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Merge pull request #1851 from YosysHQ/claire/bitselwrite

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Improved rewrite code for writing to bit slice
This commit is contained in:
Claire Wolf 2020-04-21 18:46:52 +02:00 committed by GitHub
parent abc8f1fcb6 d32e56a3d1
commit 9e1afde7a0
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GPG key ID: 4AEE18F83AFDEB23
17 changed files with 1431 additions and 15 deletions
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5
frontends/ast/ast.cc
View file

@ -218,6 +218,7 @@ AstNode::AstNode(AstNodeType type, AstNode *child1, AstNode *child2, AstNode *ch
realvalue = 0; realvalue = 0;
id2ast = NULL; id2ast = NULL;
basic_prep = false; basic_prep = false;
lookahead = false;
if (child1) if (child1)
children.push_back(child1); children.push_back(child1);
@ -310,6 +311,10 @@ void AstNode::dumpAst(FILE *f, std::string indent) const
fprintf(f, " reg"); fprintf(f, " reg");
if (is_signed) if (is_signed)
fprintf(f, " signed"); fprintf(f, " signed");
if (basic_prep)
fprintf(f, " basic_prep");
if (lookahead)
fprintf(f, " lookahead");
if (port_id > 0) if (port_id > 0)
fprintf(f, " port=%d", port_id); fprintf(f, " port=%d", port_id);
if (range_valid || range_left != -1 || range_right != 0) if (range_valid || range_left != -1 || range_right != 0)

4
frontends/ast/ast.h
View file

@ -202,6 +202,9 @@ namespace AST
// this is used by simplify to detect if basic analysis has been performed already on the node // this is used by simplify to detect if basic analysis has been performed already on the node
bool basic_prep; bool basic_prep;
// this is used for ID references in RHS expressions that should use the "new" value for non-blocking assignments
bool lookahead;
// this is the original sourcecode location that resulted in this AST node // this is the original sourcecode location that resulted in this AST node
// it is automatically set by the constructor using AST::current_filename and // it is automatically set by the constructor using AST::current_filename and
// the AST::get_line_num() callback function. // the AST::get_line_num() callback function.
@ -352,6 +355,7 @@ namespace AST_INTERNAL
extern AST::AstNode *current_always, *current_top_block, *current_block, *current_block_child; extern AST::AstNode *current_always, *current_top_block, *current_block, *current_block_child;
extern AST::AstModule *current_module; extern AST::AstModule *current_module;
extern bool current_always_clocked; extern bool current_always_clocked;
struct LookaheadRewriter;
struct ProcessGenerator; struct ProcessGenerator;
} }

