xr16.md

This free cpu-ip! use verilog

        p->syms[2] = intconst(mkactual(align,
                p->syms[0]->u.c.v.i));
}
static void local(Symbol p) {
        if (askregvar(p, rmap(ttob(p->type))) == 0)
                mkauto(p);
}
static void function(Symbol f, Symbol caller[], Symbol callee[], int ncalls) {
        int i, saved, sizefsave, sizeisave, varargs;
        Symbol r, argregs[NUM_ARG_REGS];

        usedmask[0] = usedmask[1] = 0;
        freemask[0] = freemask[1] = ~(unsigned)0;
        offset = maxoffset = maxargoffset = 0;
        for (i = 0; callee[i]; i++)
                ;
        varargs = variadic(f->type)
                || i > 0 && strcmp(callee[i-1]->name, "va_alist") == 0;
        for (i = 0; callee[i]; i++) {
                Symbol p = callee[i];
                Symbol q = caller[i];
                assert(q);
                offset = roundup(offset, q->type->align);
                p->x.offset = q->x.offset = offset;
                p->x.name = q->x.name = stringd(offset);
                r = argreg(i, offset, optype(ttob(q->type)), q->type->size, optype(ttob(caller[0]->type)));
                if (i < NUM_ARG_REGS)
                        argregs[i] = r;
                offset = roundup(offset + q->type->size, 2);
                if (varargs)
                        p->sclass = AUTO;
                else if (r && ncalls == 0 &&
                         !isstruct(q->type) && !p->addressed &&
                         !(isfloat(q->type) && r->x.regnode->set == IREG)
) {
                        p->sclass = q->sclass = REGISTER;
                        askregvar(p, r);
                        assert(p->x.regnode && p->x.regnode->vbl == p);
                        q->x = p->x;
                        q->type = p->type;
                }
                else if (askregvar(p, rmap(ttob(p->type)))
                         && r != NULL
                         && (isint(p->type) || p->type == q->type)) {
                        assert(q->sclass != REGISTER);
                        p->sclass = q->sclass = REGISTER;
                        q->type = p->type;
                }
        }
        assert(!caller[i]);
        offset = 0;
        gencode(caller, callee);
        if (ncalls)
                usedmask[IREG] |= ((unsigned)1)<<REG_RETADDR;
        usedmask[IREG] &= INT_CALLEE_SAVE;
        usedmask[FREG] &= 0xfff00000;
        maxargoffset = roundup(maxargoffset, usedmask[FREG] ? 8 : 2);
        if (ncalls && maxargoffset < NUM_ARG_REGS*2)
                maxargoffset = NUM_ARG_REGS*2;
        sizefsave = 4*bitcount(usedmask[FREG]);
        sizeisave = 2*bitcount(usedmask[IREG]);
        framesize = roundup(maxargoffset + sizefsave
                + sizeisave + maxoffset, 2);
        segment(CODE);
        printf("align 16\n");
        printf("%s:\n", f->x.name);
        i = maxargoffset + sizefsave - framesize;
        if (framesize > 0)
                print("addi sp,sp,%d\n", -framesize);
        saved = maxargoffset;
        for (i = 20; i <= 30; i += 2)
                if (usedmask[FREG]&(3<<i)) {
                        print("s.d rf%d,%d(sp)\n", i, saved);
                        saved += 8;
                }

        for (i = 0; i < NUM_IREGS; i++)
                if (usedmask[IREG]&(1<<i)) {
                        print("sw r%d,%d(sp)\n", i, saved);
                        saved += 2;
                }
        for (i = 0; i < NUM_ARG_REGS && callee[i]; i++) {
                r = argregs[i];
                if (r && r->x.regnode != callee[i]->x.regnode) {
                        Symbol out = callee[i];
                        Symbol in  = caller[i];
                        int rn = r->x.regnode->number;
                        int rs = r->x.regnode->set;
                        int tyin = ttob(in->type);

