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90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: expandtab:ts=8:sw=4:softtabstop=4:
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#ident "$Id$"
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#ident "Copyright (c) 2011 Tokutek Inc. All rights reserved."
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <sys/types.h>
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u_int64_t x1764_simple (const u_int64_t *buf, size_t len)
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{
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u_int64_t sum=0;
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for (size_t i=0; i<len ;i++) {
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sum = sum*17 + buf[i];
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}
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return sum;
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}
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u_int64_t x1764_2x (const u_int64_t *buf, size_t len)
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{
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assert(len%2==0);
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u_int64_t suma=0, sumb=0;
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for (size_t i=0; i<len ;i+=2) {
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suma = suma*(17L*17L) + buf[i];
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sumb = sumb*(17L*17L) + buf[i+1];
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}
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return suma*17+sumb;
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}
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u_int64_t x1764_3x (const u_int64_t *buf, size_t len)
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{
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assert(len%3==0);
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u_int64_t suma=0, sumb=0, sumc=0;
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for (size_t i=0; i<len ;i+=3) {
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suma = suma*(17LL*17LL*17LL) + buf[i];
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sumb = sumb*(17LL*17LL*17LL) + buf[i+1];
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sumc = sumc*(17LL*17LL*17LL) + buf[i+2];
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}
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u_int64_t r = suma*17L*17L + sumb*17L + sumc;
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return r;
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}
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u_int64_t x1764_4x (const u_int64_t *buf, size_t len)
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{
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assert(len%4==0);
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u_int64_t suma=0, sumb=0, sumc=0, sumd=0;
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for (size_t i=0; i<len ;i+=4) {
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suma = suma*(17LL*17LL*17LL*17LL) + buf[i];
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sumb = sumb*(17LL*17LL*17LL*17LL) + buf[i+1];
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sumc = sumc*(17LL*17LL*17LL*17LL) + buf[i+2];
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sumd = sumd*(17LL*17LL*17LL*17LL) + buf[i+3];
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}
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return suma*17L*17L*17L + sumb*17L*17L + sumc*17L + sumd;
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}
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float tdiff (struct timeval *start, struct timeval *end) {
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return (end->tv_sec-start->tv_sec) +1e-6*(end->tv_usec - start->tv_usec);
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}
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int main (int argc, char *argv[]) {
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int size = 1024*1024*4 + 8*4;
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char *data = malloc(size);
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for (int j=0; j<4; j++) {
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struct timeval start,end,end2,end3,end4;
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for (int i=0; i<size; i++) data[i]=i*i+j;
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gettimeofday(&start, 0);
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u_int64_t s = x1764_simple((u_int64_t*)data, size/sizeof(u_int64_t));
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gettimeofday(&end, 0);
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u_int64_t s2 = x1764_2x((u_int64_t*)data, size/sizeof(u_int64_t));
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gettimeofday(&end2, 0);
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u_int64_t s3 = x1764_3x((u_int64_t*)data, size/sizeof(u_int64_t));
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gettimeofday(&end3, 0);
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u_int64_t s4 = x1764_4x((u_int64_t*)data, size/sizeof(u_int64_t));
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gettimeofday(&end4, 0);
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assert(s==s2);
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assert(s==s3);
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assert(s==s4);
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double b1 = tdiff(&start, &end);
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double b2 = tdiff(&end, &end2);
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double b3 = tdiff(&end2, &end3);
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double b4 = tdiff(&end3, &end4);
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printf("s=%016llx t=%.6fs %.6fs (%4.2fx), %.6fs (%4.2fx), %.6fs (%4.2fx) [%5.2f MB/s]\n",
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(unsigned long long)s,
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b1, b2, b1/b2, b3, b1/b3, b4, b1/b4, (size/b4)/(1024*1024));
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}
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return 0;
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}
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