From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 gcc/testsuite/go.test/test/bench/pidigits.c | 123 ++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 gcc/testsuite/go.test/test/bench/pidigits.c

(limited to 'gcc/testsuite/go.test/test/bench/pidigits.c')

diff --git a/gcc/testsuite/go.test/test/bench/pidigits.c b/gcc/testsuite/go.test/test/bench/pidigits.c
new file mode 100644
index 000000000..c064da0dd
--- /dev/null
+++ b/gcc/testsuite/go.test/test/bench/pidigits.c
@@ -0,0 +1,123 @@
+/*
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+    * Neither the name of "The Computer Language Benchmarks Game" nor the
+    name of "The Computer Language Shootout Benchmarks" nor the names of
+    its contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* The Computer Language Benchmarks Game
+  http://shootout.alioth.debian.org/
+
+  contributed by Paolo Bonzini & Sean Bartlett
+  modified by Michael Mellor
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <gmp.h>
+
+static mpz_t numer, accum, denom, tmp1, tmp2;
+
+static int extract_digit()
+{
+  if (mpz_cmp(numer, accum) > 0)
+    return -1;
+
+  /* Compute (numer * 3 + accum) / denom */
+  mpz_mul_2exp(tmp1, numer, 1);
+  mpz_add(tmp1, tmp1, numer);
+  mpz_add(tmp1, tmp1, accum);
+  mpz_fdiv_qr(tmp1, tmp2, tmp1, denom);
+
+  /* Now, if (numer * 4 + accum) % denom... */
+  mpz_add(tmp2, tmp2, numer);
+
+  /* ... is normalized, then the two divisions have the same result.  */
+  if (mpz_cmp(tmp2, denom) >= 0)
+    return -1;
+
+  return mpz_get_ui(tmp1);
+}
+
+static void next_term(unsigned int k)
+{
+  unsigned int y2 = k*2 + 1;
+
+  mpz_mul_2exp(tmp1, numer, 1);
+  mpz_add(accum, accum, tmp1);
+  mpz_mul_ui(accum, accum, y2);
+  mpz_mul_ui(numer, numer, k);
+  mpz_mul_ui(denom, denom, y2);
+}
+
+static void eliminate_digit(unsigned int d)
+{
+  mpz_submul_ui(accum, denom, d);
+  mpz_mul_ui(accum, accum, 10);
+  mpz_mul_ui(numer, numer, 10);
+}
+
+static void pidigits(unsigned int n)
+{
+  int d;
+  unsigned int i = 0, k = 0, m;
+  mpz_init(tmp1);
+  mpz_init(tmp2);
+  mpz_init_set_ui(numer, 1);
+  mpz_init_set_ui(accum, 0);
+  mpz_init_set_ui(denom, 1);
+
+  for(;;)
+  {
+    do {
+      k++;
+      next_term(k);
+      d = extract_digit();
+    } while(d == -1);
+
+    putchar(d + '0');
+
+    i++;
+    m = i%10;
+    if(m == 0)
+      printf("\t:%d\n", i);
+    if(i >= n)
+      break;
+    eliminate_digit(d);
+  }
+
+  if(m) {
+    m = 10 - m;
+    while(m--)
+      putchar(' ');
+    printf("\t:%d\n", n);
+  }
+}
+
+int main(int argc, char **argv)
+{
+  pidigits(argc > 1 ? atoi(argv[1]) : 27);
+  return 0;
+}
-- 
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