/* atof_vax.c - turn a Flonum into a VAX floating point number
- Copyright (C) 1987 Free Software Foundation, Inc.
-
+ Copyright (C) 1987-2020 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,
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. */
+ along with GAS; see the file COPYING. If not, write to the Free
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
-/* JF added these two for md_atof() */
#include "as.h"
-#include "flonum.h"
+/* 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. */
+#define GUARD 2
-/* Precision in LittleNums. */
-#define MAX_PRECISION (8)
-#define H_PRECISION (8)
-#define G_PRECISION (4)
-#define D_PRECISION (4)
-#define F_PRECISION (2)
+int flonum_gen2vax (int, FLONUM_TYPE *, LITTLENUM_TYPE *);
-/* Length in LittleNums of guard bits. */
-#define GUARD (2)
+/* Number of chars in flonum type 'letter'. */
-int /* Number of chars in flonum type 'letter'. */
- atof_vax_sizeof (letter)
-char letter;
+static unsigned int
+atof_vax_sizeof (int letter)
{
- int return_value;
-
- /*
- * Permitting uppercase letters is probably a bad idea.
- * Please use only lower-cased letters in case the upper-cased
- * ones become unsupported!
- */
- switch (letter)
- {
- case 'f':
- case 'F':
- return_value = 4;
- break;
-
- case 'd':
- case 'D':
- case 'g':
- case 'G':
- return_value = 8;
- break;
-
- case 'h':
- case 'H':
- return_value = 16;
- break;
-
- default:
- return_value = 0;
- break;
- }
- return (return_value);
-} /* atof_vax_sizeof */
-
-static const long mask [] = {
- 0x00000000,
- 0x00000001,
- 0x00000003,
- 0x00000007,
- 0x0000000f,
- 0x0000001f,
- 0x0000003f,
- 0x0000007f,
- 0x000000ff,
- 0x000001ff,
- 0x000003ff,
- 0x000007ff,
- 0x00000fff,
- 0x00001fff,
- 0x00003fff,
- 0x00007fff,
- 0x0000ffff,
- 0x0001ffff,
- 0x0003ffff,
- 0x0007ffff,
- 0x000fffff,
- 0x001fffff,
- 0x003fffff,
- 0x007fffff,
- 0x00ffffff,
- 0x01ffffff,
- 0x03ffffff,
- 0x07ffffff,
- 0x0fffffff,
- 0x1fffffff,
- 0x3fffffff,
- 0x7fffffff,
- 0xffffffff
- };
+ int return_value;
+
+ /* Permitting uppercase letters is probably a bad idea.
+ Please use only lower-cased letters in case the upper-cased
+ ones become unsupported! */
+ switch (letter)
+ {
+ case 'f':
+ case 'F':
+ return_value = 4;
+ break;
+
+ case 'd':
+ case 'D':
+ case 'g':
+ case 'G':
+ return_value = 8;
+ break;
+
+ case 'h':
+ case 'H':
+ return_value = 16;
+ break;
+
+ default:
+ return_value = 0;
+ break;
+ }
+
+ return return_value;
+}
+
+static const long mask[] =
+{
+ 0x00000000,
+ 0x00000001,
+ 0x00000003,
+ 0x00000007,
+ 0x0000000f,
+ 0x0000001f,
+ 0x0000003f,
+ 0x0000007f,
+ 0x000000ff,
+ 0x000001ff,
+ 0x000003ff,
+ 0x000007ff,
+ 0x00000fff,
+ 0x00001fff,
+ 0x00003fff,
+ 0x00007fff,
+ 0x0000ffff,
+ 0x0001ffff,
+ 0x0003ffff,
+ 0x0007ffff,
+ 0x000fffff,
+ 0x001fffff,
+ 0x003fffff,
+ 0x007fffff,
+ 0x00ffffff,
+ 0x01ffffff,
+ 0x03ffffff,
+ 0x07ffffff,
+ 0x0fffffff,
+ 0x1fffffff,
+ 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;
+/* 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
- next_bits (number_of_bits)
-int number_of_bits;
+next_bits (int number_of_bits)
{
- int return_value;
-
- if(littlenum_pointer<littlenum_end)
- return 0;
- if (number_of_bits >= bits_left_in_littlenum)
- {
- 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];
- }
- else
- {
- bits_left_in_littlenum -= number_of_bits;
- return_value = mask [number_of_bits] & ( (* littlenum_pointer) >> bits_left_in_littlenum);
- }
- return (return_value);
+ int return_value;
+
+ if (littlenum_pointer < littlenum_end)
+ return 0;
+ if (number_of_bits >= bits_left_in_littlenum)
+ {
+ 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];
+ }
+ else
+ {
+ bits_left_in_littlenum -= number_of_bits;
+ 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;
+make_invalid_floating_point_number (LITTLENUM_TYPE *words)
{
- * words = 0x8000; /* Floating Reserved Operand Code */
+ *words = 0x8000; /* Floating Reserved Operand Code. */
}
+
\f
-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. */
+static int /* 0 means letter is OK. */
+what_kind_of_float (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. */