131
frontends/ast/genrtlil.cc
View file

@ -157,6 +157,126 @@ static RTLIL::SigSpec mux2rtlil(AstNode *that, const RTLIL::SigSpec &cond, const
return wire; return wire;
} }
// helper class for rewriting simple lookahead references in AST always blocks
struct AST_INTERNAL::LookaheadRewriter
{
dict<IdString, pair<AstNode*, AstNode*>> lookaheadids;
void collect_lookaheadids(AstNode *node)
{
if (node->lookahead) {
log_assert(node->type == AST_IDENTIFIER);
if (!lookaheadids.count(node->str)) {
AstNode *wire = new AstNode(AST_WIRE);
for (auto c : node->id2ast->children)
wire->children.push_back(c->clone());
wire->str = stringf("$lookahead%s$%d", node->str.c_str(), autoidx++);
wire->attributes["\\nosync"] = AstNode::mkconst_int(1, false);
wire->is_logic = true;
while (wire->simplify(true, false, false, 1, -1, false, false)) { }
current_ast_mod->children.push_back(wire);
lookaheadids[node->str] = make_pair(node->id2ast, wire);
wire->genRTLIL();
}
}
for (auto child : node->children)
collect_lookaheadids(child);
}
bool has_lookaheadids(AstNode *node)
{
if (node->type == AST_IDENTIFIER && lookaheadids.count(node->str) != 0)
return true;
for (auto child : node->children)
if (has_lookaheadids(child))
return true;
return false;
}
bool has_nonlookaheadids(AstNode *node)
{
if (node->type == AST_IDENTIFIER && lookaheadids.count(node->str) == 0)
return true;
for (auto child : node->children)
if (has_nonlookaheadids(child))
return true;
return false;
}
void rewrite_lookaheadids(AstNode *node, bool lhs = false)
{
if (node->type == AST_ASSIGN_LE)
{
if (has_lookaheadids(node->children[0]))
{
if (has_nonlookaheadids(node->children[0]))
log_error("incompatible mix of lookahead and non-lookahead IDs in LHS expression.\n");
rewrite_lookaheadids(node->children[0], true);
node->type = AST_ASSIGN_EQ;
}
rewrite_lookaheadids(node->children[1], lhs);
return;
}
if (node->type == AST_IDENTIFIER && (node->lookahead || lhs)) {
AstNode *newwire = lookaheadids.at(node->str).second;
node->str = newwire->str;
node->id2ast = newwire;
lhs = false;
}
for (auto child : node->children)
rewrite_lookaheadids(child, lhs);
}
LookaheadRewriter(AstNode *top)
{
// top->dumpAst(NULL, "REWRITE-BEFORE> ");
// top->dumpVlog(NULL, "REWRITE-BEFORE> ");
AstNode *block = nullptr;
for (auto c : top->children)
if (c->type == AST_BLOCK) {
log_assert(block == nullptr);
block = c;
}
log_assert(block != nullptr);
collect_lookaheadids(block);
rewrite_lookaheadids(block);
for (auto it : lookaheadids)
{
AstNode *ref_orig = new AstNode(AST_IDENTIFIER);
ref_orig->str = it.second.first->str;
ref_orig->id2ast = it.second.first;
ref_orig->was_checked = true;
AstNode *ref_temp = new AstNode(AST_IDENTIFIER);
ref_temp->str = it.second.second->str;
ref_temp->id2ast = it.second.second;
ref_temp->was_checked = true;
AstNode *init_assign = new AstNode(AST_ASSIGN_EQ, ref_temp->clone(), ref_orig->clone());
AstNode *final_assign = new AstNode(AST_ASSIGN_LE, ref_orig, ref_temp);
block->children.insert(block->children.begin(), init_assign);
block->children.push_back(final_assign);
}
// top->dumpAst(NULL, "REWRITE-AFTER> ");
// top->dumpVlog(NULL, "REWRITE-AFTER> ");
}
};
