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allow parameters to overwrite logic, fixes bug report by Nuno

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-03-07 10:44:06 -08:00
parent 8c4d791f01
commit 49d0e28621
3 changed files with 12 additions and 9 deletions
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8
src/util/mpn.cpp
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@ -226,7 +226,7 @@ size_t mpn_manager::div_normalize(mpn_digit const * numer, size_t const lnum,
mpn_sbuffer & n_denom) const
{
size_t d = 0;
while (((denom[lden-1] << d) & MASK_FIRST) == 0) d++;
while (lden > 0 && ((denom[lden-1] << d) & MASK_FIRST) == 0) d++;
SASSERT(d < DIGIT_BITS);
n_numer.resize(lnum+1);
@ -239,7 +239,8 @@ size_t mpn_manager::div_normalize(mpn_digit const * numer, size_t const lnum,
for (size_t i = 0; i < lden; i++)
n_denom[i] = denom[i];
}
else {
else if (lnum != 0) {
SASSERT(lden > 0);
mpn_digit q = FIRST_BITS(d, numer[lnum-1]);
n_numer[lnum] = q;
for (size_t i = lnum-1; i > 0; i--)
@ -249,6 +250,9 @@ size_t mpn_manager::div_normalize(mpn_digit const * numer, size_t const lnum,
n_denom[i] = denom[i] << d | FIRST_BITS(d, denom[i-1]);
n_denom[0] = denom[0] << d;
}
else {
d = 0;
}
TRACE("mpn_norm", tout << "Normalized: n_numer="; display_raw(tout, n_numer.c_ptr(), n_numer.size());
tout << " n_denom="; display_raw(tout, n_denom.c_ptr(), n_denom.size()); tout << std::endl; );