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Generate code for repeat concatenations.

This commit is contained in:
steve 1999-09-28 01:53:37 +00:00
parent 6d7ac5d67b
commit a964e0479b
1 changed files with 29 additions and 12 deletions
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41
t-vvm.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/ */
#if !defined(WINNT) #if !defined(WINNT)
#ident "$Id: t-vvm.cc,v 1.47 1999/09/28 01:21:27 steve Exp $" #ident "$Id: t-vvm.cc,v 1.48 1999/09/28 01:53:37 steve Exp $"
#endif #endif
# include <iostream> # include <iostream>
@ -127,28 +127,42 @@ class vvm_proc_rval : public expr_scan_t {
virtual void expr_ufunc(const NetEUFunc*); virtual void expr_ufunc(const NetEUFunc*);
}; };
/*
* Handle the concatenation operator in a procedural r-value
* expression. Evaluate the concatenation into a temporary variable
* with the right width, and return the name of that temporary as the
* symbol that the context can use.
*/
void vvm_proc_rval::expr_concat(const NetEConcat*expr) void vvm_proc_rval::expr_concat(const NetEConcat*expr)
{ {
assert(expr->repeat() == 1); assert(expr->repeat() > 0);
string tname = make_temp(); string tname = make_temp();
os_ << setw(indent_) << "" << "vvm_bitset_t<" << os_ << setw(indent_) << "" << "vvm_bitset_t<" <<
expr->expr_width() << "> " << tname << ";" << endl; expr->expr_width() << "> " << tname << ";" << endl;
unsigned pos = 0; unsigned pos = 0;
for (unsigned idx = 0 ; idx < expr->nparms() ; idx += 1) { for (unsigned rep = 0 ; rep < expr->repeat() ; rep += 1)
for (unsigned idx = 0 ; idx < expr->nparms() ; idx += 1) {
NetExpr*pp = expr->parm(expr->nparms() - idx - 1); NetExpr*pp = expr->parm(expr->nparms() - idx - 1);
pp->expr_scan(this); pp->expr_scan(this);
for (unsigned bit = 0 ; bit < pp->expr_width() ; bit += 1) { for (unsigned bit = 0 ; bit < pp->expr_width() ; bit += 1) {
os_ << setw(indent_) << "" << tname << "[" << pos << os_ << setw(indent_) << "" << tname << "[" << pos <<
"] = " << result << "[" << bit << "];" << "] = " << result << "[" << bit << "];" <<
endl; endl;
pos+= 1; pos+= 1;
}
assert(pos <= expr->expr_width());
} }
assert(pos <= expr->expr_width());
/* Check that the positions came out to the right number of
bits. */
if (pos != expr->expr_width()) {
os_ << "#error \"" << expr->get_line() << ": vvm eror: "
"width is " << expr->expr_width() << ", but I count "
<< pos << " bits.\"" << endl;
} }
assert(pos == expr->expr_width());
result = tname; result = tname;
} }
@ -1486,6 +1500,9 @@ extern const struct target tgt_vvm = {
}; };
/* /*
* $Log: t-vvm.cc,v $ * $Log: t-vvm.cc,v $
* Revision 1.48 1999/09/28 01:53:37 steve
* Generate code for repeat concatenations.
*
* Revision 1.47 1999/09/28 01:21:27 steve * Revision 1.47 1999/09/28 01:21:27 steve
* Proper syntax for method pointers. * Proper syntax for method pointers.
* *