Sherman-Morrison/independent_test_harness/test.c.older

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#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
static __inline__ uint64_t rdtsc(void) {
unsigned hi, lo;
__asm__ __volatile__("rdtsc" : "=a"(lo), "=d"(hi));
return ((unsigned long long)lo) | (((unsigned long long)hi) << 32);
}
int qmckl_sherman_morrison(
const uint64_t LDS, const uint64_t Dim, const uint64_t N_updates,
const double *__restrict __attribute__((aligned(8))) Updates,
const uint64_t *__restrict Updates_index, const double breakdown,
double *__restrict __attribute__((aligned(8))) Slater_inv,
double *__restrict determinant);
int detupd(const uint64_t LDS, const uint64_t Dim, const uint64_t N_updates,
const double *__restrict __attribute__((aligned(8))) Updates,
const uint64_t *__restrict Updates_index, const double breakdown,
double *__restrict __attribute__((aligned(8))) Slater_inv,
double *__restrict determinant);
#define REPETITIONS 100000000
int main(int argc, char **argv) {
assert(argc == 2);
char *version = argv[1];
const uint64_t Dim = 21;
const uint64_t LDS = 24;
const uint64_t N_updates = 1;
double Updates[LDS] __attribute__((aligned(8)));
uint64_t Updates_index[N_updates];
Updates_index[0] = 1;
const double breakdown = 1e-3;
double Slater_inv[LDS * Dim] __attribute__((aligned(8)));
double determinant = 1.0;
for (int i = 0; i < Dim; i++) {
Updates[i] = i;
for (int j = 0; j < Dim; j++) {
Slater_inv[LDS * i + j] = j;
}
}
uint64_t before = rdtsc();
if (version[0] == 'c') {
for (int i = 0; i < REPETITIONS; i++) {
detupd(LDS, Dim, N_updates, Updates, Updates_index, breakdown, Slater_inv,
&determinant);
}
} else {
for (int i = 0; i < REPETITIONS; i++) {
qmckl_sherman_morrison(LDS, Dim, N_updates, Updates, Updates_index,
breakdown, Slater_inv, &determinant);
}
}
uint64_t after = rdtsc();
printf("cycles = %f\n", ((double)(after - before) / (double)REPETITIONS));
}