diff options
Diffstat (limited to 'kernel/celledges.cc')
-rw-r--r-- | kernel/celledges.cc | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/kernel/celledges.cc b/kernel/celledges.cc new file mode 100644 index 00000000..556e8b82 --- /dev/null +++ b/kernel/celledges.cc @@ -0,0 +1,209 @@ +/* + * yosys -- Yosys Open SYnthesis Suite + * + * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#include "kernel/celledges.h" + +USING_YOSYS_NAMESPACE +PRIVATE_NAMESPACE_BEGIN + +void bitwise_unary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", Y = "\\Y"; + + bool is_signed = cell->getParam("\\A_SIGNED").as_bool(); + int a_width = GetSize(cell->getPort(A)); + int y_width = GetSize(cell->getPort(Y)); + + for (int i = 0; i < y_width; i++) + { + if (i < a_width) + db->add_edge(cell, A, i, Y, i, -1); + else if (is_signed && a_width > 0) + db->add_edge(cell, A, a_width-1, Y, i, -1); + } +} + +void bitwise_binary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", B = "\\B", Y = "\\Y"; + + bool is_signed = cell->getParam("\\A_SIGNED").as_bool(); + int a_width = GetSize(cell->getPort(A)); + int b_width = GetSize(cell->getPort(B)); + int y_width = GetSize(cell->getPort(Y)); + + if (cell->type == "$and" && !is_signed) { + if (a_width > b_width) + a_width = b_width; + else + b_width = a_width; + } + + for (int i = 0; i < y_width; i++) + { + if (i < a_width) + db->add_edge(cell, A, i, Y, i, -1); + else if (is_signed && a_width > 0) + db->add_edge(cell, A, a_width-1, Y, i, -1); + + if (i < b_width) + db->add_edge(cell, B, i, Y, i, -1); + else if (is_signed && b_width > 0) + db->add_edge(cell, B, b_width-1, Y, i, -1); + } +} + +void arith_neg_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", Y = "\\Y"; + + bool is_signed = cell->getParam("\\A_SIGNED").as_bool(); + int a_width = GetSize(cell->getPort(A)); + int y_width = GetSize(cell->getPort(Y)); + + if (is_signed && a_width == 1) + y_width = std::min(y_width, 1); + + for (int i = 0; i < y_width; i++) + for (int k = 0; k <= i && k < a_width; k++) + db->add_edge(cell, A, k, Y, i, -1); +} + +void arith_binary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", B = "\\B", Y = "\\Y"; + + bool is_signed = cell->getParam("\\A_SIGNED").as_bool(); + int a_width = GetSize(cell->getPort(A)); + int b_width = GetSize(cell->getPort(B)); + int y_width = GetSize(cell->getPort(Y)); + + if (!is_signed && cell->type != "$sub") { + int ab_width = std::max(a_width, b_width); + y_width = std::min(y_width, ab_width+1); + } + + for (int i = 0; i < y_width; i++) + { + for (int k = 0; k <= i; k++) + { + if (k < a_width) + db->add_edge(cell, A, k, Y, i, -1); + + if (k < b_width) + db->add_edge(cell, B, k, Y, i, -1); + } + } +} + +void reduce_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", Y = "\\Y"; + + int a_width = GetSize(cell->getPort(A)); + + for (int i = 0; i < a_width; i++) + db->add_edge(cell, A, i, Y, 0, -1); +} + +void compare_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", B = "\\B", Y = "\\Y"; + + int a_width = GetSize(cell->getPort(A)); + int b_width = GetSize(cell->getPort(B)); + + for (int i = 0; i < a_width; i++) + db->add_edge(cell, A, i, Y, 0, -1); + + for (int i = 0; i < b_width; i++) + db->add_edge(cell, B, i, Y, 0, -1); +} + +void mux_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell) +{ + IdString A = "\\A", B = "\\B", S = "\\S", Y = "\\Y"; + + int a_width = GetSize(cell->getPort(A)); + int b_width = GetSize(cell->getPort(B)); + int s_width = GetSize(cell->getPort(S)); + + for (int i = 0; i < a_width; i++) + { + db->add_edge(cell, A, i, Y, i, -1); + + for (int k = i; k < b_width; k += a_width) + db->add_edge(cell, B, k, Y, i, -1); + + for (int k = 0; k < s_width; k++) + db->add_edge(cell, S, k, Y, i, -1); + } +} + +PRIVATE_NAMESPACE_END + +bool YOSYS_NAMESPACE_PREFIX AbstractCellEdgesDatabase::add_edges_from_cell(RTLIL::Cell *cell) +{ + if (cell->type.in("$not", "$pos")) { + bitwise_unary_op(this, cell); + return true; + } + + if (cell->type.in("$and", "$or", "$xor", "$xnor")) { + bitwise_binary_op(this, cell); + return true; + } + + if (cell->type == "$neg") { + arith_neg_op(this, cell); + return true; + } + + if (cell->type.in("$add", "$sub")) { + arith_binary_op(this, cell); + return true; + } + + if (cell->type.in("$reduce_and", "$reduce_or", "$reduce_xor", "$reduce_xnor", "$reduce_bool", "$logic_not")) { + reduce_op(this, cell); + return true; + } + + // FIXME: + // if (cell->type.in("$shl", "$shr", "$sshl", "$sshr", "$shift", "$shiftx")) { + // shift_op(this, cell); + // return true; + // } + + if (cell->type.in("$lt", "$le", "$eq", "$ne", "$eqx", "$nex", "$ge", "$gt")) { + compare_op(this, cell); + return true; + } + + if (cell->type.in("$mux", "$pmux")) { + mux_op(this, cell); + return true; + } + + // FIXME: $mul $div $mod $slice $concat + // FIXME: $lut $sop $alu $lcu $macc $fa + + return false; +} + |