// Derived from Inferno utils/6c/reg.c
// http://code.google.com/p/inferno-os/source/browse/utils/6c/reg.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth ([email protected])
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth ([email protected])
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "gg.h"
#undef EXTERN
#define EXTERN
#include "opt.h"
#define P2R(p) (Reg*)(p->reg)
static int first = 1;
Reg*
rega(void)
{
Reg *r;
r = freer;
if(r == R) {
r = mal(sizeof(*r));
} else
freer = r->link;
*r = zreg;
return r;
}
int
rcmp(const void *a1, const void *a2)
{
Rgn *p1, *p2;
int c1, c2;
p1 = (Rgn*)a1;
p2 = (Rgn*)a2;
c1 = p2->cost;
c2 = p1->cost;
if(c1 -= c2)
return c1;
return p2->varno - p1->varno;
}
void
setoutvar(void)
{
Type *t;
Node *n;
Addr a;
Iter save;
Bits bit;
int z;
t = structfirst(&save, getoutarg(curfn->type));
while(t != T) {
n = nodarg(t, 1);
a = zprog.from;
naddr(n, &a, 0);
bit = mkvar(R, &a);
for(z=0; z<BITS; z++)
ovar.b[z] |= bit.b[z];
t = structnext(&save);
}
//if(bany(b))
//print("ovars = %Q\n", &ovar);
}
void
regopt(Prog *firstp)
{
Reg *r, *r1;
Prog *p;
int i, z, nr;
uint32 vreg;
Bits bit;
if(first) {
fmtinstall('Q', Qconv);
exregoffset = D_DI; // no externals
first = 0;
}
// count instructions
nr = 0;
for(p=firstp; p!=P; p=p->link)
nr++;
// if too big dont bother
if(nr >= 10000) {
// print("********** %S is too big (%d)\n", curfn->nname->sym, nr);
return;
}
r1 = R;
firstr = R;
lastr = R;
nvar = 0;
regbits = RtoB(D_SP);
for(z=0; z<BITS; z++) {
externs.b[z] = 0;
params.b[z] = 0;
consts.b[z] = 0;
addrs.b[z] = 0;
ovar.b[z] = 0;
}
// build list of return variables
setoutvar();
/*
* pass 1
* build aux data structure
* allocate pcs
* find use and set of variables
*/
nr = 0;
for(p=firstp; p!=P; p=p->link) {
switch(p->as) {
case ADATA:
case AGLOBL:
case ANAME:
case ASIGNAME:
continue;
}
r = rega();
nr++;
if(firstr == R) {
firstr = r;
lastr = r;
} else {
lastr->link = r;
r->p1 = lastr;
lastr->s1 = r;
lastr = r;
}
r->prog = p;
p->reg = r;
r1 = r->p1;
if(r1 != R) {
switch(r1->prog->as) {
case ARET:
case AJMP:
case AIRETL:
r->p1 = R;
r1->s1 = R;
}
}
bit = mkvar(r, &p->from);
if(bany(&bit))
switch(p->as) {
/*
* funny
*/
case ALEAL:
for(z=0; z<BITS; z++)
addrs.b[z] |= bit.b[z];
break;
/*
* left side read
*/
default:
for(z=0; z<BITS; z++)
r->use1.b[z] |= bit.b[z];
break;
/*
* left side read+write
*/
case AXCHGB:
case AXCHGW:
case AXCHGL:
for(z=0; z<BITS; z++) {
r->use1.b[z] |= bit.b[z];
r->set.b[z] |= bit.b[z];
}
break;
}
bit = mkvar(r, &p->to);
if(bany(&bit))
switch(p->as) {
default:
yyerror("reg: unknown op: %A", p->as);
break;
/*
* right side read
*/
