/* atof_ieee.c - turn a Flonum into an IEEE floating point number
- Copyright 1987, 1992, 1994, 1996, 1997, 1998, 1999, 2000, 2001
- Free Software Foundation, Inc.
+ Copyright (C) 1987-2019 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#include "as.h"
/* Flonums returned here. */
extern FLONUM_TYPE generic_floating_point_number;
-static int next_bits PARAMS ((int));
-static void unget_bits PARAMS ((int));
-static void make_invalid_floating_point_number PARAMS ((LITTLENUM_TYPE *));
-
-extern const char EXP_CHARS[];
/* Precision in LittleNums. */
/* Don't count the gap in the m68k extended precision format. */
-#define MAX_PRECISION (5)
-#define F_PRECISION (2)
-#define D_PRECISION (4)
-#define X_PRECISION (5)
-#define P_PRECISION (5)
+#define MAX_PRECISION 5
+#define H_PRECISION 1
+#define F_PRECISION 2
+#define D_PRECISION 4
+#define X_PRECISION 5
+#define P_PRECISION 5
/* Length in LittleNums of guard bits. */
-#define GUARD (2)
+#define GUARD 2
#ifndef TC_LARGEST_EXPONENT_IS_NORMAL
#define TC_LARGEST_EXPONENT_IS_NORMAL(PRECISION) 0
static LITTLENUM_TYPE *littlenum_pointer;
static int
-next_bits (number_of_bits)
- int number_of_bits;
+next_bits (int number_of_bits)
{
int return_value;
if (!littlenums_left)
- return (0);
+ return 0;
+
if (number_of_bits >= bits_left_in_littlenum)
{
return_value = mask[bits_left_in_littlenum] & *littlenum_pointer;
/* Num had better be less than LITTLENUM_NUMBER_OF_BITS. */
static void
-unget_bits (num)
- int num;
+unget_bits (int num)
{
if (!littlenums_left)
{
}
static void
-make_invalid_floating_point_number (words)
- LITTLENUM_TYPE *words;
+make_invalid_floating_point_number (LITTLENUM_TYPE *words)
{
as_bad (_("cannot create floating-point number"));
/* Zero the leftmost bit. */
words[4] = (LITTLENUM_TYPE) -1;
words[5] = (LITTLENUM_TYPE) -1;
}
-\f
-/* Warning: This returns 16-bit LITTLENUMs. It is up to the caller to
- figure out any alignment problems and to conspire for the
- bytes/word to be emitted in the right order. Bigendians beware! */
-/* Note that atof-ieee always has X and P precisions enabled. it is up
- to md_atof to filter them out if the target machine does not support
- them. */
+/* Build a floating point constant at str into a IEEE floating
+ point number. This function does the same thing as atof_ieee
+ however it allows more control over the exact format, i.e.
+ explicitly specifying the precision and number of exponent bits
+ instead of relying on this infomation being deduced from a given type.
-/* Returns pointer past text consumed. */
+ If generic_float_info is not NULL then it will be set to contain generic
+ infomation about the parsed floating point number.
+ Returns pointer past text consumed. */
char *
-atof_ieee (str, what_kind, words)
- char *str; /* Text to convert to binary. */
- int what_kind; /* 'd', 'f', 'g', 'h'. */
- LITTLENUM_TYPE *words; /* Build the binary here. */
+atof_ieee_detail (char * str,
+ int precision,
+ int exponent_bits,
+ LITTLENUM_TYPE * words,
+ FLONUM_TYPE * generic_float_info)
{
/* Extra bits for zeroed low-order bits.
