cc_t compute_cc(alu_t op, word_t argA, word_t argB)
{
word_t val = compute_alu(op, argA, argB);
bool_t zero = (val == 0);
bool_t sign = ((int)val < 0);
bool_t ovf;
switch(op) {
case A_ADD:
ovf = (((int)argA < 0) == ((int)argB < 0)) &&
(((int)val < 0) != ((int)argA < 0));
break;
case A_SUB:
ovf = (((int)argA > 0) == ((int)argB < 0)) &&
(((int)val < 0) != ((int)argB < 0));
break;
/* JB inutile
case A_AND:
case A_XOR:
ovf = FALSE;
break;
*/
default:
ovf = FALSE;
}
return PACK_CC(zero,sign,ovf);
}
/*
* compute_cc: modify condition codes according to operations
* args
* op: operations (A_ADD, A_SUB, A_AND, A_XOR)
* argA: the first argument
* argB: the second argument
* val: the result of operation on argA and argB
*
* return
* PACK_CC: the final condition codes
*/
cc_t compute_cc(alu_t op, long_t argA, long_t argB, long_t val)
{
bool_t zero = (val == 0);
bool_t sign = (val < 0);
bool_t ovf = FALSE;
switch (op) {
case 0: ovf = (argA<0 == argB<0) && (val<0 != argB<0); break;
case 1: ovf = (argA>0 == argB<0) && (val<0 != argB<0); break;
}
return PACK_CC(zero,sign,ovf);
}
/*
* compute_cc: modify condition codes according to operations
* args
* op: operations (A_ADD, A_SUB, A_AND, A_XOR)
* argA: the first argument
* argB: the second argument
* val: the result of operation on argA and argB
*
* return
* PACK_CC: the final condition codes
*/
cc_t compute_cc(alu_t op, long_t argA, long_t argB, long_t val)
{
bool_t zero = (val == 0);
bool_t ovf = FALSE;
bool_t sign = (val < 0);
if(op == A_ADD){
ovf = ((argA > 0) == (argB > 0))&&
((argA > 0) != (val > 0));
}else if(op == A_SUB){
ovf = ((argA > 0) == (argB < 0))&&
((argA > 0) != (val < 0));
}
return PACK_CC(zero,sign,ovf);
}
/*
* compute_cc: modify condition codes according to operations
* args
* op: operations (A_ADD, A_SUB, A_AND, A_XOR)
* argA: the first argument
* argB: the second argument
* val: the result of operation on argA and argB
*
* return
* PACK_CC: the final condition codes
*/
cc_t compute_cc(alu_t op, long_t argA, long_t argB, long_t val)
{
bool_t zero = FALSE;
bool_t sign = FALSE;
bool_t ovf = FALSE;
if (val==0)
zero = TRUE;
if (val<0)
sign = TRUE;
if (op==A_ADD)
if (((argA<0) == (argB<0)) && ((val<0) != (argA<0)))
ovf = TRUE;
if (op==A_SUB)
if (((argA<0)&&(argB>0)&&(val<0))||((argA>0)&&(argB<0)&&(val>0)))
ovf = TRUE;
if ((op==A_XOR)||(op==A_AND))
ovf = FALSE;
return PACK_CC(zero,sign,ovf);
}
