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go/src/liblink/sched9.c

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// cmd/9l/sched.c from Vita Nuova.
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2008 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2008 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.
// +build ignore
#include "l.h"
enum
{
E_ICC = 1<<0,
E_FCC = 1<<1,
E_MEM = 1<<2,
E_MEMSP = 1<<3, /* uses offset and size */
E_MEMSB = 1<<4, /* uses offset and size */
E_LR = 1<<5,
E_CR = 1<<6,
E_CTR = 1<<7,
E_XER = 1<<8,
E_CR0 = 0xF<<0,
E_CR1 = 0xF<<4,
ANYMEM = E_MEM|E_MEMSP|E_MEMSB,
ALL = ~0,
};
typedef struct Sch Sch;
typedef struct Dep Dep;
struct Dep
{
ulong ireg;
ulong freg;
ulong cc;
ulong cr;
};
struct Sch
{
Prog p;
Dep set;
Dep used;
long soffset;
char size;
char comp;
};
void regused(Sch*, Prog*);
int depend(Sch*, Sch*);
int conflict(Sch*, Sch*);
int offoverlap(Sch*, Sch*);
void dumpbits(Sch*, Dep*);
void
sched(Prog *p0, Prog *pe)
{
Prog *p, *q;
Sch sch[NSCHED], *s, *t, *u, *se, stmp;
if(!debug['Q'])
return;
/*
* build side structure
*/
s = sch;
for(p=p0;; p=p->link) {
memset(s, 0, sizeof(*s));
s->p = *p;
regused(s, p);
if(debug['X']) {
Bprint(&bso, "%P\tset", &s->p);
dumpbits(s, &s->set);
Bprint(&bso, "; used");
dumpbits(s, &s->used);
if(s->comp)
Bprint(&bso, "; compound");
if(s->p.mark & LOAD)
Bprint(&bso, "; load");
if(s->p.mark & BRANCH)
Bprint(&bso, "; branch");
if(s->p.mark & FCMP)
Bprint(&bso, "; fcmp");
Bprint(&bso, "\n");
}
s++;
if(p == pe)
break;
}
se = s;
for(s=se-1; s>=sch; s--) {
/*
* load delay. interlocked.
*/
if(s->p.mark & LOAD) {
if(s >= se-1)
continue;
if(!conflict(s, (s+1)))
continue;
/*
* s is load, s+1 is immediate use of result
* t is the trial instruction to insert between s and s+1
*/
for(t=s-1; t>=sch; t--) {
if(t->p.mark & BRANCH)
goto no2;
if(t->p.mark & FCMP)
if((s+1)->p.mark & BRANCH)
goto no2;
if(t->p.mark & LOAD)
if(conflict(t, (s+1)))
goto no2;
for(u=t+1; u<=s; u++)
if(depend(u, t))
goto no2;
goto out2;
no2:;
}
if(debug['X'])
Bprint(&bso, "?l%P\n", &s->p);
continue;
out2:
if(debug['X']) {
Bprint(&bso, "!l%P\n", &t->p);
Bprint(&bso, "%P\n", &s->p);
}
stmp = *t;
memmove(t, t+1, (uchar*)s - (uchar*)t);
*s = stmp;
s--;
continue;
}
/*
* fop2 delay.
