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FFI: Optimize snapshots for cdata comparisons.

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This commit is contained in:
Mike Pall
2011-02-05 18:54:08 +01:00
parent da3f256a52
commit bf05209e14
4 changed files with 23 additions and 8 deletions
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14
src/lj_record.c
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@@ -1355,10 +1355,10 @@ static void rec_comp_prep(jit_State *J)
}
/* Fixup comparison. */
static void rec_comp_fixup(jit_State *J, int cond)
static void rec_comp_fixup(jit_State *J, const BCIns *pc, int cond)
{
BCIns jmpins = J->pc[1];
const BCIns *npc = J->pc + 2 + (cond ? bc_j(jmpins) : 0);
BCIns jmpins = pc[1];
const BCIns *npc = pc + 2 + (cond ? bc_j(jmpins) : 0);
SnapShot *snap = &J->cur.snap[J->cur.nsnap-1];
/* Set PC to opposite target to avoid re-recording the comp. in side trace. */
J->cur.snapmap[snap->mapofs + snap->nent] = SNAP_MKPC(npc);
@@ -1383,6 +1383,10 @@ void lj_record_ins(jit_State *J)
/* Perform post-processing action before recording the next instruction. */
if (LJ_UNLIKELY(J->postproc != LJ_POST_NONE)) {
switch (J->postproc) {
case LJ_POST_FIXCOMP: /* Fixup comparison. */
pc = frame_pc(&J2G(J)->tmptv);
rec_comp_fixup(J, pc, (!tvistruecond(&J2G(J)->tmptv2) ^ (bc_op(*pc)&1)));
/* fallthrough */
case LJ_POST_FIXGUARD: /* Fixup and emit pending guard. */
if (!tvistruecond(&J2G(J)->tmptv2)) {
BCReg s;
@@ -1505,7 +1509,7 @@ void lj_record_ins(jit_State *J)
break;
}
emitir(IRTG(irop, ta), ra, rc);
rec_comp_fixup(J, ((int)op ^ irop) & 1);
rec_comp_fixup(J, J->pc, ((int)op ^ irop) & 1);
}
break;
@@ -1529,7 +1533,7 @@ void lj_record_ins(jit_State *J)
rec_mm_equal(J, &ix, (int)op);
break;
}
rec_comp_fixup(J, ((int)op & 1) == !diff);
rec_comp_fixup(J, J->pc, ((int)op & 1) == !diff);
}
break;