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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
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1 files changed, 265 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/compat/generate-random.c b/gcc/testsuite/gcc.dg/compat/generate-random.c
new file mode 100644
index 000000000..c4b06db67
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/compat/generate-random.c
@@ -0,0 +1,265 @@
+/* Copyright (C) 1995, 2004 Free Software Foundation
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301 USA.  */
+
+/*
+ * This is derived from the Berkeley source:
+ *	@(#)random.c	5.5 (Berkeley) 7/6/88
+ * It was reworked for the GNU C Library by Roland McGrath.
+ * Rewritten to use reentrant functions by Ulrich Drepper, 1995.
+ */
+
+/*
+   Copyright (C) 1983 Regents of the University of California.
+   All rights reserved.
+ 
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+   2. 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.
+   4. Neither the name of the University 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 REGENTS 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 REGENTS 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.*/
+
+#include <limits.h>
+#include <stdlib.h>
+#include "generate-random.h"
+
+
+/* An improved random number generation package.  In addition to the standard
+   rand()/srand() like interface, this package also has a special state info
+   interface.  The initstate() routine is called with a seed, an array of
+   bytes, and a count of how many bytes are being passed in; this array is
+   then initialized to contain information for random number generation with
+   that much state information.  Good sizes for the amount of state
+   information are 32, 64, 128, and 256 bytes.  The state can be switched by
+   calling the setstate() function with the same array as was initialized
+   with initstate().  By default, the package runs with 128 bytes of state
+   information and generates far better random numbers than a linear
+   congruential generator.  If the amount of state information is less than
+   32 bytes, a simple linear congruential R.N.G. is used.  Internally, the
+   state information is treated as an array of longs; the zeroth element of
+   the array is the type of R.N.G. being used (small integer); the remainder
+   of the array is the state information for the R.N.G.  Thus, 32 bytes of
+   state information will give 7 longs worth of state information, which will
+   allow a degree seven polynomial.  (Note: The zeroth word of state
+   information also has some other information stored in it; see setstate
+   for details).  The random number generation technique is a linear feedback
+   shift register approach, employing trinomials (since there are fewer terms
+   to sum up that way).  In this approach, the least significant bit of all
+   the numbers in the state table will act as a linear feedback shift register,
+   and will have period 2^deg - 1 (where deg is the degree of the polynomial
+   being used, assuming that the polynomial is irreducible and primitive).
+   The higher order bits will have longer periods, since their values are
+   also influenced by pseudo-random carries out of the lower bits.  The
+   total period of the generator is approximately deg*(2**deg - 1); thus
+   doubling the amount of state information has a vast influence on the
+   period of the generator.  Note: The deg*(2**deg - 1) is an approximation
+   only good for large deg, when the period of the shift register is the
+   dominant factor.  With deg equal to seven, the period is actually much
+   longer than the 7*(2**7 - 1) predicted by this formula.  */
+
+
+
+/* For each of the currently supported random number generators, we have a
+   break value on the amount of state information (you need at least this many
+   bytes of state info to support this random number generator), a degree for
+   the polynomial (actually a trinomial) that the R.N.G. is based on, and
+   separation between the two lower order coefficients of the trinomial.  */
+
+/* Linear congruential.  */
+#define	TYPE_0		0
+#define	BREAK_0		8
+#define	DEG_0		0
+#define	SEP_0		0
+
+/* x**7 + x**3 + 1.  */
+#define	TYPE_1		1
+#define	BREAK_1		32
+#define	DEG_1		7
+#define	SEP_1		3
+
+/* x**15 + x + 1.  */
+#define	TYPE_2		2
+#define	BREAK_2		64
+#define	DEG_2		15
+#define	SEP_2		1
+
+/* x**31 + x**3 + 1.  */
+#define	TYPE_3		3
+#define	BREAK_3		128
+#define	DEG_3		31
+#define	SEP_3		3
+
+/* x**63 + x + 1.  */
+#define	TYPE_4		4
+#define	BREAK_4		256
+#define	DEG_4		63
+#define	SEP_4		1
+
+
+/* Array versions of the above information to make code run faster.