*/
if(s->p.mark & FCMP) {
if(s >= se-1)
continue;
if(!((s+1)->p.mark & BRANCH))
continue;
/* t is the trial instruction to use */
for(t=s-1; t>=sch; t--) {
for(u=t+1; u<=s; u++)
if(depend(u, t))
goto no3;
goto out3;
no3:;
}
if(debug['X'])
Bprint(&bso, "?f%P\n", &s->p);
continue;
out3:
if(debug['X']) {
Bprint(&bso, "!f%P\n", &t->p);
Bprint(&bso, "%P\n", &s->p);
}
stmp = *t;
memmove(t, t+1, (uchar*)s - (uchar*)t);
*s = stmp;
s--;
continue;
}
}
/*
* put it all back
*/
for(s=sch, p=p0; s<se; s++, p=q) {
q = p->link;
if(q != s->p.link) {
*p = s->p;
p->link = q;
}
}
if(debug['X'])
Bprint(&bso, "\n");
}
void
regused(Sch *s, Prog *realp)
{
int c, ar, ad, ld, sz, nr, upd;
ulong m;
Prog *p;
p = &s->p;
s->comp = compound(p);
if(s->comp) {
s->set.ireg |= 1<<REGTMP;
s->used.ireg |= 1<<REGTMP;
}
ar = 0; /* dest is really reference */
ad = 0; /* source/dest is really address */
ld = 0; /* opcode is load instruction */
sz = 32*4; /* size of load/store for overlap computation */
nr = 0; /* source/dest is not really reg */
upd = 0; /* move with update; changes reg */
/*
* flags based on opcode
*/
switch(p->as) {
case ATEXT:
curtext = realp;
autosize = p->to.offset + 8;
ad = 1;
break;
case ABL:
s->set.cc |= E_LR;
ar = 1;
ad = 1;
break;
case ABR:
ar = 1;
ad = 1;
break;
case ACMP:
case ACMPU:
case ACMPW:
case ACMPWU:
s->set.cc |= E_ICC;
if(p->reg == 0)
s->set.cr |= E_CR0;
else
s->set.cr |= (0xF<<((p->reg&7)*4));
ar = 1;
break;
case AFCMPO:
case AFCMPU:
s->set.cc |= E_FCC;
if(p->reg == 0)
s->set.cr |= E_CR0;
else
s->set.cr |= (0xF<<((p->reg&7)*4));
ar = 1;
break;
case ACRAND:
case ACRANDN:
case ACREQV:
case ACRNAND:
case ACRNOR:
case ACROR:
case ACRORN:
case ACRXOR:
s->used.cr |= 1<<p->from.reg;
s->set.cr |= 1<<p->to.reg;
nr = 1;
break;
case ABCL: /* tricky */
s->used.cc |= E_FCC|E_ICC;
s->used.cr = ALL;
s->set.cc |= E_LR;
ar = 1;
break;
case ABC: /* tricky */
s->used.cc |= E_FCC|E_ICC;
s->used.cr = ALL;
ar = 1;
break;
case ABEQ:
case ABGE:
case ABGT:
case ABLE:
case ABLT:
case ABNE:
case ABVC:
case ABVS:
s->used.cc |= E_ICC;
s->used.cr |= E_CR0;
ar = 1;
break;
case ALSW:
case AMOVMW:
/* could do better */
sz = 32*4;
ld = 1;
break;
case AMOVBU:
case AMOVBZU:
upd = 1;
sz = 1;
ld = 1;
break;
case AMOVB:
case AMOVBZ:
sz = 1;
ld = 1;
break;
case AMOVHU:
case AMOVHZU:
upd = 1;
sz = 2;
ld = 1;
break;
case AMOVH:
case AMOVHBR:
case AMOVHZ:
sz = 2;
ld = 1;
break;
case AFMOVSU:
case AMOVWU:
case AMOVWZU:
upd = 1;
sz = 4;
ld = 1;
break;
case AFMOVS:
case AMOVW:
case AMOVWZ:
case AMOVWBR:
case ALWAR:
sz = 4;
ld = 1;
break;
case AFMOVDU:
upd = 1;
sz = 8;
ld = 1;
break;
case AFMOVD:
sz = 8;
ld = 1;
break;
case AFMOVDCC:
sz = 8;
ld = 1;
s->set.cc |= E_FCC;
s->set.cr |= E_CR1;
break;
case AMOVFL:
case AMOVCRFS:
case AMTFSB0:
case AMTFSB0CC:
case AMTFSB1:
case AMTFSB1CC:
s->set.ireg = ALL;
s->set.freg = ALL;
s->set.cc = ALL;
s->set.cr = ALL;
break;
case AADDCC:
case AADDVCC:
case AADDCCC:
case AADDCVCC:
case AADDMECC:
case AADDMEVCC:
case AADDECC:
case AADDEVCC:
case AADDZECC:
case AADDZEVCC:
case AANDCC:
case AANDNCC:
case ACNTLZWCC:
case ADIVWCC:
case ADIVWVCC:
case ADIVWUCC:
case ADIVWUVCC:
case AEQVCC:
case AEXTSBCC:
case AEXTSHCC:
case AMULHWCC:
case AMULHWUCC:
case AMULLWCC:
