10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 /*
  26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #if defined(ELFOBJ)
  31 #pragma weak ldexp = __ldexp
  32 #endif
  33 
  34 #include "libm.h"
  35 #include <errno.h>
  36 
  37 double
  38 ldexp(double x, int n) {
  39         int *px = (int *) &x, ix = px[HIWORD] & ~0x80000000;
  40 
  41         if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0)
  42 #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
  43                 return (ix >= 0x7ff80000 ? x : x + x);
  44                 /* assumes sparc-like QNaN */
  45 #else
  46                 return (x + x);
  47 #endif
  48         x = scalbn(x, n);
  49         ix = px[HIWORD] & ~0x80000000;
  50         /*
  51          * SVID3 requires both overflow and underflow cases to set errno
  52          * XPG3/XPG4/XPG4.2/SUSv2 requires overflow to set errno

  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 /*
  26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #pragma weak __ldexp = ldexp


  31 
  32 #include "libm.h"
  33 #include <errno.h>
  34 
  35 double
  36 ldexp(double x, int n) {
  37         int *px = (int *) &x, ix = px[HIWORD] & ~0x80000000;
  38 
  39         if (ix >= 0x7ff00000 || (px[LOWORD] | ix) == 0)
  40 #if defined(FPADD_TRAPS_INCOMPLETE_ON_NAN)
  41                 return (ix >= 0x7ff80000 ? x : x + x);
  42                 /* assumes sparc-like QNaN */
  43 #else
  44                 return (x + x);
  45 #endif
  46         x = scalbn(x, n);
  47         ix = px[HIWORD] & ~0x80000000;
  48         /*
  49          * SVID3 requires both overflow and underflow cases to set errno
  50          * XPG3/XPG4/XPG4.2/SUSv2 requires overflow to set errno