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Use addi with wide immediate values.

This commit is contained in:
steve 2002-05-30 01:57:23 +00:00
parent 19d817503d
commit 95876feb46
1 changed files with 43 additions and 4 deletions
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47
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 1.60 2002/05/29 16:29:34 steve Exp $"
#ident "$Id: eval_expr.c,v 1.61 2002/05/30 01:57:23 steve Exp $"
#endif
# include "vvp_priv.h"
@ -539,6 +539,21 @@ static struct vector_info draw_binary_expr_lrs(ivl_expr_t exp, unsigned wid)
return lv;
}
static int number_is_unknown(ivl_expr_t ex)
{
const char*bits;
unsigned idx;
assert(ivl_expr_type(ex) == IVL_EX_NUMBER);
bits = ivl_expr_bits(ex);
for (idx = 0 ; idx < ivl_expr_width(ex) ; idx += 1)
if ((bits[idx] != '0') && (bits[idx] != '1'))
return 1;
return 0;
}
static struct vector_info draw_add_immediate(ivl_expr_t le,
ivl_expr_t re,
unsigned wid)
@ -574,8 +589,27 @@ static struct vector_info draw_add_immediate(ivl_expr_t le,
assert(0);
}
assert(0 == (imm & ~0xffffUL));
fprintf(vvp_out, " %%addi %u, %lu, %u;\n", lv.base, imm, wid);
/* Now generate enough %addi instructions to add the entire
immediate value to the destination. The adds are done 16
bits at a time, but 17 bits are done to push the carry into
the higher bits if needed. */
{ unsigned base;
for (base = 0 ; base < lv.wid ; base += 16) {
unsigned long tmp = imm & 0xffffUL;
unsigned add_wid = lv.wid - base;
imm >>= 16;
if ((imm != 0) && (add_wid > 17))
add_wid = 17;
fprintf(vvp_out, " %%addi %u, %lu, %u;\n",
lv.base+base, tmp, add_wid);
if (imm == 0)
break;
}
}
return lv;
}
@ -594,7 +628,9 @@ static struct vector_info draw_binary_expr_arith(ivl_expr_t exp, unsigned wid)
return draw_add_immediate(le, re, wid);
if ((ivl_expr_opcode(exp) == '+')
&& (ivl_expr_type(re) == IVL_EX_NUMBER))
&& (ivl_expr_type(re) == IVL_EX_NUMBER)
&& (ivl_expr_width(re) <= 8 * sizeof(unsigned long))
&& (! number_is_unknown(re)))
return draw_add_immediate(le, re, wid);
lv = draw_eval_expr_wid(le, wid);
@ -1559,6 +1595,9 @@ struct vector_info draw_eval_expr(ivl_expr_t exp)
/*
* $Log: eval_expr.c,v $
* Revision 1.61 2002/05/30 01:57:23 steve
* Use addi with wide immediate values.
*
* Revision 1.60 2002/05/29 16:29:34 steve
* Add %addi, which is faster to simulate.
*