Commit Graph

10 Commits

Author SHA1 Message Date
David Schultz
76303a9735 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
Daniel Eischen
6fad3aaf15 Add each directory's symbol map file to SYM_MAPS. 2006-03-13 01:15:01 +00:00
David Schultz
2380daafe9 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
David Schultz
bd15659f64 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
David Schultz
8f59277300 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
Ruslan Ermilov
042a0b7e95 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
David E. O'Brien
6a86fe7b72 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
David Schultz
92b93b37c0 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
David E. O'Brien
120a95cb50 Clean up the way gdtoa sources are found.
OK'ed by:	das
2003-03-13 18:55:14 +00:00
David Schultz
6a66acb565 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