-
- retval = 0;
- switch (letter)
- {
- case 'f':
- * precisionP = F_PRECISION;
- * exponent_bitsP = 8;
- break;
-
- case 'd':
- * precisionP = D_PRECISION;
- * exponent_bitsP = 8;
- break;
-
- case 'g':
- * precisionP = G_PRECISION;
- * exponent_bitsP = 11;
- break;
-
- case 'h':
- * precisionP = H_PRECISION;
- * exponent_bitsP = 15;
- break;
-
- default:
- retval = 69;
- break;
- }
- return (retval);
+ int retval;
+
+ retval = 0;
+ switch (letter)
+ {
+ case 'f':
+ *precisionP = F_PRECISION;
+ *exponent_bitsP = 8;
+ break;
+
+ case 'd':
+ *precisionP = D_PRECISION;
+ *exponent_bitsP = 8;
+ break;
+
+ case 'g':
+ *precisionP = G_PRECISION;
+ *exponent_bitsP = 11;
+ break;
+
+ case 'h':
+ *precisionP = H_PRECISION;
+ *exponent_bitsP = 15;
+ break;
+
+ default:
+ retval = 69;
+ break;
+ }
+ return retval;
}
\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. */
- 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. */
+/* 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 *
+atof_vax (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;
-
- return_value = str;
- f . low = bits + MAX_PRECISION;
- f . high = NULL;
- f . leader = NULL;
- f . exponent = NULL;
- f . sign = '\0';
-
- if (what_kind_of_float (what_kind, & precision, & exponent_bits))
- {
- return_value = NULL; /* We lost. */
- make_invalid_floating_point_number (words);
- }
- if (return_value)
- {
- bzero (bits, 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;
-
- 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))
- {
- return_value = NULL;
- }
- }
- }
- return (return_value);
+ 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 = 0;
+ f.sign = '\0';
+
+ if (what_kind_of_float (what_kind, &precision, &exponent_bits))
+ {
+ return_value = NULL;
+ make_invalid_floating_point_number (words);
+ }
+
+ if (return_value)
+ {
+ 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;
+
+ if (atof_generic (&return_value, ".", "eE", &f))
+ {
+ make_invalid_floating_point_number (words);
+ return_value = NULL;
+ }
+ else if (flonum_gen2vax (what_kind, &f, words))
+ return_value = NULL;
+ }
+
+ return return_value;
}
\f
-/*
- * In: a flonum, a vax floating point format.
- * Out: a vax floating-point bit pattern.
- */
-
-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. */
+/* In: a flonum, a vax floating point format.
+ Out: a vax floating-point bit pattern. */
+
+int
+flonum_gen2vax (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. */
-
- return_value = what_kind_of_float (format_letter, & precision, & exponent_bits);
- if (return_value != 0)
+ LITTLENUM_TYPE *lp;
+ int precision;
+ long exponent_bits;
+ int return_value; /* 0 == OK. */
+
+ 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)
+ /* 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);
+ make_invalid_floating_point_number (words);
+ return return_value;
}
- else
- {
- if (f -> low > f -> leader)
- {
- /* 0.0e0 seen. */
- bzero (words, 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;
- }
- /*
- * 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.
- */
- {
- LITTLENUM_TYPE * ltp;
- for (ltp = f -> leader + 1;
- ltp <= f -> low + precision;
- ltp ++)
- {
- * ltp = 0;
- }
- }
-#endif
-
- bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
- 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. */
- exponent_2 = exponent_1 * LITTLENUM_NUMBER_OF_BITS;
- /* Radix 2. */
- exponent_3 = exponent_2 - exponent_skippage;
- /* Forget leading zeros, forget 1st bit. */
- exponent_4 = exponent_3 + (1 << (exponent_bits - 1));
- /* Offset exponent. */
-
- if (exponent_4 & ~ mask [exponent_bits])
- {
- /*
- * 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.
- */
- }
- 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. */
- for (; lp < words + precision; lp++)
- {
- * 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;
-
- /*
- #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 --)
- {
- carry = * lp + carry;
- * lp = carry;
- carry >>= LITTLENUM_NUMBER_OF_BITS;
- }
-
- 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.
