sam/libqbe
1
0
Fork 0
Code Issues Pull requests Projects Releases 1 Packages Wiki Activity Actions

move usage computation in filluse()

Browse source
This commit is contained in:
Quentin Carbonneaux 2015-11-11 21:21:54 -05:00
parent d3f1cd9483
commit a3a1fc0c80
4 changed files with 54 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

47
lisc/ssa.c
View file

@ -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)
{