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FOLD (base+(idx+k)*sz)+ofs ==> (base+idx*sz)+(ofs+k*sz).

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This commit is contained in:
Mike Pall 2010-12-08 03:33:48 +01:00
parent 3c78a7f468
commit 6a04591b7b
1 changed files with 15 additions and 3 deletions
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18
src/lj_crecord.c
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@ -331,9 +331,21 @@ void LJ_FASTCALL recff_cdata_index(jit_State *J, RecordFFData *rd)
idx = emitir(IRT(IR_TOINT, IRT_INTP), idx, IRTOINT_ANY);
#endif
if (ctype_ispointer(ct->info)) {
sid = ctype_cid(ct->info);
idx = emitir(IRT(IR_MUL, IRT_INTP), idx,
lj_ir_kintp(J, lj_ctype_size(cts, sid)));
ptrdiff_t sz = (ptrdiff_t)lj_ctype_size(cts, (sid = ctype_cid(ct->info)));
IRIns *ir = IR(tref_ref(idx));
if (LJ_LIKELY(J->flags & JIT_F_OPT_FOLD) &&
ir->o == IR_ADD && irref_isk(ir->op2)) {
/* This would be rather difficult in FOLD, so do it here:
** (base+(idx+k)*sz)+ofs ==> (base+idx*sz)+(ofs+k*sz)
*/
idx = ir->op1;
#if LJ_64
ofs += (int64_t)ir_kint64(IR(ir->op2))->u64 * sz;
#else
ofs += IR(ir->op2)->i * sz;
#endif
}
idx = emitir(IRT(IR_MUL, IRT_INTP), idx, lj_ir_kintp(J, sz));
ptr = emitir(IRT(IR_ADD, IRT_PTR), idx, ptr);
}
} else if (tref_isstr(idx)) {