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Generate code for unary minus (PR#272)

This commit is contained in:
steve 2001-09-29 04:37:44 +00:00
parent d46465845c
commit bdf643ddb1
1 changed files with 28 additions and 1 deletions
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29
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
*/
#if !defined(WINNT)
#ident "$Id: eval_expr.c,v 1.46 2001/09/29 01:53:22 steve Exp $"
#ident "$Id: eval_expr.c,v 1.47 2001/09/29 04:37:44 steve Exp $"
#endif
# include "vvp_priv.h"
@ -1119,6 +1119,30 @@ static struct vector_info draw_unary_expr(ivl_expr_t exp, unsigned wid)
}
break;
case '-':
/* Unary minus is implemented by generating the 2's
complement of the number. That is the 1's complement
(bitwise invert) with a 1 added in. Note that the
%sub subtracts -1 (1111...) to get %add of +1. */
res = draw_eval_expr_wid(sub, wid);
switch (res.base) {
case 0:
res.base = 0;
break;
case 1:
res.base = 1;
break;
case 2:
case 3:
res.base = 2;
break;
default:
fprintf(vvp_out, " %%inv %u, %u;\n", res.base, res.wid);
fprintf(vvp_out, " %%sub %u, 1, %u;\n",res.base,res.wid);
break;
}
break;
case '!':
case 'N':
case 'A':
@ -1228,6 +1252,9 @@ struct vector_info draw_eval_expr(ivl_expr_t exp)
/*
* $Log: eval_expr.c,v $
* Revision 1.47 2001/09/29 04:37:44 steve
* Generate code for unary minus (PR#272)
*
* Revision 1.46 2001/09/29 01:53:22 steve
* Fix the size of unsized constant operants to compare (PR#274)
*