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float128: Extend the power of ten tables

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Update the power of ten tables used by the common implementation when long
double is not the most expressive real type.

	* stdlib/fpioconst.h: Include bits/floatn.h.
	(FPIOCONST_HAVE_EXTENDED_RANGE): New macro for testing how big the
	power of ten table should be.
	(FPIOCONST_POW10_ARRAY_SIZE): Use larger table if above is true.
	* stdlib/fpioconst.c (__tens): Use FPIOCONST_HAVE_EXTENDED_RANGE
	to include larger tables when _Float128 support is enabled.
	(_fpioconst_pow10): Likewise.
This commit is contained in:
Paul E. Murphy 2016-11-04 09:57:27 -02:00 committed by Gabriel F. T. Gomes
parent 81df4d253d
commit 82c19bdfe3
3 changed files with 26 additions and 6 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2017-06-07 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
* stdlib/fpioconst.h: Include bits/floatn.h.
(FPIOCONST_HAVE_EXTENDED_RANGE): New macro for testing how big the
power of ten table should be.
(FPIOCONST_POW10_ARRAY_SIZE): Use larger table if above is true.
* stdlib/fpioconst.c (__tens): Use FPIOCONST_HAVE_EXTENDED_RANGE
to include larger tables when _Float128 support is enabled.
(_fpioconst_pow10): Likewise.
2017-06-07 Joseph Myers <joseph@codesourcery.com>
* include/bits/types/clock_t.h: Use #include <path> instead of

8
stdlib/fpioconst.c
View file

@ -112,7 +112,7 @@ const mp_limb_t __tens[] =
0xd2db49ef, 0x926c3f5b, 0xae6209d4, 0x2d433949, 0x34f4a3c6, 0xd4305d94,
0xd9d61a05, 0x00000325,
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
#if FPIOCONST_HAVE_EXTENDED_RANGE
# define TENS_P11_IDX (TENS_P10_IDX + TENS_P10_SIZE)
# define TENS_P11_SIZE 215
[TENS_P11_IDX] = 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
@ -659,7 +659,7 @@ const mp_limb_t __tens[] =
0x6d6c0267, 0x06f9c25b, 0xbd6078e0, 0xb5fcdc81, 0xd742fa41, 0xcccc2399,
0xc691adc0, 0x215ad82c, 0xea73b0c3, 0xa511e5b0, 0xf499e0a6, 0x53e27ab0,
0xd94440a2, 0x47752521, 0x9a6e3644, 0xab113708, 0x8f8b301d, 0x058a42a3,
#endif /* !__NO_LONG_DOUBLE_MATH */
#endif /* FPIOCONST_HAVE_EXTENDED_RANGE */
};
#elif BITS_PER_MP_LIMB == 64
@ -748,7 +748,7 @@ const mp_limb_t __tens[] =
0xd2db49ef47187094ull, 0xae6209d4926c3f5bull, 0x34f4a3c62d433949ull,
0xd9d61a05d4305d94ull, 0x0000000000000325ull,
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
#if FPIOCONST_HAVE_EXTENDED_RANGE
# define TENS_P11_IDX (TENS_P10_IDX + TENS_P10_SIZE)
# define TENS_P11_SIZE 108
[TENS_P11_IDX] = 0x0000000000000000ull, 0x0000000000000000ull,
@ -1320,7 +1320,7 @@ const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE] =
{ TENS_P8_IDX, TENS_P8_SIZE, 851, 848 },
{ TENS_P9_IDX, TENS_P9_SIZE, 1701, 1698 },
{ TENS_P10_IDX, TENS_P10_SIZE, 3402, 3399 },
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
#if FPIOCONST_HAVE_EXTENDED_RANGE
{ TENS_P11_IDX, TENS_P11_SIZE, 6804, 6800 },
{ TENS_P12_IDX, TENS_P12_SIZE, 13607, 13604 },
{ TENS_P13_IDX, TENS_P13_SIZE, 27214, 27210 },

14
stdlib/fpioconst.h
View file

@ -40,9 +40,19 @@
#define DBL_MAX_10_EXP_LOG 8 /* = floor(log_2(DBL_MAX_10_EXP)) */
#define FLT_MAX_10_EXP_LOG 5 /* = floor(log_2(FLT_MAX_10_EXP)) */
/* On some machines, _Float128 may be ABI-distinct from long double (e.g
IBM extended precision). */
#include <bits/floatn.h>
/* For strtold, we need powers of 10 up to floor (log_2 (LDBL_MANT_DIG
- LDBL_MIN_EXP + 2)). */
#if !defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024
- LDBL_MIN_EXP + 2)). When _Float128 is enabled in libm and it is
ABI-distinct from long double (e.g. on powerpc64le), we also need powers
of 10 up to floor (log_2 (FLT128_MANT_DIG - FLT128_MIN_EXP + 2)). */
#define FPIOCONST_HAVE_EXTENDED_RANGE \
((!defined __NO_LONG_DOUBLE_MATH && __LDBL_MAX_EXP__ > 1024) \
|| __HAVE_DISTINCT_FLOAT128)
#if FPIOCONST_HAVE_EXTENDED_RANGE
# define FPIOCONST_POW10_ARRAY_SIZE 15
#else
# define FPIOCONST_POW10_ARRAY_SIZE 11