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- #include "gc.h"
- void
- peep(void)
- {
- Reg *r, *r1, *r2;
- Prog *p, *p1;
- int t, s;
- /*
- * 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;
- 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;
- }
- }
- loop1:
- /*
- * propigate move's by renaming
- */
- t = 0;
- for(r=firstr; r!=R; r=r->link) {
- p = r->prog;
- if(p->as == AMOVL || p->as == AFMOVEF || p->as == AFMOVED)
- if(regtyp(p->from.type))
- if(anyvar(&p->to)) {
- if(copyprop(r)) {
- excise(r);
- t++;
- } else
- if(subprop(r) && copyprop(r)) {
- excise(r);
- t++;
- }
- }
- }
- if(t)
- goto loop1;
- for(r=firstr; r!=R; r=r->link) {
- p = r->prog;
- /*
- * convert (A) ... A++ into (A)++
- * and A-- ... (A) into --(A)
- */
- t = aregind(&p->from);
- if(t == D_NONE)
- goto out1;
- s = asize(p->as);
- if(s == 0)
- goto out1;
- r1 = findop(r, t, AADDL, s);
- if(r1 != R) {
- if(usedin(t, &p->to))
- goto out1;
- p->from.type += I_INDINC - I_INDIR;
- excise(r1);
- goto out1;
- }
- r1 = findop(r, t, ASUBL, s);
- if(r1 != R) {
- p->from.type += I_INDDEC - I_INDIR;
- excise(r1);
- }
- out1:
- t = aregind(&p->to);
- if(t == D_NONE)
- goto out2;
- s = asize(p->as);
- if(s == 0)
- goto out2;
- r1 = findop(r, t, AADDL, s);
- if(r1 != R) {
- p->to.type += I_INDINC - I_INDIR;
- excise(r1);
- goto out2;
- }
- r1 = findop(r, t, ASUBL, s);
- if(r1 != R) {
- if(usedin(t, &p->from))
- goto out2;
- p->to.type += I_INDDEC - I_INDIR;
- excise(r1);
- }
- out2:
- /*
- * get rid of unneeded save/restore CCR
- */
- if(p->from.type == D_CCR) {
- r1 = findccr(r);
- if(r1 != R) {
- excise(r);
- excise(r1);
- }
- }
- switch(p->as) {
- case ATSTB:
- case ATSTW:
- case ATSTL:
- if(findtst(r, r->prog, 0))
- excise(r);
- }
- /*
- * turn TSTB (A); BLT; ORB $128,(A) into TAS (A); BLT; NOP
- */
- if(p->as == ATSTB && (r1 = r->s1)) {
- if((r1->prog->as == ABLT && (r2 = r1->s1)) ||
- (r1->prog->as == ABGE && (r2 = r1->s2))) {
- p1 = r2->prog;
- if(p1->as == AORB)
- if(p1->from.type == D_CONST)
- if(p1->from.offset == 128)
- if(r1 == uniqp(r2))
- if(tasas(&p->to, &p1->to)) {
- p->as = ATAS;
- excise(r2);
- }
- }
- }
- }
- }
- void
- excise(Reg *r)
- {
- p = r->prog;
- p->as = ANOP;
- p->from = zprog.from;
- p->to = zprog.to;
- }
- 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;
- }
- /*
- * chase backward all cc setting.
- * returns 1 if all set same.
