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| author | Ulrich Drepper <drepper@redhat.com> | 1998-07-29 12:34:57 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 1998-07-29 12:34:57 +0000 |
| commit | ec986e237a6c0fe52f172c254d3da2ef57b85eb2 (patch) | |
| tree | b938227b19ad155bf8c5b5a9960b0ebba90c80a5 /sysdeps/libm-ieee754/s_csqrtf.c | |
| parent | ceeeaa3dcf76e7bc68ad276a1a54d988bef58934 (diff) | |
| download | glibc-ec986e237a6c0fe52f172c254d3da2ef57b85eb2.tar.gz glibc-ec986e237a6c0fe52f172c254d3da2ef57b85eb2.tar.xz glibc-ec986e237a6c0fe52f172c254d3da2ef57b85eb2.zip | |
Update.
1998-07-29 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/pattern.texi (More Flags for Globbing): Fix typo. * manual/math.texi (Special Functions): Fix typo. * sysdeps/unix/sysv/linux/bits/in.h (IPV6_ROUTER_ALERT): New constant from Linux 2.1.112. * posix/Makefile (install-lib): Compile libposix.a only if build-static == yes. 1998-07-28 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/glob.c: Maintain const correctness. Move extern declarations to file level. Cope with unsupported _SC_GETPW_R_SIZE_MAX. 1998-07-29 Ulrich Drepper <drepper@cygnus.com> * stdio-common/tst-printf.c: %z is now recognized by printf. * sysdeps/libm-ieee754/c_csqrt.c: Fix problems with some cancelation errors. * sysdeps/libm-ieee754/c_csqrtf.c: Likewise. * sysdeps/libm-ieee754/c_csqrtlc: Likewise. Patch by Stephen L Moshier <moshier@mediaone.net>. * math/libm-test.c (csqrt_test): Correct typo in one test, add another one. * sysdeps/unix/sysv/linux/bits/siginfo.h: Adjust siginfo_t after latest kernel change.
Diffstat (limited to 'sysdeps/libm-ieee754/s_csqrtf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_csqrtf.c | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/sysdeps/libm-ieee754/s_csqrtf.c b/sysdeps/libm-ieee754/s_csqrtf.c index 5fdf2c1d66..015b0cd57f 100644 --- a/sysdeps/libm-ieee754/s_csqrtf.c +++ b/sysdeps/libm-ieee754/s_csqrtf.c @@ -1,5 +1,5 @@ /* Complex square root of float value. - Copyright (C) 1997 Free Software Foundation, Inc. + Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Based on an algorithm by Stephen L. Moshier <moshier@world.std.com>. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -84,22 +84,25 @@ __csqrtf (__complex__ float x) } else { -#if 0 /* FIXME: this is broken. */ - __complex__ float q; - float t, r; +#if 0 + float d, r, s; - if (fabsf (__imag__ x) < 2.0e-4 * fabsf (__real__ x)) - t = 0.25 * __imag__ x * (__imag__ x / __real__ x); + d = __ieee754_hypotf (__real__ x, __imag__ x); + /* Use the identity 2 Re res Im res = Im x + to avoid cancellation error in d +/- Re x. */ + if (__real__ x > 0) + { + r = __ieee754_sqrtf (0.5f * d + 0.5f * __real__ x); + s = (0.5f * __imag__ x) / r; + } else - t = 0.5 * (__ieee754_hypotf (__real__ x, __imag__ x) - __real__ x); - - r = __ieee754_sqrtf (t); - - __real__ q = __imag__ x / (2.0 * r); - __imag__ q = r; + { + s = __ieee754_sqrtf (0.5f * d - 0.5f * __real__ x); + r = (0.5f * __imag__ x) / s; + } - /* Heron iteration in complex arithmetic. */ - res = 0.5 * (q + q / x); + __real__ res = r; + __imag__ res = __copysignf (s, __imag__ x); #else float d, imag; |