DrSocalkwe3n/luajit
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Don't eliminate SLOAD restores across RETF.

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Move restore-elimination logic into snapshot_slots().
This commit is contained in:
Mike Pall
2010-02-23 03:08:49 +01:00
parent f751cd1d6f
commit c1362dcac9
3 changed files with 13 additions and 6 deletions
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14
src/lj_snap.c
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@@ -53,16 +53,24 @@ void lj_snap_grow_map_(jit_State *J, MSize need)
/* Add all modified slots to the snapshot. */
static MSize snapshot_slots(jit_State *J, SnapEntry *map, BCReg nslots)
{
IRRef retf = J->chain[IR_RETF]; /* Limits SLOAD restore elimination. */
BCReg s;
MSize n = 0;
for (s = 0; s < nslots; s++) {
TRef tr = J->slot[s];
IRRef ref = tref_ref(tr);
if (ref) {
SnapEntry sn = SNAP_TR(s, tr);
IRIns *ir = IR(ref);
if (!(ir->o == IR_SLOAD && ir->op1 == s &&
!(ir->op2 & IRSLOAD_INHERIT)))
map[n++] = SNAP_TR(s, tr);
if (ir->o == IR_SLOAD && ir->op1 == s && ref > retf) {
/* No need to snapshot unmodified non-inherited slots. */
if (!(ir->op2 & IRSLOAD_INHERIT))
continue;
/* No need to restore readonly slots and unmodified non-parent slots. */
if ((ir->op2 & (IRSLOAD_READONLY|IRSLOAD_PARENT)) != IRSLOAD_PARENT)
sn |= SNAP_NORESTORE;
}
map[n++] = sn;
}
}
return n;