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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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6
src/Makefile.dep
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@ -75,9 +75,9 @@ lj_cparse.o: lj_cparse.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_gc.h lj_err.h lj_errmsg.h lj_str.h lj_ctype.h lj_cparse.h lj_frame.h \
lj_bc.h lj_vm.h lj_char.h
lj_crecord.o: lj_crecord.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_err.h lj_errmsg.h lj_str.h lj_tab.h lj_ctype.h lj_gc.h lj_cparse.h \
lj_cconv.h lj_clib.h lj_ir.h lj_jit.h lj_iropt.h lj_trace.h \
lj_dispatch.h lj_bc.h lj_traceerr.h lj_ffrecord.h lj_crecord.h
lj_err.h lj_errmsg.h lj_str.h lj_tab.h lj_frame.h lj_bc.h lj_ctype.h \
lj_gc.h lj_cparse.h lj_cconv.h lj_clib.h lj_ir.h lj_jit.h lj_iropt.h \
lj_trace.h lj_dispatch.h lj_traceerr.h lj_ffrecord.h lj_crecord.h
lj_ctype.o: lj_ctype.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \
lj_gc.h lj_err.h lj_errmsg.h lj_str.h lj_tab.h lj_ctype.h
lj_dispatch.o: lj_dispatch.c lj_obj.h lua.h luaconf.h lj_def.h lj_arch.h \

10
src/lj_crecord.c
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@ -13,6 +13,7 @@
#include "lj_err.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_frame.h"
#include "lj_ctype.h"
#include "lj_cparse.h"
#include "lj_cconv.h"
@ -835,6 +836,15 @@ void LJ_FASTCALL recff_cdata_arith(jit_State *J, RecordFFData *rd)
err_type:
lj_trace_err(J, LJ_TRERR_BADTYPE);
}
/* Fixup cdata comparisons, too. Avoids some cdata escapes. */
if (J->postproc == LJ_POST_FIXGUARD && frame_iscont(J->L->base-1)) {
const BCIns *pc = frame_contpc(J->L->base-1) - 1;
if (bc_op(*pc) <= BC_ISNEP) {
setframe_pc(&J2G(J)->tmptv, pc);
J2G(J)->tmptv.u32.lo = ((tref_istrue(tr) ^ bc_op(*pc)) & 1);
J->postproc = LJ_POST_FIXCOMP;
}
}
J->base[0] = tr;
}
}

1
src/lj_jit.h
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@ -111,6 +111,7 @@ typedef enum {
/* Post-processing action. */
typedef enum {
LJ_POST_NONE, /* No action. */
LJ_POST_FIXCOMP, /* Fixup comparison and emit pending guard. */
LJ_POST_FIXGUARD /* Fixup and emit pending guard. */
} PostProc;

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;