// helper class for converting AST always nodes to RTLIL processes // helper class for converting AST always nodes to RTLIL processes
struct AST_INTERNAL::ProcessGenerator struct AST_INTERNAL::ProcessGenerator
{ {
@ -191,6 +311,9 @@ struct AST_INTERNAL::ProcessGenerator
ProcessGenerator(AstNode *always, RTLIL::SigSpec initSyncSignalsArg = RTLIL::SigSpec()) : always(always), initSyncSignals(initSyncSignalsArg) ProcessGenerator(AstNode *always, RTLIL::SigSpec initSyncSignalsArg = RTLIL::SigSpec()) : always(always), initSyncSignals(initSyncSignalsArg)
{ {
// rewrite lookahead references
LookaheadRewriter la_rewriter(always);
// generate process and simple root case // generate process and simple root case
proc = new RTLIL::Process; proc = new RTLIL::Process;
proc->attributes[ID::src] = stringf("%s:%d.%d-%d.%d", always->filename.c_str(), always->location.first_line, always->location.first_column, always->location.last_line, always->location.last_column); proc->attributes[ID::src] = stringf("%s:%d.%d-%d.%d", always->filename.c_str(), always->location.first_line, always->location.first_column, always->location.last_line, always->location.last_column);
@ -338,7 +461,7 @@ struct AST_INTERNAL::ProcessGenerator
return chunks; return chunks;
} }
// recursively traverse the AST an collect all assigned signals // recursively traverse the AST and collect all assigned signals
void collect_lvalues(RTLIL::SigSpec &reg, AstNode *ast, bool type_eq, bool type_le, bool run_sort_and_unify = true) void collect_lvalues(RTLIL::SigSpec &reg, AstNode *ast, bool type_eq, bool type_le, bool run_sort_and_unify = true)
{ {
switch (ast->type) switch (ast->type)
@ -1010,7 +1133,9 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
int add_undef_bits_msb = 0; int add_undef_bits_msb = 0;
int add_undef_bits_lsb = 0; int add_undef_bits_lsb = 0;
if (id2ast && id2ast->type == AST_AUTOWIRE && current_module->wires_.count(str) == 0) { log_assert(id2ast != nullptr);
if (id2ast->type == AST_AUTOWIRE && current_module->wires_.count(str) == 0) {
RTLIL::Wire *wire = current_module->addWire(str); RTLIL::Wire *wire = current_module->addWire(str);
wire->attributes[ID::src] = stringf("%s:%d.%d-%d.%d", filename.c_str(), location.first_line, location.first_column, location.last_line, location.last_column); wire->attributes[ID::src] = stringf("%s:%d.%d-%d.%d", filename.c_str(), location.first_line, location.first_column, location.last_line, location.last_column);
wire->name = str; wire->name = str;
@ -1025,7 +1150,7 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint)
chunk = RTLIL::Const(id2ast->children[0]->bits); chunk = RTLIL::Const(id2ast->children[0]->bits);
goto use_const_chunk; goto use_const_chunk;
} }
else if (id2ast && (id2ast->type == AST_WIRE || id2ast->type == AST_AUTOWIRE || id2ast->type == AST_MEMORY) && current_module->wires_.count(str) != 0) { else if ((id2ast->type == AST_WIRE || id2ast->type == AST_AUTOWIRE || id2ast->type == AST_MEMORY) && current_module->wires_.count(str) != 0) {
RTLIL::Wire *current_wire = current_module->wire(str); RTLIL::Wire *current_wire = current_module->wire(str);
if (current_wire->get_bool_attribute(ID::is_interface)) if (current_wire->get_bool_attribute(ID::is_interface))
is_interface = true; is_interface = true;