case AMULLWVCC:
case ANANDCC:
case ANEGCC:
case ANEGVCC:
case ANORCC:
case AORCC:
case AORNCC:
case AREMCC:
case AREMVCC:
case AREMUCC:
case AREMUVCC:
case ARLWMICC:
case ARLWNMCC:
case ASLWCC:
case ASRAWCC:
case ASRWCC:
case ASTWCCC:
case ASUBCC:
case ASUBVCC:
case ASUBCCC:
case ASUBCVCC:
case ASUBMECC:
case ASUBMEVCC:
case ASUBECC:
case ASUBEVCC:
case ASUBZECC:
case ASUBZEVCC:
case AXORCC:
s->set.cc |= E_ICC;
s->set.cr |= E_CR0;
break;
case AFABSCC:
case AFADDCC:
case AFADDSCC:
case AFCTIWCC:
case AFCTIWZCC:
case AFDIVCC:
case AFDIVSCC:
case AFMADDCC:
case AFMADDSCC:
case AFMSUBCC:
case AFMSUBSCC:
case AFMULCC:
case AFMULSCC:
case AFNABSCC:
case AFNEGCC:
case AFNMADDCC:
case AFNMADDSCC:
case AFNMSUBCC:
case AFNMSUBSCC:
case AFRSPCC:
case AFSUBCC:
case AFSUBSCC:
s->set.cc |= E_FCC;
s->set.cr |= E_CR1;
break;
}
/*
* flags based on 'to' field
*/
c = p->to.class;
if(c == 0) {
c = aclass(&p->to) + 1;
p->to.class = c;
}
c--;
switch(c) {
default:
print("unknown class %d %D\n", c, &p->to);
case C_NONE:
case C_ZCON:
case C_SCON:
case C_UCON:
case C_LCON:
case C_ADDCON:
case C_ANDCON:
case C_SBRA:
case C_LBRA:
break;
case C_CREG:
c = p->to.reg;
if(c == NREG)
s->set.cr = ALL;
else
s->set.cr |= (0xF << ((p->from.reg&7)*4));
s->set.cc = ALL;
break;
case C_SPR:
case C_FPSCR:
case C_MSR:
case C_XER:
s->set.ireg = ALL;
s->set.freg = ALL;
s->set.cc = ALL;
s->set.cr = ALL;
break;
case C_LR:
s->set.cc |= E_LR;
break;
case C_CTR:
s->set.cc |= E_CTR;
break;
case C_ZOREG:
case C_SOREG:
case C_LOREG:
c = p->to.reg;
s->used.ireg |= 1<<c;
if(upd)
s->set.ireg |= 1<<c;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->to);
m = ANYMEM;
if(c == REGSB)
m = E_MEMSB;
if(c == REGSP)
m = E_MEMSP;
if(ar)
s->used.cc |= m;
else
s->set.cc |= m;
break;
case C_SACON:
case C_LACON:
s->used.ireg |= 1<<REGSP;
if(upd)
s->set.ireg |= 1<<c;
break;
case C_SECON:
case C_LECON:
s->used.ireg |= 1<<REGSB;
if(upd)
s->set.ireg |= 1<<c;
break;
case C_REG:
if(nr)
break;
if(ar)
s->used.ireg |= 1<<p->to.reg;
else
s->set.ireg |= 1<<p->to.reg;
break;
case C_FREG:
if(ar)
s->used.freg |= 1<<p->to.reg;
else
s->set.freg |= 1<<p->to.reg;
break;
case C_SAUTO:
case C_LAUTO:
s->used.ireg |= 1<<REGSP;
if(upd)
s->set.ireg |= 1<<c;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->to);
if(ar)
s->used.cc |= E_MEMSP;
else
s->set.cc |= E_MEMSP;
break;
case C_SEXT:
case C_LEXT:
s->used.ireg |= 1<<REGSB;
if(upd)
s->set.ireg |= 1<<c;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->to);
if(ar)
s->used.cc |= E_MEMSB;
else
s->set.cc |= E_MEMSB;
break;
}
/*
* flags based on 'from' field
*/
c = p->from.class;
if(c == 0) {
c = aclass(&p->from) + 1;
p->from.class = c;
}
c--;
switch(c) {
default:
print("unknown class %d %D\n", c, &p->from);
case C_NONE:
case C_ZCON:
case C_SCON:
case C_UCON:
case C_LCON:
case C_ADDCON:
case C_ANDCON:
case C_SBRA:
case C_LBRA:
c = p->from.reg;
if(c != NREG)
s->used.ireg |= 1<<c;
break;
case C_CREG:
c = p->from.reg;
if(c == NREG)
s->used.cr = ALL;
else
s->used.cr |= (0xF << ((p->from.reg&7)*4));
s->used.cc = ALL;
break;
case C_SPR:
case C_FPSCR:
case C_MSR:
case C_XER:
s->set.ireg = ALL;
s->set.freg = ALL;
s->set.cc = ALL;
s->set.cr = ALL;
break;
case C_LR:
s->used.cc |= E_LR;