case ACMPB:
case ACMPL:
case ACMPW:
for(z=0; z<BITS; z++)
r->use2.b[z] |= bit.b[z];
break;
/*
* right side write
*/
case ANOP:
case AMOVL:
case AMOVB:
case AMOVW:
case AMOVBLSX:
case AMOVBLZX:
case AMOVWLSX:
case AMOVWLZX:
for(z=0; z<BITS; z++)
r->set.b[z] |= bit.b[z];
break;
/*
* right side read+write
*/
case AINCB:
case AINCL:
case AINCW:
case ADECB:
case ADECL:
case ADECW:
case AADDB:
case AADDL:
case AADDW:
case AANDB:
case AANDL:
case AANDW:
case ASUBB:
case ASUBL:
case ASUBW:
case AORB:
case AORL:
case AORW:
case AXORB:
case AXORL:
case AXORW:
case ASALB:
case ASALL:
case ASALW:
case ASARB:
case ASARL:
case ASARW:
case ARCLB:
case ARCLL:
case ARCLW:
case ARCRB:
case ARCRL:
case ARCRW:
case AROLB:
case AROLL:
case AROLW:
case ARORB:
case ARORL:
case ARORW:
case ASHLB:
case ASHLL:
case ASHLW:
case ASHRB:
case ASHRL:
case ASHRW:
case AIMULL:
case AIMULW:
case ANEGB:
case ANEGL:
case ANEGW:
case ANOTB:
case ANOTL:
case ANOTW:
case AADCL:
case ASBBL:
case AXCHGB:
case AXCHGW:
case AXCHGL:
for(z=0; z<BITS; z++) {
r->set.b[z] |= bit.b[z];
r->use2.b[z] |= bit.b[z];
}
break;
/*
* funny
*/
case AFMOVDP:
case AFMOVFP:
case AFMOVLP:
case AFMOVVP:
case AFMOVWP:
case ACALL:
for(z=0; z<BITS; z++)
addrs.b[z] |= bit.b[z];
break;
}
switch(p->as) {
case AIMULL:
case AIMULW:
if(p->to.type != D_NONE)
break;
case AIDIVB:
case AIDIVL:
case AIDIVW:
case AIMULB:
case ADIVB:
case ADIVL:
case ADIVW:
case AMULB:
case AMULL:
case AMULW:
case ACWD:
case ACDQ:
r->regu |= RtoB(D_AX) | RtoB(D_DX);
break;
case AREP:
case AREPN:
case ALOOP:
case ALOOPEQ:
case ALOOPNE:
r->regu |= RtoB(D_CX);
break;
case AMOVSB:
case AMOVSL:
case AMOVSW:
case ACMPSB:
case ACMPSL:
case ACMPSW:
r->regu |= RtoB(D_SI) | RtoB(D_DI);
break;
case ASTOSB:
case ASTOSL:
case ASTOSW:
case ASCASB:
case ASCASL:
case ASCASW:
r->regu |= RtoB(D_AX) | RtoB(D_DI);
break;
case AINSB:
case AINSL:
case AINSW:
case AOUTSB:
case AOUTSL:
case AOUTSW:
r->regu |= RtoB(D_DI) | RtoB(D_DX);
break;
}
}
if(firstr == R)
return;
if(debug['R'] && debug['v'])
dumpit("pass1", firstr);
/*
* pass 2
* turn branch references to pointers
* build back pointers
*/
for(r=firstr; r!=R; r=r->link) {
p = r->prog;
if(p->to.type == D_BRANCH) {
if(p->to.branch == P)
fatal("pnil %P", p);
r1 = p->to.branch->reg;
if(r1 == R)
fatal("rnil %P", p);
if(r1 == r) {
//fatal("ref to self %P", p);
continue;
}
r->s2 = r1;
r->p2link = r1->p2;
r1->p2 = r;
}
}
if(debug['R'] && debug['v'])
dumpit("pass2", firstr);
/*
* pass 2.5
* find looping structure
*/
for(r = firstr; r != R; r = r->link)
r->active = 0;
change = 0;
loopit(firstr, nr);
if(debug['R'] && debug['v'])
dumpit("pass2.5", firstr);
