/* Floating point routines for GDB, the GNU debugger.
Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007
+ 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2007, 2008, 2009
Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Support for converting target fp numbers into host DOUBLEST format. */
if (order != fmt->byteorder)
ufrom = newfrom;
+ if (fmt->split_half)
+ {
+ DOUBLEST dtop, dbot;
+ floatformat_to_doublest (fmt->split_half, ufrom, &dtop);
+ /* Preserve the sign of 0, which is the sign of the top
+ half. */
+ if (dtop == 0.0)
+ {
+ *to = dtop;
+ return;
+ }
+ floatformat_to_doublest (fmt->split_half,
+ ufrom + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2,
+ &dbot);
+ *to = dtop + dbot;
+ return;
+ }
+
exponent = get_field (ufrom, order, fmt->totalsize, fmt->exp_start,
fmt->exp_len);
/* Note that if exponent indicates a NaN, we can't really do anything useful
memcpy (&dfrom, from, sizeof (dfrom));
memset (uto, 0, (fmt->totalsize + FLOATFORMAT_CHAR_BIT - 1)
/ FLOATFORMAT_CHAR_BIT);
+
+ if (fmt->split_half)
+ {
+ /* Use static volatile to ensure that any excess precision is
+ removed via storing in memory, and so the top half really is
+ the result of converting to double. */
+ static volatile double dtop, dbot;
+ DOUBLEST dtopnv, dbotnv;
+ dtop = (double) dfrom;
+ /* If the rounded top half is Inf, the bottom must be 0 not NaN
+ or Inf. */
+ if (dtop + dtop == dtop && dtop != 0.0)
+ dbot = 0.0;
+ else
+ dbot = (double) (dfrom - (DOUBLEST) dtop);
+ dtopnv = dtop;
+ dbotnv = dbot;
+ floatformat_from_doublest (fmt->split_half, &dtopnv, uto);
+ floatformat_from_doublest (fmt->split_half, &dbotnv,
+ (uto
+ + fmt->totalsize / FLOATFORMAT_CHAR_BIT / 2));
+ return;
+ }
+
if (dfrom == 0)
return; /* Result is zero */
if (dfrom != dfrom) /* Result is NaN */
but not passed on by GDB. This should be fixed. */
static const struct floatformat *
-floatformat_from_length (int len)
+floatformat_from_length (struct gdbarch *gdbarch, int len)
{
const struct floatformat *format;
- if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
- format = TARGET_FLOAT_FORMAT[TARGET_BYTE_ORDER];
- else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
- format = TARGET_DOUBLE_FORMAT[TARGET_BYTE_ORDER];
- else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
- format = TARGET_LONG_DOUBLE_FORMAT[TARGET_BYTE_ORDER];
+ if (len * TARGET_CHAR_BIT == gdbarch_float_bit (gdbarch))
+ format = gdbarch_float_format (gdbarch)
+ [gdbarch_byte_order (gdbarch)];
+ else if (len * TARGET_CHAR_BIT == gdbarch_double_bit (gdbarch))
+ format = gdbarch_double_format (gdbarch)
+ [gdbarch_byte_order (gdbarch)];
+ else if (len * TARGET_CHAR_BIT == gdbarch_long_double_bit (gdbarch))
+ format = gdbarch_long_double_format (gdbarch)
+ [gdbarch_byte_order (gdbarch)];
/* On i386 the 'long double' type takes 96 bits,
while the real number of used bits is only 80,
both in processor and in memory.
