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#include "ir.h"
#include <stdint.h>
struct uses *
ssauses(struct function *fn)
{
extern int ninstr;
struct uses *uses = xcalloc(ninstr * sizeof *uses);
vec_of(struct use) *vuse = xcalloc(ninstr * sizeof *vuse), useacc = {0};
struct block *blk = fn->entry;
#define USE(r, isjmp, x) do { \
struct use u0, u = {isjmp, {x}}; \
if ((r).t == RTMP) { \
if (vuse[(r).i].n == 0){ \
memcpy(&vuse[(r).i].p, &u, sizeof u); \
++vuse[(r).i].n; \
} else { \
if (vuse[(r).i].n == 1) { \
memcpy(&u0, &vuse[(r).i].p, sizeof u0); \
vuse[(r).i].n = 0; \
vuse[(r).i].p = 0; \
vpush(&vuse[(r).i], u0); \
} \
vpush(&vuse[(r).i], u); \
} \
} \
} while (0)
do {
for (int i = 0; i < blk->phi.n; ++i) {
int ins = blk->phi.p[i];
union ref *phi = phitab.p[instrtab[ins].l.i];
for (int i = 0; i < blk->npred; ++i) {
USE(phi[i], 0, ins);
}
}
for (int i = 0; i < blk->ins.n; ++i) {
int ins = blk->ins.p[i];
assert(instrtab[ins].l.t != RMORE);
if (instrtab[ins].op != Ocall) assert(instrtab[ins].l.t != RMORE);
USE(instrtab[ins].l, 0, ins);
USE(instrtab[ins].r, 0, ins);
}
USE(blk->jmp.arg[0], 1, blk->id);
USE(blk->jmp.arg[1], 1, blk->id);
} while ((blk = blk->lnext) != fn->entry);
for (int i = 0; i < ninstr; ++i) {
int nuse = uses[i].nuse = vuse[i].n;
if (!nuse) continue;
if (nuse == 1) {
uses[i].use = uses[i]._use0;
memcpy(uses[i].use, &vuse[i].p, sizeof *uses[i].use);
} else if (nuse < arraylength(uses[i]._use0)) {
uses[i].use = uses[i]._use0;
memcpy(uses[i].use, vuse[i].p, nuse * sizeof(struct use));
vfree(&vuse[i]);
} else {
intptr_t o;
o = useacc.n;
memcpy(&uses[i].use, &o, sizeof o);
vpushn(&useacc, vuse[i].p, nuse);
vfree(&vuse[i]);
}
}
for (int i = 0; i < ninstr; ++i) {
if (uses[i].use != uses[i]._use0) {
intptr_t o;
memcpy(&o, &uses[i].use, sizeof o);
uses[i].use = useacc.p + o;
}
}
free(vuse);
return uses;
}
void
freeuses(struct uses *u, int n)
{
for (int i = 0; i < n; ++i) {
if (u[i].use != u[i]._use0) {
free(u[i].use);
break;
}
}
free(u);
}
/* vim:set ts=3 sw=3 expandtab: */
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