/*
* pass 3
* iterate propagating usage
* back until flow graph is complete
*/
loop1:
change = 0;
for(r = firstr; r != R; r = r->link)
r->active = 0;
for(r = firstr; r != R; r = r->link)
if(r->prog->as == ARET)
prop(r, zbits, zbits);
loop11:
/* pick up unreachable code */
i = 0;
for(r = firstr; r != R; r = r1) {
r1 = r->link;
if(r1 && r1->active && !r->active) {
prop(r, zbits, zbits);
i = 1;
}
}
if(i)
goto loop11;
if(change)
goto loop1;
if(debug['R'] && debug['v'])
dumpit("pass3", firstr);
/*
* pass 4
* iterate propagating register/variable synchrony
* forward until graph is complete
*/
loop2:
change = 0;
for(r = firstr; r != R; r = r->link)
r->active = 0;
synch(firstr, zbits);
if(change)
goto loop2;
if(debug['R'] && debug['v'])
dumpit("pass4", firstr);
/*
* pass 5
* isolate regions
* calculate costs (paint1)
*/
r = firstr;
if(r) {
for(z=0; z<BITS; z++)
bit.b[z] = (r->refahead.b[z] | r->calahead.b[z]) &
~(externs.b[z] | params.b[z] | addrs.b[z] | consts.b[z]);
if(bany(&bit) && !r->refset) {
// should never happen - all variables are preset
if(debug['w'])
print("%L: used and not set: %Q\n", r->prog->lineno, bit);
r->refset = 1;
}
}
for(r = firstr; r != R; r = r->link)
r->act = zbits;
rgp = region;
nregion = 0;
for(r = firstr; r != R; r = r->link) {
for(z=0; z<BITS; z++)
bit.b[z] = r->set.b[z] &
~(r->refahead.b[z] | r->calahead.b[z] | addrs.b[z]);
if(bany(&bit) && !r->refset) {
if(debug['w'])
print("%L: set and not used: %Q\n", r->prog->lineno, bit);
r->refset = 1;
excise(r);
}
for(z=0; z<BITS; z++)
bit.b[z] = LOAD(r) & ~(r->act.b[z] | addrs.b[z]);
while(bany(&bit)) {
i = bnum(bit);
rgp->enter = r;
rgp->varno = i;
change = 0;
paint1(r, i);
bit.b[i/32] &= ~(1L<<(i%32));
if(change <= 0)
continue;
rgp->cost = change;
nregion++;
if(nregion >= NRGN) {
if(debug['R'] && debug['v'])
print("too many regions\n");
goto brk;
}
rgp++;
}
}
brk:
qsort(region, nregion, sizeof(region[0]), rcmp);
/*
* pass 6
* determine used registers (paint2)
* replace code (paint3)
*/
rgp = region;
for(i=0; i<nregion; i++) {
bit = blsh(rgp->varno);
vreg = paint2(rgp->enter, rgp->varno);
vreg = allreg(vreg, rgp);
if(rgp->regno != 0)
paint3(rgp->enter, rgp->varno, vreg, rgp->regno);
rgp++;
}
if(debug['R'] && debug['v'])
dumpit("pass6", firstr);
/*
* pass 7
* peep-hole on basic block
*/
if(!debug['R'] || debug['P']) {
peep();
}
/*
* eliminate nops
* free aux structures
*/
for(p=firstp; p!=P; p=p->link) {
while(p->link != P && p->link->as == ANOP)
p->link = p->link->link;
if(p->to.type == D_BRANCH)
while(p->to.branch != P && p->to.branch->as == ANOP)
p->to.branch = p->to.branch->link;
}
if(r1 != R) {