- */
- int
- findtst(Reg *r0, Prog *rp, int n)
- {
- Reg *r;
- int c;
- loop:
- n++;
- if(n >= 10)
- return 0;
- for(r=r0->p2; r!=R; r=r->p2link) {
- c = setcc(r->prog, rp);
- if(c > 0)
- continue;
- if(c == 0)
- return 0;
- if(findtst(r, rp, n) == 0)
- return 0;
- }
- r = r0->p1;
- if(r == R)
- return 1;
- c = setcc(r->prog, rp);
- if(c > 0)
- return 1;
- if(c == 0)
- return 0;
- r0 = r;
- goto loop;
- }
- /*
- * tests cc
- * returns -1 if no change
- * returns 1 if set the same
- * returns 0 if set different
- */
- int
- setcc(Prog *p, Prog *rp)
- {
- int s;
- s = asize(rp->as);
- switch(p->as) {
- default:
- if(debug['P'])
- print("unknown setcc %A\n", p->as);
- break;
- case ACMPB:
- case ACMPW:
- case ACMPL:
- case ABSR:
- return 0;
- case ABRA:
- case ABGE:
- case ABNE:
- case ABLE:
- case ABEQ:
- case ABHI:
- case ABLS:
- case ABMI:
- case ABPL:
- case ABGT:
- case ABLT:
- case ABCC:
- case ABCS:
- case APEA:
- case ALEA:
- case ANOP:
- case AFADDD:
- case AFMULD:
- case AFDIVD:
- case AFSUBD:
- case AFADDF:
- case AFMULF:
- case AFDIVF:
- case AFSUBF:
- case AADJSP:
- return -1;
- case AADDW:
- case AADDL:
- case ASUBW:
- case ASUBL:
- case ACLRL:
- case ACLRW:
- if(p->to.type >= D_A0 && p->to.type < D_A0+8)
- goto areg;
- case AADDB:
- case ASUBB:
- case AANDB:
- case AANDW:
- case AANDL:
- case AORB:
- case AORW:
- case AORL:
- case AEORB:
- case AEORW:
- case AEORL:
- case ALSLB:
- case ALSLW:
- case ALSLL:
- case ALSRB:
- case ALSRW:
- case ALSRL:
- case AASLB:
- case AASLW:
- case AASLL:
- case AASRB:
- case AASRW:
- case AASRL:
- case ATSTB:
- case ATSTW:
- case ATSTL:
- case ANEGB:
- case ANEGW:
- case ANEGL:
- case ACLRB:
- if(asize(p->as) != s)
- break;
- if(compat(&rp->to, &p->to))
- return 1;
- break;
- case AMOVW:
- case AMOVL:
- if(p->to.type >= D_A0 && p->to.type < D_A0+8)
- goto areg;
- case AMOVB:
- if(asize(p->as) != s)
- break;
- if(compat(&rp->to, &p->to))
- return 1;
- if(compat(&rp->to, &p->from))
- return 1;
- }
- return 0;
- areg:
- if((rp->to.type&D_MASK) == p->to.type)
- return 0;
- return -1;
- }
- int
- compat(Adr *a, Adr *b)
- {
- int o;
- o = a->type;
- if((o >= D_R0 && o < D_R0+NREG) ||
- (o >= D_A0 && o < D_A0+NREG))
- return o == b->type;
- o &= D_MASK;
- if(o >= D_A0 && o < D_A0+NREG) {
- if(o != (b->type&D_MASK))
- return 0;
- if(a->offset != b->offset)
- return 0;
- o = a->type & I_MASK;
- if(o == I_INDIR) {
- o = b->type & I_MASK;
- if(o == I_INDIR || o == I_INDDEC)
- return 1;
- return 0;
- }
- if(o == I_INDINC) {
- o = b->type & I_MASK;
- if(o == I_INDIR) {
- b->type += I_INDINC-I_INDIR;
- return 1;
- }
- if(o == I_INDDEC) {
- b->type += I_INDIR-I_INDDEC;
- return 1;
- }
- return 0;
- }
- }
- return 0;
- }
- int
- aregind(Adr *a)
- {
- int t;
- t = a->type;
- if(t >= (D_A0|I_INDIR) && t < ((D_A0+NREG)|I_INDIR))
- while(a->offset == 0)
- return t & D_MASK;
- return D_NONE;
- }
- int
- asize(int a)
- {
