- replace dtoa w/ David's gdtoa, version 2008-03-15

- provide proper dtoa locks
- use the real strtof implementation
- add strtold, __hdtoa, __hldtoa
- add %a/%A support
- don't lose precision in printf, don't round to double anymore
- implement extended-precision versions of libc functions: fpclassify,
isnan, isinf, signbit, isnormal, isfinite, now that the ieee.h is
fixed
- separate vax versions of strtof, and __hdtoa
- add complex math support.  added functions: cacos, casin, catan,
ccos, csin, ctan, cacosh, casinh, catanh, ccosh, csinh, ctanh, cexp,
clog, cabs, cpow, csqrt, carg, cimag, conj, cproj, creal, cacosf,
casinf, catanf, ccosf, csinf, ctanf, cacoshf, casinhf, catanhf,
ccoshf, csinhf, ctanhf, cexpf, clogf, cabsf, cpowf, csqrtf, cargf,
cimagf, conjf, cprojf, crealf
- add fdim, fmax, fmin
- add log2. (adapted implementation e_log.c.  could be more acruate
& faster, but it's good enough for now)
- remove wrappers & cruft in libm, supposed to work-around mistakes
in SVID, etc.;  use ieee versions.  fixes issues in python 2.6 for
djm@
- make _digittoint static
- proper definitions for i386, and amd64 in ieee.h
- sh, powerpc don't really have extended-precision
- add missing definitions for mips64 (quad), m{6,8}k (96-bit) float.h
for LDBL_*
- merge lead to frac for m{6,8}k, for gdtoa to work properly
- add FRAC*BITS & EXT_TO_ARRAY32 definitions in ieee.h, for hdtoa&ldtoa
to use
- add EXT_IMPLICIT_NBIT definition, which indicates implicit
normalization bit
- add regression tests for libc: fpclassify and printf
- arith.h & gd_qnan.h definitions
- update ieee.h: hppa doesn't have quad-precision, hppa64 does
- add missing prototypes to gdtoaimp
- on 64-bit platforms make sure gdtoa doesn't use a long when it
really wants an int
- etc., what i may have forgotten...
- bump libm major, due to removed&changed symbols
- no libc bump, since this is riding on djm's libc major crank from
a day ago

discussed with / requested by / testing theo, sthen@, djm@, jsg@,
merdely@, jsing@, tedu@, brad@, jakemsr@, and others.
looks good to millert@
parts of the diff ok kettenis@

this commit does not include:
- man page changes

1 files changed, 93 insertions, 0 deletions

diff --git a/lib/libc/gdtoa/strtord.c b/lib/libc/gdtoa/strtord.c
new file mode 100644
index 00000000000..709af4c713f
--- /dev/null
+++ b/lib/libc/gdtoa/strtord.c
@@ -0,0 +1,93 @@
+/****************************************************************
+
+The author of this software is David M. Gay.
+
+Copyright (C) 1998, 2000 by Lucent Technologies
+All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appear in all
+copies and that both that the copyright notice and this
+permission notice and warranty disclaimer appear in supporting
+documentation, and that the name of Lucent or any of its entities
+not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
+IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
+SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
+
+****************************************************************/
+
+/* Please send bug reports to David M. Gay (dmg at acm dot org,
+ * with " at " changed at "@" and " dot " changed to ".").	*/
+
+#include "gdtoaimp.h"
+
+ void
+#ifdef KR_headers
+ULtod(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
+#else
+ULtod(ULong *L, ULong *bits, Long exp, int k)
+#endif
+{
+	switch(k & STRTOG_Retmask) {
+	  case STRTOG_NoNumber:
+	  case STRTOG_Zero:
+		L[0] = L[1] = 0;
+		break;
+
+	  case STRTOG_Denormal:
+		L[_1] = bits[0];
+		L[_0] = bits[1];
+		break;
+
+	  case STRTOG_Normal:
+	  case STRTOG_NaNbits:
+		L[_1] = bits[0];
+		L[_0] = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
+		break;
+
+	  case STRTOG_Infinite:
+		L[_0] = 0x7ff00000;
+		L[_1] = 0;
+		break;
+
+	  case STRTOG_NaN:
+		L[0] = d_QNAN0;
+		L[1] = d_QNAN1;
+	  }
+	if (k & STRTOG_Neg)
+		L[_0] |= 0x80000000L;
+	}
+
+ int
+#ifdef KR_headers
+strtord(s, sp, rounding, d) CONST char *s; char **sp; int rounding; double *d;
+#else
+strtord(CONST char *s, char **sp, int rounding, double *d)
+#endif
+{
+	static FPI fpi0 = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI };
+	FPI *fpi, fpi1;
+	ULong bits[2];
+	Long exp;
+	int k;
+
+	fpi = &fpi0;
+	if (rounding != FPI_Round_near) {
+		fpi1 = fpi0;
+		fpi1.rounding = rounding;
+		fpi = &fpi1;
+		}
+	k = strtodg(s, sp, fpi, &exp, bits);
+	ULtod((ULong*)d, bits, exp, k);
+	return k;
+	}