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Add HREFK forwarding. Eliminate HREFK guard for TDUP refs.

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This commit is contained in:
Mike Pall 2012-06-28 15:10:52 +02:00
parent 0d1056eeed
commit a9bf455b96
3 changed files with 30 additions and 0 deletions
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1
src/lj_iropt.h
View File

@ -120,6 +120,7 @@ LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_uload(jit_State *J);
LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_fload(jit_State *J);
LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_xload(jit_State *J);
LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_tab_len(jit_State *J);
LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_hrefk(jit_State *J);
LJ_FUNC int LJ_FASTCALL lj_opt_fwd_href_nokey(jit_State *J);
LJ_FUNC int LJ_FASTCALL lj_opt_fwd_tptr(jit_State *J, IRRef lim);
LJ_FUNC int lj_opt_fwd_wasnonnil(jit_State *J, IROpT loadop, IRRef xref);

3
src/lj_opt_fold.c
View File

@ -1846,6 +1846,9 @@ LJFOLDF(cse_uref)
return EMITFOLD;
}
LJFOLD(HREFK any any)
LJFOLDX(lj_opt_fwd_hrefk)
LJFOLD(HREF TNEW any)
LJFOLDF(fwd_href_tnew)
{

26
src/lj_opt_mem.c
View File

@ -21,6 +21,7 @@
/* Some local macros to save typing. Undef'd at the end. */
#define IR(ref) (&J->cur.ir[(ref)])
#define fins (&J->fold.ins)
#define fleft (&J->fold.left)
#define fright (&J->fold.right)
/*
@ -255,6 +256,30 @@ TRef LJ_FASTCALL lj_opt_fwd_hload(jit_State *J)
return EMITFOLD;
}
/* HREFK forwarding. */
TRef LJ_FASTCALL lj_opt_fwd_hrefk(jit_State *J)
{
IRRef tab = fleft->op1;
IRRef ref = J->chain[IR_NEWREF];
while (ref > tab) {
IRIns *newref = IR(ref);
if (tab == newref->op1) {
if (fright->op1 == newref->op2)
return ref; /* Forward from NEWREF. */
else
goto docse;
} else if (aa_table(J, tab, newref->op1) != ALIAS_NO) {
goto docse;
}
ref = newref->prev;
}
/* No conflicting NEWREF: key location unchanged for HREFK of TDUP. */
if (IR(tab)->o == IR_TDUP)
fins->t.irt &= ~IRT_GUARD; /* Drop HREFK guard. */
docse:
return CSEFOLD;
}
/* Check whether HREF of TNEW/TDUP can be folded to niltv. */
int LJ_FASTCALL lj_opt_fwd_href_nokey(jit_State *J)
{
@ -872,6 +897,7 @@ int lj_opt_fwd_wasnonnil(jit_State *J, IROpT loadop, IRRef xref)
#undef IR
#undef fins
#undef fleft
#undef fright
#endif