break;
case C_CTR:
s->used.cc |= E_CTR;
break;
case C_ZOREG:
case C_SOREG:
case C_LOREG:
c = p->from.reg;
s->used.ireg |= 1<<c;
if(ld)
p->mark |= LOAD;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->from);
m = ANYMEM;
if(c == REGSB)
m = E_MEMSB;
if(c == REGSP)
m = E_MEMSP;
s->used.cc |= m;
break;
case C_SACON:
case C_LACON:
s->used.ireg |= 1<<REGSP;
break;
case C_SECON:
case C_LECON:
s->used.ireg |= 1<<REGSB;
break;
case C_REG:
if(nr)
break;
s->used.ireg |= 1<<p->from.reg;
break;
case C_FREG:
s->used.freg |= 1<<p->from.reg;
break;
case C_SAUTO:
case C_LAUTO:
s->used.ireg |= 1<<REGSP;
if(ld)
p->mark |= LOAD;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->from);
s->used.cc |= E_MEMSP;
break;
case C_SEXT:
case C_LEXT:
s->used.ireg |= 1<<REGSB;
if(ld)
p->mark |= LOAD;
if(ad)
break;
s->size = sz;
s->soffset = regoff(&p->from);
s->used.cc |= E_MEMSB;
break;
}
c = p->reg;
if(c != NREG) {
if(p->from.type == D_FREG || p->to.type == D_FREG)
s->used.freg |= 1<<c;
else
s->used.ireg |= 1<<c;
}
}
/*
* test to see if 2 instrictions can be
* interchanged without changing semantics
*/
int
depend(Sch *sa, Sch *sb)
{
ulong x;
if(sa->set.ireg & (sb->set.ireg|sb->used.ireg))
return 1;
if(sb->set.ireg & sa->used.ireg)
return 1;
if(sa->set.freg & (sb->set.freg|sb->used.freg))
return 1;
if(sb->set.freg & sa->used.freg)
return 1;
if(sa->set.cr & (sb->set.cr|sb->used.cr))
return 1;
if(sb->set.cr & sa->used.cr)
return 1;
x = (sa->set.cc & (sb->set.cc|sb->used.cc)) |
(sb->set.cc & sa->used.cc);
if(x) {
/*
* allow SB and SP to pass each other.
* allow SB to pass SB iff doffsets are ok
* anything else conflicts
*/
if(x != E_MEMSP && x != E_MEMSB)
return 1;
x = sa->set.cc | sb->set.cc |
sa->used.cc | sb->used.cc;
if(x & E_MEM)
return 1;
if(offoverlap(sa, sb))
return 1;
}
return 0;
}
int
offoverlap(Sch *sa, Sch *sb)
{
if(sa->soffset < sb->soffset) {
if(sa->soffset+sa->size > sb->soffset)
return 1;
return 0;
}
if(sb->soffset+sb->size > sa->soffset)
return 1;
return 0;
}
/*
* test 2 adjacent instructions
* and find out if inserted instructions
* are desired to prevent stalls.
* first instruction is a load instruction.
*/
int
conflict(Sch *sa, Sch *sb)
{
if(sa->set.ireg & sb->used.ireg)
return 1;
if(sa->set.freg & sb->used.freg)
return 1;
if(sa->set.cr & sb->used.cr)
return 1;
return 0;
}
int
compound(Prog *p)
{
Optab *o;
o = oplook(p);
if(o->size != 4)
return 1;
if(p->to.type == D_REG && p->to.reg == REGSB)
return 1;
return 0;
}
void
dumpbits(Sch *s, Dep *d)
{
int i;
for(i=0; i<32; i++)
if(d->ireg & (1<<i))
Bprint(&bso, " R%d", i);
for(i=0; i<32; i++)
if(d->freg & (1<<i))
Bprint(&bso, " F%d", i);
for(i=0; i<32; i++)
if(d->cr & (1<<i))
Bprint(&bso, " C%d", i);
for(i=0; i<32; i++)
switch(d->cc & (1<<i)) {
default:
break;
case E_ICC:
Bprint(&bso, " ICC");
break;
case E_FCC:
Bprint(&bso, " FCC");
break;
case E_LR:
Bprint(&bso, " LR");
break;
case E_CR:
Bprint(&bso, " CR");
break;
case E_CTR:
Bprint(&bso, " CTR");
break;
case E_XER:
Bprint(&bso, " XER");
break;
case E_MEM:
Bprint(&bso, " MEM%d", s->size);
break;
case E_MEMSB:
Bprint(&bso, " SB%d", s->size);
break;
case E_MEMSP:
Bprint(&bso, " SP%d", s->size);
break;
}
}
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