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 "atan2.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(atan2,function)
  33 #include "libm_synonyms.h"
  34 #include "libm_protos.h"
  35 
  36         ENTRY(atan2)
  37         movl    4(%esp),%eax            / low part of y
  38         movl    12(%esp),%ecx           / low part of x
  39         orl     %eax,%ecx
  40         jz      .maybe_0s
  41 
  42         / not both x and y are 0's
  43 1:
  44         fldl    4(%esp)                 / push y
  45         fldl    12(%esp)                / push x
  46         fpatan                          / return atan2(y,x)
  47         ret
  48 
  49 .maybe_0s:
  50         movl    8(%esp),%eax            / high part of y
  51         movl    16(%esp),%ecx           / high part of x
  52         orl     %eax,%ecx
  53         andl    $0x7fffffff,%ecx        / clear sign

  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 "atan2.s"
  30 
  31 #include "libm.h"
  32 LIBM_ANSI_PRAGMA_WEAK(atan2,function)

  33 #include "libm_protos.h"
  34 
  35         ENTRY(atan2)
  36         movl    4(%esp),%eax            / low part of y
  37         movl    12(%esp),%ecx           / low part of x
  38         orl     %eax,%ecx
  39         jz      .maybe_0s
  40 
  41         / not both x and y are 0's
  42 1:
  43         fldl    4(%esp)                 / push y
  44         fldl    12(%esp)                / push x
  45         fpatan                          / return atan2(y,x)
  46         ret
  47 
  48 .maybe_0s:
  49         movl    8(%esp),%eax            / high part of y
  50         movl    16(%esp),%ecx           / high part of x
  51         orl     %eax,%ecx
  52         andl    $0x7fffffff,%ecx        / clear sign