82
frontends/ast/simplify.cc
View file

@ -1754,8 +1754,10 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
} }
// replace dynamic ranges in left-hand side expressions (e.g. "foo[bar] <= 1'b1;") with // replace dynamic ranges in left-hand side expressions (e.g. "foo[bar] <= 1'b1;") with
// a big case block that selects the correct single-bit assignment. // either a big case block that selects the correct single-bit assignment, or mask and
if (type == AST_ASSIGN_EQ || type == AST_ASSIGN_LE) { // shift operations.
if (type == AST_ASSIGN_EQ || type == AST_ASSIGN_LE)
{
if (children[0]->type != AST_IDENTIFIER || children[0]->children.size() == 0) if (children[0]->type != AST_IDENTIFIER || children[0]->children.size() == 0)
goto skip_dynamic_range_lvalue_expansion; goto skip_dynamic_range_lvalue_expansion;
if (children[0]->children[0]->range_valid || did_something) if (children[0]->children[0]->range_valid || did_something)
@ -1764,10 +1766,13 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
goto skip_dynamic_range_lvalue_expansion; goto skip_dynamic_range_lvalue_expansion;
if (!children[0]->id2ast->range_valid) if (!children[0]->id2ast->range_valid)
goto skip_dynamic_range_lvalue_expansion; goto skip_dynamic_range_lvalue_expansion;
int source_width = children[0]->id2ast->range_left - children[0]->id2ast->range_right + 1; int source_width = children[0]->id2ast->range_left - children[0]->id2ast->range_right + 1;
int result_width = 1; int result_width = 1;
AstNode *shift_expr = NULL; AstNode *shift_expr = NULL;
AstNode *range = children[0]->children[0]; AstNode *range = children[0]->children[0];
if (range->children.size() == 1) { if (range->children.size() == 1) {
shift_expr = range->children[0]->clone(); shift_expr = range->children[0]->clone();
} else { } else {
@ -1780,19 +1785,72 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
log_file_error(filename, location.first_line, "Unsupported expression on dynamic range select on signal `%s'!\n", str.c_str()); log_file_error(filename, location.first_line, "Unsupported expression on dynamic range select on signal `%s'!\n", str.c_str());
result_width = abs(int(left_at_zero_ast->integer - right_at_zero_ast->integer)) + 1; result_width = abs(int(left_at_zero_ast->integer - right_at_zero_ast->integer)) + 1;
} }
did_something = true;
newNode = new AstNode(AST_CASE, shift_expr); if (0)
for (int i = 0; i < source_width; i++) { {
int start_bit = children[0]->id2ast->range_right + i; // big case block
AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true));
did_something = true;
newNode = new AstNode(AST_CASE, shift_expr);
for (int i = 0; i < source_width; i++) {
int start_bit = children[0]->id2ast->range_right + i;
AstNode *cond = new AstNode(AST_COND, mkconst_int(start_bit, true));
AstNode *lvalue = children[0]->clone();
lvalue->delete_children();
int end_bit = std::min(start_bit+result_width,source_width) - 1;
lvalue->children.push_back(new AstNode(AST_RANGE,
mkconst_int(end_bit, true), mkconst_int(start_bit, true)));
cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone())));
newNode->children.push_back(cond);
}
}
else
{
// mask and shift operations, disabled for now
AstNode *wire_mask = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(source_width-1, true), mkconst_int(0, true)));
wire_mask->str = stringf("$bitselwrite$mask$%s:%d$%d", filename.c_str(), location.first_line, autoidx++);
wire_mask->attributes["\\nosync"] = AstNode::mkconst_int(1, false);
wire_mask->is_logic = true;
while (wire_mask->simplify(true, false, false, 1, -1, false, false)) { }
current_ast_mod->children.push_back(wire_mask);
AstNode *wire_data = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(source_width-1, true), mkconst_int(0, true)));
wire_data->str = stringf("$bitselwrite$data$%s:%d$%d", filename.c_str(), location.first_line, autoidx++);
wire_data->attributes["\\nosync"] = AstNode::mkconst_int(1, false);
wire_data->is_logic = true;
while (wire_data->simplify(true, false, false, 1, -1, false, false)) { }
current_ast_mod->children.push_back(wire_data);
did_something = true;
newNode = new AstNode(AST_BLOCK);
AstNode *lvalue = children[0]->clone(); AstNode *lvalue = children[0]->clone();
lvalue->delete_children(); lvalue->delete_children();
int end_bit = std::min(start_bit+result_width,source_width) - 1;
lvalue->children.push_back(new AstNode(AST_RANGE, AstNode *ref_mask = new AstNode(AST_IDENTIFIER);
mkconst_int(end_bit, true), mkconst_int(start_bit, true))); ref_mask->str = wire_mask->str;
cond->children.push_back(new AstNode(AST_BLOCK, new AstNode(type, lvalue, children[1]->clone()))); ref_mask->id2ast = wire_mask;
newNode->children.push_back(cond); ref_mask->was_checked = true;
AstNode *ref_data = new AstNode(AST_IDENTIFIER);
ref_data->str = wire_data->str;
ref_data->id2ast = wire_data;
ref_data->was_checked = true;
AstNode *old_data = lvalue->clone();
if (type == AST_ASSIGN_LE)
old_data->lookahead = true;
AstNode *shamt = shift_expr;
newNode->children.push_back(new AstNode(AST_ASSIGN_EQ, ref_mask->clone(),
new AstNode(AST_SHIFT_LEFT, mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false), shamt->clone())));
newNode->children.push_back(new AstNode(AST_ASSIGN_EQ, ref_data->clone(),
new AstNode(AST_SHIFT_LEFT, new AstNode(AST_BIT_AND, mkconst_bits(std::vector<RTLIL::State>(result_width, State::S1), false), children[1]->clone()), shamt)));
newNode->children.push_back(new AstNode(type, lvalue, new AstNode(AST_BIT_OR, new AstNode(AST_BIT_AND, old_data, new AstNode(AST_BIT_NOT, ref_mask)), ref_data)));
} }
goto apply_newNode; goto apply_newNode;
} }
skip_dynamic_range_lvalue_expansion:; skip_dynamic_range_lvalue_expansion:;

