1
0
mirror of https://github.com/golang/go synced 2024-11-24 22:57:57 -07:00

initial cut at arm optimizer

R=rsc
CC=golang-dev
https://golang.org/cl/3921041
This commit is contained in:
Ken Thompson 2011-01-07 18:04:48 -08:00
parent 80055c658b
commit 90ca4d75a4
3 changed files with 159 additions and 65 deletions

View File

@ -24,6 +24,7 @@ OFILES=\
cgen64.$O\
cplx.$O\
reg.$O\
peep.$O\
LIB=\
../gc/gc.a\

View File

@ -154,10 +154,16 @@ Dconv(Fmt *fp)
break;
case D_BRANCH:
if(a->sym != S)
sprint(str, "%s+%d(APC)", a->sym->name, a->offset);
else
sprint(str, "%d(APC)", a->offset);
if(a->branch == P || a->branch->loc == 0) {
if(a->sym != S)
sprint(str, "%s+%d(APC)", a->sym->name, a->offset);
else
sprint(str, "%d(APC)", a->offset);
} else
if(a->sym != S)
sprint(str, "%s+%d(APC)", a->sym->name, a->branch->loc);
else
sprint(str, "%d(APC)", a->branch->loc);
break;
case D_FCONST:

View File

@ -34,9 +34,9 @@
#define P2R(p) (Reg*)(p->reg)
void addsplits(void);
int onlyone;
static int first = 1;
void addsplits(void);
int noreturn(Prog *p);
static int first = 0;
Reg*
rega(void)
@ -137,13 +137,24 @@ regopt(Prog *firstp)
uint32 vreg;
Bits bit;
return;
if(first) {
if(first == 0) {
fmtinstall('Q', Qconv);
// exregoffset = D_R13; // R14,R15 are external
first = 0;
}
first++;
//if(!debug['K'])
// return;
//if(first != 19) {
// return;
//}
//print("optimizing %S\n", curfn->nname->sym);
//debug['R'] = 2;
//debug['P'] = 2;
// count instructions
nr = 0;
@ -152,7 +163,7 @@ return;
// if too big dont bother
if(nr >= 10000) {
print("********** %S is too big (%d)\n", curfn->nname->sym, nr);
// print("********** %S is too big (%d)\n", curfn->nname->sym, nr);
return;
}
@ -178,7 +189,7 @@ return;
* allocate pcs
* find use and set of variables
*/
print("pass 1\n");
if(0) print("pass 1\n");
nr = 0;
for(p=firstp; p != P; p = p->link) {
switch(p->as) {
@ -265,20 +276,15 @@ print("pass 1\n");
}
}
}
if(firstr == R) {
if(firstr == R)
return;
}
onlyone++;
if(onlyone != 1)
return;
/*
* pass 2
* turn branch references to pointers
* build back pointers
*/
print("pass 2\n");
if(0) print("pass 2\n");
for(r=firstr; r!=R; r=r->link) {
p = r->prog;
if(p->to.type == D_BRANCH) {
@ -305,7 +311,7 @@ print("pass 2\n");
* pass 2.5
* find looping structure
*/
print("pass 2.5\n");
if(0) print("pass 2.5\n");
for(r = firstr; r != R; r = r->link)
r->active = 0;
change = 0;
@ -317,7 +323,7 @@ print("pass 2.5\n");
* back until flow graph is complete
*/
loop1:
print("loop 1\n");
if(0) print("loop 1\n");
change = 0;
for(r = firstr; r != R; r = r->link)
r->active = 0;
@ -325,7 +331,7 @@ print("loop 1\n");
if(r->prog->as == ARET)
prop(r, zbits, zbits);
loop11:
print("loop 11\n");
if(0) print("loop 11\n");
/* pick up unreachable code */
i = 0;
for(r = firstr; r != R; r = r1) {
@ -347,7 +353,7 @@ print("loop 11\n");
* forward until graph is complete
