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bit_blaster unit tests for adder and multiplier (#5514)
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These tests cover a mix of constant and non-constant input bits.
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@jameysharp
jameysharp authored Aug 27, 2021
1 parent 8f306c6 commit cd7a826
Showing 1 changed file with 149 additions and 27 deletions.
176 changes: 149 additions & 27 deletions src/test/bit_blaster.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,9 +17,12 @@ Revision History:
--*/

#include "ast/rewriter/bit_blaster/bit_blaster.h"
#include "ast/ast_pp.h"
#include "ast/ast_ll_pp.h"
#include "ast/reg_decl_plugins.h"
#include "ast/rewriter/bit_blaster/bit_blaster.h"
#include "model/model.h"
#include "model/model_evaluator.h"

void mk_bits(ast_manager & m, char const * prefix, unsigned sz, expr_ref_vector & r) {
sort_ref b(m);
Expand All @@ -36,38 +39,153 @@ void mk_bits(ast_manager & m, char const * prefix, unsigned sz, expr_ref_vector
}

void display(std::ostream & out, expr_ref_vector & r, bool ll=true) {
ast_mark v;
for (unsigned i = 0; i < r.size(); i++) {
out << "bit " << i << ":\n";
if (ll)
ast_ll_pp(out, r.get_manager(), r.get(i), v);
ast_ll_pp(out, r.get_manager(), r.get(i));
else
out << mk_pp(r.get(i), r.get_manager());
out << "\n";
out << mk_pp(r.get(i), r.get_manager()) << "\n";
}
}

void tst_adder(ast_manager & m, unsigned sz) {
// expr_ref_vector a(m);
// expr_ref_vector b(m);
// expr_ref_vector c(m);
// mk_bits(m, "a", sz, a);
// mk_bits(m, "b", sz, b);
// bool t = true;
// bit_blaster blaster(m, t);
// blaster.mk_adder(sz, a.c_ptr(), b.c_ptr(), c);
// TRACE("bit_blaster", display(tout, c););
static unsigned to_int(model_core & mdl, expr_ref_vector & out) {
SASSERT(out.size() <= sizeof(unsigned) * 8);
ast_manager & m = mdl.get_manager();
model_evaluator eval(mdl);
expr_ref bit(m);
unsigned actual = 0;
for (unsigned i = 0; i < out.size(); i++) {
eval(out.get(i), bit);
if (m.is_true(bit))
actual |= 1 << i;
else
ENSURE(m.is_false(bit));
}
return actual;
}

void tst_multiplier(ast_manager & m, unsigned sz) {
// expr_ref_vector a(m);
// expr_ref_vector b(m);
// expr_ref_vector c(m);
// mk_bits(m, "a", sz, a);
// mk_bits(m, "b", sz, b);
// bool t = true;
// bit_blaster blaster(m, t);
// blaster.mk_multiplier(sz, a.c_ptr(), b.c_ptr(), c);
// TRACE("bit_blaster", display(tout, c););
#define ENSURE_INT(mdl, out, expected) \
do { \
unsigned actual = to_int(mdl, out); \
TRACE("bit_blaster", \
display(tout, out); \
tout << "expected=" << (expected) << ", actual=" << actual << "\n"; \
); \
ENSURE(actual == (expected)); \
} while (0)

void tst_adder(ast_manager & m, bit_blaster & blaster) {
model mdl(m);
expr_ref_vector c(m);
app_ref b1(m.mk_const("b1", m.mk_bool_sort()), m);
app_ref b2(m.mk_const("b2", m.mk_bool_sort()), m);
expr_ref not_b1(m.mk_not(b1), m);

{
expr * const a[] = { b1, b1, b1 };
expr * const b[] = { m.mk_false(), m.mk_true(), m.mk_true() };
c.reset();
blaster.mk_adder(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 6); // b000 + b110

mdl.register_decl(b1->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 5); // b111 + b110

{
expr * const a[] = { m.mk_false(), m.mk_true(), m.mk_true() };
expr * const b[] = { b1, not_b1, m.mk_false() };
c.reset();
blaster.mk_adder(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 0); // b110 + b010

mdl.register_decl(b1->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 7); // b110 + b001

{
expr * const a[] = { b1, b2, m.mk_true() };
expr * const b[] = { b1, not_b1, m.mk_false() };
c.reset();
blaster.mk_adder(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
mdl.register_decl(b2->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 6); // b100 + b010

mdl.register_decl(b1->get_decl(), m.mk_false());
mdl.register_decl(b2->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 0); // b110 + b010

mdl.register_decl(b1->get_decl(), m.mk_true());
mdl.register_decl(b2->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 6); // b101 + b001

mdl.register_decl(b1->get_decl(), m.mk_true());
mdl.register_decl(b2->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 0); // b111 + b001
}

void tst_multiplier(ast_manager & m, bit_blaster & blaster) {
model mdl(m);
expr_ref_vector c(m);
app_ref b1(m.mk_const("b1", m.mk_bool_sort()), m);
app_ref b2(m.mk_const("b2", m.mk_bool_sort()), m);
expr_ref not_b1(m.mk_not(b1), m);

{
expr * const a[] = { b1, b1, b1 };
expr * const b[] = { m.mk_false(), m.mk_true(), m.mk_true() };
c.reset();
blaster.mk_multiplier(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 0); // b000 * b110

mdl.register_decl(b1->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 2); // b111 * b110

{
expr * const a[] = { m.mk_false(), m.mk_true(), m.mk_true() };
expr * const b[] = { b1, not_b1, m.mk_false() };
c.reset();
blaster.mk_multiplier(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 4); // b110 * b010

mdl.register_decl(b1->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 6); // b110 * b001

{
expr * const a[] = { b1, b2, m.mk_true() };
expr * const b[] = { b1, not_b1, m.mk_false() };
c.reset();
blaster.mk_multiplier(3, a, b, c);
}

mdl.register_decl(b1->get_decl(), m.mk_false());
mdl.register_decl(b2->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 0); // b100 * b010

mdl.register_decl(b1->get_decl(), m.mk_false());
mdl.register_decl(b2->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 4); // b110 * b010

mdl.register_decl(b1->get_decl(), m.mk_true());
mdl.register_decl(b2->get_decl(), m.mk_false());
ENSURE_INT(mdl, c, 5); // b101 * b001

mdl.register_decl(b1->get_decl(), m.mk_true());
mdl.register_decl(b2->get_decl(), m.mk_true());
ENSURE_INT(mdl, c, 7); // b111 * b001
}

void tst_le(ast_manager & m, unsigned sz) {
Expand Down Expand Up @@ -115,8 +233,12 @@ void tst_sh(ast_manager & m, unsigned sz) {

void tst_bit_blaster() {
ast_manager m;
tst_adder(m, 4);
tst_multiplier(m, 4);
reg_decl_plugins(m);
bit_blaster_params params;
bit_blaster blaster(m, params);

tst_adder(m, blaster);
tst_multiplier(m, blaster);
tst_le(m, 4);
tst_eqs(m, 8);
tst_sh(m, 4);
Expand Down

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