106
tests/various/dynamic_part_select.ys Normal file
View file

@ -0,0 +1,106 @@
### Original testcase ###
read_verilog ./dynamic_part_select/original.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/original_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv
### Multiple blocking assingments ###
design -reset
read_verilog ./dynamic_part_select/multiple_blocking.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/multiple_blocking_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv
### Non-blocking to the same output register ###
design -reset
read_verilog ./dynamic_part_select/nonblocking.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/nonblocking_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv
### For-loop select, one dynamic input
design -reset
read_verilog ./dynamic_part_select/forloop_select.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/forloop_select_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv
#### Double loop (part-select, reset) ###
design -reset
read_verilog ./dynamic_part_select/reset_test.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/reset_test_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv
### Reversed part-select case ###
design -reset
read_verilog ./dynamic_part_select/reversed.v
proc
rename -top gold
design -stash gold
read_verilog ./dynamic_part_select/reversed_gate.v
proc
rename -top gate
design -stash gate
design -copy-from gold -as gold gold
design -copy-from gate -as gate gate
miter -equiv -make_assert -make_outcmp -flatten gold gate equiv
sat -prove-asserts -seq 10 -show-public -verify -set-init-zero equiv

19
tests/various/dynamic_part_select/forloop_select.v Normal file
View file

@ -0,0 +1,19 @@
module forloop_select #(parameter WIDTH=16, SELW=4, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input en,
output reg [WIDTH-1:0] dout);
reg [SELW:0] sel;
localparam SLICE = WIDTH/(SELW**2);
always @(posedge clk)
begin
if (en) begin
for (sel = 0; sel <= 4'hf; sel=sel+1'b1)
dout[(ctrl*sel)+:SLICE] <= din;
end
end
endmodule

559
tests/various/dynamic_part_select/forloop_select_gate.v Normal file
View file

@ -0,0 +1,559 @@
module forloop_select_gate (clk, ctrl, din, en, dout);
input clk;
input [3:0] ctrl;
input [15:0] din;
input en;
output reg [15:0] dout;
reg [4:0] sel;
always @(posedge clk)
case (|(en))
1'b 1:
begin
case (({(ctrl)*(0)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00001)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00010)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00011)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00100)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00101)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00110)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 00111)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01000)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01001)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01010)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01011)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01100)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01101)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01110)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
case (({(ctrl)*(5'b 01111)})+(0))
0:
dout[0:0] <= din;
1:
dout[1:1] <= din;
2:
dout[2:2] <= din;
3:
dout[3:3] <= din;
4:
dout[4:4] <= din;
5:
dout[5:5] <= din;
6:
dout[6:6] <= din;
7:
dout[7:7] <= din;
8:
dout[8:8] <= din;
9:
dout[9:9] <= din;
10:
dout[10:10] <= din;
11:
dout[11:11] <= din;
12:
dout[12:12] <= din;
13:
dout[13:13] <= din;
14:
dout[14:14] <= din;
15:
dout[15:15] <= din;
endcase
sel = 5'b 10000;
end
endcase
endmodule

19
tests/various/dynamic_part_select/multiple_blocking.v Normal file
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@ -0,0 +1,19 @@
module multiple_blocking #(parameter WIDTH=32, SELW=1, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input [SELW-1:0] sel,
output reg [WIDTH-1:0] dout);
localparam SLICE = WIDTH/(SELW**2);
reg [CTRLW:0] a;
reg [SELW-1:0] b;
reg [DINW:0] c;
always @(posedge clk) begin
a = ctrl + 1;
b = sel - 1;
c = ~din;
dout = dout + 1;
dout[a*b+:SLICE] = c;
end
endmodule

