1058 lines
15 KiB
C
1058 lines
15 KiB
C
#include "gc.h"
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void
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peep(void)
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{
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Reg *r, *r1, *r2;
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Prog *p, *p1;
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int t, s;
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/*
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* complete R structure
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*/
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t = 0;
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for(r=firstr; r!=R; r=r1) {
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r1 = r->link;
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if(r1 == R)
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break;
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p = r->prog->link;
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while(p != r1->prog)
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switch(p->as) {
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default:
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r2 = rega();
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r->link = r2;
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r2->link = r1;
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r2->prog = p;
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r2->p1 = r;
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r->s1 = r2;
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r2->s1 = r1;
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r1->p1 = r2;
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r = r2;
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t++;
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case ADATA:
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case AGLOBL:
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case ANAME:
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case ASIGNAME:
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p = p->link;
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}
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}
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loop1:
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/*
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* propigate move's by renaming
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*/
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t = 0;
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for(r=firstr; r!=R; r=r->link) {
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p = r->prog;
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if(p->as == AMOVL || p->as == AFMOVEF || p->as == AFMOVED)
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if(regtyp(p->from.type))
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if(anyvar(&p->to)) {
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if(copyprop(r)) {
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excise(r);
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t++;
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} else
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if(subprop(r) && copyprop(r)) {
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excise(r);
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t++;
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}
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}
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}
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if(t)
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goto loop1;
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for(r=firstr; r!=R; r=r->link) {
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p = r->prog;
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/*
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* convert (A) ... A++ into (A)++
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* and A-- ... (A) into --(A)
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*/
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t = aregind(&p->from);
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if(t == D_NONE)
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goto out1;
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s = asize(p->as);
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if(s == 0)
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goto out1;
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r1 = findop(r, t, AADDL, s);
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if(r1 != R) {
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if(usedin(t, &p->to))
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goto out1;
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p->from.type += I_INDINC - I_INDIR;
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excise(r1);
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goto out1;
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}
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r1 = findop(r, t, ASUBL, s);
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if(r1 != R) {
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p->from.type += I_INDDEC - I_INDIR;
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excise(r1);
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}
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out1:
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t = aregind(&p->to);
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if(t == D_NONE)
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goto out2;
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s = asize(p->as);
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if(s == 0)
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goto out2;
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r1 = findop(r, t, AADDL, s);
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if(r1 != R) {
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p->to.type += I_INDINC - I_INDIR;
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excise(r1);
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goto out2;
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}
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r1 = findop(r, t, ASUBL, s);
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if(r1 != R) {
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if(usedin(t, &p->from))
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goto out2;
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p->to.type += I_INDDEC - I_INDIR;
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excise(r1);
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}
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out2:
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/*
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* get rid of unneeded save/restore CCR
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*/
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if(p->from.type == D_CCR) {
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r1 = findccr(r);
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if(r1 != R) {
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excise(r);
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excise(r1);
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}
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}
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switch(p->as) {
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case ATSTB:
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case ATSTW:
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case ATSTL:
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if(findtst(r, r->prog, 0))
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excise(r);
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}
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/*
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* turn TSTB (A); BLT; ORB $128,(A) into TAS (A); BLT; NOP
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*/
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if(p->as == ATSTB && (r1 = r->s1)) {
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if((r1->prog->as == ABLT && (r2 = r1->s1)) ||
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(r1->prog->as == ABGE && (r2 = r1->s2))) {
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p1 = r2->prog;
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if(p1->as == AORB)
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if(p1->from.type == D_CONST)
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if(p1->from.offset == 128)
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if(r1 == uniqp(r2))
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if(tasas(&p->to, &p1->to)) {
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p->as = ATAS;
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excise(r2);
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}
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}
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}
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}
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}
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void
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excise(Reg *r)
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{
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p = r->prog;
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p->as = ANOP;
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p->from = zprog.from;
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p->to = zprog.to;
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}
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Reg*
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uniqp(Reg *r)
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{
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Reg *r1;
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r1 = r->p1;
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if(r1 == R) {
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r1 = r->p2;
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if(r1 == R || r1->p2link != R)
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return R;
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} else
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if(r->p2 != R)
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return R;
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return r1;
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}
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Reg*
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uniqs(Reg *r)
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{
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Reg *r1;
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r1 = r->s1;
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if(r1 == R) {
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r1 = r->s2;
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if(r1 == R)
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return R;
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} else
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if(r->s2 != R)
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return R;
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return r1;
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}
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/*
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* chase backward all cc setting.
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* returns 1 if all set same.
