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Drop range limit for sunk stores relative to sunk allocation.

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This commit is contained in:
Mike Pall
2012-07-04 21:16:06 +02:00
parent bd782cedd5
commit 7c056488d9
4 changed files with 50 additions and 12 deletions
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21
src/lj_asm.c
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@@ -778,6 +778,23 @@ static int asm_snap_canremat(ASMState *as)
return 0;
}
/* Check whether a sunk store corresponds to an allocation. */
static int asm_sunk_store(ASMState *as, IRIns *ira, IRIns *irs)
{
if (irs->s == 255) {
if (irs->o == IR_ASTORE || irs->o == IR_HSTORE ||
irs->o == IR_FSTORE || irs->o == IR_XSTORE) {
IRIns *irk = IR(irs->op1);
if (irk->o == IR_AREF || irk->o == IR_HREFK)
irk = IR(irk->op1);
return (IR(irk->op1) == ira);
}
return 0;
} else {
return (ira + irs->s == irs); /* Quick check. */
}
}
/* Allocate register or spill slot for a ref that escapes to a snapshot. */
static void asm_snap_alloc1(ASMState *as, IRRef ref)
{
@@ -795,8 +812,8 @@ static void asm_snap_alloc1(ASMState *as, IRRef ref)
else { /* Allocate stored values for TNEW, TDUP and CNEW. */
IRIns *irs;
lua_assert(ir->o == IR_TNEW || ir->o == IR_TDUP || ir->o == IR_CNEW);
for (irs = IR(as->curins); irs > ir; irs--)
if (irs->r == RID_SINK && ir + irs->s == irs) {
for (irs = IR(as->snapref-1); irs > ir; irs--)
if (irs->r == RID_SINK && asm_sunk_store(as, ir, irs)) {
lua_assert(irs->o == IR_ASTORE || irs->o == IR_HSTORE ||
irs->o == IR_FSTORE || irs->o == IR_XSTORE);
asm_snap_alloc1(as, irs->op2);