- */
- }
- } /* if (we needed to round up) */
- } /* if (exponent overflow) */
- } /* if (0.0e0) */
- } /* if (float_type was OK) */
- 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.
-/* 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
- * number.
- * 1 letter denoting the type of statement that wants a
- * binary floating point number returned.
- * Address of where to build floating point literal.
- * 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 "".
- * Floating point literal.
- * Number of chars we used for the literal.
- */
-
-#define MAXIMUM_NUMBER_OF_LITTLENUMS (8) /* For .hfloats. */
-
-char *
- md_atof (what_statement_type, literalP, sizeP)
-char 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;
-
- switch (what_statement_type)
- {
- case 'F': /* .float */
- case 'f': /* .ffloat */
- kind_of_float = 'f';
- break;
-
- case 'D': /* .double */
- case 'd': /* .dfloat */
- kind_of_float = 'd';
- break;
-
- case 'g': /* .gfloat */
- kind_of_float = 'g';
- break;
-
- case 'h': /* .hfloat */
- kind_of_float = 'h';
- break;
-
- default:
- kind_of_float = 0;
- break;
- };
-
- if (kind_of_float)
+ 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. */
+
+ bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
+ 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. */
+ exponent_2 = exponent_1 * LITTLENUM_NUMBER_OF_BITS;
+ /* Radix 2. */
+ exponent_3 = exponent_2 - exponent_skippage;
+ /* Forget leading zeros, forget 1st bit. */
+ exponent_4 = exponent_3 + (1 << (exponent_bits - 1));
+ /* Offset exponent. */
+
+ if (exponent_4 & ~mask[exponent_bits])
{
- register LITTLENUM_TYPE * limit;
-
- input_line_pointer = atof_vax (input_line_pointer,
- kind_of_float,
- words);
- /*
- * The atof_vax() builds up 16-bit numbers.
- * Since the assembler may not be running on
- * a little-endian machine, be very careful about
- * 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 ++)
- {
- md_number_to_chars (literalP, * littlenum_pointer, sizeof(LITTLENUM_TYPE));
- literalP += sizeof(LITTLENUM_TYPE);
- };
+ /* 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. */
}
- else
+ else
{
- number_of_chars = 0;
- };
-
- * sizeP = number_of_chars;
- return (kind_of_float ? "" : "Bad call to md_atof()");
-} /* md_atof() */
-
-/* end of atof-vax.c */
+ 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. */
+ for (; lp < words + precision; lp++)
+ *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;
+
+ /*
+ #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--)
+ {
+ carry = *lp + carry;
+ *lp = carry;
+ carry >>= LITTLENUM_NUMBER_OF_BITS;
+ }
+
+ 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. */
+ }
+ }
+ }
+ }
+ }
+ return return_value;
+}
+
+/* JF this used to be in vax.c but this looks like a better place for it. */
+
+/* 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.
+ Address of where to build floating point literal.
+ 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 0.
+ Floating point literal.
+ Number of chars we used for the literal. */
+
+#define MAXIMUM_NUMBER_OF_LITTLENUMS 8 /* For .hfloats. */
+
+const char *
+vax_md_atof (int what_statement_type,
+ char *literalP,
+ int *sizeP)
+{
+ LITTLENUM_TYPE words[MAXIMUM_NUMBER_OF_LITTLENUMS];
+ char kind_of_float;
+ unsigned int number_of_chars;
+ LITTLENUM_TYPE *littlenumP;
+
+ switch (what_statement_type)
+ {
+ case 'F':
+ case 'f':
+ kind_of_float = 'f';
+ break;
+
+ case 'D':
+ case 'd':
+ kind_of_float = 'd';
+ break;
+
+ case 'g':
+ kind_of_float = 'g';
+ break;
+
+ case 'h':
+ kind_of_float = 'h';
+ break;
+
+ default:
+ kind_of_float = 0;
+ break;
+ };
+
+ if (kind_of_float)
+ {
+ LITTLENUM_TYPE *limit;
+
+ input_line_pointer = atof_vax (input_line_pointer,
+ kind_of_float,
+ words);
+ /* The atof_vax() builds up 16-bit numbers.
+ Since the assembler may not be running on
+ a little-endian machine, be very careful about
+ 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 (littlenumP = words; littlenumP < limit; littlenumP++)
+ {
+ 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 ? NULL : _("Unrecognized or unsupported floating point constant");
+}
projects / thirdparty / binutils-gdb.git / blobdiff