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Fix rounding bug in to_fp (#6074)

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Christoph M. Wintersteiger 2022-06-04 14:32:08 +01:00 committed by GitHub
parent cb67f90f1a
commit 6422a6b5a7
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 4 deletions
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9
src/ast/fpa/fpa2bv_converter.cpp
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@ -2667,7 +2667,8 @@ void fpa2bv_converter::mk_to_fp_real(func_decl * f, sort * s, expr * rm, expr *
unsigned sbits = m_util.get_sbits(s); unsigned sbits = m_util.get_sbits(s);
if (m_bv_util.is_numeral(bv_rm) && m_util.au().is_numeral(x)) { if (m_bv_util.is_numeral(bv_rm) && m_util.au().is_numeral(x)) {
rational tmp_rat; unsigned sz; rational tmp_rat;
unsigned sz;
m_bv_util.is_numeral(to_expr(bv_rm), tmp_rat, sz); m_bv_util.is_numeral(to_expr(bv_rm), tmp_rat, sz);
SASSERT(tmp_rat.is_int32()); SASSERT(tmp_rat.is_int32());
SASSERT(sz == 3); SASSERT(sz == 3);
@ -2751,9 +2752,9 @@ void fpa2bv_converter::mk_to_fp_real(func_decl * f, sort * s, expr * rm, expr *
mk_bias(unbiased_exp, exp); mk_bias(unbiased_exp, exp);
v4 = m_util.mk_fp(sgn, exp, sig); v4 = m_util.mk_fp(sgn, exp, sig);
sgn = m_bv_util.mk_numeral((m_util.fm().sgn(v_tp)) ? 1 : 0, 1); sgn = m_bv_util.mk_numeral((m_util.fm().sgn(v_tz)) ? 1 : 0, 1);
sig = m_bv_util.mk_numeral(m_util.fm().sig(v_tp), sbits - 1); sig = m_bv_util.mk_numeral(m_util.fm().sig(v_tz), sbits - 1);
unbiased_exp = m_bv_util.mk_numeral(m_util.fm().exp(v_tp), ebits); unbiased_exp = m_bv_util.mk_numeral(m_util.fm().exp(v_tz), ebits);
mk_bias(unbiased_exp, exp); mk_bias(unbiased_exp, exp);
result = m_util.mk_fp(sgn, exp, sig); result = m_util.mk_fp(sgn, exp, sig);