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authorUlrich Drepper <drepper@redhat.com>2001-01-21 16:54:08 +0000
committerUlrich Drepper <drepper@redhat.com>2001-01-21 16:54:08 +0000
commitd17c01f9fe958d9d78739d3bf7111f2c01690d0d (patch)
tree1d61abad5c2c8666a4e3a45e93ee2367c43c2c60 /stdlib/drand48-iter.c
parent27cb6b28b9cf3f133f17c245dc177a148eedca04 (diff)
Update.
* stdlib/stdlib.h (drand48_data): Make available only for __USE_MISC. Rename elements to protect namespace. Change type and position of a and init element. * stdlib/drand48-iter.c: Don't handle unsigned short > 16 bit differently. Adjust for drand48_data change. Don't compute a here, it comes from drand48_data. * stdlib/lcong48_r.c: Don't handle unsigned short > 16 bit differently. Adjust for drand48_data change. Compute a here. * stdlib/srand48_r.c: Likewise. * stdlib/drand48.c: Adjust for drand48_data change. * stdlib/lrand48.c: Likewise. * stdlib/mrand48.c: Likewise. * stdlib/seek48.c: Likewise. * stdlib/drand48_r.c: Likewise. * stdlib/lrand48_r.c: Likewise. * stdlib/mrand48_r.c: Likewise. * stdlib/seed48_r.c: Likewise. Don't handle unsigned short > 16 bit differently. * stdlib/erand48_r.c: Don't handle unsigned short > 16 bit differently. * stdlib/jrand48_r.c: Likewise.
Diffstat (limited to 'stdlib/drand48-iter.c')
-rw-r--r--stdlib/drand48-iter.c47
1 files changed, 13 insertions, 34 deletions
diff --git a/stdlib/drand48-iter.c b/stdlib/drand48-iter.c
index 707be8e566..3e8ea0e9c6 100644
--- a/stdlib/drand48-iter.c
+++ b/stdlib/drand48-iter.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995, 1996, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
@@ -20,6 +20,7 @@
#include <errno.h>
#include <stdlib.h>
#include <limits.h>
+#include <stdint.h>
#include <sys/types.h>
/* Global state for non-reentrant functions. */
@@ -31,50 +32,28 @@ __drand48_iterate (xsubi, buffer)
unsigned short int xsubi[3];
struct drand48_data *buffer;
{
- u_int64_t X, a, result;
+ uint64_t X;
+ uint64_t result;
/* Initialize buffer, if not yet done. */
- if (!buffer->init)
+ if (__builtin_expect (!buffer->__init, 0))
{
-#if (USHRT_MAX == 0xffffU)
- buffer->a[2] = 0x5;
- buffer->a[1] = 0xdeec;
- buffer->a[0] = 0xe66d;
-#else
- buffer->a[2] = 0x5deecUL;
- buffer->a[1] = 0xe66d0000UL;
- buffer->a[0] = 0;
-#endif
- buffer->c = 0xb;
- buffer->init = 1;
+ buffer->__a = 0x5deece66dull;
+ buffer->__c = 0xb;
+ buffer->__init = 1;
}
/* Do the real work. We choose a data type which contains at least
48 bits. Because we compute the modulus it does not care how
many bits really are computed. */
- if (sizeof (unsigned short int) == 2)
- {
- X = (u_int64_t)xsubi[2] << 32 | (u_int64_t)xsubi[1] << 16 | xsubi[0];
- a = ((u_int64_t)buffer->a[2] << 32 | (u_int64_t)buffer->a[1] << 16
- | buffer->a[0]);
-
- result = X * a + buffer->c;
-
- xsubi[0] = result & 0xffff;
- xsubi[1] = (result >> 16) & 0xffff;
- xsubi[2] = (result >> 32) & 0xffff;
- }
- else
- {
- X = (u_int64_t)xsubi[2] << 16 | xsubi[1] >> 16;
- a = (u_int64_t)buffer->a[2] << 16 | buffer->a[1] >> 16;
+ X = (uint64_t) xsubi[2] << 32 | (uint32_t) xsubi[1] << 16 | xsubi[0];
- result = X * a + buffer->c;
+ result = X * buffer->__a + buffer->__c;
- xsubi[0] = result >> 16 & 0xffffffffl;
- xsubi[1] = result << 16 & 0xffff0000l;
- }
+ xsubi[0] = result & 0xffff;
+ xsubi[1] = (result >> 16) & 0xffff;
+ xsubi[2] = (result >> 32) & 0xffff;
return 0;
}