Welcome to mirror list, hosted at ThFree Co, Russian Federation.

cygwin.com/git/newlib-cygwin.git - Unnamed repository; edit this file 'description' to name the repository.
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat (limited to 'newlib/libm/mathfp/sf_sqrt.c')
-rw-r--r--newlib/libm/mathfp/sf_sqrt.c100
1 files changed, 0 insertions, 100 deletions
diff --git a/newlib/libm/mathfp/sf_sqrt.c b/newlib/libm/mathfp/sf_sqrt.c
deleted file mode 100644
index 5d5410dce..000000000
--- a/newlib/libm/mathfp/sf_sqrt.c
+++ /dev/null
@@ -1,100 +0,0 @@
-
-/* @(#)z_sqrtf.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.
- *****************************************************************/
-/******************************************************************
- * 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"
-
-float
-_DEFUN (sqrtf, (float),
- float x)
-{
- float f, y;
- int exp, i, odd;
-
- /* Check for special values. */
- switch (numtestf (x))
- {
- case NAN:
- errno = EDOM;
- return (x);
- case INF:
- if (isposf (x))
- {
- errno = EDOM;
- return (z_notanum_f.f);
- }
- else
- {
- errno = ERANGE;
- return (z_infinity_f.f);
- }
- }
-
- /* Initial checks are performed here. */
- if (x == 0.0)
- return (0.0);
- if (x < 0)
- {
- errno = EDOM;
- return (z_notanum_f.f);
- }
-
- /* Find the exponent and mantissa for the form x = f * 2^exp. */
- f = frexpf (x, &exp);
- odd = exp & 1;
-
- /* Get the initial approximation. */
- y = 0.41731 + 0.59016 * f;
-
- f *= 0.5;
- /* Calculate the remaining iterations. */
- for (i = 0; i < 2; ++i)
- y = y * 0.5 + f / y;
-
- /* Calculate the final value. */
- if (odd)
- {
- y *= __SQRT_HALF;
- exp++;
- }
- exp >>= 1;
- y = ldexpf (y, exp);
-
- return (y);
-}
-
-#ifdef _DOUBLE_IS_32BITS
-
-double sqrt (double x)
-{
- return (double) sqrtf ((float) x);
-}
-
-#endif /* _DOUBLE_IS_32BITS */