r1->link = freer;
freer = firstr;
}
if(debug['R']) {
if(ostats.ncvtreg ||
ostats.nspill ||
ostats.nreload ||
ostats.ndelmov ||
ostats.nvar ||
ostats.naddr ||
0)
print("\nstats\n");
if(ostats.ncvtreg)
print(" %4ld cvtreg\n", ostats.ncvtreg);
if(ostats.nspill)
print(" %4ld spill\n", ostats.nspill);
if(ostats.nreload)
print(" %4ld reload\n", ostats.nreload);
if(ostats.ndelmov)
print(" %4ld delmov\n", ostats.ndelmov);
if(ostats.nvar)
print(" %4ld delmov\n", ostats.nvar);
if(ostats.naddr)
print(" %4ld delmov\n", ostats.naddr);
memset(&ostats, 0, sizeof(ostats));
}
}
/*
* add mov b,rn
* just after r
*/
void
addmove(Reg *r, int bn, int rn, int f)
{
Prog *p, *p1;
Adr *a;
Var *v;
p1 = mal(sizeof(*p1));
clearp(p1);
p1->loc = 9999;
p = r->prog;
p1->link = p->link;
p->link = p1;
p1->lineno = p->lineno;
v = var + bn;
a = &p1->to;
a->sym = v->sym;
a->offset = v->offset;
a->etype = v->etype;
a->type = v->name;
a->gotype = v->gotype;
// need to clean this up with wptr and
// some of the defaults
p1->as = AMOVL;
switch(v->etype) {
default:
fatal("unknown type\n");
case TINT8:
case TUINT8:
case TBOOL:
p1->as = AMOVB;
break;
case TINT16:
case TUINT16:
p1->as = AMOVW;
break;
case TINT:
case TUINT:
case TINT32:
case TUINT32:
case TPTR32:
break;
}
p1->from.type = rn;
if(!f) {
p1->from = *a;
*a = zprog.from;
a->type = rn;
if(v->etype == TUINT8)
p1->as = AMOVB;
if(v->etype == TUINT16)
p1->as = AMOVW;
}
if(debug['R'] && debug['v'])
print("%P ===add=== %P\n", p, p1);
ostats.nspill++;
}
uint32
doregbits(int r)
{
uint32 b;
b = 0;
if(r >= D_INDIR)
r -= D_INDIR;
if(r >= D_AX && r <= D_DI)
b |= RtoB(r);
else
if(r >= D_AL && r <= D_BL)
b |= RtoB(r-D_AL+D_AX);
else
if(r >= D_AH && r <= D_BH)
b |= RtoB(r-D_AH+D_AX);
return b;
}
static int
overlap(Var *v, int o2, int w2)
{
int o1, w1, t1, t2, z;
Bits bit;
o1 = v->offset;
w1 = v->width;
t1 = o1+w1;
t2 = o2+w2;
if(!(t1 > o2 && t2 > o1))
return 0;
// set to max extent
if(o2 < o1)
v->offset = o2;
if(t1 > t2)
v->width = t1-v->offset;
else
v->width = t2-v->offset;
// and dont registerize
bit = blsh(v-var);
for(z=0; z<BITS; z++)
addrs.b[z] |= bit.b[z];
return 1;
}
Bits
mkvar(Reg *r, Adr *a)
{
Var *v;
int i, t, n, et, z, w, flag;
int32 o;
Bits bit;
Sym *s;
/*
* mark registers used
*/
t = a->type;
if(r != R) {
r->regu |= doregbits(t);
r->regu |= doregbits(a->index);
}
switch(t) {
default:
goto none;
case D_ADDR:
a->type = a->index;
bit = mkvar(r, a);
for(z=0; z<BITS; z++)
addrs.b[z] |= bit.b[z];
a->type = t;
ostats.naddr++;
goto none;
case D_EXTERN:
case D_STATIC:
case D_PARAM:
case D_AUTO:
n = t;
break;
}
s = a->sym;
if(s == S)
goto none;
if(s->name[0] == '.')