The 1st MAX_PRECISION are zeroed, the last contain flonum bits. */
static LITTLENUM_TYPE bits[MAX_PRECISION + MAX_PRECISION + GUARD];
char *return_value;
+
/* Number of 16-bit words in the format. */
- int precision;
- long exponent_bits;
FLONUM_TYPE save_gen_flonum;
/* We have to save the generic_floating_point_number because it
memset (bits, '\0', sizeof (LITTLENUM_TYPE) * MAX_PRECISION);
+ generic_floating_point_number.high
+ = generic_floating_point_number.low + precision - 1 + GUARD;
+
+ if (atof_generic (&return_value, ".", EXP_CHARS,
+ &generic_floating_point_number))
+ {
+ make_invalid_floating_point_number (words);
+ return NULL;
+ }
+
+ if (generic_float_info)
+ *generic_float_info = generic_floating_point_number;
+
+ gen_to_words (words, precision, exponent_bits);
+
+ /* Restore the generic_floating_point_number's storage alloc (and
+ everything else). */
+ generic_floating_point_number = save_gen_flonum;
+
+ return return_value;
+}
+
+/* Warning: This returns 16-bit LITTLENUMs. It is up to the caller to
+ figure out any alignment problems and to conspire for the
+ bytes/word to be emitted in the right order. Bigendians beware! */
+
+/* Note that atof-ieee always has X and P precisions enabled. it is up
+ to md_atof to filter them out if the target machine does not support
+ them. */
+
+/* Returns pointer past text consumed. */
+char *
+atof_ieee (char *str, /* Text to convert to binary. */
+ int what_kind, /* 'd', 'f', 'x', 'p'. */
+ LITTLENUM_TYPE *words) /* Build the binary here. */
+{
+ int precision;
+ long exponent_bits;
+
switch (what_kind)
{
+ case 'h':
+ case 'H':
+ precision = H_PRECISION;
+ exponent_bits = 5;
+ break;
+
case 'f':
case 'F':
case 's':
case 'p':
case 'P':
-
precision = P_PRECISION;
exponent_bits = -1;
break;
return (NULL);
}
- generic_floating_point_number.high
- = generic_floating_point_number.low + precision - 1 + GUARD;
-
- if (atof_generic (&return_value, ".", EXP_CHARS,
- &generic_floating_point_number))
- {
- make_invalid_floating_point_number (words);
- return (NULL);
- }
- gen_to_words (words, precision, exponent_bits);
-
- /* Restore the generic_floating_point_number's storage alloc (and
- everything else). */
- generic_floating_point_number = save_gen_flonum;
-
- return return_value;
+ return atof_ieee_detail (str, precision, exponent_bits, words, NULL);
}
/* Turn generic_floating_point_number into a real float/double/extended. */
int
-gen_to_words (words, precision, exponent_bits)
- LITTLENUM_TYPE *words;
- int precision;
- long exponent_bits;
+gen_to_words (LITTLENUM_TYPE *words, int precision, long exponent_bits)
{
int return_value = 0;
if (generic_floating_point_number.sign == 0)
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn ("NaNs are not supported by this target\n");
- if (precision == F_PRECISION)
+ as_warn (_("NaNs are not supported by this target"));
+
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0x7fff;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0x7fff;
words[1] = 0xffff;
else if (generic_floating_point_number.sign == 'P')
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn ("Infinities are not supported by this target\n");
+ as_warn (_("Infinities are not supported by this target"));
/* +INF: Do the right thing. */
- if (precision == F_PRECISION)
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0x7c00;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0x7f80;
words[1] = 0;
else if (generic_floating_point_number.sign == 'N')
{
if (TC_LARGEST_EXPONENT_IS_NORMAL (precision))
- as_warn ("Infinities are not supported by this target\n");
+ as_warn (_("Infinities are not supported by this target"));
/* Negative INF. */
- if (precision == F_PRECISION)
+ if (precision == H_PRECISION)
+ {
+ words[0] = 0xfc00;
+ }
+ else if (precision == F_PRECISION)
{
words[0] = 0xff80;
words[1] = 0x0;
- generic_floating_point_number.low);
/* Seek (and forget) 1st significant bit. */
- for (exponent_skippage = 0; !next_bits (1); ++exponent_skippage);;
+ for (exponent_skippage = 0; !next_bits (1); ++exponent_skippage);
exponent_1 = (generic_floating_point_number.exponent
+ generic_floating_point_number.leader
+ 1
but return a floating exception because we can't encode
the number. */
*words &= ~(1 << (LITTLENUM_NUMBER_OF_BITS - 1));
-#if 0
- make_invalid_floating_point_number (words);
- return return_value;
-#endif
}
}
return return_value;
}
-#if 0
-/* Unused. */
-/* This routine is a real kludge. Someone really should do it better,
- but I'm too lazy, and I don't understand this stuff all too well
- anyway. (JF) */
-
-static void
-int_to_gen (x)
- long x;
-{
- char buf[20];
- char *bufp;
-
- sprintf (buf, "%ld", x);
- bufp = &buf[0];
- if (atof_generic (&bufp, ".", EXP_CHARS, &generic_floating_point_number))
- as_bad (_("Error converting number to floating point (Exponent overflow?)"));
-}
-#endif
-
#ifdef TEST
char *
print_gen (gen)
return (sbuf);
}
+#endif
+
+/* This is a utility function called from various tc-*.c files. It
+ is here in order to reduce code duplication.
