ssa.c


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#include "common.h"
#include "ir.h"

void
filluses(struct function *fn)
{
   extern int ninstr;
   struct block *blk = fn->entry;

   for (int i = 0; i < ninstr; ++i)
      deluses(i);

   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)
            adduse(blk, ins, phi[i]);
      }
      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);
         adduse(blk, ins, instrtab[ins].l);
         adduse(blk, ins, instrtab[ins].r);
      }
      adduse(blk, USERJUMP, blk->jmp.arg[0]);
      adduse(blk, USERJUMP, blk->jmp.arg[1]);
   } while ((blk = blk->lnext) != fn->entry);
}

/* vim:set ts=3 sw=3 expandtab: */