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authorKazu Hirata <kazu@codesourcery.com>2000-08-07 19:54:34 +0000
committerKazu Hirata <kazu@codesourcery.com>2000-08-07 19:54:34 +0000
commit2d484c7fa2a3742c776b0e027f931293af74b8ac (patch)
tree4afa7c557b048dd40767dd563dc18f4ab7f76011 /gas/config/atof-ieee.c
parentdce618356b28210f9047192b80af4e7851834a80 (diff)
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2000-08-05 Kazu Hirata <kazu@hxi.com>
* config/atof-ieee.c: Fix formatting. * config/atof-tahoe.c: Likewise.
Diffstat (limited to 'gas/config/atof-ieee.c')
-rw-r--r--gas/config/atof-ieee.c205
1 files changed, 104 insertions, 101 deletions
diff --git a/gas/config/atof-ieee.c b/gas/config/atof-ieee.c
index 2e3c0dc..2a916cd 100644
--- a/gas/config/atof-ieee.c
+++ b/gas/config/atof-ieee.c
@@ -29,7 +29,7 @@ static void unget_bits PARAMS ((int));
static void make_invalid_floating_point_number PARAMS ((LITTLENUM_TYPE *));
extern const char EXP_CHARS[];
-/* Precision in LittleNums. */
+/* Precision in LittleNums. */
/* Don't count the gap in the m68k extended precision format. */
#define MAX_PRECISION (5)
#define F_PRECISION (2)
@@ -37,7 +37,7 @@ extern const char EXP_CHARS[];
#define X_PRECISION (5)
#define P_PRECISION (5)
-/* Length in LittleNums of guard bits. */
+/* Length in LittleNums of guard bits. */
#define GUARD (2)
static const unsigned long mask[] =
@@ -77,7 +77,6 @@ static const unsigned long mask[] =
0xffffffff,
};
-
static int bits_left_in_littlenum;
static int littlenums_left;
static LITTLENUM_TYPE *littlenum_pointer;
@@ -100,18 +99,22 @@ next_bits (number_of_bits)
{
bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS - number_of_bits;
--littlenum_pointer;
- return_value |= (*littlenum_pointer >> bits_left_in_littlenum) & mask[number_of_bits];
+ 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_value =
+ mask[number_of_bits] & (*littlenum_pointer >> bits_left_in_littlenum);
}
- return (return_value);
+ return return_value;
}
-/* Num had better be less than LITTLENUM_NUMBER_OF_BITS */
+/* Num had better be less than LITTLENUM_NUMBER_OF_BITS. */
+
static void
unget_bits (num)
int num;
@@ -124,7 +127,8 @@ unget_bits (num)
}
else if (bits_left_in_littlenum + num > LITTLENUM_NUMBER_OF_BITS)
{
- bits_left_in_littlenum = num - (LITTLENUM_NUMBER_OF_BITS - bits_left_in_littlenum);
+ bits_left_in_littlenum =
+ num - (LITTLENUM_NUMBER_OF_BITS - bits_left_in_littlenum);
++littlenum_pointer;
++littlenums_left;
}
@@ -137,7 +141,8 @@ make_invalid_floating_point_number (words)
LITTLENUM_TYPE *words;
{
as_bad (_("cannot create floating-point number"));
- words[0] = (LITTLENUM_TYPE) ((unsigned) -1) >> 1; /* Zero the leftmost bit */
+ /* Zero the leftmost bit. */
+ words[0] = (LITTLENUM_TYPE) ((unsigned) -1) >> 1;
words[1] = (LITTLENUM_TYPE) -1;
words[2] = (LITTLENUM_TYPE) -1;
words[3] = (LITTLENUM_TYPE) -1;
@@ -145,29 +150,27 @@ make_invalid_floating_point_number (words)
words[5] = (LITTLENUM_TYPE) -1;
}
-/************************************************************************\
- * Warning: this returns 16-bit LITTLENUMs. 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! *
- * *
-\************************************************************************/
+/* Warning: This returns 16-bit LITTLENUMs. 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! */
/* Note that atof-ieee always has X and P precisions enabled. it is up
