diff options
Diffstat (limited to 'contrib/binutils/gas/config/atof-ieee.c')
| -rw-r--r-- | contrib/binutils/gas/config/atof-ieee.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/contrib/binutils/gas/config/atof-ieee.c b/contrib/binutils/gas/config/atof-ieee.c index 2a916cd..ce6afbb 100644 --- a/contrib/binutils/gas/config/atof-ieee.c +++ b/contrib/binutils/gas/config/atof-ieee.c @@ -1,5 +1,5 @@ /* atof_ieee.c - turn a Flonum into an IEEE floating point number - Copyright (C) 1987, 92, 93, 94, 95, 96, 97, 98, 99, 2000 + Copyright 1987, 1992, 1994, 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. This file is part of GAS, the GNU Assembler. @@ -19,6 +19,13 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +/* Some float formats are based on the IEEE standard, but use the + largest exponent for normal numbers instead of NaNs and infinites. + The macro TC_LARGEST_EXPONENT_IS_NORMAL should evaluate to true + if the target machine uses such a format. The macro can depend on + command line flags if necessary. There is no need to define the + macro if it would always be 0. */ + #include "as.h" /* Flonums returned here. */ @@ -40,6 +47,10 @@ extern const char EXP_CHARS[]; /* Length in LittleNums of guard bits. */ #define GUARD (2) +#ifndef TC_LARGEST_EXPONENT_IS_NORMAL +#define TC_LARGEST_EXPONENT_IS_NORMAL 0 +#endif + static const unsigned long mask[] = { 0x00000000, @@ -291,6 +302,8 @@ gen_to_words (words, precision, exponent_bits) /* NaN: Do the right thing. */ if (generic_floating_point_number.sign == 0) { + if (TC_LARGEST_EXPONENT_IS_NORMAL) + as_warn ("NaNs are not supported by this target\n"); if (precision == F_PRECISION) { words[0] = 0x7fff; @@ -328,6 +341,9 @@ gen_to_words (words, precision, exponent_bits) } else if (generic_floating_point_number.sign == 'P') { + if (TC_LARGEST_EXPONENT_IS_NORMAL) + as_warn ("Infinities are not supported by this target\n"); + /* +INF: Do the right thing. */ if (precision == F_PRECISION) { @@ -366,6 +382,9 @@ gen_to_words (words, precision, exponent_bits) } else if (generic_floating_point_number.sign == 'N') { + if (TC_LARGEST_EXPONENT_IS_NORMAL) + as_warn ("Infinities are not supported by this target\n"); + /* Negative INF. */ if (precision == F_PRECISION) { @@ -578,7 +597,9 @@ gen_to_words (words, precision, exponent_bits) return return_value; } - else if ((unsigned long) exponent_4 >= mask[exponent_bits]) + else if ((unsigned long) exponent_4 > mask[exponent_bits] + || (! TC_LARGEST_EXPONENT_IS_NORMAL + && (unsigned long) exponent_4 == mask[exponent_bits])) { /* Exponent overflow. Lose immediately. */ |
