qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-22 00:24:41 -07:00
Code Releases Activity

8g optimizer

Browse Source 
R=rsc
http://go/go-review/1025011
This commit is contained in:
Ken Thompson 2009-11-06 16:51:49 -08:00
parent 832ce7c1d2
commit 0eb2a79ff3
9 changed files with 2499 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/cmd/6g/reg.c
View File

@ -1146,7 +1146,7 @@ allreg(uint32 b, Rgn *r)
switch(v->etype) {
default:
fatal("unknown etype %d/%d", bitno(b), v->etype);
fatal("unknown etype %d/%E", bitno(b), v->etype);
break;
case TINT8:

6
src/cmd/8g/Makefile
View File

@ -11,7 +11,7 @@ HFILES=\
../gc/go.h\
../8l/8.out.h\
gg.h\
# opt.h\
opt.h\
OFILES=\
../8l/enam.$O\
@ -22,8 +22,8 @@ OFILES=\
gsubr.$O\
cgen.$O\
cgen64.$O\
# peep.$O\
# reg.$O\
peep.$O\
reg.$O\
LIB=\
../gc/gc.a$O

3
src/cmd/8g/gg.h
View File

@ -23,12 +23,13 @@ struct Addr
Prog* branch;
char sval[NSNAME];
Sym* gotype;
Sym* sym;
int width;
uchar type;
uchar index;
uchar etype;
uchar scale; /* doubles as width in DATA op */
Sym* gotype;
};
#define A ((Addr*)0)

7
src/cmd/8g/ggen.c
View File

@ -5,6 +5,7 @@
#undef EXTERN
#define EXTERN
#include "gg.h"
#include "opt.h"
void
compile(Node *fn)
@ -78,9 +79,9 @@ compile(Node *fn)
pc->as = ARET; // overwrite AEND
pc->lineno = lineno;
// if(!debug['N'] || debug['R'] || debug['P'])
// regopt(ptxt);
if(!debug['N'] || debug['R'] || debug['P']) {
regopt(ptxt);
}
// fill in argument size
ptxt->to.offset2 = rnd(curfn->type->argwid, maxround);

3
src/cmd/8g/gsubr.c
View File

@ -1714,6 +1714,7 @@ naddr(Node *n, Addr *a, int canemitcode)
// n->left is PHEAP ONAME for stack parameter.
// compute address of actual parameter on stack.
a->etype = n->left->type->etype;
a->width = n->left->type->width;
a->offset = n->xoffset;
a->sym = n->left->sym;
a->type = D_PARAM;
@ -1721,8 +1722,10 @@ naddr(Node *n, Addr *a, int canemitcode)
case ONAME:
a->etype = 0;
a->width = 0;
if(n->type != T) {
a->etype = simtype[n->type->etype];
a->width = n->type->width;
a->gotype = ngotype(n);
}
a->offset = n->xoffset;