*/
loop2:
print("loop 2\n");
if(0) print("loop 2\n");
change = 0;
for(r = firstr; r != R; r = r->link)
r->active = 0;
@ -357,7 +363,7 @@ print("loop 2\n");
addsplits();
if(debug['R'] && debug['v']) {
if(debug['R'] > 1) {
print("\nprop structure:\n");
for(r = firstr; r != R; r = r->link) {
print("%d:%P", r->loop, r->prog);
@ -394,7 +400,7 @@ print("loop 2\n");
* isolate regions
* calculate costs (paint1)
*/
print("pass 5\n");
if(0) print("pass 5\n");
r = firstr;
if(r) {
for(z=0; z<BITS; z++)
@ -429,7 +435,7 @@ print("pass 5\n");
rgp->enter = r;
rgp->varno = i;
change = 0;
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("\n");
paint1(r, i);
bit.b[i/32] &= ~(1L<<(i%32));
@ -442,7 +448,7 @@ print("pass 5\n");
rgp->cost = change;
nregion++;
if(nregion >= NRGN) {
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("too many regions\n");
goto brk;
}
@ -457,7 +463,6 @@ brk:
* determine used registers (paint2)
* replace code (paint3)
*/
print("pass 6 -- %d regions\n", nregion);
rgp = region;
for(i=0; i<nregion; i++) {
bit = blsh(rgp->varno);
@ -485,9 +490,9 @@ print("pass 6 -- %d regions\n", nregion);
* pass 7
* peep-hole on basic block
*/
print("pass 7\n");
if(0) print("pass 7\n");
if(!debug['R'] || debug['P']) {
// peep();
peep();
}
/*
@ -495,9 +500,12 @@ print("pass 7\n");
* eliminate nops
* free aux structures
*/
for(p = firstr->prog; p != P; p = p->link){
while(p->link && p->link->as == ANOP)
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;
@ -562,15 +570,31 @@ addmove(Reg *r, int bn, int rn, int f)
if(a->etype == TARRAY || a->sym == S)
a->type = D_CONST;
p1->as = AMOVW;
if(v->etype == TINT8 || v->etype == TUINT8)
switch(v->etype) {
default:
print("What is this %E\n", v->etype);
case TINT32:
case TUINT32:
case TPTR32:
case TBOOL:
p1->as = AMOVW;
break;
case TINT8:
case TUINT8:
p1->as = AMOVB;
if(v->etype == TINT16 || v->etype == TUINT16)
break;
case TINT16:
case TUINT16:
p1->as = AMOVH;
if(v->etype == TFLOAT)
break;
case TFLOAT32:
p1->as = AMOVF;
if(v->etype == TFLOAT64)
break;
case TFLOAT64:
p1->as = AMOVD;
break;
}
p1->from.type = D_REG;
p1->from.reg = rn;
@ -619,32 +643,72 @@ mkvar(Reg *r, Adr *a, int docon)
Bits bit;
Sym *s;
// mark registers used
t = a->type;
if(t == D_REG && a->reg != NREG)
r->regu |= RtoB(a->reg);
if(t == D_FREG && a->reg != NREG)
r->regu |= FtoB(a->reg);
s = a->sym;
o = a->offset;
et = a->etype;
if(s == S) {
if(t != D_CONST || !docon || a->reg != NREG)
goto none;
et = TINT32;
n = D_NONE;
switch(t) {
default:
print("type %d %d %D\n", t, a->name, a);
goto none;
case D_NONE:
case D_CONST:
case D_FCONST:
case D_BRANCH:
goto none;
case D_REGREG:
if(a->offset != NREG)
r->regu |= RtoB(a->offset);
// fallthrough
case D_REG:
case D_SHIFT:
case D_OREG:
if(a->reg != NREG)
r->regu |= RtoB(a->reg);
break;
case D_FREG:
if(a->reg != NREG)
