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Normalize run-time index expressions for bit selects

This commit is contained in:
steve 2002-06-16 20:39:12 +00:00
parent df0b81d94d
commit b4b5ac9944
3 changed files with 48 additions and 5 deletions
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34
t-dll-expr.cc
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) & !defined(macintosh)
#ident "$Id: t-dll-expr.cc,v 1.25 2002/06/16 19:19:16 steve Exp $"
#ident "$Id: t-dll-expr.cc,v 1.26 2002/06/16 20:39:12 steve Exp $"
#endif
# include "config.h"
@ -73,6 +73,35 @@ void dll_target::sub_off_from_expr_(long off)
expr_ = tmps;
}
void dll_target::mul_expr_by_const_(long val)
{
assert(expr_ != 0);
char*bits;
ivl_expr_t tmpc = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
tmpc->type_ = IVL_EX_NUMBER;
tmpc->width_ = expr_->width_;
tmpc->signed_ = expr_->signed_;
tmpc->u_.number_.bits_ = bits = (char*)malloc(tmpc->width_);
for (unsigned idx = 0 ; idx < tmpc->width_ ; idx += 1) {
bits[idx] = (val & 1)? '1' : '0';
val >>= 1;
}
/* Now make the subtractor (x-4 in the above example)
that has as input A the index expression and input B
the constant to subtract. */
ivl_expr_t tmps = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
tmps->type_ = IVL_EX_BINARY;
tmps->width_ = tmpc->width_;
tmps->signed_ = tmpc->signed_;
tmps->u_.binary_.op_ = '*';
tmps->u_.binary_.lef_ = expr_;
tmps->u_.binary_.rig_ = tmpc;
/* Replace (x) with (x*valf) */
expr_ = tmps;
}
void dll_target::expr_binary(const NetEBinary*net)
{
@ -429,6 +458,9 @@ void dll_target::expr_unary(const NetEUnary*net)
/*
* $Log: t-dll-expr.cc,v $
* Revision 1.26 2002/06/16 20:39:12 steve
* Normalize run-time index expressions for bit selects
*
* Revision 1.25 2002/06/16 19:19:16 steve
* Generate runtime code to normalize indices.
*

13
t-dll-proc.cc
View File

@ -18,7 +18,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: t-dll-proc.cc,v 1.48 2002/06/16 19:19:16 steve Exp $"
#ident "$Id: t-dll-proc.cc,v 1.49 2002/06/16 20:39:12 steve Exp $"
#endif
# include "config.h"
@ -153,8 +153,10 @@ void dll_target::proc_assign(const NetAssign*net)
assert(expr_ == 0);
asn->bmux()->expr_scan(this);
if (asn->sig()->lsb() != 0)
if (cur->n.sig->lsb_index != 0)
sub_off_from_expr_(asn->sig()->lsb());
if (cur->n.sig->lsb_dist != 1)
mul_expr_by_const_(cur->n.sig->lsb_dist);
cur->type_ = IVL_LVAL_MUX;
cur->idx = expr_;
@ -218,8 +220,10 @@ void dll_target::proc_assign_nb(const NetAssignNB*net)
assert(expr_ == 0);
asn->bmux()->expr_scan(this);
if (asn->sig()->lsb() != 0)
if (cur->n.sig->lsb_index != 0)
sub_off_from_expr_(asn->sig()->lsb());
if (cur->n.sig->lsb_dist != 1)
mul_expr_by_const_(cur->n.sig->lsb_dist);
cur->type_ = IVL_LVAL_MUX;
cur->idx = expr_;
@ -782,6 +786,9 @@ void dll_target::proc_while(const NetWhile*net)
/*
* $Log: t-dll-proc.cc,v $
* Revision 1.49 2002/06/16 20:39:12 steve
* Normalize run-time index expressions for bit selects
*
* Revision 1.48 2002/06/16 19:19:16 steve
* Generate runtime code to normalize indices.
*

6
t-dll.h
View File

@ -19,7 +19,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: t-dll.h,v 1.84 2002/06/16 19:19:16 steve Exp $"
#ident "$Id: t-dll.h,v 1.85 2002/06/16 20:39:12 steve Exp $"
#endif
# include "target.h"
@ -149,6 +149,7 @@ struct dll_target : public target_t, public expr_scan_t {
void add_root(ivl_design_s &des_, const NetScope *s);
void sub_off_from_expr_(long);
void mul_expr_by_const_(long);
};
/*
@ -608,6 +609,9 @@ struct ivl_statement_s {
/*
* $Log: t-dll.h,v $
* Revision 1.85 2002/06/16 20:39:12 steve
* Normalize run-time index expressions for bit selects
*
* Revision 1.84 2002/06/16 19:19:16 steve
* Generate runtime code to normalize indices.
*