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fixed bug of computing butlast of a sequence (#5602)

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Margus Veanes 2021-10-15 18:02:51 -07:00 committed by GitHub
parent fb9fa1b7d2
commit f78546cd7c
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1 changed files with 4 additions and 3 deletions
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7
src/ast/rewriter/seq_rewriter.cpp
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@ -936,13 +936,14 @@ expr_ref seq_rewriter::mk_seq_last(expr* t) {
}
/*
* In general constructs substring(t,0,|t|-1) but if t = substring(s,j,k) then simplifies to substring(s,j,k-1)
* This method assumes that |t| > 0 holds.
* In general constructs substring(t,0,|t|-1) but if t = substring(s,0,k) then simplifies to substring(s,0,k-1)
* This method assumes that |t| > 0, thus, if t = substring(s,0,k) then k > 0 so substring(s,0,k-1) is correct.
*/
expr_ref seq_rewriter::mk_seq_butlast(expr* t) {
expr_ref result(m());
expr* s, * j, * k;
if (str().is_extract(t, s, j, k)) {
rational v;
if (str().is_extract(t, s, j, k) && m_autil.is_numeral(j, v) && v.is_zero()) {
expr_ref_vector k_min_1(m());
k_min_1.push_back(k);
k_min_1.push_back(minus_one());