792e51b721
This patch adds the long double functions missing in newlib to Cygwin.
Apart from some self-written additions (exp10l, finite{f,l}, isinf{f,l},
isnan{f,l}, pow10l) the files are taken from the Mingw-w64 math lib.
Minor changes were required, e.g. substitue _WIN64 with __x86_64__ and
fixing __FLT_RPT_DOMAIN/__FLT_RPT_ERANGE for Cygwin.
Cygwin:
* math: New subdir with math functions.
* Makefile.in (VPATH): Add math subdir.
(MATH_OFILES): List of object files collected from building files in
math subdir.
(DLL_OFILES): Add $(MATH_OFILES).
${CURDIR}/libm.a: Add $(MATH_OFILES) to build.
* common.din: Add new functions from math subdir.
* i686.din: Align to new math subdir. Remove functions now commonly
available.
* x86_64.din: Ditto.
* math.h: math.h wrapper to define mingw structs used in some files in
math subdir.
* include/cygwin/version.h: Bump API minor version.
newlib:
* libc/include/complex.h: Add prototypes for complex long double
functions. Only define for Cygwin.
* libc/include/math.h: Additionally enable prototypes of long double
functions for Cygwin. Add Cygwin-only prototypes for dreml, sincosl,
exp10l and pow10l. Explain why we don't add them to newlib.
* libc/include/tgmath.h: Enable long double handling on Cygwin.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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/*
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nextafterl.c
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Contributed by Danny Smith <dannysmith@users.sourceforge.net>
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No copyright claimed, absolutely no warranties.
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2005-05-09
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*/
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#include <math.h>
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long double
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nextafterl (long double x, long double y)
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{
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union {
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long double ld;
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struct {
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/* packed attribute is unnecessary on x86/x64 for these three variables */
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unsigned long long mantissa;
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unsigned short expn;
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unsigned short pad;
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} parts;
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} u;
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/* The normal bit is explicit for long doubles, unlike
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float and double. */
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static const unsigned long long normal_bit = 0x8000000000000000ull;
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u.ld = 0.0L;
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if (isnan (y) || isnan (x))
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return x + y;
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if (x == y )
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/* nextafter (0.0, -O.0) should return -0.0. */
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return y;
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u.ld = x;
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if (x == 0.0L)
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{
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u.parts.mantissa = 1ull;
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return y > 0.0L ? u.ld : -u.ld;
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}
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if (((x > 0.0L) ^ (y > x)) == 0)
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{
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u.parts.mantissa++;
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if ((u.parts.mantissa & ~normal_bit) == 0ull)
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u.parts.expn++;
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}
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else
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{
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if ((u.parts.mantissa & ~normal_bit) == 0ull)
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u.parts.expn--;
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u.parts.mantissa--;
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}
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/* If we have updated the expn of a normal number,
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or moved from denormal to normal, [re]set the normal bit. */
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if (u.parts.expn & 0x7fff)
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u.parts.mantissa |= normal_bit;
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return u.ld;
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}
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/* nexttowardl is the same function with a different name. */
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long double
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nexttowardl (long double, long double) __attribute__ ((alias("nextafterl")));
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