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author | mike <mike@FreeBSD.org> | 2003-02-08 20:37:55 +0000 |
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committer | mike <mike@FreeBSD.org> | 2003-02-08 20:37:55 +0000 |
commit | b4e3f2f94a505c800e895764e429ec9ec310d9b4 (patch) | |
tree | 5fa8c1927e480809720c766a3f48569e33c80af9 /lib/libc/amd64 | |
parent | 9c57bdd382a4547a47c07bb50cb31b20e614f0c9 (diff) | |
download | FreeBSD-src-b4e3f2f94a505c800e895764e429ec9ec310d9b4.zip FreeBSD-src-b4e3f2f94a505c800e895764e429ec9ec310d9b4.tar.gz |
Implement fpclassify():
o Add a MD header private to libc called _fpmath.h; this header
contains bitfield layouts of MD floating-point types.
o Add a MI header private to libc called fpmath.h; this header
contains bitfield layouts of MI floating-point types.
o Add private libc variables to lib/libc/$arch/gen/infinity.c for
storing NaN values.
o Add __double_t and __float_t to <machine/_types.h>, and provide
double_t and float_t typedefs in <math.h>.
o Add some C99 manifest constants (FP_ILOGB0, FP_ILOGBNAN, HUGE_VALF,
HUGE_VALL, INFINITY, NAN, and return values for fpclassify()) to
<math.h> and others (FLT_EVAL_METHOD, DECIMAL_DIG) to <float.h> via
<machine/float.h>.
o Add C99 macro fpclassify() which calls __fpclassify{d,f,l}() based
on the size of its argument. __fpclassifyl() is never called on
alpha because (sizeof(long double) == sizeof(double)), which is good
since __fpclassifyl() can't deal with such a small `long double'.
This was developed by David Schultz and myself with input from bde and
fenner.
PR: 23103
Submitted by: David Schultz <dschultz@uclink.Berkeley.EDU>
(significant portions)
Reviewed by: bde, fenner (earlier versions)
Diffstat (limited to 'lib/libc/amd64')
-rw-r--r-- | lib/libc/amd64/_fpmath.h | 40 | ||||
-rw-r--r-- | lib/libc/amd64/gen/infinity.c | 3 |
2 files changed, 43 insertions, 0 deletions
diff --git a/lib/libc/amd64/_fpmath.h b/lib/libc/amd64/_fpmath.h new file mode 100644 index 0000000..d78e601 --- /dev/null +++ b/lib/libc/amd64/_fpmath.h @@ -0,0 +1,40 @@ +/*- + * Copyright (c) 2002, 2003 David Schultz <dschultz@uclink.Berkeley.EDU> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +union IEEEl2bits { + long double e; + struct { + unsigned int manl :32; + unsigned int manh :32; + unsigned int exp :15; + unsigned int sign :1; + unsigned int junk :16; + } bits; +}; + +#define mask_nbit_l(u) ((u).bits.manh &= 0x7fffffff) diff --git a/lib/libc/amd64/gen/infinity.c b/lib/libc/amd64/gen/infinity.c index 547927b..464b402 100644 --- a/lib/libc/amd64/gen/infinity.c +++ b/lib/libc/amd64/gen/infinity.c @@ -9,3 +9,6 @@ __FBSDID("$FreeBSD$"); /* bytes for +Infinity on a 387 */ const union __infinity_un __infinity = { { 0, 0, 0, 0, 0, 0, 0xf0, 0x7f } }; + +/* bytes for NaN */ +const union __nan_un __nan = { { 0, 0, 0xc0, 0xff } }; |