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Clarify bit-blasting of fp.neg. Fixes #4466.

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This commit is contained in:
Christoph M. Wintersteiger 2020-07-08 18:24:08 +00:00
parent c59519bf9c
commit 3776588375
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GPG key ID: BCF6360F86294467
1 changed files with 9 additions and 8 deletions
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17
src/ast/fpa/fpa2bv_converter.cpp
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@ -50,11 +50,13 @@ fpa2bv_converter::~fpa2bv_converter() {
void fpa2bv_converter::mk_eq(expr * a, expr * b, expr_ref & result) {
if (is_float(a) && is_float(b)) {
SASSERT(m_util.is_fp(a) && m_util.is_fp(b));
TRACE("fpa2bv", tout << "mk_eq a=" << mk_ismt2_pp(a, m) << std::endl;
tout << "mk_eq b=" << mk_ismt2_pp(b, m) << std::endl;);
SASSERT(m_util.is_fp(a) && m_util.is_fp(b));
expr_ref eq_sgn(m), eq_exp(m), eq_sig(m);
m_simp.mk_eq(to_app(a)->get_arg(0), to_app(b)->get_arg(0), eq_sgn);
m_simp.mk_eq(to_app(a)->get_arg(1), to_app(b)->get_arg(1), eq_exp);
@ -698,14 +700,13 @@ void fpa2bv_converter::mk_neg(func_decl * f, unsigned num, expr * const * args,
}
void fpa2bv_converter::mk_neg(sort * srt, expr_ref & x, expr_ref & result) {
expr_ref sgn(m), sig(m), e(m);
split_fp(x, sgn, e, sig);
expr_ref c(m), nsgn(m);
mk_is_nan(x, c);
expr_ref sgn(m), sig(m), exp(m);
split_fp(x, sgn, exp, sig);
expr_ref x_is_nan(m), nsgn(m), nx(m);
mk_is_nan(x, x_is_nan);
nsgn = m_bv_util.mk_bv_not(sgn);
expr_ref r_sgn(m);
m_simp.mk_ite(c, sgn, nsgn, r_sgn);
result = m_util.mk_fp(r_sgn, e, sig);
nx = m_util.mk_fp(nsgn, exp, sig);
mk_ite(x_is_nan, x, nx, result);
}
void fpa2bv_converter::mk_mul(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {