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#5797 probably still wrong wrt underflow.

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Nikolaj Bjorner 2022-01-27 12:48:15 -08:00
parent 9e5b6e0c9c
commit 5e81c1220c
1 changed files with 1 additions and 1 deletions
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src/ast/rewriter/bv_rewriter.cpp
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@ -2829,7 +2829,7 @@ br_status bv_rewriter::mk_bvsmul_no_overflow(unsigned num, expr * const * args,
bool sign1 = m_util.has_sign_bit(a1_val, bv_sz);
if (sign0) a0_val = rational::power_of_two(bv_sz) - a0_val;
if (sign1) a1_val = rational::power_of_two(bv_sz) - a1_val;
rational lim = rational::power_of_two(bv_sz);
rational lim = rational::power_of_two(bv_sz-1);
rational r = a0_val * a1_val;
result = m().mk_bool_val((sign0 != sign1) || r < lim);
return BR_DONE;