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FPA: bug and leak fixes

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Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2014-12-14 19:09:17 +00:00
parent 4e913bb18c
commit f11ee40c38
7 changed files with 142 additions and 24 deletions
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50
src/ast/fpa/fpa2bv_converter.cpp
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@ -1870,6 +1870,12 @@ void fpa2bv_converter::mk_to_fp(func_decl * f, unsigned num, expr * const * args
// Just keep it here, as there will be something else that uses it.
mk_triple(args[0], args[1], args[2], result);
}
else if (num == 2 &&
m_bv_util.is_bv(args[0]) &&
m_bv_util.is_bv(args[1]))
{
mk_to_fp_signed(f, num, args, result);
}
else if (num == 3 &&
m_bv_util.is_bv(args[0]) &&
m_arith_util.is_numeral(args[1]) &&
@ -2143,6 +2149,50 @@ void fpa2bv_converter::mk_to_fp(func_decl * f, unsigned num, expr * const * args
SASSERT(is_well_sorted(m, result));
}
void fpa2bv_converter::mk_to_fp_signed(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
TRACE("fpa2bv_to_fp_signed", for (unsigned i = 0; i < num; i++)
tout << "arg" << i << " = " << mk_ismt2_pp(args[i], m) << std::endl;);
// This is meant to be a conversion from signed bitvector to float:
// ; from signed machine integer, represented as a 2's complement bit vector
// ((_ to_fp eb sb) RoundingMode(_ BitVec m) (_ FloatingPoint eb sb))
// Semantics:
//((_ to_fp eb sb) RoundingMode (_ BitVec m) (_ FloatingPoint eb sb)):
// Let b in[[(_ BitVec m)]] and let n be the signed integer represented by b (in 2's complement format).
// [[(_ to_fp eb sb)]](r, b) = +/ -infinity if n is too large / too small to be represented as a finite
// number of [[(_ FloatingPoint eb sb)]]; [[(_ to_fp eb sb)]](r, x) = y otherwise, where y is the finite
// number such that [[fp.to_real]](y) is closest to n according to rounding mode r.
NOT_IMPLEMENTED_YET();
SASSERT(m_util.is_float(f->get_range()));
unsigned ebits = m_util.get_ebits(f->get_range());
unsigned sbits = m_util.get_sbits(f->get_range());
unsigned sz = sbits + ebits;
SASSERT(m_bv_util.get_bv_size(args[0]) == 3);
SASSERT(m_bv_util.get_bv_size(args[1]) == sz);
expr_ref rm(m), x(m);
rm = args[0];
x = args[1];
expr_ref sgn(m), sig(m), exp(m);
sgn = m_bv_util.mk_extract(sz - 1, sz - 1, x);
sig = m_bv_util.mk_extract(sz - ebits - 2, 0, x);
exp = m_bv_util.mk_extract(sz - 2, sz - ebits - 1, x);
round(f->get_range(), rm, sgn, sig, exp, result);
}
void fpa2bv_converter::mk_to_fp_unsigned(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
TRACE("fpa2bv_to_fp_unsigned", for (unsigned i = 0; i < num; i++)
tout << "arg" << i << " = " << mk_ismt2_pp(args[i], m) << std::endl;);
NOT_IMPLEMENTED_YET();
}
void fpa2bv_converter::mk_to_ieee_bv(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
SASSERT(num == 1);
expr * sgn, * s, * e;