goto none;
et = a->etype;
o = a->offset;
w = a->width;
v = var;
flag = 0;
for(i=0; i<nvar; i++) {
if(s == v->sym)
if(n == v->name) {
// if it is the same, use it
if(v->etype == et)
if(v->width == w)
if(v->offset == o)
goto out;
// if it overlaps, set max
// width and dont registerize
if(overlap(v, o, w))
flag = 1;
}
v++;
}
if(flag)
goto none;
switch(et) {
case 0:
case TFUNC:
case TARRAY:
goto none;
}
if(nvar >= NVAR) {
if(debug['w'] > 1 && s)
fatal("variable not optimized: %D", a);
goto none;
}
i = nvar;
nvar++;
v = &var[i];
v->sym = s;
v->offset = o;
v->name = n;
v->gotype = a->gotype;
v->etype = et;
v->width = w;
if(debug['R'])
print("bit=%2d et=%2d w=%d %D\n", i, et, w, a);
ostats.nvar++;
out:
bit = blsh(i);
// funny punning
if(v->etype != et) {
if(debug['R'])
print("pun et=%d/%d w=%d/%d o=%d/%d %D\n",
v->etype, et,
v->width, w,
v->offset, o, a);
for(z=0; z<BITS; z++)
addrs.b[z] |= bit.b[z];
goto none;
}
if(n == D_EXTERN || n == D_STATIC)
for(z=0; z<BITS; z++)
externs.b[z] |= bit.b[z];
if(n == D_PARAM)
for(z=0; z<BITS; z++)
params.b[z] |= bit.b[z];
return bit;
none:
return zbits;
}
void
prop(Reg *r, Bits ref, Bits cal)
{
Reg *r1, *r2;
int z;
for(r1 = r; r1 != R; r1 = r1->p1) {
for(z=0; z<BITS; z++) {
ref.b[z] |= r1->refahead.b[z];
if(ref.b[z] != r1->refahead.b[z]) {
r1->refahead.b[z] = ref.b[z];
change++;
}
cal.b[z] |= r1->calahead.b[z];
if(cal.b[z] != r1->calahead.b[z]) {
r1->calahead.b[z] = cal.b[z];
change++;
}
}
switch(r1->prog->as) {
case ACALL:
if(noreturn(r1->prog))
break;
for(z=0; z<BITS; z++) {
cal.b[z] |= ref.b[z] | externs.b[z];
ref.b[z] = 0;
}
break;
case ATEXT:
for(z=0; z<BITS; z++) {
cal.b[z] = 0;
ref.b[z] = 0;
}
break;
case ARET:
for(z=0; z<BITS; z++) {
cal.b[z] = externs.b[z] | ovar.b[z];
ref.b[z] = 0;
}
break;
}
for(z=0; z<BITS; z++) {
ref.b[z] = (ref.b[z] & ~r1->set.b[z]) |
r1->use1.b[z] | r1->use2.b[z];
cal.b[z] &= ~(r1->set.b[z] | r1->use1.b[z] | r1->use2.b[z]);
r1->refbehind.b[z] = ref.b[z];
r1->calbehind.b[z] = cal.b[z];
}
if(r1->active)
break;
r1->active = 1;
}
for(; r != r1; r = r->p1)
for(r2 = r->p2; r2 != R; r2 = r2->p2link)
prop(r2, r->refbehind, r->calbehind);
}
/*
* find looping structure
*
* 1) find reverse postordering
* 2) find approximate dominators,
* the actual dominators if the flow graph is reducible
* otherwise, dominators plus some other non-dominators.
* See Matthew S. Hecht and Jeffrey D. Ullman,
* "Analysis of a Simple Algorithm for Global Data Flow Problems",
* Conf. Record of ACM Symp. on Principles of Prog. Langs, Boston, Massachusetts,
* Oct. 1-3, 1973, pp. 207-217.
* 3) find all nodes with a predecessor dominated by the current node.
* such a node is a loop head.
