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timings for pidigits
TBR=rsc OCL=32857 CL=32857
This commit is contained in:
Rob Pike
parent
081bc69cde
commit
2f9c48f6d1
123
test/bench/pidigits.c
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123
test/bench/pidigits.c
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@ -0,0 +1,123 @@
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of "The Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The Computer Language Benchmarks Game
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http://shootout.alioth.debian.org/
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contributed by Paolo Bonzini & Sean Bartlett
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modified by Michael Mellor
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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static mpz_t numer, accum, denom, tmp1, tmp2;
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static int extract_digit()
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{
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if (mpz_cmp(numer, accum) > 0)
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return -1;
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/* Compute (numer * 3 + accum) / denom */
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mpz_mul_2exp(tmp1, numer, 1);
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mpz_add(tmp1, tmp1, numer);
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mpz_add(tmp1, tmp1, accum);
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mpz_fdiv_qr(tmp1, tmp2, tmp1, denom);
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/* Now, if (numer * 4 + accum) % denom... */
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mpz_add(tmp2, tmp2, numer);
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/* ... is normalized, then the two divisions have the same result. */
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if (mpz_cmp(tmp2, denom) >= 0)
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return -1;
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return mpz_get_ui(tmp1);
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}
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static void next_term(unsigned int k)
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{
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unsigned int y2 = k*2 + 1;
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mpz_mul_2exp(tmp1, numer, 1);
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mpz_add(accum, accum, tmp1);
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mpz_mul_ui(accum, accum, y2);
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mpz_mul_ui(numer, numer, k);
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mpz_mul_ui(denom, denom, y2);
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}
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static void eliminate_digit(unsigned int d)
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{
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mpz_submul_ui(accum, denom, d);
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mpz_mul_ui(accum, accum, 10);
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mpz_mul_ui(numer, numer, 10);
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}
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static void pidigits(unsigned int n)
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{
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int d;
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unsigned int i = 0, k = 0, m;
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mpz_init(tmp1);
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mpz_init(tmp2);
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mpz_init_set_ui(numer, 1);
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mpz_init_set_ui(accum, 0);
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mpz_init_set_ui(denom, 1);
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for(;;)
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{
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do {
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k++;
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next_term(k);
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d = extract_digit();
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} while(d == -1);
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putchar(d + '0');
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i++;
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m = i%10;
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if(m == 0)
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printf("\t:%d\n", i);
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if(i >= n)
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break;
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eliminate_digit(d);
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}
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if(m) {
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m = 10 - m;
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while(m--)
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putchar(' ');
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printf("\t:%d\n", n);
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}
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}
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int main(int argc, char **argv)
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{
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pidigits(argc > 1 ? atoi(argv[1]) : 27);
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return 0;
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}
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3
test/bench/pidigits.txt
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3
test/bench/pidigits.txt
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3141592653 :10
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5897932384 :20
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6264338 :27
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@ -71,9 +71,9 @@ August 6, 2009
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k-nucleotide 5000000
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gcc -O2 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include k-nucleotide.c -lglib-2.0 k-nucleotide.c: 10.72u 0.01s 10.74r
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gccgo -O2 k-nucleotide.go 22.69u 0.85s 24.09r
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gc k-nucleotide 15.63u 0.26s 16.41r
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gc_B k-nucleotide 17.22u 0.04s 17.28r
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gccgo -O2 k-nucleotide.go 21.64u 0.83s 22.78r
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gc k-nucleotide 16.08u 0.06s 16.50r
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gc_B k-nucleotide 17.32u 0.02s 17.37r
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mandelbrot 5500
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gcc -O2 mandelbrot.c 56.13u 0.02s 56.17r
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@ -86,3 +86,9 @@ meteor 16000
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gccgo -O2 meteor-contest.go 0.12u 0.00s 0.14r
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gc meteor-contest 0.24u 0.00s 0.26r
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gc_B meteor-contest 0.23u 0.00s 0.24r
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pidigits 10000
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gcc -O2 pidigits.c -lgmp 2.60u 0.00s 2.62r
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gc pidigits 77.69u 0.14s 78.18r
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gc_B pidigits 74.26u 0.18s 75.41r
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gc_B pidigits 68.48u 0.20s 69.31r # special case: no bounds checking in bignum
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@ -111,9 +111,17 @@ meteor() {
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run 'gc_B meteor-contest' $O.out
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}
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pidigits() {
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echo 'pidigits 10000'
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run 'gcc -O2 pidigits.c -lgmp' a.out 10000
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# run 'gccgo -O2 pidigits.go' a.out -n 10000 # uncomment when gccgo library updated
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run 'gc pidigits' $O.out -n 10000
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run 'gc_B pidigits' $O.out -n 10000
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}
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case $# in
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0)
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run="fasta revcom nbody binarytree fannkuch regexdna spectralnorm knucleotide mandelbrot meteor"
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run="fasta revcom nbody binarytree fannkuch regexdna spectralnorm knucleotide mandelbrot meteor pidigits"
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;;
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*)
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run=$*
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