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Better reuse of IVL_EX_SELECT expressions.

This commit is contained in:
steve 2005-09-15 02:49:47 +00:00
parent 293976bacc
commit 14d79a655e
1 changed files with 25 additions and 4 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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/ */
#ifdef HAVE_CVS_IDENT #ifdef HAVE_CVS_IDENT
#ident "$Id: eval_expr.c,v 1.120 2005/09/14 02:53:15 steve Exp $" #ident "$Id: eval_expr.c,v 1.121 2005/09/15 02:49:47 steve Exp $"
#endif #endif
# include "vvp_priv.h" # include "vvp_priv.h"
@ -1649,8 +1649,23 @@ static struct vector_info draw_select_expr(ivl_expr_t exp, unsigned wid)
ivl_expr_t sube = ivl_expr_oper1(exp); ivl_expr_t sube = ivl_expr_oper1(exp);
ivl_expr_t shift = ivl_expr_oper2(exp); ivl_expr_t shift = ivl_expr_oper2(exp);
if (ivl_expr_type(sube) == IVL_EX_SIGNAL) /* First look for the self expression in the lookaside, and
return draw_select_signal(sube, shift, wid); allocate that if possible. If I find it, then immediatly
return that. */
if ( (res.base = allocate_vector_exp(exp, wid)) != 0) {
fprintf(vvp_out, "; Reuse base=%u wid=%u from lookaside.\n",
res.base, wid);
res.wid = wid;
return res;
}
if (ivl_expr_type(sube) == IVL_EX_SIGNAL) {
res = draw_select_signal(sube, shift, wid);
fprintf(vvp_out, "; Save base=%u wid=%u in lookaside.\n",
res.base, wid);
save_expression_lookaside(res.base, exp, wid);
return res;
}
/* Evaluate the sub-expression. */ /* Evaluate the sub-expression. */
subv = draw_eval_expr(sube, 0); subv = draw_eval_expr(sube, 0);
@ -1703,8 +1718,11 @@ static struct vector_info draw_select_expr(ivl_expr_t exp, unsigned wid)
res = subv; res = subv;
} }
if (res.base >= 8) if (res.base >= 8) {
fprintf(vvp_out, "; Save expression base=%u wid=%u in lookaside\n",
res.base, wid);
save_expression_lookaside(res.base, exp, wid); save_expression_lookaside(res.base, exp, wid);
}
return res; return res;
} }
@ -2099,6 +2117,9 @@ struct vector_info draw_eval_expr(ivl_expr_t exp, int stuff_ok_flag)
/* /*
* $Log: eval_expr.c,v $ * $Log: eval_expr.c,v $
* Revision 1.121 2005/09/15 02:49:47 steve
* Better reuse of IVL_EX_SELECT expressions.
*
* Revision 1.120 2005/09/14 02:53:15 steve * Revision 1.120 2005/09/14 02:53:15 steve
* Support bool expressions and compares handle them optimally. * Support bool expressions and compares handle them optimally.
* *