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Bugfix for special-case handling in fp.fma.

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Thanks to Florian Schanda for reporting this bug.
This commit is contained in:
Christoph M. Wintersteiger 2016-12-09 13:43:05 +00:00
parent 9df5c31485
commit 56b1a8b086
2 changed files with 31 additions and 24 deletions
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12
src/ast/fpa/fpa2bv_converter.cpp
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@ -1463,11 +1463,17 @@ void fpa2bv_converter::mk_fma(func_decl * f, unsigned num, expr * const * args,
v6 = z;
// (x is 0) || (y is 0) -> z
expr_ref c71(m), xy_sgn(m), xyz_sgn(m);
m_simp.mk_or(x_is_zero, y_is_zero, c7);
expr_ref ite_c(m), rm_is_not_to_neg(m);
m_simp.mk_xor(x_is_neg, y_is_neg, xy_sgn);
m_simp.mk_xor(xy_sgn, z_is_neg, xyz_sgn);
m_simp.mk_and(z_is_zero, xyz_sgn, c71);
expr_ref zero_cond(m), rm_is_not_to_neg(m);
rm_is_not_to_neg = m.mk_not(rm_is_to_neg);
m_simp.mk_and(z_is_zero, rm_is_not_to_neg, ite_c);
mk_ite(ite_c, pzero, z, v7);
m_simp.mk_ite(rm_is_to_neg, nzero, pzero, zero_cond);
mk_ite(c71, zero_cond, z, v7);
// else comes the fused multiplication.
unsigned ebits = m_util.get_ebits(f->get_range());