Commit Graph

27 Commits

Author SHA1 Message Date
das
e7c98f4fd1 Unbreak the build for arm and powerpc.
Pointy hat to yours truly.
2008-04-12 14:53:52 +00:00
das
244a0bcf48 Make several changes to the way printf handles hex floating point (%a):
1. Previously, printing the number 1.0 could produce 0x1p+0, 0x2p-1,
   0x4p-2, or 0x8p-3, depending on what happened to be convenient. This
   meant that printing a value as a double and printing the same value
   as a long double could produce different (but equivalent) results.
   The change is to always make the leading digit a 1, unless the
   number is 0. This solves the aforementioned problem and has
   several other advantages.

2. Use the FPU to do rounding. This is far simpler and more portable
   than manipulating the bits, and it fixes an obsure round-to-even
   bug. It also raises the exceptions now required by IEEE 754R.
   The drawbacks are that it is usually slightly slower, and it makes
   printf less effective as a debugging tool when the FPU is hosed
   (e.g., due to a buggy softfloat implementation).

3. On i386, twiddle the rounding precision so that (2) works properly
   for long doubles.

4. Make several simplifications that are now possible due to (2).

5. Split __hldtoa() into a separate file.

Thanks to remko for access to a sparc64 box for testing.
2008-04-12 03:11:36 +00:00
das
d3ab161cfb Export gdtoa's __ULto{x,Q}_D2A routine in a private namespace so
libm can use it.
2007-12-16 21:15:57 +00:00
das
0ae05e01f7 Fix handling of subnormals on i386/ia64/amd64.
PR:	85080
2007-12-09 19:48:57 +00:00
das
3f2a2dba4d In scanf, round according to the current rounding mode. 2007-12-03 07:17:33 +00:00
jb
db332cba55 Use an intermediate pointer to avoid a strict aliasing warning.
Note that ULong in this code is actually defined as an unsigned integer across
all arches so that the gdtoa() function always processes 32 bit data
despite the unfortunate naming of "ULong".
2007-11-21 01:10:42 +00:00
deischen
5b067f00c5 Remove symbols that should not be exported.
Submitted by:	das
MFC after re@ approval
2007-10-13 14:40:16 +00:00
das
cdcf605760 Fix a rounding error.
Reported by: Bruno Haible
2007-05-08 02:59:37 +00:00
deischen
2a7306fdc5 Use C comments since we now preprocess these files with CPP. 2007-04-29 14:05:22 +00:00
das
59fd405588 Fix rounding of 0xf for hex fp formats.
PR:	90333
2007-01-03 04:57:58 +00:00
deischen
6c39badccc Don't export __gdtoa. The only known ports that rely on
this or the deprecated POSIX functions {e,g,f}cvt() have
newer versions that do not (rely on them).

Requested by:	marius
2006-04-15 15:35:20 +00:00
deischen
db7df4904a Add __gdtoa to the list of FreeBSD private symbols. Unfortunately,
this is used by some 3rd party applications when {e,f,g}cvt() are
not found.  POSIX defines the xcvt() funtions but says they are
deprecated in favor or sprintf().  We'll import these functions
from OpenBSD and remove __gdtoa() from the exported interfaces
when libc version is bumped.
2006-04-01 02:56:09 +00:00
deischen
a0f6b0f1d0 Add each directory's symbol map file to SYM_MAPS. 2006-03-13 01:15:01 +00:00
deischen
138dd54357 Add symbol maps and initial symbol version definitions to libc.
Reviewed by:	davidxu
2006-03-13 00:53:21 +00:00
das
8b8557483e Don't compile the gdtoa package's strtoIg.c into libc.
I never got around to making use of it.
2005-01-27 05:44:16 +00:00
das
d515c9d41c Cut out the gordian handling of subnormals by bit fiddling, and
instead use the FPU to convert subnormals to normals.  (NB: Further
simplification is possible, such as using the FPU for the rounding
step.)

This fixes a bug reported by stefanf where long double subnormals in
the Intel 80-bit format would be output with one fewer digit than
necessary when the default precision was used.
2005-01-18 18:44:07 +00:00
das
0bc7903301 Eliminate gdtoa.mk and move its contents to ${MACHINE_ARCH}/Makefile.inc.
The purpose of having a separate file involved an abandoned scheme that
would have kept contrib/gdtoa out of the include path for the rest of libc.
2005-01-15 05:23:58 +00:00
grehan
74fadada7a Updated manh shift constant type to 'ULL' for PPC to fix
shift-too-large compile error

reviewed by: das
2004-01-21 04:51:50 +00:00
das
06e5503ed1 Implement __hdtoa() and __hldtoa() and enable printf() support for %a
and %A, which print floating-point numbers in hexadecimal.
2004-01-18 10:32:49 +00:00
das
3fa98ba928 Fix a bug that caused long double subnormals to be printed
incorrectly on architectures without an explicit normalization
bit (sparc64, powerpc).
2004-01-18 07:53:49 +00:00
ru
2ca5a258fd Replaced an ugly hack to selectively disable warnings
in contributed sources with just a hack made possible
by bsd.sys.mk,v 1.33.  This is better because it just
nulls out the warning flags rather than adding gcc(1)
specific -w option to CFLAGS.
2004-01-11 10:42:47 +00:00
obrien
c8633d5cb9 Add an ulgy hack so that warnings added by non-zero WARNS values won't be
used with the contrib/ gdtoa sources as they aren't WARNS-clean.

Submitted by:	ru
2004-01-10 21:51:48 +00:00
das
502b55c20b Userland spinlocks bad. Sleep locks good.
Use the latter for gdtoa.

Requested by:	deischen (far too long ago)
2003-06-21 08:20:14 +00:00
das
97b1575d61 /strtopx/ s/result/&result/
This is the version I *meant* to commit last week.
2003-04-09 05:58:43 +00:00
das
2d9148b622 Add __ldtoa(), a wrapper around gdtoa() to make it look like dtoa().
In support of this, add some MD macros to assist in converting long
doubles to the format expected by gdtoa().

Reviewed by:	silence on standards@
2003-04-05 22:10:13 +00:00
obrien
eb82103523 Clean up the way gdtoa sources are found.
OK'ed by:	das
2003-03-13 18:55:14 +00:00
das
d02cfc3692 Replace our ancient dtoa/strtod implementation with the gdtoa
package, a more recent, generalized set of routines.  Among the
changes:
- Declare strtof() and strtold() in stdlib.h.
- Add glue to libc to support these routines for all kinds
  of ``long double''.
- Update printf() to reflect the fact that dtoa works slightly
  differently now.

As soon as I see that nothing has blown up, I will kill
src/lib/libc/stdlib/strtod.c.  Soon printf() will be able
to use the new routines to output long doubles without loss
of precision, but numerous bugs in the existing code must
be addressed first.

Reviewed by:	bde (briefly), mike (mentor), obrien
2003-03-12 20:30:00 +00:00