/* atof_vax.c - turn a Flonum into a VAX floating point number
- Copyright (C) 1987 Free Software Foundation, Inc.
+ Copyright 1987, 1992, 1993, 1995, 1997, 1999, 2000
+ Free Software Foundation, Inc.
-This file is part of GAS, the GNU Assembler.
+ 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 1, or (at your option)
-any later version.
+ 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)
+ any later version.
-GAS is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ GAS is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-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, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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. */
- /* JF added these two for md_atof() */
#include "as.h"
-#include "flonum.h"
+static int atof_vax_sizeof PARAMS ((int));
+static int next_bits PARAMS ((int));
+static void make_invalid_floating_point_number PARAMS ((LITTLENUM_TYPE *));
+static int what_kind_of_float PARAMS ((int, int *, long *));
+static char *atof_vax PARAMS ((char *, int, LITTLENUM_TYPE *));
-
- /* Precision in LittleNums. */
+/* Precision in LittleNums. */
#define MAX_PRECISION (8)
#define H_PRECISION (8)
#define G_PRECISION (4)
#define D_PRECISION (4)
#define F_PRECISION (2)
- /* Length in LittleNums of guard bits. */
+/* Length in LittleNums of guard bits. */
#define GUARD (2)
-int /* Number of chars in flonum type 'letter'. */
+int flonum_gen2vax PARAMS ((int format_letter, FLONUM_TYPE * f,
+ LITTLENUM_TYPE * words));
+
+/* Number of chars in flonum type 'letter'. */
+static int
atof_vax_sizeof (letter)
- char letter;
+ int letter;
{
- int return_value;
+ int return_value;
/*
* Permitting uppercase letters is probably a bad idea.
return (return_value);
} /* atof_vax_sizeof */
-static const long mask [] = {
+static const long mask[] =
+{
0x00000000,
0x00000001,
0x00000003,
0x3fffffff,
0x7fffffff,
0xffffffff
- };
+};
\f
/* Shared between flonum_gen2vax and next_bits */
-static int bits_left_in_littlenum;
-static LITTLENUM_TYPE * littlenum_pointer;
-static LITTLENUM_TYPE * littlenum_end;
+static int bits_left_in_littlenum;
+static LITTLENUM_TYPE *littlenum_pointer;
+static LITTLENUM_TYPE *littlenum_end;
static int
next_bits (number_of_bits)
- int number_of_bits;
+ int number_of_bits;
{
- int return_value;
+ int return_value;
- if(littlenum_pointer<littlenum_end)
- return 0;
+ if (littlenum_pointer < littlenum_end)
+ return 0;
if (number_of_bits >= bits_left_in_littlenum)
{
- return_value = mask [bits_left_in_littlenum] & * littlenum_pointer;
+ return_value = mask[bits_left_in_littlenum] & *littlenum_pointer;
number_of_bits -= bits_left_in_littlenum;
return_value <<= number_of_bits;
bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS - number_of_bits;
- littlenum_pointer --;
- if(littlenum_pointer>=littlenum_end)
- return_value |= ( (* littlenum_pointer) >> (bits_left_in_littlenum) ) & mask [number_of_bits];
+ littlenum_pointer--;
+ if (littlenum_pointer >= littlenum_end)
+ return_value |= ((*littlenum_pointer) >> (bits_left_in_littlenum)) & mask[number_of_bits];
}
else
{
bits_left_in_littlenum -= number_of_bits;
- return_value = mask [number_of_bits] & ( (* littlenum_pointer) >> bits_left_in_littlenum);
+ return_value = mask[number_of_bits] & ((*littlenum_pointer) >> bits_left_in_littlenum);
}
return (return_value);
}
static void
make_invalid_floating_point_number (words)
- LITTLENUM_TYPE * words;
+ LITTLENUM_TYPE *words;
{
- * words = 0x8000; /* Floating Reserved Operand Code */
+ *words = 0x8000; /* Floating Reserved Operand Code */
}
\f
-static int /* 0 means letter is OK. */
+static int /* 0 means letter is OK. */
what_kind_of_float (letter, precisionP, exponent_bitsP)
- char letter; /* In: lowercase please. What kind of float? */
- int * precisionP; /* Number of 16-bit words in the float. */
