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Diffstat (limited to 'newlib/libm/mathfp/s_sqrt.c')
-rw-r--r--newlib/libm/mathfp/s_sqrt.c129
1 files changed, 0 insertions, 129 deletions
diff --git a/newlib/libm/mathfp/s_sqrt.c b/newlib/libm/mathfp/s_sqrt.c
deleted file mode 100644
index bafbb38b1..000000000
--- a/newlib/libm/mathfp/s_sqrt.c
+++ /dev/null
@@ -1,129 +0,0 @@
-
-/* @(#)z_sqrt.c 1.0 98/08/13 */
-/*****************************************************************
- * The following routines are coded directly from the algorithms
- * and coefficients given in "Software Manual for the Elementary
- * Functions" by William J. Cody, Jr. and William Waite, Prentice
- * Hall, 1980.
- *****************************************************************/
-
-/*
-FUNCTION
- <<sqrt>>, <<sqrtf>>---positive square root
-
-INDEX
- sqrt
-INDEX
- sqrtf
-
-ANSI_SYNOPSIS
- #include <math.h>
- double sqrt(double <[x]>);
- float sqrtf(float <[x]>);
-
-TRAD_SYNOPSIS
- #include <math.h>
- double sqrt(<[x]>);
- float sqrtf(<[x]>);
-
-DESCRIPTION
- <<sqrt>> computes the positive square root of the argument.
-
-RETURNS
- On success, the square root is returned. If <[x]> is real and
- positive, then the result is positive. If <[x]> is real and
- negative, the global value <<errno>> is set to <<EDOM>> (domain error).
-
-
-PORTABILITY
- <<sqrt>> is ANSI C. <<sqrtf>> is an extension.
-*/
-
-/******************************************************************
- * Square Root
- *
- * Input:
- * x - floating point value
- *
- * Output:
- * square-root of x
- *
- * Description:
- * This routine performs floating point square root.
- *
- * The initial approximation is computed as
- * y0 = 0.41731 + 0.59016 * f
- * where f is a fraction such that x = f * 2^exp.
- *
- * Three Newton iterations in the form of Heron's formula
- * are then performed to obtain the final value:
- * y[i] = (y[i-1] + f / y[i-1]) / 2, i = 1, 2, 3.
- *
- *****************************************************************/
-
-#include "fdlibm.h"
-#include "zmath.h"
-
-#ifndef _DOUBLE_IS_32BITS
-
-double
-_DEFUN (sqrt, (double),
- double x)
-{
- double f, y;
- int exp, i, odd;
-
- /* Check for special values. */
- switch (numtest (x))
- {
- case NAN:
- errno = EDOM;
- return (x);
- case INF:
- if (ispos (x))
- {
- errno = EDOM;
- return (z_notanum.d);
- }
- else
- {
- errno = ERANGE;
- return (z_infinity.d);
- }
- }
-
- /* Initial checks are performed here. */
- if (x == 0.0)
- return (0.0);
- if (x < 0)
- {
- errno = EDOM;
- return (z_notanum.d);
- }
-
- /* Find the exponent and mantissa for the form x = f * 2^exp. */
- f = frexp (x, &exp);
-
- odd = exp & 1;
-
- /* Get the initial approximation. */
- y = 0.41731 + 0.59016 * f;
-
- f /= 2.0;
- /* Calculate the remaining iterations. */
- for (i = 0; i < 3; ++i)
- y = y / 2.0 + f / y;
-
- /* Calculate the final value. */
- if (odd)
- {
- y *= __SQRT_HALF;
- exp++;
- }
- exp >>= 1;
- y = ldexp (y, exp);
-
- return (y);
-}
-
-#endif /* _DOUBLE_IS_32BITS */