+ Turn a string at input_line_pointer into a floating point constant
+ of type TYPE (a character found in the FLT_CHARS macro), and store
+ it as LITTLENUMS in the bytes buffer LITP. The number of chars
+ emitted is stored in *SIZEP. BIG_WORDIAN is TRUE if the littlenums
+ should be emitted most significant littlenum first.
+
+ An error message is returned, or a NULL pointer if everything went OK. */
+
+const char *
+ieee_md_atof (int type,
+ char *litP,
+ int *sizeP,
+ bfd_boolean big_wordian)
+{
+ LITTLENUM_TYPE words[MAX_LITTLENUMS];
+ LITTLENUM_TYPE *wordP;
+ char *t;
+ int prec = 0;
+
+ if (strchr (FLT_CHARS, type) != NULL)
+ {
+ switch (type)
+ {
+ case 'H':
+ case 'h':
+ prec = H_PRECISION;
+ break;
+
+ case 'f':
+ case 'F':
+ case 's':
+ case 'S':
+ prec = F_PRECISION;
+ break;
+
+ case 'd':
+ case 'D':
+ case 'r':
+ case 'R':
+ prec = D_PRECISION;
+ break;
+
+ case 't':
+ case 'T':
+ prec = X_PRECISION;
+ type = 'x'; /* This is what atof_ieee() understands. */
+ break;
+
+ case 'x':
+ case 'X':
+ case 'p':
+ case 'P':
+#ifdef TC_M68K
+ /* Note: on the m68k there is a gap of 16 bits (one littlenum)
+ between the exponent and mantissa. Hence the precision is
+ 6 and not 5. */
+ prec = P_PRECISION + 1;
+#else
+ prec = P_PRECISION;
#endif
+ break;
+
+ default:
+ break;
+ }
+ }
+ /* The 'f' and 'd' types are always recognised, even if the target has
+ not put them into the FLT_CHARS macro. This is because the 'f' type
+ can come from the .dc.s, .dcb.s, .float or .single pseudo-ops and the
+ 'd' type from the .dc.d, .dbc.d or .double pseudo-ops.
+
+ The 'x' type is not implicitly recognised however, even though it can
+ be generated by the .dc.x and .dbc.x pseudo-ops because not all targets
+ can support floating point values that big. ie the target has to
+ explicitly allow them by putting them into FLT_CHARS. */
+ else if (type == 'f')
+ prec = F_PRECISION;
+ else if (type == 'd')
+ prec = D_PRECISION;
+
+ if (prec == 0)
+ {
+ *sizeP = 0;
+ return _("Unrecognized or unsupported floating point constant");
+ }
+
+ gas_assert (prec <= MAX_LITTLENUMS);
+
+ t = atof_ieee (input_line_pointer, type, words);
+ if (t)
+ input_line_pointer = t;
+
+ *sizeP = prec * sizeof (LITTLENUM_TYPE);
+
+ if (big_wordian)
+ {
+ for (wordP = words; prec --;)
+ {
+ md_number_to_chars (litP, (valueT) (* wordP ++), sizeof (LITTLENUM_TYPE));
+ litP += sizeof (LITTLENUM_TYPE);
+ }
+ }
+ else
+ {
+ for (wordP = words + prec; prec --;)
+ {
+ md_number_to_chars (litP, (valueT) (* -- wordP), sizeof (LITTLENUM_TYPE));
+ litP += sizeof (LITTLENUM_TYPE);
+ }
+ }
+
+ return NULL;
+}
projects / deliverable / binutils-gdb.git / blobdiff