83
tests/various/dynamic_part_select/multiple_blocking_gate.v Normal file
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@ -0,0 +1,83 @@
module multiple_blocking_gate (clk, ctrl, din, sel, dout);
input clk;
input [4:0] ctrl;
input [1:0] din;
input [0:0] sel;
output reg [31:0] dout;
reg [5:0] a;
reg [0:0] b;
reg [2:0] c;
always @(posedge clk)
begin
a = (ctrl)+(1);
b = (sel)-(1);
c = ~(din);
dout = (dout)+(1);
case (({(a)*(b)})+(0))
0:
dout[31:0] = c;
1:
dout[31:1] = c;
2:
dout[31:2] = c;
3:
dout[31:3] = c;
4:
dout[31:4] = c;
5:
dout[31:5] = c;
6:
dout[31:6] = c;
7:
dout[31:7] = c;
8:
dout[31:8] = c;
9:
dout[31:9] = c;
10:
dout[31:10] = c;
11:
dout[31:11] = c;
12:
dout[31:12] = c;
13:
dout[31:13] = c;
14:
dout[31:14] = c;
15:
dout[31:15] = c;
16:
dout[31:16] = c;
17:
dout[31:17] = c;
18:
dout[31:18] = c;
19:
dout[31:19] = c;
20:
dout[31:20] = c;
21:
dout[31:21] = c;
22:
dout[31:22] = c;
23:
dout[31:23] = c;
24:
dout[31:24] = c;
25:
dout[31:25] = c;
26:
dout[31:26] = c;
27:
dout[31:27] = c;
28:
dout[31:28] = c;
29:
dout[31:29] = c;
30:
dout[31:30] = c;
31:
dout[31:31] = c;
endcase
end
endmodule

14
tests/various/dynamic_part_select/nonblocking.v Normal file
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@ -0,0 +1,14 @@
module nonblocking #(parameter WIDTH=32, SELW=1, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input [SELW-1:0] sel,
output reg [WIDTH-1:0] dout);
localparam SLICE = WIDTH/(SELW**2);
always @(posedge clk) begin
dout <= dout + 1;
dout[ctrl*sel+:SLICE] <= din ;
end
endmodule

77
tests/various/dynamic_part_select/nonblocking_gate.v Normal file
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@ -0,0 +1,77 @@
module nonblocking_gate (clk, ctrl, din, sel, dout);
input clk;
input [4:0] ctrl;
input [1:0] din;
input [0:0] sel;
output reg [31:0] dout;
always @(posedge clk)
begin
dout <= (dout)+(1);
case (({(ctrl)*(sel)})+(0))
0:
dout[31:0] <= din;
1:
dout[31:1] <= din;
2:
dout[31:2] <= din;
3:
dout[31:3] <= din;
4:
dout[31:4] <= din;
5:
dout[31:5] <= din;
6:
dout[31:6] <= din;
7:
dout[31:7] <= din;
8:
dout[31:8] <= din;
9:
dout[31:9] <= din;
10:
dout[31:10] <= din;
11:
dout[31:11] <= din;
12:
dout[31:12] <= din;
13:
dout[31:13] <= din;
14:
dout[31:14] <= din;
15:
dout[31:15] <= din;
16:
dout[31:16] <= din;
17:
dout[31:17] <= din;
18:
dout[31:18] <= din;
19:
dout[31:19] <= din;
20:
dout[31:20] <= din;
21:
dout[31:21] <= din;
22:
dout[31:22] <= din;
23:
dout[31:23] <= din;
24:
dout[31:24] <= din;
25:
dout[31:25] <= din;
26:
dout[31:26] <= din;
27:
dout[31:27] <= din;
28:
dout[31:28] <= din;
29:
dout[31:29] <= din;
30:
dout[31:30] <= din;
31:
dout[31:31] <= din;
endcase
end
endmodule

12
tests/various/dynamic_part_select/original.v Normal file
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@ -0,0 +1,12 @@
module original #(parameter WIDTH=32, SELW=1, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input [SELW-1:0] sel,
output reg [WIDTH-1:0] dout);
localparam SLICE = WIDTH/(SELW**2);
always @(posedge clk)
begin
dout[ctrl*sel+:SLICE] <= din ;
end
endmodule

