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Comparisons cant leave their results in the opcode 

result area or their values will be clobbered by other
 parts of a complex expression.
This commit is contained in:
steve 2001-05-01 02:07:34 +00:00
parent 8b4befd4fc
commit 3e3757bde7
1 changed files with 36 additions and 3 deletions
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39
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 1.21 2001/04/30 05:11:18 steve Exp $"
#ident "$Id: eval_expr.c,v 1.22 2001/05/01 02:07:34 steve Exp $"
#endif
# include "vvp_priv.h"
@ -48,9 +48,21 @@ static inline void clr_bit(unsigned addr)
allocation_map[addr] &= ~(1 << bit);
}
/*
* This clears a vector that was previously allocated by
* allocate_vector. That is, it unmarks all the bits of the map that
* represent this vector.
*
* If the vector is based in one of 4 constant bit values, then there
* are no bits to clear. If the vector is based in the 4-8 result
* area, then someone is broken.
*/
void clr_vector(struct vector_info vec)
{
unsigned idx;
if (vec.base < 4)
return;
assert(vec.base >= 8);
for (idx = 0 ; idx < vec.wid ; idx += 1)
clr_bit(vec.base + idx);
}
@ -142,6 +154,15 @@ static struct vector_info draw_binary_expr_eq(ivl_expr_t exp)
assert(0);
}
/* Move the result out out the 4-7 bit that the compare
uses. This is because that bit may be clobbered by other
expressions. */
{ unsigned short base = allocate_vector(1);
fprintf(vvp_out, " %%mov %u, %u, 1;\n", base, lv.base);
lv.base = base;
lv.wid = 1;
}
return lv;
}
@ -284,8 +305,15 @@ static struct vector_info draw_binary_expr_le(ivl_expr_t exp, unsigned wid)
clr_vector(lv);
clr_vector(rv);
lv.base = 5;
lv.wid = 1;
/* Move the result out out the 4-7 bit that the compare
uses. This is because that bit may be clobbered by other
expressions. */
{ unsigned short base = allocate_vector(1);
fprintf(vvp_out, " %%mov %u, 5, 1;\n", base);
lv.base = base;
lv.wid = 1;
}
assert(wid == 1);
return lv;
@ -855,6 +883,11 @@ struct vector_info draw_eval_expr(ivl_expr_t exp)
/*
* $Log: eval_expr.c,v $
* Revision 1.22 2001/05/01 02:07:34 steve
* Comparisons cant leave their results in the opcode
* result area or their values will be clobbered by other
* parts of a complex expression.
*
* Revision 1.21 2001/04/30 05:11:18 steve
* OR is %or. Get this right.
*