                        assert(out && in && r && r->x.regnode);
                        assert(out->sclass != REGISTER || out->x.regnode);
                        if (out->sclass == REGISTER
                        && (isint(out->type) || out->type == in->type)) {
                                int outn = out->x.regnode->number;
                                if (rs == FREG && tyin == F+sizeop(8))
                                        print("mov.d rf%d,rf%d\n", outn, rn);
                                else if (rs == FREG && tyin == F+sizeop(4))
                                        print("mov.s rf%d,rf%d\n", outn, rn);
                                else if (rs == IREG && tyin == F+sizeop(8))
                                        print("mtc1.d r%d,rf%d\n", rn,   outn);
                                else if (rs == IREG && tyin == F+sizeop(4))
                                        print("mtc1 r%d,rf%d\n",   rn,   outn);
                                else
                                        print("mov r%d,r%d\n",    outn, rn);
                        } else {
                                int off = in->x.offset + framesize;
                                if (rs == FREG && tyin == F+sizeop(8))
                                        print("s.d rf%d,%d(sp)\n", rn, off);
                                else if (rs == FREG && tyin == F+sizeop(4))
                                        print("s.s rf%d,%d(sp)\n", rn, off);
                                else {
                                        int i, n = (in->type->size + 1)/2;
                                        for (i = rn; i < rn+n && i <= REG_LAST_ARG; i++)
                                                print("sw r%d,%d(sp)\n", i, off + (i-rn)*2);
                                }
                        }
                }
        }
        if (varargs && callee[i-1]) {
                i = callee[i-1]->x.offset + callee[i-1]->type->size;
                for (i = roundup(i, 2)/2; i < NUM_ARG_REGS; i++)
                        print("sw r%d,%d(sp)\n", REG_FIRST_ARG + i, framesize + 2*i);
                }
        emitcode();
        saved = maxargoffset;
        for (i = 20; i <= 30; i += 2)
                if (usedmask[FREG]&(3<<i)) {
                        print("l.d rf%d,%d(sp)\n", i, saved);
                        saved += 8;
                }
        for (i = 0; i < NUM_IREGS; i++)
                if (usedmask[IREG]&(1<<i)) {
                        print("lw r%d,%d(sp)\n", i, saved);
                        saved += 2;
                }
        if (framesize > 0)
                print("addi sp,sp,%d\n", framesize);
        print("ret\n\n");
}
static void defconst(int suffix, int size, Value v) {
        if (suffix == F)
                fp();
        else if (suffix == P)
                print("word %u\n", v.p);
        else if (size == 1)
                print("byte %u\n", suffix == I ? v.i : v.u);
        else if (size == 2)
                print("word %u\n", suffix == I ? v.i : v.u);
        else if (size == 4)
                print("dword %u\n", suffix == I ? v.i : v.u);
}
static void defaddress(Symbol p) {
        print("word %s\n", p->x.name);
}
static void defstring(int n, char *str) {
        char *s;

        for (s = str; s < str + n; s++)
                print("byte %d\n", (*s)&0377);
}
static void export(Symbol p) {
        print("global %s\n", p->x.name);
}
static void import(Symbol p) {
        if (!isfunc(p->type))
                print("global %s\n", p->x.name); /* good enough? */
}
static void defsymbol(Symbol p) {
        if (p->scope >= LOCAL && p->sclass == STATIC)
                p->x.name = stringf("L%d", genlabel(1));
        else if (p->generated)
                p->x.name = stringf("L%s", p->name);
        else if (p->scope == GLOBAL || p->sclass == EXTERN)
                p->x.name = stringf("_%s", p->name);
        else
                assert(p->scope != CONSTANTS || isint(p->type) || isptr(p->type)),
                p->x.name = p->name;
}
static void address(Symbol q, Symbol p, long n) {
        if (p->scope == GLOBAL
        || p->sclass == STATIC || p->sclass == EXTERN)
                q->x.name = stringf("%s%s%D", p->x.name,
                        n >= 0 ? "+" : "", n);
        else {
                assert(n <= INT_MAX && n >= INT_MIN);
                q->x.offset = p->x.offset + n;
                q->x.name = stringd(q->x.offset);
        }
}
static void global(Symbol p) {
        if (p->type->align > 1)
                print("align %d\n", p->type->align);
        print("%s:\n", p->x.name);
        if (p->u.seg == BSS)
                printf("bss %d\n", p->type->size);
}
static void segment(int n) {
        cseg = n;
}
static void space(int n) {
        if (cseg != BSS)
                print("space %d\n", n);
}
static void blkloop(int dreg, int doff, int sreg, int soff, int size, int tmps[]) {
        int lab = genlabel(1);