166
src/cmd/8g/opt.h Normal file
View File

@ -0,0 +1,166 @@
// Derived from Inferno utils/6c/gc.h
// http://code.google.com/p/inferno-os/source/browse/utils/6c/gc.h
//
// 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 © 2000-2007 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 © 2000-2007 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.
#define Z N
#define Adr Addr
#define D_HI D_NONE
#define D_LO D_NONE
#define isregtype(t) ((t)>= D_AX && (t)<=D_R15)
#define BLOAD(r) band(bnot(r->refbehind), r->refahead)
#define BSTORE(r) band(bnot(r->calbehind), r->calahead)
#define LOAD(r) (~r->refbehind.b[z] & r->refahead.b[z])
#define STORE(r) (~r->calbehind.b[z] & r->calahead.b[z])
#define CLOAD 5
#define CREF 5
#define CINF 1000
#define LOOP 3
typedef struct Reg Reg;
typedef struct Rgn Rgn;
struct Reg
{
Bits set;
Bits use1;
Bits use2;
Bits refbehind;
Bits refahead;
Bits calbehind;
Bits calahead;
Bits regdiff;
Bits act;
int32 regu; // register used bitmap
int32 rpo; // reverse post ordering
int32 active;
uint16 loop; // x5 for every loop
uchar refset; // diagnostic generated
Reg* p1;
Reg* p2;
Reg* p2link;
Reg* s1;
Reg* s2;
Reg* link;
Prog* prog;
};
#define R ((Reg*)0)
#define NRGN 600
struct Rgn
{
Reg* enter;
short cost;
short varno;
short regno;
};
EXTERN int32 exregoffset; // not set
EXTERN int32 exfregoffset; // not set
EXTERN Reg* firstr;
EXTERN Reg* lastr;
EXTERN Reg zreg;
EXTERN Reg* freer;
EXTERN Reg** rpo2r;
EXTERN Rgn region[NRGN];
EXTERN Rgn* rgp;
EXTERN int nregion;
EXTERN int nvar;
EXTERN int32 regbits;
EXTERN int32 exregbits;
EXTERN Bits externs;
EXTERN Bits params;
EXTERN Bits consts;
EXTERN Bits addrs;
EXTERN Bits ovar;
EXTERN int change;
EXTERN int32 maxnr;
EXTERN int32* idom;
EXTERN struct
{
int32 ncvtreg;
int32 nspill;
int32 nreload;
int32 ndelmov;
int32 nvar;
int32 naddr;
} ostats;
/*
* reg.c
*/
Reg* rega(void);
int rcmp(const void*, const void*);
void regopt(Prog*);
void addmove(Reg*, int, int, int);
Bits mkvar(Reg*, Adr*);
void prop(Reg*, Bits, Bits);
void loopit(Reg*, int32);
void synch(Reg*, Bits);
uint32 allreg(uint32, Rgn*);
void paint1(Reg*, int);
uint32 paint2(Reg*, int);
void paint3(Reg*, int, int32, int);
void addreg(Adr*, int);
void dumpone(Reg*);
void dumpit(char*, Reg*);
int noreturn(Prog *p);
/*
* peep.c
*/
void peep(void);
void excise(Reg*);
Reg* uniqp(Reg*);
Reg* uniqs(Reg*);
int regtyp(Adr*);
int anyvar(Adr*);
int subprop(Reg*);
int copyprop(Reg*);
int copy1(Adr*, Adr*, Reg*, int);
int copyu(Prog*, Adr*, Adr*);
int copyas(Adr*, Adr*);
int copyau(Adr*, Adr*);
int copysub(Adr*, Adr*, Adr*, int);
int copysub1(Prog*, Adr*, Adr*, int);
int32 RtoB(int);
int32 FtoB(int);
int BtoR(int32);
int BtoF(int32);

