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Handle truncation/padding of numbers.

This commit is contained in:
steve 2001-03-29 05:16:25 +00:00
parent 966f7a4bff
commit f6eb581aff
1 changed files with 15 additions and 5 deletions
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20
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 1.4 2001/03/29 02:52:39 steve Exp $"
#ident "$Id: eval_expr.c,v 1.5 2001/03/29 05:16:25 steve Exp $"
#endif
# include "vvp_priv.h"
@ -172,23 +172,26 @@ static struct vector_info draw_binary_expr(ivl_expr_t exp, unsigned wid)
static struct vector_info draw_number_expr(ivl_expr_t exp, unsigned wid)
{
unsigned idx;
unsigned nwid;
struct vector_info res;
const char*bits = ivl_expr_bits(exp);
res.wid = wid;
assert(ivl_expr_width(exp) >= wid);
nwid = wid;
if (ivl_expr_width(exp) < nwid)
nwid = ivl_expr_width(exp);
/* If all the bits of the number have the same value, then we
can use a constant bit. There is no need to allocate wr
bits, and there is no need to generate any code. */
for (idx = 1 ; idx < res.wid ; idx += 1) {
for (idx = 1 ; idx < nwid ; idx += 1) {
if (bits[idx] != bits[0])
break;
}
if (idx == res.wid) {
if (idx >= res.wid) {
switch (bits[0]) {
case '0':
res.base = 0;
@ -212,7 +215,7 @@ static struct vector_info draw_number_expr(ivl_expr_t exp, unsigned wid)
res.base = allocate_vector(wid);
idx = 0;
while (idx < wid) {
while (idx < nwid) {
unsigned cnt;
char src = '?';
switch (bits[idx]) {
@ -240,6 +243,10 @@ static struct vector_info draw_number_expr(ivl_expr_t exp, unsigned wid)
idx += cnt;
}
/* Pad the number up to the expression width. */
if (idx < wid)
fprintf(vvp_out, " %%mov %u, 0, %u;\n", res.base+idx, wid-idx);
return res;
}
@ -326,6 +333,9 @@ struct vector_info draw_eval_expr(ivl_expr_t exp)
/*
* $Log: eval_expr.c,v $
* Revision 1.5 2001/03/29 05:16:25 steve
* Handle truncation/padding of numbers.
*
* Revision 1.4 2001/03/29 02:52:39 steve
* Add unary ~ operator to tgt-vvp.
*