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fix #5789

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fix incorrect constant folding
This commit is contained in:
Nikolaj Bjorner 2022-01-24 09:42:14 +01:00
parent d02235fe08
commit 20f9814939
1 changed files with 9 additions and 8 deletions
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17
src/ast/rewriter/bv_rewriter.cpp
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@ -2818,14 +2818,15 @@ br_status bv_rewriter::mk_bvsmul_no_overflow(unsigned num, expr * const * args,
return BR_DONE;
}
if (is_num1 && is_num2) {
rational mr = a0_val * a1_val;
rational lim = rational::power_of_two(bv_sz-1);
result = m().mk_bool_val(mr < lim);
return BR_DONE;
}
return BR_FAILED;
if (!is_num1 || !is_num2)
return BR_FAILED;
rational lim = rational::power_of_two(bv_sz);
rational r = a0_val * a1_val;
bool sign1 = m_util.has_sign_bit(a0_val, bv_sz);
bool sign2 = m_util.has_sign_bit(a1_val, bv_sz);
result = m().mk_bool_val((sign1 != sign2) || r < lim);
return BR_DONE;
}
br_status bv_rewriter::mk_bvumul_no_overflow(unsigned num, expr * const * args, expr_ref & result) {