diff options
Diffstat (limited to 'gas/config/atof-tahoe.c')
| -rw-r--r-- | gas/config/atof-tahoe.c | 431 |
1 files changed, 0 insertions, 431 deletions
diff --git a/gas/config/atof-tahoe.c b/gas/config/atof-tahoe.c deleted file mode 100644 index 760485c5fde..00000000000 --- a/gas/config/atof-tahoe.c +++ /dev/null @@ -1,431 +0,0 @@ - -/* atof_tahoe.c - turn a string into a Tahoe floating point number - Copyright (C) 1987, 1998 Free Software Foundation, Inc. - */ - -/* This is really a simplified version of atof_vax.c. I glommed it wholesale - and then shaved it down. I don't even know how it works. (Don't you find - my honesty refreshing? bowen@cs.Buffalo.EDU (Devon E Bowen) - - I don't allow uppercase letters in the precision descrpitors. Ie 'f' and - 'd' are allowed but 'F' and 'D' aren't */ - -#include "as.h" - -/* Precision in LittleNums. */ -#define MAX_PRECISION (4) -#define D_PRECISION (4) -#define F_PRECISION (2) - -/* Precision in chars. */ -#define D_PRECISION_CHARS (8) -#define F_PRECISION_CHARS (4) - -/* Length in LittleNums of guard bits. */ -#define GUARD (2) - -static const long int 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 -}; - - -/* Shared between flonum_gen2tahoe and next_bits */ -static int bits_left_in_littlenum; -static LITTLENUM_TYPE *littlenum_pointer; -static LITTLENUM_TYPE *littlenum_end; - -#if __STDC__ == 1 - -int flonum_gen2tahoe (int format_letter, FLONUM_TYPE * f, LITTLENUM_TYPE * words); - -#else /* not __STDC__ */ - -int flonum_gen2tahoe (); - -#endif /* not __STDC__ */ - - -static int -next_bits (number_of_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); -} - -static void -make_invalid_floating_point_number (words) - LITTLENUM_TYPE *words; -{ - *words = 0x8000; /* Floating Reserved Operand Code */ -} - -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 int *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; - - default: - retval = 69; - break; - } - return (retval); -} - -/***********************************************************************\ -* * -* 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_tahoe (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. */ -{ - 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 int 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) - { - 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; /* we lost */ - } - else - { - if (flonum_gen2tahoe (what_kind, &f, words)) - { - return_value = NULL; - } - } - } - return (return_value); -} - -/* - * In: a flonum, a Tahoe floating point format. - * Out: a Tahoe floating-point bit pattern. - */ - -int /* 0: OK. */ -flonum_gen2tahoe (format_letter, f, words) - char format_letter; /* One of 'd' 'f'. */ - FLONUM_TYPE *f; - LITTLENUM_TYPE *words; /* Deliver answer here. */ -{ - LITTLENUM_TYPE *lp; - int precision; - long int 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 int exponent_1; - long int exponent_2; - long int exponent_3; - long int 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 tahoe floating_point formats 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. - * - * 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]) - { - /* - * 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 int 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); -} - -/* - * 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. - */ - -char * -md_atof (what_statement_type, literalP, sizeP) - char what_statement_type; - char *literalP; - int *sizeP; -{ - LITTLENUM_TYPE words[MAX_PRECISION]; - register char kind_of_float; - register int number_of_chars; - register LITTLENUM_TYPE *littlenum_pointer; - - switch (what_statement_type) - { - case 'f': /* .ffloat */ - case 'd': /* .dfloat */ - kind_of_float = what_statement_type; - break; - - default: - kind_of_float = 0; - break; - }; - - if (kind_of_float) - { - register LITTLENUM_TYPE *limit; - - input_line_pointer = atof_tahoe (input_line_pointer, - kind_of_float, - words); - /* - * The atof_tahoe() builds up 16-bit numbers. - * Since the assembler may not be running on - * a different-endian machine, be very careful about - * converting words to chars. - */ - number_of_chars = (kind_of_float == 'f' ? F_PRECISION_CHARS : - (kind_of_float == 'd' ? D_PRECISION_CHARS : 0)); - know (number_of_chars <= MAX_PRECISION * 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); - }; - } - else - { - number_of_chars = 0; - }; - - *sizeP = number_of_chars; - return kind_of_float ? 0 : _("Bad call to md_atof()"); -} - -/* atof_tahoe.c */ |