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[BZ #1466]

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* sysdeps/generic/s_csqrt.c (__csqrt): For zero real part, return
	principal square root.
	* sysdeps/generic/s_csqrtf.c (__csqrtf): Likewise.
	* sysdeps/generic/s_csqrtl.c (__csqrtl): Likewise.
	* math/libm-test.inc (csqrt_test): Add test for returning
	principal value.
This commit is contained in:
Ulrich Drepper 2005-10-13 19:08:37 +00:00
parent 1676aaeffd
commit 72c7a71de4
5 changed files with 22 additions and 10 deletions
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8
ChangeLog
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@ -1,5 +1,13 @@
2005-10-13 Ulrich Drepper <drepper@redhat.com>
[BZ #1466]
* sysdeps/generic/s_csqrt.c (__csqrt): For zero real part, return
principal square root.
* sysdeps/generic/s_csqrtf.c (__csqrtf): Likewise.
* sysdeps/generic/s_csqrtl.c (__csqrtl): Likewise.
* math/libm-test.inc (csqrt_test): Add test for returning
principal value.
* include/features.h: Define _POSIX_C_SOURCE to 200112 for
_XOPEN_SOURCE == 600.

6
math/libm-test.inc
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@ -1,4 +1,4 @@
/* Copyright (C) 1997-2002, 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 1997-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 1997.
@ -153,6 +153,7 @@
#define M_PI2_LOG10El M_PI_2l * M_LOG10El
#define M_PI4_LOG10El M_PI_4l * M_LOG10El
#define M_PI_LOG10El M_PIl * M_LOG10El
#define M_SQRT_2_2 0.70710678118654752440084436210484903L /* sqrt (2) / 2 */
static FILE *ulps_file; /* File to document difference. */
static int output_ulps; /* Should ulps printed? */
@ -2212,6 +2213,9 @@ csqrt_test (void)
TEST_c_c (csqrt, 0.75L, 1.25L, 1.05065169626078392338656675760808326L, 0.594868882070379067881984030639932657L);
TEST_c_c (csqrt, -2, -3, 0.89597747612983812471573375529004348L, -1.6741492280355400404480393008490519L);
TEST_c_c (csqrt, -2, 3, 0.89597747612983812471573375529004348L, 1.6741492280355400404480393008490519L);
/* Principal square root should be returned (i.e., non-negative real
part). */
TEST_c_c (csqrt, 0, -1, M_SQRT_2_2, -M_SQRT_2_2);
END (csqrt, complex);
}

6
sysdeps/generic/s_csqrt.c
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@ -1,5 +1,5 @@
/* Complex square root of double value.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 2005 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.
@ -79,8 +79,8 @@ __csqrt (__complex__ double x)
{
double r = __ieee754_sqrt (0.5 * fabs (__imag__ x));
__real__ res = __copysign (r, __imag__ x);
__imag__ res = r;
__real__ res = r;
__imag__ res = __copysign (r, __imag__ x);
}
else
{

6
sysdeps/generic/s_csqrtf.c
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@ -1,5 +1,5 @@
/* Complex square root of float value.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 2005 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.
@ -79,8 +79,8 @@ __csqrtf (__complex__ float x)
{
float r = __ieee754_sqrtf (0.5 * fabsf (__imag__ x));
__real__ res = __copysignf (r, __imag__ x);
__imag__ res = r;
__real__ res = r;
__imag__ res = __copysignf (r, __imag__ x);
}
else
{

6
sysdeps/generic/s_csqrtl.c
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@ -1,5 +1,5 @@
/* Complex square root of long double value.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1997, 1998, 2005 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.
@ -79,8 +79,8 @@ __csqrtl (__complex__ long double x)
{
long double r = __ieee754_sqrtl (0.5 * fabsl (__imag__ x));
__real__ res = __copysignl (r, __imag__ x);
__imag__ res = r;
__real__ res = r;
__imag__ res = __copysignl (r, __imag__ x);
}
else
{