74
tests/various/dynamic_part_select/original_gate.v Normal file
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@ -0,0 +1,74 @@
module original_gate (clk, ctrl, din, sel, dout);
input clk;
input [4:0] ctrl;
input [1:0] din;
input [0:0] sel;
output reg [31:0] dout;
always @(posedge clk)
case (({(ctrl)*(sel)})+(0))
0:
dout[31:0] <= din;
1:
dout[31:1] <= din;
2:
dout[31:2] <= din;
3:
dout[31:3] <= din;
4:
dout[31:4] <= din;
5:
dout[31:5] <= din;
6:
dout[31:6] <= din;
7:
dout[31:7] <= din;
8:
dout[31:8] <= din;
9:
dout[31:9] <= din;
10:
dout[31:10] <= din;
11:
dout[31:11] <= din;
12:
dout[31:12] <= din;
13:
dout[31:13] <= din;
14:
dout[31:14] <= din;
15:
dout[31:15] <= din;
16:
dout[31:16] <= din;
17:
dout[31:17] <= din;
18:
dout[31:18] <= din;
19:
dout[31:19] <= din;
20:
dout[31:20] <= din;
21:
dout[31:21] <= din;
22:
dout[31:22] <= din;
23:
dout[31:23] <= din;
24:
dout[31:24] <= din;
25:
dout[31:25] <= din;
26:
dout[31:26] <= din;
27:
dout[31:27] <= din;
28:
dout[31:28] <= din;
29:
dout[31:29] <= din;
30:
dout[31:30] <= din;
31:
dout[31:31] <= din;
endcase
endmodule

23
tests/various/dynamic_part_select/reset_test.v Normal file
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@ -0,0 +1,23 @@
module reset_test #(parameter WIDTH=32, SELW=1, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input [SELW-1:0] sel,
output reg [WIDTH-1:0] dout);
reg [SELW:0] i;
wire [SELW-1:0] rval = {reset, {SELW-1{1'b0}}};
localparam SLICE = WIDTH/(SELW**2);
// Doing exotic reset. masking 2 LSB bits to 0, 6 MSB bits to 1 for
// whatever reason.
always @(posedge clk) begin
if (reset) begin: reset_mask
for (i = 0; i < {SELW{1'b1}}; i=i+1) begin
dout[i*rval+:SLICE] <= 32'hDEAD;
end
end
//else begin
dout[ctrl*sel+:SLICE] <= din;
//end
end
endmodule

