrict a = (doubleV*)__builtin_assume_aligned(a_, sizeof *a); + doubleV *restrict b = (doubleV*)__builtin_assume_aligned(b_, sizeof *b); + doubleV *restrict c = (doubleV*)__builtin_assume_aligned(c_, sizeof *c); + for (ptrdiff_t i=0; i<n/VECSIZE; ++i) { + a[i] = ifthen(b[i] > doubleV(0.0), b[i] * c[i], doubleV(1.0)); + } +} |