to md_atof to filter them out if the target machine does not support
them. */
-/* Returns pointer past text consumed. */
+/* Returns pointer past text consumed. */
+
char *
atof_ieee (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. */
+ char *str; /* Text to convert to binary. */
+ int what_kind; /* 'd', 'f', 'g', 'h'. */
+ LITTLENUM_TYPE *words; /* Build the binary here. */
{
- /* 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. */
static LITTLENUM_TYPE bits[MAX_PRECISION + MAX_PRECISION + GUARD];
char *return_value;
- /* Number of 16-bit words in the format. */
+ /* Number of 16-bit words in the format. */
int precision;
long exponent_bits;
FLONUM_TYPE save_gen_flonum;
@@ -186,7 +189,7 @@ atof_ieee (str, what_kind, words)
generic_floating_point_number.sign = '\0';
/* Use more LittleNums than seems necessary: the highest flonum may
- have 15 leading 0 bits, so could be useless. */
+ have 15 leading 0 bits, so could be useless. */
memset (bits, '\0', sizeof (LITTLENUM_TYPE) * MAX_PRECISION);
@@ -247,6 +250,7 @@ atof_ieee (str, what_kind, words)
}
/* Turn generic_floating_point_number into a real float/double/extended. */
+
int
gen_to_words (words, precision, exponent_bits)
LITTLENUM_TYPE *words;
@@ -274,17 +278,17 @@ gen_to_words (words, precision, exponent_bits)
if (generic_floating_point_number.low > generic_floating_point_number.leader)
{
- /* 0.0e0 seen. */
+ /* 0.0e0 seen. */
if (generic_floating_point_number.sign == '+')
words[0] = 0x0000;
else
words[0] = 0x8000;
memset (&words[1], '\0',
(words_end - words - 1) * sizeof (LITTLENUM_TYPE));
- return (return_value);
+ return return_value;
}
- /* NaN: Do the right thing */
+ /* NaN: Do the right thing. */
if (generic_floating_point_number.sign == 0)
{
if (precision == F_PRECISION)
@@ -301,17 +305,17 @@ gen_to_words (words, precision, exponent_bits)
words[3] = 0xffff;
words[4] = 0xffff;
words[5] = 0xffff;
-#else /* ! TC_M68K */
+#else /* ! TC_M68K */
#ifdef TC_I386
words[0] = 0xffff;
words[1] = 0xc000;
words[2] = 0;
words[3] = 0;
words[4] = 0;
-#else /* ! TC_I386 */
+#else /* ! TC_I386 */
abort ();
-#endif /* ! TC_I386 */
-#endif /* ! TC_M68K */
+#endif /* ! TC_I386 */
+#endif /* ! TC_M68K */
}
else
{
@@ -324,7 +328,7 @@ gen_to_words (words, precision, exponent_bits)
}
else if (generic_floating_point_number.sign == 'P')
{
- /* +INF: Do the right thing */
+ /* +INF: Do the right thing. */
if (precision == F_PRECISION)
{
words[0] = 0x7f80;
@@ -339,17 +343,17 @@ gen_to_words (words, precision, exponent_bits)
words[3] = 0;
words[4] = 0;
words[5] = 0;
-#else /* ! TC_M68K */
+#else /* ! TC_M68K */
#ifdef TC_I386
words[0] = 0x7fff;
words[1] = 0x8000;
words[2] = 0;
words[3] = 0;
words[4] = 0;
-#else /* ! TC_I386 */
+#else /* ! TC_I386 */
abort ();
-#endif /* ! TC_I386 */
-#endif /* ! TC_M68K */
+#endif /* ! TC_I386 */
+#endif /* ! TC_M68K */
}
else
{
@@ -358,11 +362,11 @@ gen_to_words (words, precision, exponent_bits)
words[2] = 0;
words[3] = 0;
}
- return (return_value);
+ return return_value;
}
else if (generic_floating_point_number.sign == 'N')
{
- /* Negative INF */
+ /* Negative INF. */
if (precision == F_PRECISION)
{
words[0] = 0xff80;
@@ -377,17 +381,17 @@ gen_to_words (words, precision, exponent_bits)
words[3] = 0;
words[4] = 0;
words[5] = 0;
-#else /* ! TC_M68K */
+#else /* ! TC_M68K */
#ifdef TC_I386
words[0] = 0xffff;
words[1] = 0x8000;
words[2] = 0;
words[3] = 0;
words[4] = 0;
-#else /* ! TC_I386 */
+#else /* ! TC_I386 */
abort ();
