src/sys/amd64/include/float.h, branch release/13.2.0

Copy amd64 float.h to x86 and merge with i386 float.h. Replace

2012-03-04T14:00:32Z

amd64/i386/pc98 float.h with stubs.

Add C11 macros describing subnormal numbers to float.h.

2012-01-23T06:36:41Z

Reviewed by: bde

Translate from the i386. All FP constants and operations are evaluated

2008-01-17T13:12:46Z

in the range and precision of their type(s) on amd64, but FLT_EVAL_METHOD said that they were evalated in the "interesting" (buggy) i387 methods. float_t was broken compatibly with FLT_EVAL_METHOD. These definitions seem to be broken on powerpc and possibly on arm. float_t is float on powerpc with gcc [-notraditional] according to glibc, and FLT_EVAL_METHOD is marked with XXX on arm.

Begin all license/copyright comments with /*-

2005-01-05T20:17:21Z

Make FLT_ROUNDS correctly reflect the dynamic rounding mode.

2004-07-19T08:17:25Z

MFi386: whitespace nit fix (spare blank line)

2004-07-08T01:32:25Z

Hide FLT_EVAL_METHOD and DECIMAL_DIG in pre-C99 compilation

2004-04-25T02:36:29Z

environments. PR: 63935 Submitted by: Stefan Farfeleder

Remove advertising clause from University of California Regent's license,

2004-04-05T21:29:41Z

per letter dated July 22, 1999. Approved by: core

Implement fpclassify():

2003-02-08T20:37:55Z

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 , and provide double_t and float_t typedefs in . o Add some C99 manifest constants (FP_ILOGB0, FP_ILOGBNAN, HUGE_VALF, HUGE_VALL, INFINITY, NAN, and return values for fpclassify()) to and others (FLT_EVAL_METHOD, DECIMAL_DIG) to via . 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 (significant portions) Reviewed by: bde, fenner (earlier versions)

Use the correct values for LDBL_*. Libc doesn't completely support

2002-10-25T07:02:52Z

long doubles at the moment (printf truncates them to doubles). However, long doubles to appear to work to the ranges listed in this commit on both -stable (4.5) and -current. There may be some slight rounding issues with long doubles, but that's an orthogonal issue to these constants. I've had this in my local tree for 3 months, and in my company's local tree for 15 months with no ill effects. Obtained from: NetBSD Not likely to like it: bde