- long * exponent_bitsP; /* Number of exponent bits. */
+ int letter; /* In: lowercase please. What kind of float? */
+ int *precisionP; /* Number of 16-bit words in the float. */
+ long *exponent_bitsP; /* Number of exponent bits. */
{
- int retval; /* 0: OK. */
+ int retval; /* 0: OK. */
retval = 0;
switch (letter)
{
case 'f':
- * precisionP = F_PRECISION;
- * exponent_bitsP = 8;
+ *precisionP = F_PRECISION;
+ *exponent_bitsP = 8;
break;
case 'd':
- * precisionP = D_PRECISION;
- * exponent_bitsP = 8;
+ *precisionP = D_PRECISION;
+ *exponent_bitsP = 8;
break;
case 'g':
- * precisionP = G_PRECISION;
- * exponent_bitsP = 11;
+ *precisionP = G_PRECISION;
+ *exponent_bitsP = 11;
break;
case 'h':
- * precisionP = H_PRECISION;
- * exponent_bitsP = 15;
+ *precisionP = H_PRECISION;
+ *exponent_bitsP = 15;
break;
default:
}
\f
/***********************************************************************\
-* *
-* Warning: this returns 16-bit LITTLENUMs, because that is *
-* what the VAX thinks in. 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! *
-* *
-\***********************************************************************/
-
-char * /* Return pointer past text consumed. */
+ * *
+ * Warning: this returns 16-bit LITTLENUMs, because that is *
+ * what the VAX thinks in. 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! *
+ * *
+ \***********************************************************************/
+
+static char * /* Return pointer past text consumed. */
atof_vax (str, what_kind, words)
- char * str; /* Text to convert to binary. */
- char what_kind; /* 'd', 'f', 'g', 'h' */
- LITTLENUM_TYPE * words; /* Build the binary here. */
+ char *str; /* Text to convert to binary. */
+ int what_kind; /* 'd', 'f', 'g', 'h' */
+ LITTLENUM_TYPE *words; /* Build the binary here. */
{
- FLONUM_TYPE f;
- LITTLENUM_TYPE bits [MAX_PRECISION + MAX_PRECISION + GUARD];
- /* Extra bits for zeroed low-order bits. */
- /* The 1st MAX_PRECISION are zeroed, */
- /* the last contain flonum bits. */
- char * return_value;
- int precision; /* Number of 16-bit words in the format. */
- long exponent_bits;
+ FLONUM_TYPE f;
+ LITTLENUM_TYPE bits[MAX_PRECISION + MAX_PRECISION + GUARD];
+ /* Extra bits for zeroed low-order bits. */
+ /* The 1st MAX_PRECISION are zeroed, */
+ /* the last contain flonum bits. */
+ char *return_value;
+ int precision; /* Number of 16-bit words in the format. */
+ long exponent_bits;
return_value = str;
- f . low = bits + MAX_PRECISION;
- f . high = NULL;
- f . leader = NULL;
- f . exponent = NULL;
- f . sign = '\0';
+ f.low = bits + MAX_PRECISION;
+ f.high = NULL;
+ f.leader = NULL;
+ f.exponent = 0;
+ f.sign = '\0';
- if (what_kind_of_float (what_kind, & precision, & exponent_bits))
+ if (what_kind_of_float (what_kind, &precision, &exponent_bits))
{
- return_value = NULL; /* We lost. */
+ return_value = NULL; /* We lost. */
make_invalid_floating_point_number (words);
}
+
if (return_value)
{
- bzero (bits, sizeof(LITTLENUM_TYPE) * MAX_PRECISION);
+ memset (bits, '\0', sizeof (LITTLENUM_TYPE) * MAX_PRECISION);
- /* Use more LittleNums than seems */
- /* necessary: the highest flonum may have */
- /* 15 leading 0 bits, so could be useless. */
- f . high = f . low + precision - 1 + GUARD;
+ /* Use more LittleNums than seems */
+ /* necessary: the highest flonum may have */
+ /* 15 leading 0 bits, so could be useless. */
+ f.high = f.low + precision - 1 + GUARD;
- if (atof_generic (& return_value, ".", "eE", & f))
+ if (atof_generic (&return_value, ".", "eE", &f))
{
make_invalid_floating_point_number (words);
return_value = NULL; /* we lost */
}
else
{
- if (flonum_gen2vax (what_kind, & f, words))
+ if (flonum_gen2vax (what_kind, &f, words))
{
return_value = NULL;
}
}
}
return (return_value);
-}
+} /* atof_vax() */
\f
/*
* In: a flonum, a vax floating point format.