        print("addi r%d,r%d,%d\n", sreg, sreg, size&~7);
        print("addi r%d,r%d,%d\n", tmps[2], dreg, size&~7);
        blkcopy(tmps[2], doff, sreg, soff, size&7, tmps);
        print("L%d:\n", lab);
        print("addi r%d,r%d,%d\n", sreg, sreg, -8);
        print("addi r%d,r%d,%d\n", tmps[2], tmps[2], -8);
        blkcopy(tmps[2], doff, sreg, soff, 8, tmps);
        print("cmp r%d,r%d\nbltu L%d\n", dreg, tmps[2], lab);
}
static void blkfetch(int size, int off, int reg, int tmp) {
        assert(size == 1 || size == 2);
        if (size == 1)
                print("lb r%d,%d(r%d)\n",  tmp, off, reg);
        else {
                assert(salign >= size);
                print("lw r%d,%d(r%d)\n",   tmp, off, reg);
        }
}
static void blkstore(int size, int off, int reg, int tmp) {
        assert(size == 1 || size == 2);
        if (size == 1)
                print("sb r%d,%d(r%d)\n",  tmp, off, reg);
        else {
                assert(dalign >= size);
                print("sw r%d,%d(r%d)\n",  tmp, off, reg);
        }
}
static void stabinit(char *, int, char *[]);
static void stabline(Coordinate *);
static void stabsym(Symbol);

static char *currentfile;

static int bitcount(unsigned mask) {
        unsigned i, n = 0;

        for (i = 1; i; i <<= 1)
                if (mask&i)
                        n++;
        return n;
}

/* stabinit - initialize stab output */
static void stabinit(char *file, int argc, char *argv[]) {
        if (file) {
                print("file \"%s\"\n", file);
                currentfile = file;
        }
}

/* stabline - emit stab entry for source coordinate *cp */
static void stabline(Coordinate *cp) {
        if (cp->file && cp->file != currentfile) {
                print("file \"%s\"\n", cp->file);
                currentfile = cp->file;
        }
        print("loc %d\n", cp->y);
}

/* stabsym - output a stab entry for symbol p */
static void stabsym(Symbol p) {
        if (p == cfunc && IR->stabline)
                (*IR->stabline)(&p->src);
}

static int fp() {
    static int err = 0;
    if (!err) {
        err = 1;
        error("floating point not implemented\n");
    }
    return 2;
}

Interface xr16IR = {
        1, 1, 0,  /* char */
        2, 2, 0,  /* short */
        2, 2, 0,  /* int */
        4, 4, 0,  /* long */
        4, 4, 0,  /* long long */
        4, 4, 1,  /* float */
        4, 4, 1,  /* double */
        4, 4, 1,  /* long double */
        2, 2, 0,  /* T * */
        0, 2, 0,  /* struct */
        0,  /* little_endian */
        1,  /* mulops_calls */
        0,  /* wants_callb */
        0,  /* wants_argb */
        1,  /* left_to_right */
        0,  /* wants_dag */
        1,  /* unsigned_char */
        address,
        blockbeg,
        blockend,
        defaddress,
        defconst,
        defstring,
        defsymbol,
        emit,
        export,
        function,
        gen,
        global,
        import,
        local,
        progbeg,
        progend,
        segment,
        space,
        0, 0, 0, stabinit, stabline, stabsym, 0,
        {
                2,      /* max_unaligned_load */
                rmap,
                blkfetch, blkstore, blkloop,
                _label,
                _rule,
                _nts,
                _kids,
                _string,
                _templates,
                _isinstruction,
                _ntname,
                emit2,
                doarg,
                target,
                clobber,

        }
};
static char rcsid[] =
	"$Header: /dist/lcc-xr16/src-mods/src/xr16.md 3     3/04/00 10:05a Jan $\n"
	"Portions copyright (C) 1999,2000, Gray Research LLC.  All rights reserved.\n"
	"This program is subject to the XSOC License Agreement.\n"
	"See the LICENSE file.";