865
src/cmd/8g/peep.c Normal file
View File

@ -0,0 +1,865 @@
// Derived from Inferno utils/6c/peep.c
// http://code.google.com/p/inferno-os/source/browse/utils/6c/peep.c
//
// 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 © 2000-2007 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 © 2000-2007 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"
#include "opt.h"
#define REGEXT 0
static void conprop(Reg *r);
// do we need the carry bit
static int
needc(Prog *p)
{
while(p != P) {
switch(p->as) {
case AADCL:
case ASBBL:
case ARCRL:
return 1;
case AADDL:
case ASUBL:
case AJMP:
case ARET:
case ACALL:
return 0;
default:
if(p->to.type == D_BRANCH)
return 0;
}
p = p->link;
}
return 0;
}
static Reg*
rnops(Reg *r)
{
Prog *p;
Reg *r1;
if(r != R)
for(;;) {
p = r->prog;
if(p->as != ANOP || p->from.type != D_NONE || p->to.type != D_NONE)
break;
r1 = uniqs(r);
if(r1 == R)
break;
r = r1;
}
return r;
}
void
peep(void)
{
Reg *r, *r1, *r2;
Prog *p, *p1;
int t;
/*
* complete R structure
*/
t = 0;
for(r=firstr; r!=R; r=r1) {
r1 = r->link;
if(r1 == R)
break;
p = r->prog->link;
while(p != r1->prog)
switch(p->as) {
default:
r2 = rega();
r->link = r2;
r2->link = r1;
r2->prog = p;
p->reg = r2;
r2->p1 = r;
r->s1 = r2;
r2->s1 = r1;
r1->p1 = r2;
r = r2;
t++;
case ADATA:
case AGLOBL:
case ANAME:
case ASIGNAME:
p = p->link;
}
}
// constant propagation
// find MOV $con,R followed by
// another MOV $con,R without
// setting R in the interim
for(r=firstr; r!=R; r=r->link) {
p = r->prog;
switch(p->as) {
case ALEAL:
if(regtyp(&p->to))
if(p->from.sym != S)
conprop(r);
break;
case AMOVB:
case AMOVW:
case AMOVL:
if(regtyp(&p->to))
if(p->from.type == D_CONST)
conprop(r);
break;
}
}
loop1:
if(debug['P'] && debug['v'])
dumpit("loop1", firstr);
t = 0;
for(r=firstr; r!=R; r=r->link) {
p = r->prog;
switch(p->as) {
case AMOVL:
if(regtyp(&p->to))
if(regtyp(&p->from)) {
if(copyprop(r)) {
excise(r);
t++;
} else
if(subprop(r) && copyprop(r)) {
excise(r);
t++;
}
}
break;
case AMOVBLZX:
case AMOVWLZX:
case AMOVBLSX:
case AMOVWLSX:
if(regtyp(&p->to)) {
r1 = rnops(uniqs(r));
if(r1 != R) {
p1 = r1->prog;
if(p->as == p1->as && p->to.type == p1->from.type){
p1->as = AMOVL;
t++;
}
}
}
break;
case AADDL:
case AADDW:
if(p->from.type != D_CONST || needc(p->link))
break;
if(p->from.offset == -1){
if(p->as == AADDL)
p->as = ADECL;
else
p->as = ADECW;
p->from = zprog.from;
break;
}
if(p->from.offset == 1){
if(p->as == AADDL)
p->as = AINCL;
else
p->as = AINCW;
p->from = zprog.from;
break;
}
break;
case ASUBL:
case ASUBW:
if(p->from.type != D_CONST || needc(p->link))
break;
if(p->from.offset == -1) {
if(p->as == ASUBL)
p->as = AINCL;
else
p->as = AINCW;
p->from = zprog.from;
break;
}
if(p->from.offset == 1){
if(p->as == ASUBL)
p->as = ADECL;
else
p->as = ADECW;
p->from = zprog.from;
break;
}
break;
}
}
if(t)
goto loop1;
}
void
excise(Reg *r)
{
Prog *p;
p = r->prog;
