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support LE and LT comparators.

This commit is contained in:
steve 2001-06-15 05:01:09 +00:00
parent b3a5a0e5ab
commit ff0b59ff6b
1 changed files with 41 additions and 3 deletions
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44
t-dll.cc
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@ -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.cc,v 1.46 2001/06/15 04:14:19 steve Exp $"
#ident "$Id: t-dll.cc,v 1.47 2001/06/15 05:01:09 steve Exp $"
#endif
# include "compiler.h"
@ -673,6 +673,11 @@ void dll_target::lpm_add_sub(const NetAddSub*net)
scope_add_lpm(obj->scope, obj);
}
/*
* Make out of the NetCompare object an ivl_lpm_s object. The
* comparators in ivl_target do not support < or <=, but they can be
* trivially converted to > and >= by swapping the operands.
*/
void dll_target::lpm_compare(const NetCompare*net)
{
ivl_lpm_t obj = new struct ivl_lpm_s;
@ -681,6 +686,8 @@ void dll_target::lpm_compare(const NetCompare*net)
obj->scope = find_scope(des_.root_, net->scope());
assert(obj->scope);
bool swap_operands = false;
obj->u_.arith.width = net->width();
obj->u_.arith.q = new ivl_nexus_t[1 + 2 * obj->u_.arith.width];
@ -705,6 +712,28 @@ void dll_target::lpm_compare(const NetCompare*net)
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
} else if (net->pin_ALEB().is_linked()) {
const Nexus*nex = net->pin_ALEB().nexus();
obj->type = IVL_LPM_CMP_GE;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
swap_operands = true;
} else if (net->pin_ALB().is_linked()) {
const Nexus*nex = net->pin_ALB().nexus();
obj->type = IVL_LPM_CMP_GT;
assert(nex->t_cookie());
obj->u_.arith.q[0] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.q[0], obj, 0,
IVL_DR_STRONG, IVL_DR_STRONG);
swap_operands = true;
} else {
assert(0);
}
@ -712,14 +741,20 @@ void dll_target::lpm_compare(const NetCompare*net)
for (unsigned idx = 0 ; idx < net->width() ; idx += 1) {
const Nexus*nex;
nex = net->pin_DataA(idx).nexus();
nex = swap_operands
? net->pin_DataB(idx).nexus()
: net->pin_DataA(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.a[idx] = (ivl_nexus_t) nex->t_cookie();
nexus_lpm_add(obj->u_.arith.a[idx], obj, 0,
IVL_DR_HiZ, IVL_DR_HiZ);
nex = net->pin_DataB(idx).nexus();
nex = swap_operands
? net->pin_DataA(idx).nexus()
: net->pin_DataB(idx).nexus();
assert(nex->t_cookie());
obj->u_.arith.b[idx] = (ivl_nexus_t) nex->t_cookie();
@ -1145,6 +1180,9 @@ extern const struct target tgt_dll = { "dll", &dll_target_obj };
/*
* $Log: t-dll.cc,v $
* Revision 1.47 2001/06/15 05:01:09 steve
* support LE and LT comparators.
*
* Revision 1.46 2001/06/15 04:14:19 steve
* Generate vvp code for GT and GE comparisons.
*