- switch(a) {
- case AFTSTD:
- case AFMOVED:
- case AFADDD:
- case AFSUBD:
- case AFMULD:
- case AFDIVD:
- case AFCMPD:
- case AFNEGD:
- return 8;
- case AFTSTF:
- case AFMOVEF:
- case AFADDF:
- case AFSUBF:
- case AFMULF:
- case AFDIVF:
- case AFCMPF:
- case AFNEGF:
- case ACLRL:
- case ATSTL:
- case AMOVL:
- case AADDL:
- case ASUBL:
- case ACMPL:
- case AANDL:
- case AORL:
- case AEORL:
- case ALSLL:
- case ALSRL:
- case AASLL:
- case AASRL:
- case ANEGL:
- return 4;
- case ACLRW:
- case ATSTW:
- case AMOVW:
- case AADDW:
- case ASUBW:
- case ACMPW:
- case AANDW:
- case AORW:
- case AEORW:
- case ALSLW:
- case ALSRW:
- case AASLW:
- case AASRW:
- case ANEGW:
- return 2;
- case ACLRB:
- case ATSTB:
- case AMOVB:
- case AADDB:
- case ASUBB:
- case ACMPB:
- case AANDB:
- case AORB:
- case AEORB:
- case ALSLB:
- case ALSRB:
- case AASLB:
- case AASRB:
- case ANEGB:
- return 1;
- }
- if(debug['P'])
- print("unknown asize %A\n", p->as);
- return 0;
- }
- int
- usedin(int t, Adr *a)
- {
- if((a->type&D_MASK) == t)
- return 1;
- return 0;
- }
- Reg*
- findccr(Reg *r)
- {
- Prog *p;
- for(;;) {
- r = uniqs(r);
- if(r == R)
- break;
- p = r->prog;
- if(p->to.type == D_CCR)
- return r;
- if(setccr(p))
- break;
- }
- return R;
- }
- int
- setccr(Prog *p)
- {
- switch(p->as) {
- case ANOP:
- return 0;
- case AADDL:
- case AMOVL:
- case ACLRL:
- if(p->to.type >= D_A0 && p->to.type < D_A0+8)
- return 0;
- }
- return 1;
- }
- Reg*
- findop(Reg *r, int t, int o, int s)
- {
- Prog *p;
- Reg *r1;
- for(;;) {
- if(o == AADDL) {
- r1 = uniqs(r);
- if(r1 == R)
- break;
- if(uniqp(r1) != r)
- break;
- } else {
- r1 = uniqp(r);
- if(r1 == R)
- break;
- if(uniqs(r1) != r)
- break;
- }
- r = r1;
- p = r->prog;
- if(usedin(t, &p->from))
- break;
- if(usedin(t, &p->to)) {
- if(p->as == o)
- if(p->to.type == t)
- if(p->from.type == D_CONST)
- if(p->from.offset == s)
- return r;
- break;
- }
- }
- return R;
- }
- int
- regtyp(int t)
- {
- if(t >= D_R0 && t < D_R0+8)
- return 1;
- if(t >= D_A0 && t < D_A0+8)
- return 1;
- if(t >= D_F0 && t < D_F0+8)
- return 1;
- return 0;
- }
- int
- anyvar(Adr *a)
- {
- if(regtyp(a->type))
- 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 MOVL
- * 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->type))
- return 0;
- v2 = &p->to;
- if(!regtyp(v2->type))
- return 0;
- for(r=uniqp(r0); r!=R; r=uniqp(r)) {
- if(uniqs(r) == R)
- break;
- p = r->prog;
- switch(p->as) {
- case ADIVUW: /* these set Rn and Rn+1 */
- case ADIVUL:
- case ADIVSW:
- case ADIVSL:
- case ABSR:
- return 0;
- case AFMOVED:
- case AFMOVEF:
- case AMOVL:
- if(p->to.type == v1->type)
- goto gotit;
- }
- if(copyau(&p->from, v2) || copyau(&p->to, v2))
- break;
- if(copysub(&p->from, v1, v2, p, 0) || copysub(&p->to, v1, v2, p, 0))
- break;
- }
- return 0;
- gotit:
- copysub(&p->to, v1, v2, p, 1);
- if(debug['P']) {
- print("gotit: %D->%D\n%P", v1, v2, r->prog);
