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Simplify blocking assignment 

Now generates 'wait for 0 ns' after non-blocking assignment
This commit is contained in:
Nick Gasson 2008-07-14 19:54:45 +01:00
parent f84f50842c
commit d22c9a8b05
2 changed files with 23 additions and 6 deletions
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25
tgt-vhdl/stmt.cc
View File

@ -163,7 +163,7 @@ static T *make_vhdl_assignment(vhdl_procedural *proc, stmt_container *container,
decl->set_initial(rhs); decl->set_initial(rhs);
if (blocking && proc->get_scope()->allow_signal_assignment()) { /*if (blocking && proc->get_scope()->allow_signal_assignment()) {
// This signal may be used e.g. in a loop test so we need // This signal may be used e.g. in a loop test so we need
// to make a variable as well // to make a variable as well
blocking_assign_to(proc, sig); blocking_assign_to(proc, sig);
@ -182,18 +182,18 @@ static T *make_vhdl_assignment(vhdl_procedural *proc, stmt_container *container,
return a; return a;
} }
else else*/
return NULL; // No statement need be emitted return NULL; // No statement need be emitted
} }
else { else {
if (blocking && proc->get_scope()->allow_signal_assignment()) { /*if (blocking && proc->get_scope()->allow_signal_assignment()) {
// Remember we need to write the variable back to the // Remember we need to write the variable back to the
// original signal // original signal
blocking_assign_to(proc, sig); blocking_assign_to(proc, sig);
// The signal may have been renamed by the above call // The signal may have been renamed by the above call
signame = get_renamed_signal(sig); signame = get_renamed_signal(sig);
} }*/
vhdl_type *ltype = vhdl_type *ltype =
new vhdl_type(*proc->get_scope()->get_decl(signame)->get_type()); new vhdl_type(*proc->get_scope()->get_decl(signame)->get_type());
@ -292,7 +292,24 @@ static int draw_nbassign(vhdl_procedural *proc, stmt_container *container,
static int draw_assign(vhdl_procedural *proc, stmt_container *container, static int draw_assign(vhdl_procedural *proc, stmt_container *container,
ivl_statement_t stmt) ivl_statement_t stmt)
{ {
if (proc->get_scope()->allow_signal_assignment()) {
// TODO: Explain blocking assignment here
vhdl_nbassign_stmt *a =
make_assignment<vhdl_nbassign_stmt>(proc, container, stmt, false);
if (a != NULL) {
// Assignment is a statement and not moved into the initialisation
//if (after != NULL)
// a->set_after(after);
container->add_stmt
(new vhdl_wait_stmt(VHDL_WAIT_FOR, new vhdl_const_time(0)));
}
}
else
make_assignment<vhdl_assign_stmt>(proc, container, stmt, true); make_assignment<vhdl_assign_stmt>(proc, container, stmt, true);
return 0; return 0;
} }

2
tgt-vhdl/vhdl_syntax.hh
View File

@ -158,7 +158,7 @@ enum time_unit_t {
class vhdl_const_time : public vhdl_expr { class vhdl_const_time : public vhdl_expr {
public: public:
vhdl_const_time(int64_t value, time_unit_t units) vhdl_const_time(int64_t value, time_unit_t units = TIME_UNIT_NS)
: vhdl_expr(vhdl_type::time(), true), value_(value), units_(units) {} : vhdl_expr(vhdl_type::time(), true), value_(value), units_(units) {}
void emit(std::ostream &of, int level) const; void emit(std::ostream &of, int level) const;
private: private: