diff options
| author | Andreas Schwab <schwab@linux-m68k.org> | 1999-05-14 01:53:28 +0000 |
|---|---|---|
| committer | Andreas Schwab <schwab@linux-m68k.org> | 1999-05-14 01:53:28 +0000 |
| commit | 19b341776db9a4a7740943fb2da7ae209fd492dd (patch) | |
| tree | 05de49c5c3c1c07b57727d629aeefb69f8f9d995 /gas | |
| parent | de24ad21069c5466d13b06963b1797241392cebd (diff) | |
| download | gdb-19b341776db9a4a7740943fb2da7ae209fd492dd.zip gdb-19b341776db9a4a7740943fb2da7ae209fd492dd.tar.gz gdb-19b341776db9a4a7740943fb2da7ae209fd492dd.tar.bz2 | |
* config/atof-ieee.c (gen_to_words): Correctly round a
denormalized number. Fix off-by-one in range checking for
exponent in a denormal.
Diffstat (limited to 'gas')
| -rw-r--r-- | gas/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/config/atof-ieee.c | 27 |
2 files changed, 29 insertions, 4 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 7e62bdc..0e7b0e8 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,9 @@ +Fri May 14 10:52:13 1999 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> + + * config/atof-ieee.c (gen_to_words): Correctly round a + denormalized number. Fix off-by-one in range checking for + exponent in a denormal. + Thu May 13 09:46:59 1999 Joel Sherrill (joel@OARcorp.com) * configure.in (i386-*-rtemself*, sh-*-rtemself*): New targets. diff --git a/gas/config/atof-ieee.c b/gas/config/atof-ieee.c index d586e3a..fbf0ffb 100644 --- a/gas/config/atof-ieee.c +++ b/gas/config/atof-ieee.c @@ -460,7 +460,7 @@ gen_to_words (words, precision, exponent_bits) /* 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 */ make_invalid_floating_point_number (words); @@ -501,7 +501,7 @@ gen_to_words (words, precision, exponent_bits) if (next_bits (1)) { --lp; - if (prec_bits > LITTLENUM_NUMBER_OF_BITS) + if (prec_bits >= LITTLENUM_NUMBER_OF_BITS) { int n = 0; int tmp_bits; @@ -515,7 +515,19 @@ gen_to_words (words, precision, exponent_bits) --n; tmp_bits -= LITTLENUM_NUMBER_OF_BITS; } - if (tmp_bits > LITTLENUM_NUMBER_OF_BITS || (lp[n] & mask[tmp_bits]) != mask[tmp_bits]) + if (tmp_bits > LITTLENUM_NUMBER_OF_BITS + || (lp[n] & mask[tmp_bits]) != mask[tmp_bits] + || (prec_bits != (precision * LITTLENUM_NUMBER_OF_BITS + - exponent_bits - 1) +#ifdef TC_I386 + /* An extended precision float with only the integer + bit set would be invalid. That must be converted + to the smallest normalized number. */ + && !(precision == X_PRECISION + && prec_bits == (precision * LITTLENUM_NUMBER_OF_BITS + - exponent_bits - 2)) +#endif + )) { unsigned long carry; @@ -539,11 +551,18 @@ gen_to_words (words, precision, exponent_bits) << ((LITTLENUM_NUMBER_OF_BITS - 1) - exponent_bits)); *lp++ = word1; +#ifdef TC_I386 + /* Set the integer bit in the extended precision format. + This cannot happen on the m68k where the mantissa + just overflows into the integer bit above. */ + if (precision == X_PRECISION) + *lp++ = 1 << (LITTLENUM_NUMBER_OF_BITS - 1); +#endif while (lp < words_end) *lp++ = 0; } } - else if ((*lp & mask[prec_bits]) != mask[prec_bits]) + else *lp += 1; } |