151
tests/various/dynamic_part_select/reset_test_gate.v Normal file
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@ -0,0 +1,151 @@
module reset_test_gate (clk, ctrl, din, sel, dout);
input clk;
input [4:0] ctrl;
input [1:0] din;
input [0:0] sel;
output reg [31:0] dout;
reg [1:0] i;
wire [0:0] rval;
assign rval = {reset, 1'b0 };
always @(posedge clk)
begin
case (|(reset))
1'b 1:
begin
case (({(0)*(rval)})+(0))
0:
dout[31:0] <= 57005;
1:
dout[31:1] <= 57005;
2:
dout[31:2] <= 57005;
3:
dout[31:3] <= 57005;
4:
dout[31:4] <= 57005;
5:
dout[31:5] <= 57005;
6:
dout[31:6] <= 57005;
7:
dout[31:7] <= 57005;
8:
dout[31:8] <= 57005;
9:
dout[31:9] <= 57005;
10:
dout[31:10] <= 57005;
11:
dout[31:11] <= 57005;
12:
dout[31:12] <= 57005;
13:
dout[31:13] <= 57005;
14:
dout[31:14] <= 57005;
15:
dout[31:15] <= 57005;
16:
dout[31:16] <= 57005;
17:
dout[31:17] <= 57005;
18:
dout[31:18] <= 57005;
19:
dout[31:19] <= 57005;
20:
dout[31:20] <= 57005;
21:
dout[31:21] <= 57005;
22:
dout[31:22] <= 57005;
23:
dout[31:23] <= 57005;
24:
dout[31:24] <= 57005;
25:
dout[31:25] <= 57005;
26:
dout[31:26] <= 57005;
27:
dout[31:27] <= 57005;
28:
dout[31:28] <= 57005;
29:
dout[31:29] <= 57005;
30:
dout[31:30] <= 57005;
31:
dout[31:31] <= 57005;
endcase
i = 1;
end
endcase
case (({(ctrl)*(sel)})+(0))
0:
dout[31:0] <= din;
1:
dout[31:1] <= din;
2:
dout[31:2] <= din;
3:
dout[31:3] <= din;
4:
dout[31:4] <= din;
5:
dout[31:5] <= din;
6:
dout[31:6] <= din;
7:
dout[31:7] <= din;
8:
dout[31:8] <= din;
9:
dout[31:9] <= din;
10:
dout[31:10] <= din;
11:
dout[31:11] <= din;
12:
dout[31:12] <= din;
13:
dout[31:13] <= din;
14:
dout[31:14] <= din;
15:
dout[31:15] <= din;
16:
dout[31:16] <= din;
17:
dout[31:17] <= din;
18:
dout[31:18] <= din;
19:
dout[31:19] <= din;
20:
dout[31:20] <= din;
21:
dout[31:21] <= din;
22:
dout[31:22] <= din;
23:
dout[31:23] <= din;
24:
dout[31:24] <= din;
25:
dout[31:25] <= din;
26:
dout[31:26] <= din;
27:
dout[31:27] <= din;
28:
dout[31:28] <= din;
29:
dout[31:29] <= din;
30:
dout[31:30] <= din;
31:
dout[31:31] <= din;
endcase
end
endmodule

13
tests/various/dynamic_part_select/reversed.v Normal file
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@ -0,0 +1,13 @@
module reversed #(parameter WIDTH=32, SELW=4, CTRLW=$clog2(WIDTH), DINW=2**SELW)
(input clk,
input [CTRLW-1:0] ctrl,
input [DINW-1:0] din,
input [SELW-1:0] sel,
output reg [WIDTH-1:0] dout);
localparam SLICE = WIDTH/(SELW**2);
always @(posedge clk) begin
dout[(WIDTH-ctrl*sel)-:SLICE] <= din;
end
endmodule

74
tests/various/dynamic_part_select/reversed_gate.v Normal file
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@ -0,0 +1,74 @@
module reversed_gate (clk, ctrl, din, sel, dout);
input clk;
input [4:0] ctrl;
input [15:0] din;
input [3:0] sel;
output reg [31:0] dout;
always @(posedge clk)
case ((({(32)-((ctrl)*(sel))})+(1))-(2))
0:
dout[1:0] <= din;
1:
dout[2:1] <= din;
2:
dout[3:2] <= din;
3:
dout[4:3] <= din;
4:
dout[5:4] <= din;
5:
dout[6:5] <= din;
6:
dout[7:6] <= din;
7:
dout[8:7] <= din;
8:
dout[9:8] <= din;
9:
dout[10:9] <= din;
10:
dout[11:10] <= din;
11:
dout[12:11] <= din;
12:
dout[13:12] <= din;
13:
dout[14:13] <= din;
14:
dout[15:14] <= din;
15:
dout[16:15] <= din;
16:
dout[17:16] <= din;
17:
dout[18:17] <= din;
18:
dout[19:18] <= din;
19:
dout[20:19] <= din;
20:
dout[21:20] <= din;
21:
dout[22:21] <= din;
22:
dout[23:22] <= din;
23:
dout[24:23] <= din;
24:
dout[25:24] <= din;
25:
dout[26:25] <= din;
26:
dout[27:26] <= din;
27:
dout[28:27] <= din;
28:
dout[29:28] <= din;
29:
dout[30:29] <= din;
30:
dout[31:30] <= din;
31:
dout[31:31] <= din;
endcase
endmodule