if(debug['P'] && debug['v'])
print("%P ===delete===\n", p);
p->as = ANOP;
p->from = zprog.from;
p->to = zprog.to;
ostats.ndelmov++;
}
Reg*
uniqp(Reg *r)
{
Reg *r1;
r1 = r->p1;
if(r1 == R) {
r1 = r->p2;
if(r1 == R || r1->p2link != R)
return R;
} else
if(r->p2 != R)
return R;
return r1;
}
Reg*
uniqs(Reg *r)
{
Reg *r1;
r1 = r->s1;
if(r1 == R) {
r1 = r->s2;
if(r1 == R)
return R;
} else
if(r->s2 != R)
return R;
return r1;
}
int
regtyp(Adr *a)
{
int t;
t = a->type;
if(t >= D_AX && t <= D_DI)
return 1;
return 0;
}
/*
* the idea is to substitute
* one register for another
* from one MOV to another
* MOV a, R0
* ADD b, R0 / no use of R1
* MOV R0, R1
* would be converted to
* MOV a, R1
* ADD b, R1
* MOV R1, R0
* hopefully, then the former or latter MOV
* will be eliminated by copy propagation.
*/
int
subprop(Reg *r0)
{
Prog *p;
Adr *v1, *v2;
Reg *r;
int t;
p = r0->prog;
v1 = &p->from;
if(!regtyp(v1))
return 0;
v2 = &p->to;
if(!regtyp(v2))
return 0;
for(r=uniqp(r0); r!=R; r=uniqp(r)) {
if(uniqs(r) == R)
break;
p = r->prog;
switch(p->as) {
case ACALL:
return 0;
case AIMULL:
case AIMULW:
if(p->to.type != D_NONE)
break;
case ADIVB:
case ADIVL:
case ADIVW:
case AIDIVB:
case AIDIVL:
case AIDIVW:
case AIMULB:
case AMULB:
case AMULL:
case AMULW:
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 ASALB:
case ASALL:
case ASALW:
case ASARB:
case ASARL:
case ASARW:
case ASHLB:
case ASHLL:
case ASHLW:
case ASHRB:
case ASHRL:
case ASHRW:
case AREP:
case AREPN:
case ACWD:
case ACDQ:
case ASTOSB:
case ASTOSL:
case AMOVSB:
case AMOVSL:
return 0;
case AMOVL:
if(p->to.type == v1->type)
goto gotit;
break;
}
if(copyau(&p->from, v2) ||
copyau(&p->to, v2))
break;
if(copysub(&p->from, v1, v2, 0) ||
copysub(&p->to, v1, v2, 0))
break;
}
return 0;
gotit:
copysub(&p->to, v1, v2, 1);
if(debug['P']) {
print("gotit: %D->%D\n%P", v1, v2, r->prog);
if(p->from.type == v2->type)
print(" excise");
print("\n");
}
for(r=uniqs(r); r!=r0; r=uniqs(r)) {
p = r->prog;
copysub(&p->from, v1, v2, 1);
copysub(&p->to, v1, v2, 1);
if(debug['P'])
print("%P\n", r->prog);
}
t = v1->type;
v1->type = v2->type;
v2->type = t;
if(debug['P'])
print("%P last\n", r->prog);
return 1;
}
/*
* The idea is to remove redundant copies.
* v1->v2 F=0
* (use v2 s/v2/v1/)*
* set v1 F=1
* use v2 return fail
* -----------------
* v1->v2 F=0
* (use v2 s/v2/v1/)*
* set v1 F=1
* set v2 return success
*/
int
copyprop(Reg *r0)
{
Prog *p;
Adr *v1, *v2;
Reg *r;
p = r0->prog;
v1 = &p->from;
v2 = &p->to;
if(copyas(v1, v2))
return 1;
for(r=firstr; r!=R; r=r->link)
r->active = 0;
return copy1(v1, v2, r0->s1, 0);
}
int
copy1(Adr *v1, Adr *v2, Reg *r, int f)
{
int t;
Prog *p;
if(r->active) {
if(debug['P'])
print("act set; return 1\n");
return 1;
}
r->active = 1;
if(debug['P'])
print("copy %D->%D f=%d\n", v1, v2, f);
for(; r != R; r = r->s1) {
p = r->prog;
if(debug['P'])
print("%P", p);
if(!f && uniqp(r) == R) {
f = 1;
if(debug['P'])
