share/lapack/blas/drotg.lisp

   1 ;;; Compiled by f2cl version:
   2 ;;; ("f2cl1.l,v 2edcbd958861 2012/05/30 03:34:52 toy $"
   3 ;;;  "f2cl2.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   4 ;;;  "f2cl3.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   5 ;;;  "f2cl4.l,v 96616d88fb7e 2008/02/22 22:19:34 rtoy $"
   6 ;;;  "f2cl5.l,v 3fe93de3be82 2012/05/06 02:17:14 toy $"
   7 ;;;  "f2cl6.l,v 1d5cbacbb977 2008/08/24 00:56:27 rtoy $"
   8 ;;;  "macros.l,v 3fe93de3be82 2012/05/06 02:17:14 toy $")
   9
  10 ;;; Using Lisp CMU Common Lisp 20d (20D Unicode)
  11 ;;;
  12 ;;; Options: ((:prune-labels nil) (:auto-save t) (:relaxed-array-decls t)
  13 ;;;           (:coerce-assigns :as-needed) (:array-type ':array)
  14 ;;;           (:array-slicing t) (:declare-common nil)
  15 ;;;           (:float-format double-float))
  16
  17 (in-package :blas)
  18
  19
  20 (defun drotg (da db c s)
  21   (declare (type (double-float) s c db da))
  22   (prog ((roe 0.0) (scale 0.0) (r 0.0) (z 0.0))
  23     (declare (type (double-float) z r scale roe))
  24     (setf roe db)
  25     (if (> (f2cl-lib:dabs da) (f2cl-lib:dabs db)) (setf roe da))
  26     (setf scale (+ (f2cl-lib:dabs da) (f2cl-lib:dabs db)))
  27     (if (/= scale 0.0) (go label10))
  28     (setf c 1.0)
  29     (setf s 0.0)
  30     (setf r 0.0)
  31     (setf z 0.0)
  32     (go label20)
  33    label10
  34     (setf r
  35             (* scale
  36                (f2cl-lib:dsqrt
  37                 (+ (expt (/ da scale) 2) (expt (/ db scale) 2)))))
  38     (setf r (* (f2cl-lib:dsign 1.0 roe) r))
  39     (setf c (/ da r))
  40     (setf s (/ db r))
  41     (setf z 1.0)
  42     (if (> (f2cl-lib:dabs da) (f2cl-lib:dabs db)) (setf z s))
  43     (if (and (>= (f2cl-lib:dabs db) (f2cl-lib:dabs da)) (/= c 0.0))
  44         (setf z (/ 1.0 c)))
  45    label20
  46     (setf da r)
  47     (setf db z)
  48     (go end_label)
  49    end_label
  50     (return (values da db c s))))
  51
  52 (in-package #-gcl #:cl-user #+gcl "CL-USER")
  53 #+#.(cl:if (cl:find-package '#:f2cl) '(and) '(or))
  54 (eval-when (:load-toplevel :compile-toplevel :execute)
  55   (setf (gethash 'fortran-to-lisp::drotg fortran-to-lisp::*f2cl-function-info*)
  56           (fortran-to-lisp::make-f2cl-finfo
  57            :arg-types '((double-float) (double-float) (double-float)
  58                         (double-float))
  59            :return-values '(fortran-to-lisp::da fortran-to-lisp::db
  60                             fortran-to-lisp::c fortran-to-lisp::s)
  61            :calls 'nil)))
  62