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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29         .file "exp.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(exp,function)
  33 #include "libm_synonyms.h"
  34 #include "libm_protos.h"
  35 
  36         ENTRY(exp)
  37         movl    8(%esp),%ecx            / ecx <-- hi_32(x)
  38         andl    $0x7fffffff,%ecx        / ecx <-- hi_32(|x|)
  39         cmpl    $0x3fe62e42,%ecx        / Is |x| < ln(2)?
  40         jb      .shortcut               / If so, take a shortcut.
  41         je      .check_tail             / |x| may be only slightly < ln(2)
  42         cmpl    $0x7ff00000,%ecx        / hi_32(|x|) >= hi_32(INF)?
  43         jae     .not_finite             / if so, x is not finite
  44 .finite_non_special:                    / Here, ln(2) < |x| < INF
  45         fldl    4(%esp)                 / push x
  46         subl    $8,%esp
  47                                         /// overhead of RP save/restore; 63/15
  48         fstcw   (%esp)                  /// ; 15/3
  49         movw    (%esp),%ax              /// ; 4/1
  50         movw    %ax,4(%esp)             /// save old RP; 2/1
  51         orw     $0x0300,%ax             /// force 64-bit RP; 2/1
  52         movw    %ax,(%esp)              /// ; 2/1
  53         fldcw   (%esp)                  /// ; 19/4

  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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29         .file "exp.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(exp,function)

  33 #include "libm_protos.h"
  34 
  35         ENTRY(exp)
  36         movl    8(%esp),%ecx            / ecx <-- hi_32(x)
  37         andl    $0x7fffffff,%ecx        / ecx <-- hi_32(|x|)
  38         cmpl    $0x3fe62e42,%ecx        / Is |x| < ln(2)?
  39         jb      .shortcut               / If so, take a shortcut.
  40         je      .check_tail             / |x| may be only slightly < ln(2)
  41         cmpl    $0x7ff00000,%ecx        / hi_32(|x|) >= hi_32(INF)?
  42         jae     .not_finite             / if so, x is not finite
  43 .finite_non_special:                    / Here, ln(2) < |x| < INF
  44         fldl    4(%esp)                 / push x
  45         subl    $8,%esp
  46                                         /// overhead of RP save/restore; 63/15
  47         fstcw   (%esp)                  /// ; 15/3
  48         movw    (%esp),%ax              /// ; 4/1
  49         movw    %ax,4(%esp)             /// save old RP; 2/1
  50         orw     $0x0300,%ax             /// force 64-bit RP; 2/1
  51         movw    %ax,(%esp)              /// ; 2/1
  52         fldcw   (%esp)                  /// ; 19/4