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| author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2016-11-04 09:57:27 -0200 |
|---|---|---|
| committer | Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com> | 2017-06-07 16:58:42 -0300 |
| commit | 82c19bdfe39164fda779c79a925c2050b19e421b (patch) | |
| tree | 0867224cd0c83e3383fde82ac3875b61e1f7480f /stdlib/fpioconst.h | |
| parent | 81df4d253dc3184fb003e4737b917e8d35c341d1 (diff) | |
| download | glibc-82c19bdfe39164fda779c79a925c2050b19e421b.tar glibc-82c19bdfe39164fda779c79a925c2050b19e421b.tar.gz glibc-82c19bdfe39164fda779c79a925c2050b19e421b.tar.bz2 glibc-82c19bdfe39164fda779c79a925c2050b19e421b.zip | |
float128: Extend the power of ten tables
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.
Diffstat (limited to 'stdlib/fpioconst.h')
| -rw-r--r-- | stdlib/fpioconst.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/stdlib/fpioconst.h b/stdlib/fpioconst.h index 6fc476b074..2559d7a74c 100644 --- a/stdlib/fpioconst.h +++ b/stdlib/fpioconst.h @@ -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 |