print("; merge; f=%d", f);
}
t = copyu(p, v2, A);
switch(t) {
case 2: /* rar, cant split */
if(debug['P'])
print("; %D rar; return 0\n", v2);
return 0;
case 3: /* set */
if(debug['P'])
print("; %D set; return 1\n", v2);
return 1;
case 1: /* used, substitute */
case 4: /* use and set */
if(f) {
if(!debug['P'])
return 0;
if(t == 4)
print("; %D used+set and f=%d; return 0\n", v2, f);
else
print("; %D used and f=%d; return 0\n", v2, f);
return 0;
}
if(copyu(p, v2, v1)) {
if(debug['P'])
print("; sub fail; return 0\n");
return 0;
}
if(debug['P'])
print("; sub %D/%D", v2, v1);
if(t == 4) {
if(debug['P'])
print("; %D used+set; return 1\n", v2);
return 1;
}
break;
}
if(!f) {
t = copyu(p, v1, A);
if(!f && (t == 2 || t == 3 || t == 4)) {
f = 1;
if(debug['P'])
print("; %D set and !f; f=%d", v1, f);
}
}
if(debug['P'])
print("\n");
if(r->s2)
if(!copy1(v1, v2, r->s2, f))
return 0;
}
return 1;
}
/*
* return
* 1 if v only used (and substitute),
* 2 if read-alter-rewrite
* 3 if set
* 4 if set and used
* 0 otherwise (not touched)
*/
int
copyu(Prog *p, Adr *v, Adr *s)
{
switch(p->as) {
default:
if(debug['P'])
print("unknown op %A\n", p->as);
/* SBBL; ADCL; FLD1; SAHF */
return 2;
case ANEGB:
case ANEGW:
case ANEGL:
case ANOTB:
case ANOTW:
case ANOTL:
if(copyas(&p->to, v))
return 2;
break;
case ALEAL: /* lhs addr, rhs store */
if(copyas(&p->from, v))
return 2;
case ANOP: /* rhs store */
case AMOVL:
case AMOVBLSX:
case AMOVBLZX:
case AMOVWLSX:
case AMOVWLZX:
if(copyas(&p->to, v)) {
if(s != A)
return copysub(&p->from, v, s, 1);
if(copyau(&p->from, v))
return 4;
return 3;
}
goto caseread;
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 ASALB:
case ASALL:
case ASALW:
case ASARB:
case ASARL:
case ASARW:
case ASHLB:
case ASHLL:
case ASHLW:
case ASHRB:
case ASHRL:
case ASHRW:
if(copyas(&p->to, v))
return 2;
if(copyas(&p->from, v))
if(p->from.type == D_CX)
return 2;
goto caseread;
case AADDB: /* rhs rar */
case AADDL:
case AADDW:
case AANDB:
case AANDL:
case AANDW:
case ADECL:
case ADECW:
case AINCL:
case AINCW:
case ASUBB:
case ASUBL:
case ASUBW:
case AORB:
case AORL:
case AORW:
case AXORB:
case AXORL:
case AXORW:
case AMOVB:
case AMOVW:
if(copyas(&p->to, v))
return 2;
goto caseread;
case ACMPL: /* read only */
case ACMPW:
case ACMPB:
caseread:
if(s != A) {
if(copysub(&p->from, v, s, 1))
return 1;
return copysub(&p->to, v, s, 1);
}
if(copyau(&p->from, v))
return 1;
if(copyau(&p->to, v))
return 1;
break;
case AJGE: /* no reference */
case AJNE:
case AJLE:
case AJEQ:
case AJHI:
case AJLS:
case AJMI:
case AJPL:
case AJGT:
case AJLT:
case AJCC:
case AJCS:
case AADJSP:
case AWAIT:
case ACLD:
break;
case AIMULL:
case AIMULW:
if(p->to.type != D_NONE) {
if(copyas(&p->to, v))
return 2;
goto caseread;
}
case ADIVB:
case ADIVL:
case ADIVW:
case AIDIVB:
case AIDIVL:
case AIDIVW:
case AIMULB:
case AMULB:
case AMULL:
case AMULW:
case ACWD:
case ACDQ:
if(v->type == D_AX || v->type == D_DX)
return 2;
goto caseread;
case AREP:
case AREPN:
if(v->type == D_CX)
return 2;
goto caseread;
case AMOVSB:
case AMOVSL:
if(v->type == D_DI || v->type == D_SI)
return 2;
goto caseread;
case ASTOSB:
case ASTOSL:
if(v->type == D_AX || v->type == D_DI)
return 2;
goto caseread;
case AJMP: /* funny */
if(s != A) {
if(copysub(&p->to, v, s, 1))
return 1;
return 0;
}
if(copyau(&p->to, v))
return 1;
return 0;
case ARET: /* funny */
if(v->type == REGRET || v->type == FREGRET)
return 2;
if(s != A)
return 1;
return 3;
case ACALL: /* funny */
if(REGEXT && v->type <= REGEXT && v->type > exregoffset)
return 2;
if(REGARG >= 0 && v->type == (uchar)REGARG)
return 2;
if(s != A) {
if(copysub(&p->to, v, s, 1))
return 1;
return 0;
}
if(copyau(&p->to, v))
return 4;
return 3;
case ATEXT: /* funny */
if(REGARG >= 0 && v->type == (uchar)REGARG)
return 3;
return 0;
}
return 0;
}
/*
* direct reference,
* could be set/use depending on
* semantics
*/
int
copyas(Adr *a, Adr *v)
{
if(a->type != v->type)
return 0;
if(regtyp(v))
return 1;
if(v->type == D_AUTO || v->type == D_PARAM)
if(v->offset == a->offset)
return 1;
return 0;
}
/*
* either direct or indirect
*/
int
copyau(Adr *a, Adr *v)
{
if(copyas(a, v))
return 1;
if(regtyp(v)) {
if(a->type-D_INDIR == v->type)
return 1;
if(a->index == v->type)
return 1;
}
return 0;
}
/*
* substitute s for v in a
* return failure to substitute
*/
int
copysub(Adr *a, Adr *v, Adr *s, int f)
{
int t;
if(copyas(a, v)) {
t = s->type;
if(t >= D_AX && t <= D_DI) {
if(f)
a->type = t;
}
return 0;
}
if(regtyp(v)) {
t = v->type;
if(a->type == t+D_INDIR) {
if((s->type == D_BP) && a->index != D_NONE)
return 1; /* can't use BP-base with index */
if(f)
a->type = s->type+D_INDIR;
// return 0;
}
if(a->index == t) {
if(f)
a->index = s->type;
return 0;
}
return 0;
}
return 0;
}
static void
conprop(Reg *r0)
{
Reg *r;
Prog *p, *p0;
int t;
Adr *v0;
p0 = r0->prog;
v0 = &p0->to;
r = r0;
loop:
r = uniqs(r);
if(r == R || r == r0)
return;
if(uniqp(r) == R)
return;
p = r->prog;
t = copyu(p, v0, A);
switch(t) {
case 0: // miss
case 1: // use
goto loop;
case 2: // rar
case 4: // use and set
break;
case 3: // set
if(p->as == p0->as)
if(p->from.type == p0->from.type)
if(p->from.sym == p0->from.sym)
if(p->from.offset == p0->from.offset)
if(p->from.scale == p0->from.scale)
if(p->from.dval == p0->from.dval)
if(p->from.index == p0->from.index) {
excise(r);
t++;
goto loop;
}
break;
}
}

1449
src/cmd/8g/reg.c Normal file
View File

File diff suppressed because it is too large Load Diff

12
src/cmd/gc/go.h
View File

@ -408,25 +408,25 @@ enum
TFLOAT64,
TFLOAT,
TBOOL, // 16
TBOOL, // 15
TPTR32, TPTR64, // 17
TPTR32, TPTR64, // 16
TDDD, // 19
TDDD, // 18
TFUNC,
TARRAY,
T_old_DARRAY,
TSTRUCT, // 23
TSTRUCT, // 22
TCHAN,
TMAP,
TINTER, // 26
TINTER, // 25
TFORW,
TFIELD,
TANY,
TSTRING,
// pseudo-types for literals
TIDEAL,
TIDEAL, // 30
TNIL,
TBLANK,