* recursively, all preds with a greater rpo number are in the loop
*/
int32
postorder(Reg *r, Reg **rpo2r, int32 n)
{
Reg *r1;
r->rpo = 1;
r1 = r->s1;
if(r1 && !r1->rpo)
n = postorder(r1, rpo2r, n);
r1 = r->s2;
if(r1 && !r1->rpo)
n = postorder(r1, rpo2r, n);
rpo2r[n] = r;
n++;
return n;
}
int32
rpolca(int32 *idom, int32 rpo1, int32 rpo2)
{
int32 t;
if(rpo1 == -1)
return rpo2;
while(rpo1 != rpo2){
if(rpo1 > rpo2){
t = rpo2;
rpo2 = rpo1;
rpo1 = t;
}
while(rpo1 < rpo2){
t = idom[rpo2];
if(t >= rpo2)
fatal("bad idom");
rpo2 = t;
}
}
return rpo1;
}
int
doms(int32 *idom, int32 r, int32 s)
{
while(s > r)
s = idom[s];
return s == r;
}
int
loophead(int32 *idom, Reg *r)
{
int32 src;
src = r->rpo;
if(r->p1 != R && doms(idom, src, r->p1->rpo))
return 1;
for(r = r->p2; r != R; r = r->p2link)
if(doms(idom, src, r->rpo))
return 1;
return 0;
}
void
loopmark(Reg **rpo2r, int32 head, Reg *r)
{
if(r->rpo < head || r->active == head)
return;
r->active = head;
r->loop += LOOP;
if(r->p1 != R)
loopmark(rpo2r, head, r->p1);
for(r = r->p2; r != R; r = r->p2link)
loopmark(rpo2r, head, r);
}
void
loopit(Reg *r, int32 nr)
{
Reg *r1;
int32 i, d, me;
if(nr > maxnr) {
rpo2r = mal(nr * sizeof(Reg*));
idom = mal(nr * sizeof(int32));
maxnr = nr;
}
d = postorder(r, rpo2r, 0);
if(d > nr)
fatal("too many reg nodes %d %d", d, nr);
nr = d;
for(i = 0; i < nr / 2; i++) {
r1 = rpo2r[i];
rpo2r[i] = rpo2r[nr - 1 - i];
rpo2r[nr - 1 - i] = r1;
}
for(i = 0; i < nr; i++)
rpo2r[i]->rpo = i;
idom[0] = 0;
for(i = 0; i < nr; i++) {
r1 = rpo2r[i];
me = r1->rpo;
d = -1;
if(r1->p1 != R && r1->p1->rpo < me)
d = r1->p1->rpo;
for(r1 = r1->p2; r1 != nil; r1 = r1->p2link)
if(r1->rpo < me)
d = rpolca(idom, d, r1->rpo);
idom[i] = d;
}
for(i = 0; i < nr; i++) {
r1 = rpo2r[i];
r1->loop++;
if(r1->p2 != R && loophead(idom, r1))
loopmark(rpo2r, i, r1);
}
}
void
synch(Reg *r, Bits dif)
{
Reg *r1;
int z;
for(r1 = r; r1 != R; r1 = r1->s1) {
for(z=0; z<BITS; z++) {
dif.b[z] = (dif.b[z] &
~(~r1->refbehind.b[z] & r1->refahead.b[z])) |
r1->set.b[z] | r1->regdiff.b[z];
if(dif.b[z] != r1->regdiff.b[z]) {
r1->regdiff.b[z] = dif.b[z];
change++;
}
}
if(r1->active)
break;
r1->active = 1;
for(z=0; z<BITS; z++)
dif.b[z] &= ~(~r1->calbehind.b[z] & r1->calahead.b[z]);
if(r1->s2 != R)
synch(r1->s2, dif);
}
}
uint32
allreg(uint32 b, Rgn *r)
{
Var *v;
int i;
v = var + r->varno;
r->regno = 0;
switch(v->etype) {
default:
fatal("unknown etype %d/%E", bitno(b), v->etype);
break;
case TINT8:
case TUINT8:
case TINT16:
case TUINT16:
case TINT32:
case TUINT32:
case TINT64:
case TINT:
case TUINT:
case TUINTPTR:
case TBOOL:
case TPTR32:
i = BtoR(~b);
if(i && r->cost > 0) {
r->regno = i;
return RtoB(i);
}
break;
case TFLOAT32:
case TFLOAT64:
case TFLOAT:
break;
}
return 0;
}
void
paint1(Reg *r, int bn)
{
Reg *r1;
Prog *p;
int z;
uint32 bb;
z = bn/32;
bb = 1L<<(bn%32);
if(r->act.b[z] & bb)
return;
for(;;) {
if(!(r->refbehind.b[z] & bb))
break;
r1 = r->p1;
if(r1 == R)
break;
if(!(r1->refahead.b[z] & bb))
break;
if(r1->act.b[z] & bb)
break;
r = r1;
}
if(LOAD(r) & ~(r->set.b[z]&~(r->use1.b[z]|r->use2.b[z])) & bb) {
change -= CLOAD * r->loop;
}
for(;;) {
r->act.b[z] |= bb;
p = r->prog;
if(r->use1.b[z] & bb) {
change += CREF * r->loop;
if(p->as == AFMOVL || p->as == AFMOVW)
if(BtoR(bb) != D_F0)
change = -CINF;
}
if((r->use2.b[z]|r->set.b[z]) & bb) {
change += CREF * r->loop;
if(p->as == AFMOVL || p->as == AFMOVW)
if(BtoR(bb) != D_F0)
change = -CINF;
}
if(STORE(r) & r->regdiff.b[z] & bb) {
change -= CLOAD * r->loop;
if(p->as == AFMOVL || p->as == AFMOVW)
if(BtoR(bb) != D_F0)
change = -CINF;
}
if(r->refbehind.b[z] & bb)
for(r1 = r->p2; r1 != R; r1 = r1->p2link)
if(r1->refahead.b[z] & bb)
paint1(r1, bn);
if(!(r->refahead.b[z] & bb))
break;
r1 = r->s2;
if(r1 != R)
if(r1->refbehind.b[z] & bb)
paint1(r1, bn);
r = r->s1;
if(r == R)
break;
if(r->act.b[z] & bb)
break;
if(!(r->refbehind.b[z] & bb))
break;
}
}
uint32
regset(Reg *r, uint32 bb)
{
uint32 b, set;
Adr v;
int c;
set = 0;
v = zprog.from;
while(b = bb & ~(bb-1)) {
v.type = BtoR(b);
c = copyu(r->prog, &v, A);
if(c == 3)
set |= b;
bb &= ~b;
}
return set;
}
uint32
reguse(Reg *r, uint32 bb)
{
uint32 b, set;
Adr v;
int c;
set = 0;
v = zprog.from;
while(b = bb & ~(bb-1)) {
v.type = BtoR(b);
c = copyu(r->prog, &v, A);
if(c == 1 || c == 2 || c == 4)
set |= b;
bb &= ~b;
}
return set;
}
uint32
paint2(Reg *r, int bn)
{
Reg *r1;
int z;
uint32 bb, vreg, x;
z = bn/32;
bb = 1L << (bn%32);
vreg = regbits;
if(!(r->act.b[z] & bb))
return vreg;
for(;;) {
if(!(r->refbehind.b[z] & bb))
break;
r1 = r->p1;
if(r1 == R)
break;
if(!(r1->refahead.b[z] & bb))
break;
if(!(r1->act.b[z] & bb))
break;
r = r1;
}
for(;;) {
r->act.b[z] &= ~bb;
vreg |= r->regu;
if(r->refbehind.b[z] & bb)
for(r1 = r->p2; r1 != R; r1 = r1->p2link)
if(r1->refahead.b[z] & bb)
vreg |= paint2(r1, bn);
if(!(r->refahead.b[z] & bb))
break;
r1 = r->s2;
if(r1 != R)
if(r1->refbehind.b[z] & bb)
vreg |= paint2(r1, bn);
r = r->s1;
if(r == R)
break;
if(!(r->act.b[z] & bb))
break;
if(!(r->refbehind.b[z] & bb))
break;
}
bb = vreg;
for(; r; r=r->s1) {
x = r->regu & ~bb;
if(x) {
vreg |= reguse(r, x);
bb |= regset(r, x);
}
}
return vreg;
}
void
paint3(Reg *r, int bn, int32 rb, int rn)
{
Reg *r1;
Prog *p;
int z;
uint32 bb;
z = bn/32;
bb = 1L << (bn%32);
if(r->act.b[z] & bb)
return;
for(;;) {
if(!(r->refbehind.b[z] & bb))
break;
r1 = r->p1;
if(r1 == R)
break;
if(!(r1->refahead.b[z] & bb))
break;
if(r1->act.b[z] & bb)