-#endif /* ! TC_I386 */
-#endif /* ! TC_M68K */
+#endif /* ! TC_I386 */
+#endif /* ! TC_M68K */
}
else
{
@@ -396,46 +400,49 @@ gen_to_words (words, precision, exponent_bits)
words[2] = 0x0;
words[3] = 0x0;
}
- return (return_value);
+ return return_value;
}
- /*
- * The floating point formats we support 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(s) are the next most significant bits.
- *
- * So we need: number of bits of exponent, number of bits of
- * mantissa.
- */
+
+ /* The floating point formats we support 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(s) are the next most significant bits.
+
+ So we need: number of bits of exponent, number of bits of
+ mantissa. */
bits_left_in_littlenum = LITTLENUM_NUMBER_OF_BITS;
littlenum_pointer = generic_floating_point_number.leader;
littlenums_left = (1
+ generic_floating_point_number.leader
- generic_floating_point_number.low);
- /* Seek (and forget) 1st significant bit */
+
+ /* Seek (and forget) 1st significant bit. */
for (exponent_skippage = 0; !next_bits (1); ++exponent_skippage);;
exponent_1 = (generic_floating_point_number.exponent
+ generic_floating_point_number.leader
+ 1
- generic_floating_point_number.low);
+
/* Radix LITTLENUM_RADIX, point just higher than
- generic_floating_point_number.leader. */
+ generic_floating_point_number.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)) - 2);
- /* Offset exponent. */
+ /* Offset exponent. */
lp = words;
- /* Word 1. Sign, exponent and perhaps high bits. */
+ /* Word 1. Sign, exponent and perhaps high bits. */
word1 = ((generic_floating_point_number.sign == '+')
? 0
: (1 << (LITTLENUM_NUMBER_OF_BITS - 1)));
- /* Assume 2's complement integers. */
+ /* Assume 2's complement integers. */
if (exponent_4 <= 0)
{
int prec_bits;
@@ -443,7 +450,8 @@ gen_to_words (words, precision, exponent_bits)
unget_bits (1);
num_bits = -exponent_4;
- prec_bits = LITTLENUM_NUMBER_OF_BITS * precision - (exponent_bits + 1 + num_bits);
+ prec_bits =
+ LITTLENUM_NUMBER_OF_BITS * precision - (exponent_bits + 1 + num_bits);
#ifdef TC_I386
if (precision == X_PRECISION && exponent_bits == 15)
{
@@ -457,14 +465,15 @@ gen_to_words (words, precision, exponent_bits)
if (num_bits >= LITTLENUM_NUMBER_OF_BITS - exponent_bits)
{
- /* Bigger than one littlenum */
+ /* Bigger than one littlenum. */
num_bits -= (LITTLENUM_NUMBER_OF_BITS - 1) - exponent_bits;
*lp++ = word1;
- if (num_bits + exponent_bits + 1 > precision * LITTLENUM_NUMBER_OF_BITS)
+ if (num_bits + exponent_bits + 1
+ > precision * LITTLENUM_NUMBER_OF_BITS)
{
- /* Exponent overflow */
+ /* Exponent overflow. */
make_invalid_floating_point_number (words);
- return (return_value);
+ return return_value;
}
#ifdef TC_M68K
if (precision == X_PRECISION && exponent_bits == 15)
@@ -490,14 +499,15 @@ gen_to_words (words, precision, exponent_bits)
}
else
{
- word1 |= next_bits ((LITTLENUM_NUMBER_OF_BITS - 1) - (exponent_bits + num_bits));
+ word1 |= next_bits ((LITTLENUM_NUMBER_OF_BITS - 1)
+ - (exponent_bits + num_bits));
*lp++ = word1;
}
}
while (lp < words_end)
*lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS);
- /* Round the mantissa up, but don't change the number */
+ /* Round the mantissa up, but don't change the number. */
if (next_bits (1))
{
--lp;
@@ -570,15 +580,11 @@ gen_to_words (words, precision, exponent_bits)
}
else if ((unsigned long) exponent_4 >= mask[exponent_bits])
{
- /*
- * Exponent overflow. Lose immediately.