The code below accepts the real bit size. */
- else if ((TARGET_LONG_DOUBLE_FORMAT != NULL)
- && (len * TARGET_CHAR_BIT ==
- TARGET_LONG_DOUBLE_FORMAT[0]->totalsize))
- format = TARGET_LONG_DOUBLE_FORMAT[TARGET_BYTE_ORDER];
+ else if ((gdbarch_long_double_format (gdbarch) != NULL)
+ && (len * TARGET_CHAR_BIT
+ == gdbarch_long_double_format (gdbarch)[0]->totalsize))
+ format = gdbarch_long_double_format (gdbarch)
+ [gdbarch_byte_order (gdbarch)];
else
format = NULL;
if (format == NULL)
const struct floatformat *
floatformat_from_type (const struct type *type)
{
+ struct gdbarch *gdbarch = get_type_arch (type);
gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT);
if (TYPE_FLOATFORMAT (type) != NULL)
- return TYPE_FLOATFORMAT (type)[TARGET_BYTE_ORDER];
+ return TYPE_FLOATFORMAT (type)[gdbarch_byte_order (gdbarch)];
else
- return floatformat_from_length (TYPE_LENGTH (type));
-}
-
-/* If the host doesn't define NAN, use zero instead. */
-#ifndef NAN
-#define NAN 0.0
-#endif
-
-/* Extract a floating-point number of length LEN from a target-order
- byte-stream at ADDR. Returns the value as type DOUBLEST. */
-
-static DOUBLEST
-extract_floating_by_length (const void *addr, int len)
-{
- const struct floatformat *fmt = floatformat_from_length (len);
- DOUBLEST val;
-
- floatformat_to_doublest (fmt, addr, &val);
- return val;
-}
-
-DOUBLEST
-deprecated_extract_floating (const void *addr, int len)
-{
- return extract_floating_by_length (addr, len);
-}
-
-/* Store VAL as a floating-point number of length LEN to a
- target-order byte-stream at ADDR. */
-
-static void
-store_floating_by_length (void *addr, int len, DOUBLEST val)
-{
- const struct floatformat *fmt = floatformat_from_length (len);
-
- floatformat_from_doublest (fmt, &val, addr);
-}
-
-void
-deprecated_store_floating (void *addr, int len, DOUBLEST val)
-{
- store_floating_by_length (addr, len, val);
+ return floatformat_from_length (gdbarch, TYPE_LENGTH (type));
}
/* Extract a floating-point number of type TYPE from a target-order
DOUBLEST
extract_typed_floating (const void *addr, const struct type *type)
{
+ const struct floatformat *fmt = floatformat_from_type (type);
DOUBLEST retval;
- gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT);
-
- if (TYPE_FLOATFORMAT (type) == NULL)
- /* Not all code remembers to set the FLOATFORMAT (language
- specific code? stabs?) so handle that here as a special case. */
- return extract_floating_by_length (addr, TYPE_LENGTH (type));
-
- floatformat_to_doublest (TYPE_FLOATFORMAT (type)[TARGET_BYTE_ORDER],
- addr, &retval);
+ floatformat_to_doublest (fmt, addr, &retval);
return retval;
}
void
store_typed_floating (void *addr, const struct type *type, DOUBLEST val)
{
- gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT);
+ const struct floatformat *fmt = floatformat_from_type (type);
/* FIXME: kettenis/2001-10-28: It is debatable whether we should
zero out any remaining bytes in the target buffer when TYPE is
See also the function convert_typed_floating below. */
memset (addr, 0, TYPE_LENGTH (type));
- if (TYPE_FLOATFORMAT (type) == NULL)
- /* Not all code remembers to set the FLOATFORMAT (language
- specific code? stabs?) so handle that here as a special case. */
- store_floating_by_length (addr, TYPE_LENGTH (type), val);
- else
- floatformat_from_doublest (TYPE_FLOATFORMAT (type)[TARGET_BYTE_ORDER],
- &val, addr);
+ floatformat_from_doublest (fmt, &val, addr);
}
/* Convert a floating-point number of type FROM_TYPE from a
const struct floatformat *from_fmt = floatformat_from_type (from_type);
const struct floatformat *to_fmt = floatformat_from_type (to_type);
- gdb_assert (TYPE_CODE (from_type) == TYPE_CODE_FLT);
- gdb_assert (TYPE_CODE (to_type) == TYPE_CODE_FLT);
-
if (from_fmt == NULL || to_fmt == NULL)
{
/* If we don't know the floating-point format of FROM_TYPE or
else
{
/* The floating-point types don't match. The best we can do
- (aport from simulating the target FPU) is converting to the
+ (apart from simulating the target FPU) is converting to the
widest floating-point type supported by the host, and then
again to the desired type. */
DOUBLEST d;
projects / deliverable / binutils-gdb.git / blobdiff