luke
/
iverilog
mirror of https://github.com/steveicarus/iverilog.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Proper compile time processing of arithmetic right shift 

Handle arithmetic right shift during compile time. This comes
up with both the operands are constant expressions. the compiler
is able to evaluate this down to a constant to replace the
expression.

Signed-off-by: Stephen Williams <steve@icarus.com>
This commit is contained in:
Stephen Williams 2007-11-08 21:52:38 -08:00
parent 05a6e69d2d
commit bab9c7adba
2 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
eval_tree.cc
View File

@ -16,9 +16,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: eval_tree.cc,v 1.77 2007/06/02 03:42:12 steve Exp $"
#endif
# include "config.h"
# include "compiler.h"
@ -1075,9 +1072,13 @@ NetEConst* NetEBShift::eval_tree(int prune_to_width)
wid = prune_to_width;
assert(wid);
verinum nv (verinum::V0, wid, lv.has_len());
verinum::V pad = verinum::V0;
if (op() == 'R' && has_sign()) {
pad = lv[lv.len()-1];
}
verinum nv (pad, wid, lv.has_len());
if (op() == 'r') {
if (op() == 'r' || op() == 'R') {
unsigned cnt = wid;
if (cnt > nv.len())
cnt = nv.len();

6
pform_dump.cc
View File

@ -16,9 +16,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: pform_dump.cc,v 1.101 2007/06/04 02:19:07 steve Exp $"
#endif
# include "config.h"
@ -243,6 +240,9 @@ void PEBinary::dump(ostream&out) const
case 'N':
out << "!==";
break;
case 'R':
out << ">>>";
break;
case 'r':
out << ">>";
break;