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float128: Add strfromf128

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Add strfromf128 to stdlib when _Float128 support is enabled.

	* stdio-common/printf-parsemb.c (__parse_one_specmb): Initialize
	spec->info.is_binary128 to zero.
	* stdio-common/printf.h (printf_info): Add new member is_binary128
	to indicate that the number being converted to string is compatible
	with the IEC 60559 binary128 format.
	* stdio-common/printf_fp.c (__printf_fp_l): Add code to deal with
	_Float128 numbers.
	* stdio-common/printf_fphex.c: Include ieee754_float128.h and
	ldbl-128/printf_fphex_macros.h
	(__printf_fphex): Add code to deal with _Float128 numbers.
	* stdio-common/printf_size.c (__printf_size): Likewise.
	* stdio-common/vfprintf.c (process_arg): Initialize member
	info.is_binary128 to zero.
	* stdlib/fpioconst.h (FLT128_MAX_10_EXP_LOG): New macro.
	* stdlib/stdlib.h: Include bits/floatn.h for _Float128 support.
	(strfromf128): New declaration.
	* stdlib/strfrom-skeleton.c (STRFROM): Set member info.is_binary128
	to one.
	* sysdeps/ieee754/float128/Makefile: Add strfromf128.
	* sysdeps/ieee754/float128/Versions: Likewise.
	* sysdeps/ieee754/float128/strfromf128.c: New file.
This commit is contained in:
Gabriel F. T. Gomes
2016-11-03 12:37:08 -02:00
parent 2bc646c9e9
commit cf2046ec7d
13 changed files with 173 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
stdio-common/printf_fp.c
View File

@@ -218,6 +218,9 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
double dbl;
__long_double_t ldbl;
#if __HAVE_DISTINCT_FLOAT128
_Float128 f128;
#endif
}
fpnum;
@@ -234,9 +237,17 @@ __printf_fp_l (FILE *fp, locale_t loc,
const char *special = NULL;
const wchar_t *wspecial = NULL;
/* When _Float128 is enabled in the library and ABI-distinct from long
double, we need mp_limbs enough for any of them. */
#if __HAVE_DISTINCT_FLOAT128
# define GREATER_MANT_DIG FLT128_MANT_DIG
#else
# define GREATER_MANT_DIG LDBL_MANT_DIG
#endif
/* We need just a few limbs for the input before shifting to the right
position. */
mp_limb_t fp_input[(LDBL_MANT_DIG + BITS_PER_MP_LIMB - 1) / BITS_PER_MP_LIMB];
mp_limb_t fp_input[(GREATER_MANT_DIG + BITS_PER_MP_LIMB - 1)
/ BITS_PER_MP_LIMB];
/* We need to shift the contents of fp_input by this amount of bits. */
int to_shift = 0;
@@ -371,6 +382,11 @@ __printf_fp_l (FILE *fp, locale_t loc,
}
/* Fetch the argument value. */
#if __HAVE_DISTINCT_FLOAT128
if (info->is_binary128)
PRINTF_FP_FETCH (_Float128, fpnum.f128, float128, FLT128_MANT_DIG)
else
#endif
#ifndef __NO_LONG_DOUBLE_MATH
if (info->is_long_double && sizeof (long double) > sizeof (double))
PRINTF_FP_FETCH (long double, fpnum.ldbl, long_double, LDBL_MANT_DIG)
@@ -414,7 +430,8 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
mp_size_t bignum_size = ((abs (p.exponent) + BITS_PER_MP_LIMB - 1)
/ BITS_PER_MP_LIMB
+ (LDBL_MANT_DIG / BITS_PER_MP_LIMB > 2 ? 8 : 4))
+ (GREATER_MANT_DIG / BITS_PER_MP_LIMB > 2
? 8 : 4))
* sizeof (mp_limb_t);
p.frac = (mp_limb_t *) alloca (bignum_size);
p.tmp = (mp_limb_t *) alloca (bignum_size);
@@ -429,7 +446,15 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
/* |FP| >= 8.0. */
int scaleexpo = 0;
int explog = LDBL_MAX_10_EXP_LOG;
int explog;
#if __HAVE_DISTINCT_FLOAT128
if (info->is_binary128)
explog = FLT128_MAX_10_EXP_LOG;
else
explog = LDBL_MAX_10_EXP_LOG;
#else
explog = LDBL_MAX_10_EXP_LOG;
#endif
int exp10 = 0;
const struct mp_power *powers = &_fpioconst_pow10[explog + 1];
int cnt_h, cnt_l, i;
@@ -463,6 +488,27 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
if (p.scalesize == 0)
{
#if __HAVE_DISTINCT_FLOAT128
if ((FLT128_MANT_DIG
> _FPIO_CONST_OFFSET * BITS_PER_MP_LIMB)
&& info->is_binary128)
{
#define _FLT128_FPIO_CONST_SHIFT \
(((FLT128_MANT_DIG + BITS_PER_MP_LIMB - 1) / BITS_PER_MP_LIMB) \
- _FPIO_CONST_OFFSET)
/* 64bit const offset is not enough for
IEEE 854 quad long double (_Float128). */
p.tmpsize = powers->arraysize + _FLT128_FPIO_CONST_SHIFT;
memcpy (p.tmp + _FLT128_FPIO_CONST_SHIFT,
&__tens[powers->arrayoff],
p.tmpsize * sizeof (mp_limb_t));
MPN_ZERO (p.tmp, _FLT128_FPIO_CONST_SHIFT);
/* Adjust p.exponent, as scaleexpo will be this much
bigger too. */
p.exponent += _FLT128_FPIO_CONST_SHIFT * BITS_PER_MP_LIMB;
}
else
#endif /* __HAVE_DISTINCT_FLOAT128 */
#ifndef __NO_LONG_DOUBLE_MATH
if (LDBL_MANT_DIG > _FPIO_CONST_OFFSET * BITS_PER_MP_LIMB
&& info->is_long_double)
@@ -603,7 +649,15 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
/* |FP| < 1.0. */
int exp10 = 0;
int explog = LDBL_MAX_10_EXP_LOG;
int explog;
#if __HAVE_DISTINCT_FLOAT128
if (info->is_binary128)
explog = FLT128_MAX_10_EXP_LOG;
else
explog = LDBL_MAX_10_EXP_LOG;
#else
explog = LDBL_MAX_10_EXP_LOG;
#endif
const struct mp_power *powers = &_fpioconst_pow10[explog + 1];
/* Now shift the input value to its right place. */