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Eliminate dead slots in snapshots using bytecode data-flow analysis.

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This commit is contained in:
Mike Pall
2011-02-22 22:39:12 +01:00
parent 8d0b073ff0
commit 4c97cc7730
4 changed files with 133 additions and 21 deletions
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8
src/lj_record.c
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@@ -1364,11 +1364,8 @@ static void rec_comp_fixup(jit_State *J, const BCIns *pc, int cond)
/* Set PC to opposite target to avoid re-recording the comp. in side trace. */
J->cur.snapmap[snap->mapofs + snap->nent] = SNAP_MKPC(npc);
J->needsnap = 1;
/* Shrink last snapshot if possible. */
if (bc_a(jmpins) < J->maxslot) {
J->maxslot = bc_a(jmpins);
lj_snap_shrink(J);
}
if (bc_a(jmpins) < J->maxslot) J->maxslot = bc_a(jmpins);
lj_snap_shrink(J); /* Shrink last snapshot if possible. */
}
/* Record the next bytecode instruction (_before_ it's executed). */
@@ -1411,6 +1408,7 @@ void lj_record_ins(jit_State *J)
/* Need snapshot before recording next bytecode (e.g. after a store). */
if (J->needsnap) {
J->needsnap = 0;
lj_snap_purge(J);
lj_snap_add(J);
J->mergesnap = 1;
}