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fix #7460

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This commit is contained in:
Nikolaj Bjorner 2024-12-21 14:42:23 +01:00
parent 2044fb460d
commit 578804acf4
1 changed files with 15 additions and 0 deletions
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15
src/ast/rewriter/bv_rewriter.cpp
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@ -1055,6 +1055,21 @@ br_status bv_rewriter::mk_bv_ashr(expr * arg1, expr * arg2, expr_ref & result) {
return BR_REWRITE1; // not really needed at this time.
}
verbose_stream() << "ashr : " << mk_pp(arg1, m) << " " << mk_pp(arg2, m) << "\n";
if (num_leading_zero_bits(arg1) > 0 && is_num2) {
SASSERT(r2 > 0);
if (r2 >= bv_size) {
result = mk_zero(bv_size);
return BR_DONE;
}
SASSERT(r2.is_unsigned());
// (bvlshr x k) -> (concat bv0:k (extract [n-1:k] x))
unsigned k = r2.get_unsigned();
result = m_util.mk_concat(mk_zero(k), m_mk_extract(bv_size - 1, k, arg1));
return BR_REWRITE2;
}
#if 0
// (bvashr x k) --> (concat extract[sz-1:sz-1](x) ... extract[sz-1:sz-1](x) extract[sz-1:k](x))
if (is_num2) {