/* atof_vax.c - turn a Flonum into a VAX floating point number
- Copyright (C) 1987, 1992, 93, 95, 97, 98, 1999
- 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,
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"
-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. */
+#define MAX_PRECISION 8
+#define H_PRECISION 8
+#define G_PRECISION 4
+#define D_PRECISION 4
+#define F_PRECISION 2
-/* 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
-/* Length in LittleNums of guard bits. */
-#define GUARD (2)
+int flonum_gen2vax (int, FLONUM_TYPE *, LITTLENUM_TYPE *);
-int flonum_gen2vax PARAMS ((int format_letter, FLONUM_TYPE * f,
- LITTLENUM_TYPE * words));
+/* Number of chars in flonum type 'letter'. */
-/* Number of chars in flonum type 'letter'. */
-static int
-atof_vax_sizeof (letter)
- int 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!
- */
+ /* 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':
return_value = 0;
break;
}
- return (return_value);
-} /* atof_vax_sizeof */
+
+ return return_value;
+}
static const long mask[] =
{
};
\f
-/* Shared between flonum_gen2vax and next_bits */
+/* 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;
bits_left_in_littlenum -= number_of_bits;
return_value = mask[number_of_bits] & ((*littlenum_pointer) >> bits_left_in_littlenum);
}
- return (return_value);
+ 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)
- 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. */
+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. */
+ int retval;
retval = 0;
switch (letter)
retval = 69;
break;
}
- return (retval);
+ 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! *
- * *
- \***********************************************************************/
-
-static char * /* Return pointer past text consumed. */
-atof_vax (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. */
+/* 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. */
+ /* 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. */
+ int precision; /* Number of 16-bit words in the format. */
long exponent_bits;
return_value = str;
if (what_kind_of_float (what_kind, &precision, &exponent_bits))
{
- return_value = NULL; /* We lost. */
+ return_value = NULL;
make_invalid_floating_point_number (words);
}
{
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. */
+ /* 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_value = NULL;
}
+ else if (flonum_gen2vax (what_kind, &f, words))
+ return_value = NULL;
}
- return (return_value);
-} /* atof_vax() */
+
+ 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)
- int 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. */
+ 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);
- }
+ make_invalid_floating_point_number (words);
+
else
{
if (f->low > f->leader)
- {
- /* 0.0e0 seen. */
- memset (words, '\0', sizeof (LITTLENUM_TYPE) * precision);
- }
+ /* 0.0e0 seen. */
+ memset (words, '\0', sizeof (LITTLENUM_TYPE) * precision);
+
else
{
long exponent_1;
int exponent_skippage;
LITTLENUM_TYPE word1;
- /* JF: Deal with new Nan, +Inf and -Inf codes */
+ /* 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
+
+ /* 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. */
bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
littlenum_pointer = f->leader;
littlenum_end = f->low;
- /* Seek (and forget) 1st significant bit */
+ /* Seek (and forget) 1st significant bit. */
for (exponent_skippage = 0;
!next_bits (1);
- exponent_skippage++);;
+ exponent_skippage++);
exponent_1 = f->exponent + f->leader + 1 - f->low;
- /* Radix LITTLENUM_RADIX, point just higher than f->leader. */
+ /* 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. */
+ /* 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. */
+ /* 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. */
+ /* 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?
- */
-
+ /* 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
- */
+ #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--)
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
- * 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. */
-
-char *
-md_atof (what_statement_type, literalP, sizeP)
- int what_statement_type;
- char *literalP;
- int *sizeP;
+ }
+ }
+ }
+ }
+ 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];
- register char kind_of_float;
- register int number_of_chars;
- register LITTLENUM_TYPE *littlenumP;
+ char kind_of_float;
+ unsigned int number_of_chars;
+ LITTLENUM_TYPE *littlenumP;
switch (what_statement_type)
{
- case 'F': /* .float */
- case 'f': /* .ffloat */
+ case 'F':
+ case 'f':
kind_of_float = 'f';
break;
- case 'D': /* .double */
- case 'd': /* .dfloat */
+ case 'D':
+ case 'd':
kind_of_float = 'd';
break;
- case 'g': /* .gfloat */
+ case 'g':
kind_of_float = 'g';
break;
- case 'h': /* .hfloat */
+ case 'h':
kind_of_float = 'h';
break;
if (kind_of_float)
{
- register LITTLENUM_TYPE *limit;
+ 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.
- */
+ /* 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));
};
}
else
- {
- number_of_chars = 0;
- };
+ number_of_chars = 0;
*sizeP = number_of_chars;
- return kind_of_float ? NULL : _("Bad call to md_atof()");
+ return kind_of_float ? NULL : _("Unrecognized or unsupported floating point constant");
}
-
-/* end of atof-vax.c */
projects / thirdparty / binutils-gdb.git / blobdiff