r->regu |= FtoB(a->reg);
break;
}
if(t == D_CONST) {
// if(s == S && sval(o))
// goto none;
switch(a->name) {
default:
goto none;
case D_EXTERN:
case D_STATIC:
case D_AUTO:
case D_PARAM:
n = a->name;
break;
}
flag = 0;
// if(a->pun)
// flag = 1;
s = a->sym;
if(s == S)
goto none;
if(s->name[0] == '.')
goto none;
et = a->etype;
o = a->offset;
w = a->width;
for(i=0; i<nvar; i++) {
v = var+i;
if(v->sym == s && v->name == n) {
if(v->offset == o)
if(v->etype == et)
if(v->width == w)
return blsh(i);
if(!flag)
return blsh(i);
// if they overlaps, disable both
if(overlap(v->offset, v->width, o, w)) {
@ -654,12 +718,11 @@ mkvar(Reg *r, Adr *a, int docon)
}
}
// if(a->pun)
// flag = 1;
switch(et) {
case 0:
case TFUNC:
case TARRAY:
case TSTRING:
goto none;
}
@ -681,7 +744,7 @@ mkvar(Reg *r, Adr *a, int docon)
v->addr = flag; // funny punning
if(debug['R'])
print("bit=%2d et=%2d %D\n", i, et, a);
print("bit=%2d et=%E pun=%d %D\n", i, et, flag, a);
out:
bit = blsh(i);
@ -692,9 +755,6 @@ out:
for(z=0; z<BITS; z++)
params.b[z] |= bit.b[z];
// if(v->etype != et || !typechlpfd[et]) /* funny punning */
// for(z=0; z<BITS; z++)
// addrs.b[z] |= bit.b[z];
// if(t == D_CONST) {
// if(s == S) {
// for(z=0; z<BITS; z++)
@ -738,6 +798,8 @@ prop(Reg *r, Bits ref, Bits cal)
}
switch(r1->prog->as) {
case ABL:
if(noreturn(r1->prog))
break;
for(z=0; z<BITS; z++) {
cal.b[z] |= ref.b[z] | externs.b[z];
ref.b[z] = 0;
@ -753,9 +815,10 @@ prop(Reg *r, Bits ref, Bits cal)
case ARET:
for(z=0; z<BITS; z++) {
cal.b[z] = externs.b[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]) |
@ -1008,7 +1071,7 @@ paint1(Reg *r, int bn)
if(LOAD(r) & ~(r->set.b[z] & ~(r->use1.b[z]|r->use2.b[z])) & bb) {
change -= CLOAD * r->loop;
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("%d%P\td %Q $%d\n", r->loop,
r->prog, blsh(bn), change);
}
@ -1018,21 +1081,21 @@ paint1(Reg *r, int bn)
if(r->use1.b[z] & bb) {
change += CREF * r->loop;
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("%d%P\tu1 %Q $%d\n", r->loop,
p, blsh(bn), change);
}
if((r->use2.b[z]|r->set.b[z]) & bb) {
change += CREF * r->loop;
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("%d%P\tu2 %Q $%d\n", r->loop,
p, blsh(bn), change);
}
if(STORE(r) & r->regdiff.b[z] & bb) {
change -= CLOAD * r->loop;
if(debug['R'] && debug['v'])
if(debug['R'] > 1)
print("%d%P\tst %Q $%d\n", r->loop,
p, blsh(bn), change);
}
@ -1244,3 +1307,27 @@ BtoF(int32 b)
return 0;
return bitno(b) - 16;
}
static Sym* symlist[10];
int
noreturn(Prog *p)
{
Sym *s;
int i;
if(symlist[0] == S) {
symlist[0] = pkglookup("panicindex", runtimepkg);
symlist[1] = pkglookup("panicslice", runtimepkg);
symlist[2] = pkglookup("throwinit", runtimepkg);
symlist[3] = pkglookup("panic", runtimepkg);
}
s = p->to.sym;
if(s == S)
return 0;
for(i=0; symlist[i]!=S; i++)
if(s == symlist[i])
return 1;
return 0;
}