+   Relies on fact that TYPE_i == i.  */
+
+#define	MAX_TYPES	5	/* Max number of types above.  */
+
+
+/* Initially, everything is set up as if from:
+	initstate(1, randtbl, 128);
+   Note that this initialization takes advantage of the fact that srandom
+   advances the front and rear pointers 10*rand_deg times, and hence the
+   rear pointer which starts at 0 will also end up at zero; thus the zeroth
+   element of the state information, which contains info about the current
+   position of the rear pointer is just
+	(MAX_TYPES * (rptr - state)) + TYPE_3 == TYPE_3.  */
+
+static int randtbl[DEG_3 + 1] =
+  {
+    TYPE_3,
+
+    -1726662223, 379960547, 1735697613, 1040273694, 1313901226,
+    1627687941, -179304937, -2073333483, 1780058412, -1989503057,
+    -615974602, 344556628, 939512070, -1249116260, 1507946756,
+    -812545463, 154635395, 1388815473, -1926676823, 525320961,
+    -1009028674, 968117788, -123449607, 1284210865, 435012392,
+    -2017506339, -911064859, -370259173, 1132637927, 1398500161,
+    -205601318,
+  };
+
+
+static struct generate_random_data unsafe_state =
+  {
+/* FPTR and RPTR are two pointers into the state info, a front and a rear
+   pointer.  These two pointers are always rand_sep places aparts, as they
+   cycle through the state information.  (Yes, this does mean we could get
+   away with just one pointer, but the code for random is more efficient
+   this way).  The pointers are left positioned as they would be from the call:
+	initstate(1, randtbl, 128);
+   (The position of the rear pointer, rptr, is really 0 (as explained above
+   in the initialization of randtbl) because the state table pointer is set
+   to point to randtbl[1] (as explained below).)  */
+
+   &randtbl[SEP_3 + 1],  /* fptr */
+   &randtbl[1],          /* rptr */
+
+/* The following things are the pointer to the state information table,
+   the type of the current generator, the degree of the current polynomial
+   being used, and the separation between the two pointers.
+   Note that for efficiency of random, we remember the first location of
+   the state information, not the zeroth.  Hence it is valid to access
+   state[-1], which is used to store the type of the R.N.G.
+   Also, we remember the last location, since this is more efficient than
+   indexing every time to find the address of the last element to see if
+   the front and rear pointers have wrapped.  */
+
+    &randtbl[1],  /* state */
+
+    TYPE_3,  /* rand_type */
+    DEG_3,   /* rand_deg */
+    SEP_3,   /* rand_sep */
+
+    &randtbl[sizeof (randtbl) / sizeof (randtbl[0])]  /* end_ptr */
+};
+
+/* Initialize the random number generator based on the given seed.  If the
+   type is the trivial no-state-information type, just remember the seed.
+   Otherwise, initializes state[] based on the given "seed" via a linear
+   congruential generator.  Then, the pointers are set to known locations
+   that are exactly rand_sep places apart.  Lastly, it cycles the state
+   information a given number of times to get rid of any initial dependencies
+   introduced by the L.C.R.N.G.  Note that the initialization of randtbl[]
+   for default usage relies on values produced by this routine.  */
+void
+generate_srandom (unsigned int x)
+{
+  (void) generate_srandom_r (x, &unsafe_state);
+}
+
+/* Initialize the state information in the given array of N bytes for
+   future random number generation.  Based on the number of bytes we
+   are given, and the break values for the different R.N.G.'s, we choose
+   the best (largest) one we can and set things up for it.  srandom is
+   then called to initialize the state information.  Note that on return
+   from srandom, we set state[-1] to be the type multiplexed with the current
+   value of the rear pointer; this is so successive calls to initstate won't
+   lose this information and will be able to restart with setstate.
+   Note: The first thing we do is save the current state, if any, just like
+   setstate so that it doesn't matter when initstate is called.
+   Returns a pointer to the old state.  */
+char *
+generate_initstate (unsigned int seed, char *arg_state, size_t n)
+{
+  int *ostate;
+
+  ostate = &unsafe_state.state[-1];
+  generate_initstate_r (seed, arg_state, n, &unsafe_state);
+  return (char *) ostate;
+}
+
+/* Restore the state from the given state array.
+   Note: It is important that we also remember the locations of the pointers
+   in the current state information, and restore the locations of the pointers
+   from the old state information.  This is done by multiplexing the pointer
+   location into the zeroth word of the state information. Note that due
+   to the order in which things are done, it is OK to call setstate with the
+   same state as the current state
+   Returns a pointer to the old state information.  */
+char *
+generate_setstate (char *arg_state)
+{
+  int *ostate;
+
+  ostate = &unsafe_state.state[-1];
+  if (generate_setstate_r (arg_state, &unsafe_state) < 0)
+    ostate = NULL;
+  return (char *) ostate;
+}
+
+/* If we are using the trivial TYPE_0 R.N.G., just do the old linear
+   congruential bit.  Otherwise, we do our fancy trinomial stuff, which is the
+   same in all the other cases due to all the global variables that have been
+   set up.  The basic operation is to add the number at the rear pointer into
+   the one at the front pointer.  Then both pointers are advanced to the next
+   location cyclically in the table.  The value returned is the sum generated,
+   reduced to 31 bits by throwing away the "least random" low bit.
+   Note: The code takes advantage of the fact that both the front and
+   rear pointers can't wrap on the same call by not testing the rear
+   pointer if the front one has wrapped.  Returns a 31-bit random number.  */
+
+long int
+generate_random (void)
+{
+  int retval;
+  (void) generate_random_r (&unsafe_state, &retval);
+  return retval;
+}