break;
r = r1;
}
if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb)
addmove(r, bn, rn, 0);
for(;;) {
r->act.b[z] |= bb;
p = r->prog;
if(r->use1.b[z] & bb) {
if(debug['R'] && debug['v'])
print("%P", p);
addreg(&p->from, rn);
if(debug['R'] && debug['v'])
print(" ===change== %P\n", p);
}
if((r->use2.b[z]|r->set.b[z]) & bb) {
if(debug['R'] && debug['v'])
print("%P", p);
addreg(&p->to, rn);
if(debug['R'] && debug['v'])
print(" ===change== %P\n", p);
}
if(STORE(r) & r->regdiff.b[z] & bb)
addmove(r, bn, rn, 1);
r->regu |= rb;
if(r->refbehind.b[z] & bb)
for(r1 = r->p2; r1 != R; r1 = r1->p2link)
if(r1->refahead.b[z] & bb)
paint3(r1, bn, rb, rn);
if(!(r->refahead.b[z] & bb))
break;
r1 = r->s2;
if(r1 != R)
if(r1->refbehind.b[z] & bb)
paint3(r1, bn, rb, rn);
r = r->s1;
if(r == R)
break;
if(r->act.b[z] & bb)
break;
if(!(r->refbehind.b[z] & bb))
break;
}
}
void
addreg(Adr *a, int rn)
{
a->sym = 0;
a->offset = 0;
a->type = rn;
ostats.ncvtreg++;
}
int32
RtoB(int r)
{
if(r < D_AX || r > D_DI)
return 0;
return 1L << (r-D_AX);
}
int
BtoR(int32 b)
{
b &= 0xffL;
if(b == 0)
return 0;
return bitno(b) + D_AX;
}
void
dumpone(Reg *r)
{
int z;
Bits bit;
print("%ld:%P", r->loop, r->prog);
for(z=0; z<BITS; z++)
bit.b[z] =
r->set.b[z] |
r->use1.b[z] |
r->use2.b[z] |
r->refbehind.b[z] |
r->refahead.b[z] |
r->calbehind.b[z] |
r->calahead.b[z] |
r->regdiff.b[z] |
r->act.b[z] |
0;
if(bany(&bit)) {
print("\t");
if(bany(&r->set))
print(" s:%Q", r->set);
if(bany(&r->use1))
print(" u1:%Q", r->use1);
if(bany(&r->use2))
print(" u2:%Q", r->use2);
if(bany(&r->refbehind))
print(" rb:%Q ", r->refbehind);
if(bany(&r->refahead))
print(" ra:%Q ", r->refahead);
if(bany(&r->calbehind))
print("cb:%Q ", r->calbehind);
if(bany(&r->calahead))
print(" ca:%Q ", r->calahead);
if(bany(&r->regdiff))
print(" d:%Q ", r->regdiff);
if(bany(&r->act))
print(" a:%Q ", r->act);
}
print("\n");
}
void
dumpit(char *str, Reg *r0)
{
Reg *r, *r1;
print("\n%s\n", str);
for(r = r0; r != R; r = r->link) {
dumpone(r);
r1 = r->p2;
if(r1 != R) {
print(" pred:");
for(; r1 != R; r1 = r1->p2link)
print(" %.4lud", r1->prog->loc);
print("\n");
}
// r1 = r->s1;
// if(r1 != R) {
// print(" succ:");
// for(; r1 != R; r1 = r1->s1)
// print(" %.4lud", r1->prog->loc);
// print("\n");
// }
}
}
static Sym* symlist[10];
int
noreturn(Prog *p)
{
Sym *s;
int i;
if(symlist[0] == S) {
symlist[0] = pkglookup("throwindex", "runtime");
symlist[1] = pkglookup("throwslice", "runtime");
symlist[2] = pkglookup("throwinit", "runtime");
symlist[3] = pkglookup("panicl", "runtime");
}
s = p->to.sym;
if(s == S)
return 0;
for(i=0; symlist[i]!=S; i++)
if(s == symlist[i])
return 1;
return 0;
}
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