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Add btor $shift/$shiftx support

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This commit is contained in:
Clifford Wolf 2017-12-11 14:24:19 +01:00
parent cc119b5232
commit 82d1fd77de
2 changed files with 37 additions and 7 deletions
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40
backends/btor/btor.cc
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@ -123,7 +123,7 @@ struct BtorWorker
if (cell->type.in("$shl", "$sshl")) btor_op = "sll";
if (cell->type == "$shr") btor_op = "srl";
if (cell->type == "$sshr") btor_op = "sra";
// if (cell->type.in("$shift", "$shiftx")) btor_op = "shift";
if (cell->type.in("$shift", "$shiftx")) btor_op = "shift";
if (cell->type.in("$and", "$_AND_")) btor_op = "and";
if (cell->type.in("$or", "$_OR_")) btor_op = "or";
if (cell->type.in("$xor", "$_XOR_")) btor_op = "xor";
@ -139,6 +139,9 @@ struct BtorWorker
bool a_signed = cell->hasParam("\\A_SIGNED") ? cell->getParam("\\A_SIGNED").as_bool() : false;
bool b_signed = cell->hasParam("\\B_SIGNED") ? cell->getParam("\\B_SIGNED").as_bool() : false;
if (btor_op == "shift" && !b_signed)
btor_op = "srl";
if (cell->type.in("$shl", "$sshl", "$shr", "$sshr"))
b_signed = false;
@ -146,11 +149,38 @@ struct BtorWorker
btor_op = "srl";
int sid = get_bv_sid(width);
int nid_a = get_sig_nid(cell->getPort("\\A"), width, a_signed);
int nid_b = get_sig_nid(cell->getPort("\\B"), width, b_signed);
int nid;
int nid = next_nid++;
btorf("%d %s %d %d %d\n", nid, btor_op.c_str(), sid, nid_a, nid_b);
if (btor_op == "shift")
{
int nid_a = get_sig_nid(cell->getPort("\\A"), width, false);
int nid_b = get_sig_nid(cell->getPort("\\B"), width, b_signed);
int nid_r = next_nid++;
btorf("%d srl %d %d %d\n", nid_r, sid, nid_a, nid_b);
int nid_b_neg = next_nid++;
btorf("%d neg %d %d\n", nid_b_neg, sid, nid_b);
int nid_l = next_nid++;
btorf("%d sll %d %d %d\n", nid_l, sid, nid_a, nid_b_neg);
int sid_bit = get_bv_sid(1);
int nid_zero = get_sig_nid(Const(0, width));
int nid_b_ltz = next_nid++;
btorf("%d slt %d %d %d\n", nid_b_ltz, sid_bit, nid_b, nid_zero);
nid = next_nid++;
btorf("%d ite %d %d %d %d\n", nid, sid, nid_b_ltz, nid_l, nid_r);
}
else
{
int nid_a = get_sig_nid(cell->getPort("\\A"), width, a_signed);
int nid_b = get_sig_nid(cell->getPort("\\B"), width, b_signed);
nid = next_nid++;
btorf("%d %s %d %d %d\n", nid, btor_op.c_str(), sid, nid_a, nid_b);
}
SigSpec sig = sigmap(cell->getPort("\\Y"));