- if(p->from.type == v2->type)
- print(" excise");
- print("\n");
- }
- if(p->from.type == v2->type)
- excise(r);
- for(r=uniqs(r); r!=r0; r=uniqs(r)) {
- p = r->prog;
- copysub(&p->from, v1, v2, p, 1);
- copysub(&p->to, v1, v2, p, 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;
- if(r->active) {
- if(debug['P'])
- print("copyret 1\n");
- return 1;
- }
- r->active = 1;
- if(debug['P'])
- print("copy %D->%D\n", v1, v2);
- for(; r != R; r = r->s1) {
- if(debug['P'])
- print("%P", r->prog);
- if(!f && uniqp(r) == R) {
- f = 1;
- if(debug['P'])
- print("; merge; f=%d", f);
- }
- t = copyu(r->prog, v2, A);
- switch(t) {
- case 2: /* rar, cant split */
- if(debug['P'])
- print("; rar return 0\n");
- return 0;
- case 3: /* set */
- if(debug['P'])
- print("; set; return 1\n");
- return 1;
- case 1: /* used, substitute */
- case 4: /* use and set */
- if(f) {
- if(debug['P'])
- print("; used and f; return 0\n");
- return 0;
- }
- if(copyu(r->prog, v2, v1)) {
- if(debug['P'])
- print("; sub fail; return 0\n");
- return 0;
- }
- if(debug['P'])
- print("; substitute");
- if(t == 4) {
- if(debug['P'])
- print("; used and set; return 1\n");
- return 1;
- }
- break;
- }
- if(!f) {
- t = copyu(r->prog, v1, A);
- if(!f && (t == 2 || t == 3 || t == 4)) {
- if(debug['P'])
- print("; f set used");
- f = 1;
- }
- }
- 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)
- {
- int t;
- switch(p->as) {
- default:
- if(debug['P'])
- print("unknown op %A\n", p->as);
- return 2;
- case APEA: /* rhs addr */
- if(copyas(&p->to, v))
- return 2;
- goto caseread;
- case ALEA: /* lhs addr, rhs store */
- if(copyas(&p->from, v))
- return 2;
- case AMOVL: /* rhs store */
- case ACLRL:
- case AFMOVEF:
- case AFMOVED:
- case AFMOVEB:
- case AFMOVEW:
- case AFMOVEL:
- case ANOP:
- if(copyas(&p->to, v)) {
- if(s != A)
- return copysub(&p->from, v, s, p, 1);
- if(copyau(&p->from, v))
- return 4;
- return 3;
- }
- goto caseread;
-
- case AADDL: /* rhs rar */
- case AADDW:
- case AADDB:
- case ASUBL:
- case ASUBW:
- case ASUBB:
- case AANDL:
- case AANDW:
- case AANDB:
- case AORL:
- case AORW:
- case AORB:
- case AEORL:
- case AEORW:
- case AEORB:
- case AASRL:
- case AASRW:
- case AASRB:
- case AASLL:
- case AASLW:
- case AASLB:
- case ALSRL:
- case ALSRW:
- case ALSRB:
- case ANOTL:
- case ANOTW:
- case ANOTB:
- case ANEGL:
- case ANEGW:
- case ANEGB:
- case AEXTBL:
- case AEXTWL:
- case AEXTBW:
- case AMULSL:
- case AMULUL:
- case AMOVW: /* only sets part of register */
- case AMOVB:
- case ACLRW:
- case ACLRB:
- case AFADDD:
- case AFMULD:
- case AFDIVD:
- case AFSUBD:
- case AFNEGD:
- case AFADDF:
- case AFMULF:
- case AFDIVF:
- case AFSUBF:
- case AFNEGF:
- if(copyas(&p->to, v))
- return 2;
- goto caseread;
- case ADBF: /* lhs rar */
- if(copyas(&p->from, v))
- return 2;
- goto caseread;
- case ACMPL: /* read only */
- case ACMPW:
- case ACMPB:
- case AFCMPF:
- case AFCMPD:
- case ATSTL:
- case ATSTW:
- case ATSTB:
- case AFTSTF:
- case AFTSTD:
- caseread:
- if(s != A) {
- if(copysub(&p->from, v, s, p, 1))
- return 1;
- return copysub(&p->to, v, s, p, 1);
- }
- if(copyau(&p->from, v))
- return 1;
- if(copyau(&p->to, v))
- return 1;
- break;
- case ABRA: /* no reference */
- case ABGE:
- case ABNE:
- case ABLE:
- case ABEQ:
- case ABHI:
- case ABLS:
- case ABMI:
- case ABPL:
- case ABGT:
- case ABLT:
- case ABCC:
- case ABCS:
- case AFBEQ:
- case AFBNE:
- case AFBGT:
- case AFBGE:
- case AFBLE:
- case AFBLT:
- case AADJSP:
- case ACASEW:
- break;
- case ADIVUW: /* these set Rn and Rn+1 */
- case ADIVUL:
- case ADIVSW:
- case ADIVSL:
- t = v->type;
- if(t == p->to.type || t == p->to.type+1)
- return 2;
- goto caseread;
- case ARTS: /* funny */
- t = v->type;
- if(t == D_R0 || t == D_F0)
- return 2;
- if(t >= D_R0 && t < D_R0+NREG)
- if(t-D_R0 > exregoffset)
- return 2;
- if(t >= D_A0 && t < D_A0+NREG)
- if(t-D_A0 > exaregoffset)
- return 2;
- if(t >= D_F0 && t < D_F0+NREG)
- if(t-D_F0 > exfregoffset)
- return 2;
- return 3;
- case ABSR: /* funny */
- t = v->type;
- if(t >= D_R0 && t < D_R0+NREG)
- if(t-D_R0 > exregoffset)
- return 2;
- if(t >= D_A0 && t < D_A0+NREG)
- if(t-D_A0 > exaregoffset)
- return 2;
- if(t >= D_F0 && t < D_F0+NREG)
- if(t-D_F0 > exfregoffset)
- return 2;
- if(copyau(&p->to, v))
- return 2;
- return 3;
- }
- 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->type))
- return 1;
- if(v->type == D_AUTO || v->type == D_PARAM) {
- if(v->offset == a->offset)
- return 1;
- return 0;
- }
- return 0;
- }
- /*
- * indirect
- */
- int
- tasas(Adr *a, Adr *v)
- {
- int t;
- t = a->type;
- if(t < I_INDIR+D_A0 && t >= I_INDIR+D_A0+8)
- return 0;
- if(v->type != t)
- return 0;
- if(a->displace != v->displace)
- return 0;
- return 1;
- }
- /*
- * either direct or indirect
- */
- int
- copyau(Adr *a, Adr *v)
- {
- int t;
- if(copyas(a, v))
- return 1;
- t = v->type;
- if(regtyp(t)) {
- if((a->type & D_MASK) == t)
- return 1;
- }
- return 0;
- }
- /*
- * substitute s for v in a
- * return failure to substitute
- */
- int
- copysub(Adr *a, Adr *v, Adr *s, Prog *p, int f)
- {
- int t;
- if(copyas(a, v)) {
- t = s->type;
- if(t >= D_F0 && t < D_F0+8) {
- if(f)
- a->type = t;
- return 0;
- }
- if(t >= D_R0 && t < D_R0+8) {
- if(f)
- a->type = t;
- return 0;
- }
- if(!(t >= D_A0 && t < D_A0+8))
- return 1;
- switch(p->as) {
- default:
- return 1;
- case AMOVL:
- case AMOVW:
- case ACMPL:
- case ACMPW:
- break;
- case AADDL:
- case AADDW:
- case ASUBL:
- case ASUBW:
- if(a == &p->from && !regtyp(p->to.type))
- return 1;
- break;
- }
- if(f)
- a->type = t;
- return 0;
- }
- t = v->type;
- if(regtyp(t)) {
- if((a->type & D_MASK) == t) {
- if((s->type ^ t) & ~(NREG-1))
- return 1;
- if(f)
- a->type = (a->type & ~D_MASK) | s->type;
- return 0;
- }
- return 0;
- }
- return 0;
- }
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