* Out: a vax floating-point bit pattern.
*/
-int /* 0: OK. */
+int /* 0: OK. */
flonum_gen2vax (format_letter, f, words)
- char format_letter; /* One of 'd' 'f' 'g' 'h'. */
- FLONUM_TYPE * f;
- LITTLENUM_TYPE * words; /* Deliver answer here. */
+ int format_letter; /* One of 'd' 'f' 'g' 'h'. */
+ FLONUM_TYPE *f;
+ LITTLENUM_TYPE *words; /* Deliver answer here. */
{
- LITTLENUM_TYPE * lp;
- int precision;
- long exponent_bits;
- int return_value; /* 0 == OK. */
+ LITTLENUM_TYPE *lp;
+ int precision;
+ long exponent_bits;
+ int return_value; /* 0 == OK. */
+
+ return_value = what_kind_of_float (format_letter, &precision, &exponent_bits);
- return_value = what_kind_of_float (format_letter, & precision, & exponent_bits);
if (return_value != 0)
{
make_invalid_floating_point_number (words);
}
else
{
- if (f -> low > f -> leader)
+ if (f->low > f->leader)
{
- /* 0.0e0 seen. */
- bzero (words, sizeof(LITTLENUM_TYPE) * precision);
+ /* 0.0e0 seen. */
+ memset (words, '\0', sizeof (LITTLENUM_TYPE) * precision);
}
else
{
- long exponent_1;
- long exponent_2;
- long exponent_3;
- long exponent_4;
- int exponent_skippage;
- LITTLENUM_TYPE word1;
-
- /* JF: Deal with new Nan, +Inf and -Inf codes */
- if(f->sign!='-' && f->sign!='+') {
- make_invalid_floating_point_number(words);
- return return_value;
- }
+ long exponent_1;
+ long exponent_2;
+ long exponent_3;
+ long exponent_4;
+ int exponent_skippage;
+ LITTLENUM_TYPE word1;
+
+ /* JF: Deal with new Nan, +Inf and -Inf codes */
+ if (f->sign != '-' && f->sign != '+')
+ {
+ make_invalid_floating_point_number (words);
+ return return_value;
+ }
/*
- * All vaxen floating_point formats (so far) have:
- * Bit 15 is sign bit.
- * Bits 14:n are excess-whatever exponent.
- * Bits n-1:0 (if any) are most significant bits of fraction.
- * Bits 15:0 of the next word are the next most significant bits.
- * And so on for each other word.
- *
- * All this to be compatible with a KF11?? (Which is still faster
- * than lots of vaxen I can think of, but it also has higher
- * maintenance costs ... sigh).
- *
- * So we need: number of bits of exponent, number of bits of
- * mantissa.
- */
-
-#ifdef NEVER /******* This zeroing seems redundant - Dean 3may86 **********/
+ * All vaxen floating_point formats (so far) have:
+ * Bit 15 is sign bit.
+ * Bits 14:n are excess-whatever exponent.
+ * Bits n-1:0 (if any) are most significant bits of fraction.
+ * Bits 15:0 of the next word are the next most significant bits.
+ * And so on for each other word.
+ *
+ * All this to be compatible with a KF11?? (Which is still faster
+ * than lots of vaxen I can think of, but it also has higher
+ * maintenance costs ... sigh).
+ *
+ * So we need: number of bits of exponent, number of bits of
+ * mantissa.
+ */
+
+#ifdef NEVER /******* This zeroing seems redundant - Dean 3may86 **********/
/*
- * No matter how few bits we got back from the atof()
- * routine, add enough zero littlenums so the rest of the
- * code won't run out of "significant" bits in the mantissa.
- */
+ * No matter how few bits we got back from the atof()
+ * routine, add enough zero littlenums so the rest of the
+ * code won't run out of "significant" bits in the mantissa.
