X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Fconfig%2Fatof-vax.c;h=8ca80b0ef8f6fff843174580b0b679f0153cae7f;hb=c1f61bd2b0644fc710dcfbb378a63f0b34be8903;hp=45b90a8cc241325fbee2b4f1b8436c03b67f576d;hpb=dc9e099fc0eced486ae2b49455c9da113c11f4ff;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/config/atof-vax.c b/gas/config/atof-vax.c index 45b90a8cc2..8ca80b0ef8 100644 --- a/gas/config/atof-vax.c +++ b/gas/config/atof-vax.c @@ -1,11 +1,11 @@ /* atof_vax.c - turn a Flonum into a VAX floating point number - Copyright (C) 1987, 1992, 93, 95, 1997, 1998 Free Software Foundation, Inc. + Copyright (C) 1987-2016 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, @@ -15,42 +15,33 @@ 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': @@ -74,8 +65,9 @@ atof_vax_sizeof (letter) return_value = 0; break; } - return (return_value); -} /* atof_vax_sizeof */ + + return return_value; +} static const long mask[] = { @@ -115,14 +107,13 @@ static const long mask[] = }; -/* 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; @@ -143,23 +134,22 @@ next_bits (number_of_bits) 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. */ } + -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) @@ -188,31 +178,26 @@ what_kind_of_float (letter, precisionP, exponent_bitsP) retval = 69; break; } - return (retval); + 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! * - * * - \***********************************************************************/ - -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; @@ -224,7 +209,7 @@ atof_vax (str, what_kind, words) if (what_kind_of_float (what_kind, &precision, &exponent_bits)) { - return_value = NULL; /* We lost. */ + return_value = NULL; make_invalid_floating_point_number (words); } @@ -232,56 +217,47 @@ atof_vax (str, what_kind, 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; +} -/* - * 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. */ + 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; @@ -291,115 +267,86 @@ flonum_gen2vax (format_letter, f, words) 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--) @@ -412,69 +359,61 @@ flonum_gen2vax (format_letter, f, words) 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; @@ -485,17 +424,15 @@ md_atof (what_statement_type, literalP, sizeP) 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)); @@ -506,12 +443,8 @@ md_atof (what_statement_type, literalP, sizeP) }; } else - { - number_of_chars = 0; - }; + number_of_chars = 0; *sizeP = number_of_chars; - return kind_of_float ? 0 : _("Bad call to md_atof()"); + return kind_of_float ? NULL : _("Unrecognized or unsupported floating point constant"); } - -/* end of atof-vax.c */