19990502 sourceware importbinu_ss_19990502

1 files changed, 517 insertions, 0 deletions

diff --git a/gas/config/atof-vax.c b/gas/config/atof-vax.c
new file mode 100644
index 0000000..45b90a8
--- /dev/null
+++ b/gas/config/atof-vax.c
@@ -0,0 +1,517 @@
+/* atof_vax.c - turn a Flonum into a VAX floating point number
+   Copyright (C) 1987, 1992, 93, 95, 1997, 1998 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)
+   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, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, 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)
+
+/* Length in LittleNums of guard bits. */
+#define GUARD (2)
+
+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)
+     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
+};
+
+
+/* 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;
+{
+  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)
+     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);
+}
+
+/***********************************************************************\
+ *									*
+ *	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. */
+{
+  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;	/* 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_gen2vax (what_kind, &f, words))
+	    {
+	      return_value = NULL;
+	    }
+	}
+    }
+  return (return_value);
+}				/* atof_vax() */
+
+/*
+ * 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. */
+{
+  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);
+	      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);
+}				/* 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;
+{
+  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)
+    {
+    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)
+    {
+      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 (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 ? 0 : _("Bad call to md_atof()");
+}
+
+/* end of atof-vax.c */