/*
* Unable to convert to OREG (notoff() returned failure). Output
* suitable instructions to replace OREG.
*/
void
myormake(NODE *q)
{
NODE *p;
if (x2debug)
printf("myormake(%p)\n", q);
p = q->n_left;
/*
* This handles failed OREGs conversions, due to the offset
* being too large for an OREG.
*/
if ((p->n_op == PLUS || p->n_op == MINUS) && p->n_right->n_op == ICON) {
if (isreg(p->n_left) == 0)
(void)geninsn(p->n_left, INAREG);
if (isreg(p->n_right) == 0)
(void)geninsn(p->n_right, INAREG);
(void)geninsn(p, INAREG);
} else if (p->n_op == REG) {
q->n_op = OREG;
q->n_lval = p->n_lval;
q->n_rval = p->n_rval;
tfree(p);
}
}
/* setup for assignment operator */
int
setasg(NODE *p, int cookie)
{
if (x2debug)
printf("setasg(%p,%s)\n", p, prcook(cookie));
if (p->n_left->n_op == FLD && !isreg(p->n_left->n_left)) {
NODE *l, *r;
int reg;
geninsn(p->n_left->n_left, INAREG);
reg = DECRA(p->n_left->n_left->n_reg, 0);
l = tcopy(p->n_left->n_left);
p->n_left->n_left->n_op = REG;
p->n_left->n_left->n_rval = reg;
p->n_left->n_left->n_lval = 0;
r = tcopy(p->n_left->n_left);
geninsn(p->n_left, INAREG);
l = mkbinode(ASSIGN, l, r, l->n_type);
geninsn(l, INAREG);
return (1);
}
return (0);
}
/*
* Turn a UMUL-referenced node into OREG.
* Be careful about register classes, this is a place where classes change.
*/
void
offstar(NODE *p, int shape)
{
NODE *r;
if (x2debug)
printf("offstar(%p)\n", p);
if (isreg(p))
return; /* Is already OREG */
r = p->n_right;
if( p->n_op == PLUS || p->n_op == MINUS ){
if( r->n_op == ICON ){
if (isreg(p->n_left) == 0)
(void)geninsn(p->n_left, INAREG);
/* Converted in ormake() */
return;
}
if (r->n_op == LS && r->n_right->n_op == ICON &&
getlval(r->n_right) == 2 && p->n_op == PLUS) {
if (isreg(p->n_left) == 0)
(void)geninsn(p->n_left, INAREG);
if (isreg(r->n_left) == 0)
(void)geninsn(r->n_left, INAREG);
return;
}
}
(void)geninsn(p, INAREG);
}
/*
* Turn a UMUL-referenced node into OREG.
* Be careful about register classes, this is a place where classes change.
*/
void
offstar(NODE *p, int shape)
{
if (x2debug)
printf("offstar(%p)\n", p);
if (isreg(p))
return; /* Is already OREG */
if (p->n_op == UMUL)
p = p->n_left; /* double indexed umul */
if (inctree(p)) /* Do post-inc conversion */
return;
if( p->n_op == PLUS || p->n_op == MINUS ){
if (p->n_right->n_op == ICON) {
if (isreg(p->n_left) == 0)
(void)geninsn(p->n_left, INAREG);
/* Converted in ormake() */
return;
}
}
(void)geninsn(p, INAREG);
}
/*
* Turn a UMUL-referenced node into OREG.
*/
void
offstar(NODE *p, int shape)
{
if (x2debug)
printf("offstar(%p)\n", p);
if (p->n_op == PLUS || p->n_op == MINUS) {
if (p->n_right->n_op == ICON) {
if (isreg(p->n_left) == 0)
(void)geninsn(p->n_left, INAREG);
/* Converted in ormake() */
return;
}
}
(void)geninsn(p, INAREG);
}
/*
* Convert a node to REG or OREG.
* Shape is register class where we want the result.
* Returns register class if register nodes.
* If w is: (should be shapes)
* - SRREG - result in register, call geninsn().
* - SROREG - create OREG; call offstar().
* - 0 - clear su, walk down.