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*/
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int
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findtst(Reg *r0, Prog *rp, int n)
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{
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Reg *r;
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int c;
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loop:
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n++;
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if(n >= 10)
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return 0;
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for(r=r0->p2; r!=R; r=r->p2link) {
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c = setcc(r->prog, rp);
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if(c > 0)
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continue;
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if(c == 0)
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return 0;
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if(findtst(r, rp, n) == 0)
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return 0;
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}
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r = r0->p1;
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if(r == R)
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return 1;
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c = setcc(r->prog, rp);
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if(c > 0)
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return 1;
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if(c == 0)
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return 0;
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r0 = r;
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goto loop;
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}
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/*
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* tests cc
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* returns -1 if no change
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* returns 1 if set the same
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* returns 0 if set different
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*/
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int
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setcc(Prog *p, Prog *rp)
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{
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int s;
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s = asize(rp->as);
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switch(p->as) {
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default:
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if(debug['P'])
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print("unknown setcc %A\n", p->as);
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break;
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case ACMPB:
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case ACMPW:
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case ACMPL:
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case ABSR:
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return 0;
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case ABRA:
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case ABGE:
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case ABNE:
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case ABLE:
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case ABEQ:
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case ABHI:
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case ABLS:
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case ABMI:
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case ABPL:
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case ABGT:
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case ABLT:
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case ABCC:
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case ABCS:
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case APEA:
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case ALEA:
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case ANOP:
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case AFADDD:
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case AFMULD:
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case AFDIVD:
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case AFSUBD:
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case AFADDF:
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case AFMULF:
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case AFDIVF:
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case AFSUBF:
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case AADJSP:
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return -1;
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case AADDW:
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case AADDL:
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case ASUBW:
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case ASUBL:
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case ACLRL:
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case ACLRW:
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if(p->to.type >= D_A0 && p->to.type < D_A0+8)
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goto areg;
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case AADDB:
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case ASUBB:
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case AANDB:
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case AANDW:
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case AANDL:
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case AORB:
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case AORW:
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case AORL:
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case AEORB:
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case AEORW:
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case AEORL:
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case ALSLB:
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case ALSLW:
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case ALSLL:
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case ALSRB:
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case ALSRW:
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case ALSRL:
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case AASLB:
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case AASLW:
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case AASLL:
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case AASRB:
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case AASRW:
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case AASRL:
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case ATSTB:
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case ATSTW:
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case ATSTL:
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case ANEGB:
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case ANEGW:
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case ANEGL:
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case ACLRB:
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if(asize(p->as) != s)
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break;
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if(compat(&rp->to, &p->to))
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return 1;
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break;
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case AMOVW:
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case AMOVL:
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if(p->to.type >= D_A0 && p->to.type < D_A0+8)
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goto areg;
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case AMOVB:
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if(asize(p->as) != s)
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break;
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if(compat(&rp->to, &p->to))
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return 1;
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if(compat(&rp->to, &p->from))
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return 1;
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}
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return 0;
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areg:
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if((rp->to.type&D_MASK) == p->to.type)
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return 0;
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return -1;
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}
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int
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compat(Adr *a, Adr *b)
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{
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int o;
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o = a->type;
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if((o >= D_R0 && o < D_R0+NREG) ||
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(o >= D_A0 && o < D_A0+NREG))
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return o == b->type;
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o &= D_MASK;
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if(o >= D_A0 && o < D_A0+NREG) {
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if(o != (b->type&D_MASK))
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return 0;
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if(a->offset != b->offset)
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return 0;
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o = a->type & I_MASK;
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if(o == I_INDIR) {
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o = b->type & I_MASK;
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if(o == I_INDIR || o == I_INDDEC)
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return 1;
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return 0;
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}
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if(o == I_INDINC) {
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o = b->type & I_MASK;
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if(o == I_INDIR) {
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b->type += I_INDINC-I_INDIR;
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return 1;
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}
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if(o == I_INDDEC) {
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b->type += I_INDIR-I_INDDEC;
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return 1;
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}
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return 0;
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}
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}
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return 0;
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}
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int
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aregind(Adr *a)
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{
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int t;
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t = a->type;
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if(t >= (D_A0|I_INDIR) && t < ((D_A0+NREG)|I_INDIR))
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while(a->offset == 0)
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return t & D_MASK;
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return D_NONE;
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}
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int
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asize(int a)
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{
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switch(a) {
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case AFTSTD:
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case AFMOVED:
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case AFADDD:
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case AFSUBD:
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case AFMULD:
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case AFDIVD:
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case AFCMPD:
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case AFNEGD:
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return 8;
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|
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case AFTSTF:
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case AFMOVEF:
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case AFADDF:
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case AFSUBF:
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case AFMULF:
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case AFDIVF:
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case AFCMPF:
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case AFNEGF:
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case ACLRL:
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case ATSTL:
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case AMOVL:
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case AADDL:
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case ASUBL:
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case ACMPL:
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case AANDL:
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case AORL:
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case AEORL:
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case ALSLL:
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case ALSRL:
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case AASLL:
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case AASRL:
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case ANEGL:
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return 4;
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case ACLRW:
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case ATSTW:
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case AMOVW:
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case AADDW:
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case ASUBW:
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case ACMPW:
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case AANDW:
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case AORW:
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case AEORW:
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case ALSLW:
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case ALSRW:
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case AASLW:
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case AASRW:
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case ANEGW:
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return 2;
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|
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case ACLRB:
|
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case ATSTB:
|
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case AMOVB:
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case AADDB:
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case ASUBB:
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case ACMPB:
|
|
case AANDB:
|
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case AORB:
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case AEORB:
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case ALSLB:
|
|
case ALSRB:
|
|
case AASLB:
|
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case AASRB:
|
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case ANEGB:
|
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return 1;
|
|
}
|
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if(debug['P'])
|
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print("unknown asize %A\n", p->as);
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return 0;
|
|
}
|
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|
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int
|
|
usedin(int t, Adr *a)
|
|
{
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|
|
|
if((a->type&D_MASK) == t)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
Reg*
|
|
findccr(Reg *r)
|
|
{
|
|
Prog *p;
|
|
|
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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;
|
|
}
|