X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=include%2Ffloatformat.h;h=8869715bbafa936feb3d5b1c9d911ee8b9ae873e;hb=d2ca577995765e99c5cb21d30ab3baf81398ce39;hp=feb3260117c495348b51817e4bc2f0837f36a060;hpb=0d66a8212c145b418e7286380f0ecc7e55a197d2;p=gcc.git diff --git a/include/floatformat.h b/include/floatformat.h index feb3260117c..8869715bbaf 100644 --- a/include/floatformat.h +++ b/include/floatformat.h @@ -1,5 +1,5 @@ /* IEEE floating point support declarations, for GDB, the GNU Debugger. - Copyright 1991, 1994, 1995, 1997, 2000, 2003 Free Software Foundation, Inc. + Copyright (C) 1991-2017 Free Software Foundation, Inc. This file is part of GDB. @@ -15,38 +15,43 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software -Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #if !defined (FLOATFORMAT_H) #define FLOATFORMAT_H 1 #include "ansidecl.h" +#ifdef __cplusplus +extern "C" { +#endif + /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the bytes are concatenated according to the byteorder flag, then each of those fields is contiguous. We number the bits with 0 being the most significant (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field contains with the *_start and *_len fields. */ -/* What is the order of the bytes. */ +/* What is the order of the bytes? */ enum floatformat_byteorders { - /* Standard little endian byte order. EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ - floatformat_little, /* Standard big endian byte order. EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ - floatformat_big, /* Little endian byte order but big endian word order. EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ + floatformat_littlebyte_bigword, - floatformat_littlebyte_bigword - + /* VAX byte order. Little endian byte order with 16-bit words. The + following example is an illustration of the byte order only; VAX + doesn't have a fully IEEE compliant floating-point format. + EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ + floatformat_vax }; enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; @@ -61,8 +66,12 @@ struct floatformat unsigned int exp_start; unsigned int exp_len; - /* Amount added to "true" exponent. 0x3fff for many IEEE extendeds. */ - unsigned int exp_bias; + /* Bias added to a "true" exponent to form the biased exponent. It + is intentionally signed as, otherwize, -exp_bias can turn into a + very large number (e.g., given the exp_bias of 0x3fff and a 64 + bit long, the equation (long)(1 - exp_bias) evaluates to + 4294950914) instead of -16382). */ + int exp_bias; /* Exponent value which indicates NaN. This is the actual value stored in the float, not adjusted by the exp_bias. This usually consists of all one bits. */ @@ -76,10 +85,22 @@ struct floatformat /* Internal name for debugging. */ const char *name; + + /* Validator method. */ + int (*is_valid) (const struct floatformat *fmt, const void *from); + + /* Is the format actually the sum of two smaller floating point + formats (IBM long double, as described in + gcc/config/rs6000/darwin-ldouble-format)? If so, this is the + smaller format in question, and the fields sign_start through + intbit describe the first half. If not, this is NULL. */ + const struct floatformat *split_half; }; /* floatformats for IEEE single and double, big and little endian. */ +extern const struct floatformat floatformat_ieee_half_big; +extern const struct floatformat floatformat_ieee_half_little; extern const struct floatformat floatformat_ieee_single_big; extern const struct floatformat floatformat_ieee_single_little; extern const struct floatformat floatformat_ieee_double_big; @@ -89,6 +110,12 @@ extern const struct floatformat floatformat_ieee_double_little; extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; +/* floatformats for VAX. */ + +extern const struct floatformat floatformat_vax_f; +extern const struct floatformat floatformat_vax_d; +extern const struct floatformat floatformat_vax_g; + /* floatformats for various extendeds. */ extern const struct floatformat floatformat_i387_ext; @@ -103,24 +130,30 @@ extern const struct floatformat floatformat_ia64_spill_big; extern const struct floatformat floatformat_ia64_spill_little; extern const struct floatformat floatformat_ia64_quad_big; extern const struct floatformat floatformat_ia64_quad_little; +/* IBM long double (double+double). */ +extern const struct floatformat floatformat_ibm_long_double_big; +extern const struct floatformat floatformat_ibm_long_double_little; /* Convert from FMT to a double. FROM is the address of the extended float. Store the double in *TO. */ extern void -floatformat_to_double PARAMS ((const struct floatformat *, char *, double *)); +floatformat_to_double (const struct floatformat *, const void *, double *); /* The converse: convert the double *FROM to FMT and store where TO points. */ extern void -floatformat_from_double PARAMS ((const struct floatformat *, - double *, char *)); +floatformat_from_double (const struct floatformat *, const double *, void *); /* Return non-zero iff the data at FROM is a valid number in format FMT. */ extern int -floatformat_is_valid PARAMS ((const struct floatformat *fmt, char *from)); +floatformat_is_valid (const struct floatformat *fmt, const void *from); + +#ifdef __cplusplus +} +#endif #endif /* defined (FLOATFORMAT_H) */