+ */
{
- LITTLENUM_TYPE * ltp;
- for (ltp = f -> leader + 1;
- ltp <= f -> low + precision;
- ltp ++)
+ LITTLENUM_TYPE *ltp;
+ for (ltp = f->leader + 1;
+ ltp <= f->low + precision;
+ ltp++)
{
- * ltp = 0;
+ *ltp = 0;
}
}
#endif
-
+
bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
- littlenum_pointer = f -> leader;
+ littlenum_pointer = f->leader;
littlenum_end = f->low;
/* Seek (and forget) 1st significant bit */
for (exponent_skippage = 0;
- ! next_bits(1);
- exponent_skippage ++)
- {
- }
- exponent_1 = f -> exponent + f -> leader + 1 - f -> low;
- /* Radix LITTLENUM_RADIX, point just higher than f -> leader. */
+ !next_bits (1);
+ exponent_skippage++);;
+
+ exponent_1 = f->exponent + f->leader + 1 - f->low;
+ /* Radix LITTLENUM_RADIX, point just higher than f->leader. */
exponent_2 = exponent_1 * LITTLENUM_NUMBER_OF_BITS;
- /* Radix 2. */
+ /* Radix 2. */
exponent_3 = exponent_2 - exponent_skippage;
- /* Forget leading zeros, forget 1st bit. */
+ /* Forget leading zeros, forget 1st bit. */
exponent_4 = exponent_3 + (1 << (exponent_bits - 1));
- /* Offset exponent. */
-
- if (exponent_4 & ~ mask [exponent_bits])
+ /* Offset exponent. */
+
+ if (exponent_4 & ~mask[exponent_bits])
{
/*
- * Exponent overflow. Lose immediately.
- */
-
+ * Exponent overflow. Lose immediately.
+ */
+
make_invalid_floating_point_number (words);
-
+
/*
- * We leave return_value alone: admit we read the
- * number, but return a floating exception
- * because we can't encode the number.
- */
+ * We leave return_value alone: admit we read the
+ * number, but return a floating exception
+ * because we can't encode the number.
+ */
}
else
{
lp = words;
-
- /* Word 1. Sign, exponent and perhaps high bits. */
- /* Assume 2's complement integers. */
- word1 = ((exponent_4 & mask [exponent_bits]) << (15 - exponent_bits))
- | ((f -> sign == '+') ? 0 : 0x8000)
- | next_bits (15 - exponent_bits);
- * lp ++ = word1;
-
- /* The rest of the words are just mantissa bits. */
+
+ /* Word 1. Sign, exponent and perhaps high bits. */
+ /* Assume 2's complement integers. */
+ word1 = (((exponent_4 & mask[exponent_bits]) << (15 - exponent_bits))
+ | ((f->sign == '+') ? 0 : 0x8000)
+ | next_bits (15 - exponent_bits));
+ *lp++ = word1;
+
+ /* The rest of the words are just mantissa bits. */
for (; lp < words + precision; lp++)
{
- * lp = next_bits (LITTLENUM_NUMBER_OF_BITS);
+ *lp = next_bits (LITTLENUM_NUMBER_OF_BITS);
}
-
+
if (next_bits (1))
{
/*
- * Since the NEXT bit is a 1, round UP the mantissa.
- * The cunning design of these hidden-1 floats permits
- * us to let the mantissa overflow into the exponent, and
- * it 'does the right thing'. However, we lose if the
- * highest-order bit of the lowest-order word flips.
- * Is that clear?
- */
-
- unsigned long carry;
-
+ * Since the NEXT bit is a 1, round UP the mantissa.
+ * The cunning design of these hidden-1 floats permits
+ * us to let the mantissa overflow into the exponent, and
+ * it 'does the right thing'. However, we lose if the
+ * highest-order bit of the lowest-order word flips.
+ * Is that clear?
+ */
+
+ unsigned long carry;
+
/*
- #if (sizeof(carry)) < ((sizeof(bits[0]) * BITS_PER_CHAR) + 2)
- Please allow at least 1 more bit in carry than is in a LITTLENUM.
- We need that extra bit to hold a carry during a LITTLENUM carry
- propagation. Another extra bit (kept 0) will assure us that we
- don't get a sticky sign bit after shifting right, and that
- permits us to propagate the carry without any masking of bits.
- #endif
- */
- for (carry = 1, lp --;
+ #if (sizeof(carry)) < ((sizeof(bits[0]) * BITS_PER_CHAR) + 2)
+ Please allow at least 1 more bit in carry than is in a LITTLENUM.
+ We need that extra bit to hold a carry during a LITTLENUM carry
+ propagation. Another extra bit (kept 0) will assure us that we
+ don't get a sticky sign bit after shifting right, and that
+ permits us to propagate the carry without any masking of bits.
