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Special handling of constant shift 0.

This commit is contained in:
steve 2005-01-28 05:37:48 +00:00
parent a5b431ad20
commit 6be34bba4d
1 changed files with 15 additions and 1 deletions
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16
tgt-vvp/eval_expr.c
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: eval_expr.c,v 1.113 2005/01/24 05:28:31 steve Exp $"
#ident "$Id: eval_expr.c,v 1.114 2005/01/28 05:37:48 steve Exp $"
#endif
# include "vvp_priv.h"
@ -1570,6 +1570,17 @@ static struct vector_info draw_select_expr(ivl_expr_t exp, unsigned wid)
/* Evaluate the bit select base expression and store the
result into index register 0. */
shiv = draw_eval_expr(shift, STUFF_OK_XZ);
/* Detect and handle the special case that the shift is a
constant 0. Skip the shift, and return the subexpression
with the width trimmed down to the desired width. */
if (shiv.base == 0) {
assert(subv.wid >= wid);
res.base = subv.base;
res.wid = wid;
return res;
}
fprintf(vvp_out, " %%ix/get 0, %u, %u;\n", shiv.base, shiv.wid);
clr_vector(shiv);
@ -2088,6 +2099,9 @@ struct vector_info draw_eval_expr(ivl_expr_t exp, int stuff_ok_flag)
/*
* $Log: eval_expr.c,v $
* Revision 1.114 2005/01/28 05:37:48 steve
* Special handling of constant shift 0.
*
* Revision 1.113 2005/01/24 05:28:31 steve
* Remove the NetEBitSel and combine all bit/part select
* behavior into the NetESelect node and IVL_EX_SELECT