*/
static int
swmatch(NODE *p, int shape, int w)
{
int rv = 0;
F2DEBUG(("swmatch: p=%p, shape=%s, w=%s\n", p, prcook(shape), srtyp[w]));
switch (w) {
case SRREG:
rv = geninsn(p, shape);
break;
case SROREG:
/* should be here only if op == UMUL */
if (p->n_op != UMUL && p->n_op != FLD)
comperr("swmatch %p", p);
if (p->n_op == FLD) {
offstar(p->n_left->n_left, shape);
p->n_left->n_su = 0;
} else
offstar(p->n_left, shape);
p->n_su = 0;
rv = ffs(shape)-1;
break;
case 0:
if (optype(p->n_op) == BITYPE)
swmatch(p->n_right, 0, 0);
if (optype(p->n_op) != LTYPE)
swmatch(p->n_left, 0, 0);
p->n_su = 0;
}
return rv;
}
/*
* Turn a UMUL-referenced node into OREG.
* Be careful about register classes, this is a place where classes change.
*
* AMD64 (and i386) have a quite powerful addressing scheme:
* : 4(%rax) 4 + %rax
* : 4(%rbx,%rax,8) 4 + %rbx + %rax * 8
* : 4(,%rax) 4 + %rax * 8
* The 8 above can be 1,2,4 or 8.
*/
void
offstar(NODE *p, int shape)
{
NODE *l;
if (x2debug) {
printf("offstar(%p)\n", p);
fwalk(p, e2print, 0);
}
if (isreg(p))
return; /* Matched (%rax) */
if (findls(p, 0))
return; /* Matched (,%rax,8) */
if ((p->n_op == PLUS || p->n_op == MINUS) && p->n_left->n_op == ICON) {
l = p->n_right;
if (isreg(l))
return; /* Matched 4(%rax) */
if (findls(l, 0))
return; /* Matched 4(,%rax,8) */
if (l->n_op == PLUS && isreg(l->n_right)) {
if (findls(l->n_left, 0))
return; /* Matched 4(%rbx,%rax,8) */
(void)geninsn(l->n_left, INAREG);
return; /* Generate 4(%rbx,%rax) */
}
(void)geninsn(l, INAREG);
return; /* Generate 4(%rbx) */
}
if (p->n_op == PLUS) {
if (!isreg(p->n_left)) /* ensure right is REG */
(void)geninsn(p->n_left, INAREG);
if (isreg(p->n_right))
return; /* Matched (%rax,%rbx) */
if (findls(p->n_right, 0))
return; /* Matched (%rax,%rbx,4) */
(void)geninsn(p->n_right, INAREG);
return; /* Generate (%rbx,%rax) */
}
(void)geninsn(p, INAREG);
}
void
offstar(NODE *p, int shape)
{
NODE *q;
if (x2debug)
printf("offstar(%p)\n", p);
if( p->n_op == PLUS || p->n_op == MINUS ){
if( p->n_right->n_op == ICON ){
q = p->n_left;
if (q->n_op != REG)
geninsn(q, INAREG);
p->n_su = -1;
}
}
geninsn(p, INAREG);
}
/*
* Turn a UMUL-referenced node into OREG.
* Be careful about register classes, this is a place where classes change.
*/
void
offstar(NODE *p, int shape)
{
NODE *r;
if (x2debug)
printf("offstar(%p)\n", p);
if (isreg(p))
return; /* Is already OREG */
r = p->n_right;
if( p->n_op == PLUS || p->n_op == MINUS ){
if( r->n_op == ICON ){
if (isreg(p->n_left) == 0 ||
(p->n_left->n_op == REG &&
p->n_left->n_rval != 2 && p->n_left->n_rval != 3))
(void)geninsn(p->n_left, INBREG);
/* Converted in ormake() */
return;
}
}
(void)geninsn(p, INBREG);
}
/*
* Check if LS and try to make it indexable.
* Ignore SCONV to long.
* Return 0 if failed.
*/
static int
findls(NODE *p, int check)
{
CONSZ c;
if (p->n_op == SCONV && p->n_type == LONG && p->n_left->n_type == INT)
p = p->n_left; /* Ignore pointless SCONVs here */
if (p->n_op != LS || p->n_right->n_op != ICON)
return 0;
if ((c = p->n_right->n_lval) != 1 && c != 2 && c != 3)
return 0;
if (check == 1 && p->n_left->n_op != REG)
return 0;
if (!isreg(p->n_left))
(void)geninsn(p->n_left, INAREG);
return 1;
}