- */
-
- /*
- * We leave return_value alone: admit we read the
- * number, but return a floating exception
- * because we can't encode the number.
- */
+ /* Exponent overflow. Lose immediately. */
+
+ /* We leave return_value alone: admit we read the
+ number, but return a floating exception
+ because we can't encode the number. */
make_invalid_floating_point_number (words);
return return_value;
}
@@ -591,7 +597,7 @@ gen_to_words (words, precision, exponent_bits)
*lp++ = word1;
/* X_PRECISION is special: on the 68k, it has 16 bits of zero in the
- middle. Either way, it is then followed by a 1 bit. */
+ middle. Either way, it is then followed by a 1 bit. */
if (exponent_bits == 15 && precision == X_PRECISION)
{
#ifdef TC_M68K
@@ -601,21 +607,19 @@ gen_to_words (words, precision, exponent_bits)
| next_bits (LITTLENUM_NUMBER_OF_BITS - 1));
}
- /* The rest of the words are just mantissa bits. */
+ /* The rest of the words are just mantissa bits. */
while (lp < words_end)
*lp++ = next_bits (LITTLENUM_NUMBER_OF_BITS);
if (next_bits (1))
{
unsigned long carry;
- /*
- * 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? */
/* #if (sizeof(carry)) < ((sizeof(bits[0]) * BITS_PER_CHAR) + 2)
Please allow at least 1 more bit in carry than is in a LITTLENUM.
@@ -640,33 +644,36 @@ gen_to_words (words, precision, exponent_bits)
{
#ifdef TC_M68K
/* On the m68k there is a gap of 16 bits. We must
- explicitly propagate the carry into the exponent. */
+ explicitly propagate the carry into the exponent. */
words[0] += words[1];
words[1] = 0;
lp++;
#endif
- /* Put back the integer bit. */
+ /* Put back the integer bit. */
lp[1] |= 1 << (LITTLENUM_NUMBER_OF_BITS - 1);
}
- }
+ }
if ((word1 ^ *words) & (1 << (LITTLENUM_NUMBER_OF_BITS - 1)))
{
- /* 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. */
*words &= ~(1 << (LITTLENUM_NUMBER_OF_BITS - 1));
- /* make_invalid_floating_point_number (words); */
- /* return return_value; */
+#if 0
+ make_invalid_floating_point_number (words);
+ return return_value;
+#endif
}
}
- return (return_value);
+ return return_value;
}
-#if 0 /* unused */
+#if 0
+/* Unused. */
/* This routine is a real kludge. Someone really should do it better,
but I'm too lazy, and I don't understand this stuff all too well
anyway. (JF) */
+
static void
int_to_gen (x)
long x;
@@ -705,13 +712,9 @@ print_gen (gen)
sprintf (sbuf + strlen (sbuf), "%x %x %.12g\n", arr[0], arr[1], fv);
if (gen)
- {
- generic_floating_point_number = f;
- }
+ generic_floating_point_number = f;
return (sbuf);
}
#endif
-
-/* end of atof-ieee.c */