diff options
Diffstat (limited to 'lisc/ssa.c')
| -rw-r--r-- | lisc/ssa.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lisc/ssa.c b/lisc/ssa.c index 521aa38..d628f15 100644 --- a/lisc/ssa.c +++ b/lisc/ssa.c @@ -1,5 +1,52 @@ #include "lisc.h" +/* fill usage and phi information + */ +void +filluse(Fn *fn) +{ + Blk *b; + Phi *p; + Ins *i; + int t; + uint a; + Tmp *tmp; + + /* todo, is this the correct file? */ + tmp = fn->tmp; + for (t=0; t<fn->ntmp; t++) { + tmp[t].ndef = 0; + tmp[t].nuse = 0; + tmp[t].phi = 0; + } + for (b=fn->start; b; b=b->link) { + for (p=b->phi; p; p=p->link) { + assert(rtype(p->to) == RTmp); + tmp[p->to.val].ndef++; + tmp[p->to.val].phi = p->to.val; + for (a=0; a<p->narg; a++) + if (rtype(p->arg[a]) == RTmp) { + t = p->arg[a].val; + tmp[t].nuse++; + if (!tmp[t].phi) + tmp[t].phi = p->to.val; + } + } + for (i=b->ins; i!=&b->ins[b->nins]; i++) { + if (!req(i->to, R)) { + assert(rtype(i->to) == RTmp); + tmp[i->to.val].ndef++; + } + if (rtype(i->arg[0]) == RTmp) + tmp[i->arg[0].val].nuse++; + if (rtype(i->arg[1]) == RTmp) + tmp[i->arg[1].val].nuse++; + } + if (rtype(b->jmp.arg) == RTmp) + tmp[b->jmp.arg.val].nuse++; + } +} + static void addpred(Blk *bp, Blk *bc) { |