+ #endif
+ */
+ for (carry = 1, lp--;
carry && (lp >= words);
- lp --)
+ lp--)
{
- carry = * lp + carry;
- * lp = carry;
+ carry = *lp + carry;
+ *lp = carry;
carry >>= LITTLENUM_NUMBER_OF_BITS;
}
-
- if ( (word1 ^ *words) & (1 << (LITTLENUM_NUMBER_OF_BITS - 1)) )
+
+ if ((word1 ^ *words) & (1 << (LITTLENUM_NUMBER_OF_BITS - 1)))
{
make_invalid_floating_point_number (words);
/*
- * We leave return_value alone: admit we read the
- * number, but return a floating exception
- * because we can't encode the number.
- */
+ * We leave return_value alone: admit we read the
+ * number, but return a floating exception
+ * because we can't encode the number.
+ */
}
} /* if (we needed to round up) */
} /* if (exponent overflow) */
} /* if (0.0e0) */
} /* if (float_type was OK) */
return (return_value);
-}
-
+} /* flonum_gen2vax() */
/* JF this used to be in vax.c but this looks like a better place for it */
/*
* md_atof()
*
- * In: input_line_pointer -> the 1st character of a floating-point
+ * In: input_line_pointer->the 1st character of a floating-point
* number.
* 1 letter denoting the type of statement that wants a
* binary floating point number returned.
* Assumed to be 'big enough'.
* Address of where to return size of literal (in chars).
*
- * Out: Input_line_pointer -> of next char after floating number.
- * Error message, or "".
+ * Out: Input_line_pointer->of next char after floating number.
+ * Error message, or 0.
* Floating point literal.
* Number of chars we used for the literal.
*/
-#define MAXIMUM_NUMBER_OF_LITTLENUMS (8) /* For .hfloats. */
+#define MAXIMUM_NUMBER_OF_LITTLENUMS (8) /* For .hfloats. */
char *
md_atof (what_statement_type, literalP, sizeP)
- char what_statement_type;
- char * literalP;
- int * sizeP;
+ int what_statement_type;
+ char *literalP;
+ int *sizeP;
{
- LITTLENUM_TYPE words [MAXIMUM_NUMBER_OF_LITTLENUMS];
- register char kind_of_float;
- register int number_of_chars;
- register LITTLENUM_TYPE * littlenum_pointer;
+ LITTLENUM_TYPE words[MAXIMUM_NUMBER_OF_LITTLENUMS];
+ register char kind_of_float;
+ register int number_of_chars;
+ register LITTLENUM_TYPE *littlenumP;
switch (what_statement_type)
{
if (kind_of_float)
{
- register LITTLENUM_TYPE * limit;
+ register LITTLENUM_TYPE *limit;
input_line_pointer = atof_vax (input_line_pointer,
kind_of_float,
* converting words to chars.
*/
number_of_chars = atof_vax_sizeof (kind_of_float);
- know( number_of_chars <= MAXIMUM_NUMBER_OF_LITTLENUMS * sizeof(LITTLENUM_TYPE) );
- limit = words + (number_of_chars / sizeof(LITTLENUM_TYPE));
- for (littlenum_pointer = words;
- littlenum_pointer < limit;
- littlenum_pointer ++)
+ know (number_of_chars <= MAXIMUM_NUMBER_OF_LITTLENUMS * sizeof (LITTLENUM_TYPE));
+ limit = words + (number_of_chars / sizeof (LITTLENUM_TYPE));
+ for (littlenumP = words; littlenumP < limit; littlenumP++)
{
- md_number_to_chars (literalP, * littlenum_pointer, sizeof(LITTLENUM_TYPE));
- literalP += sizeof(LITTLENUM_TYPE);
+ md_number_to_chars (literalP, *littlenumP, sizeof (LITTLENUM_TYPE));
+ literalP += sizeof (LITTLENUM_TYPE);
};
}
else
number_of_chars = 0;
};
- * sizeP = number_of_chars;
- return (kind_of_float ? "" : "Bad call to md_atof()");
-} /* md_atof() */
+ *sizeP = number_of_chars;
+ return kind_of_float ? NULL : _("Bad call to md_atof()");
+}
-/* atof_vax.c */
+/* end of atof-vax.c */
projects / binutils-gdb.git / blobdiff