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AND handles argument padding if necessary.

This commit is contained in:
steve 2000-04-26 03:32:40 +00:00
parent 72c8897d13
commit e78af393de
1 changed files with 17 additions and 4 deletions
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21
vvm/vvm_func.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) && !defined(macintosh) #if !defined(WINNT) && !defined(macintosh)
#ident "$Id: vvm_func.cc,v 1.6 2000/03/26 16:55:41 steve Exp $" #ident "$Id: vvm_func.cc,v 1.7 2000/04/26 03:32:40 steve Exp $"
#endif #endif
# include "vvm_func.h" # include "vvm_func.h"
@ -93,12 +93,22 @@ vpip_bit_t vvm_unop_xnor(const vvm_bitset_t&r)
return B_NOT(v); return B_NOT(v);
} }
/*
* Do a bitwise AND into the result. We only need to calculate enough
* bits to fill the result. If I need to extend either value, extend
* it with St0.
*/
void vvm_binop_and(vvm_bitset_t&v, const vvm_bitset_t&l, const vvm_bitset_t&r) void vvm_binop_and(vvm_bitset_t&v, const vvm_bitset_t&l, const vvm_bitset_t&r)
{ {
assert(v.nbits == l.nbits); unsigned min = v.nbits;
assert(v.nbits == r.nbits); if (r.nbits < min) min = r.nbits;
for (unsigned idx = 0 ; idx < v.nbits ; idx += 1) if (l.nbits < min) min = l.nbits;
for (unsigned idx = 0 ; idx < min ; idx += 1)
v[idx] = B_AND(l[idx], r[idx]); v[idx] = B_AND(l[idx], r[idx]);
for (unsigned idx = min ; idx < v.nbits ; idx += 1)
v[idx] = St0;
} }
void vvm_binop_minus(vvm_bitset_t&v, const vvm_bitset_t&l, void vvm_binop_minus(vvm_bitset_t&v, const vvm_bitset_t&l,
@ -486,6 +496,9 @@ void vvm_ternary(vvm_bitset_t&v, vpip_bit_t c,
/* /*
* $Log: vvm_func.cc,v $ * $Log: vvm_func.cc,v $
* Revision 1.7 2000/04/26 03:32:40 steve
* AND handles argument padding if necessary.
*
* Revision 1.6 2000/03/26 16:55:41 steve * Revision 1.6 2000/03/26 16:55:41 steve
* Remove the vvm_bits_t abstract class. * Remove the vvm_bits_t abstract class.
* *