3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
24 #include "X86.h"
34 #define DEBUG_TYPE "x86-fixup-inst-tuning"
45   StringRef getPassName() const override { return "X86 Fixup Inst Tuning"; }  in getPassName()
64 char X86FixupInstTuningPass::ID = 0;
172   // `vunpcklpd/vmovlhps r, r` -> `vunpcklqdq r, r`/`vshufpd r, r, 0x00`  in processInstruction()
173   // `vunpckhpd/vmovlhps r, r` -> `vunpckhqdq r, r`/`vshufpd r, r, 0xff`  in processInstruction()
174   // `vunpcklpd r, r, k` -> `vunpcklqdq r, r, k`/`vshufpd r, r, k, 0x00`  in processInstruction()
175   // `vunpckhpd r, r, k` -> `vunpckhqdq r, r, k`/`vshufpd r, r, k, 0xff`  in processInstruction()
210     return ProcessUNPCK(NewOpc, 0x00);  in processInstruction()
216     return ProcessUNPCK(NewOpc, 0xff);  in processInstruction()
228   case X86::VPERMILPDri:  in processInstruction()
229     return ProcessVPERMILPDri(X86::VSHUFPDrri);  in processInstruction()
230   case X86::VPERMILPDYri:  in processInstruction()
231     return ProcessVPERMILPDri(X86::VSHUFPDYrri);  in processInstruction()
232   case X86::VPERMILPDZ128ri:  in processInstruction()
233     return ProcessVPERMILPDri(X86::VSHUFPDZ128rri);  in processInstruction()
234   case X86::VPERMILPDZ256ri:  in processInstruction()
235     return ProcessVPERMILPDri(X86::VSHUFPDZ256rri);  in processInstruction()
236   case X86::VPERMILPDZri:  in processInstruction()
237     return ProcessVPERMILPDri(X86::VSHUFPDZrri);  in processInstruction()
238   case X86::VPERMILPDZ128rikz:  in processInstruction()
239     return ProcessVPERMILPDri(X86::VSHUFPDZ128rrikz);  in processInstruction()
240   case X86::VPERMILPDZ256rikz:  in processInstruction()
241     return ProcessVPERMILPDri(X86::VSHUFPDZ256rrikz);  in processInstruction()
242   case X86::VPERMILPDZrikz:  in processInstruction()
243     return ProcessVPERMILPDri(X86::VSHUFPDZrrikz);  in processInstruction()
244   case X86::VPERMILPDZ128rik:  in processInstruction()
245     return ProcessVPERMILPDri(X86::VSHUFPDZ128rrik);  in processInstruction()
246   case X86::VPERMILPDZ256rik:  in processInstruction()
247     return ProcessVPERMILPDri(X86::VSHUFPDZ256rrik);  in processInstruction()
248   case X86::VPERMILPDZrik:  in processInstruction()
249     return ProcessVPERMILPDri(X86::VSHUFPDZrrik);  in processInstruction()
251   case X86::VPERMILPSri:  in processInstruction()
252     return ProcessVPERMILPSri(X86::VSHUFPSrri);  in processInstruction()
253   case X86::VPERMILPSYri:  in processInstruction()
254     return ProcessVPERMILPSri(X86::VSHUFPSYrri);  in processInstruction()
255   case X86::VPERMILPSZ128ri:  in processInstruction()
256     return ProcessVPERMILPSri(X86::VSHUFPSZ128rri);  in processInstruction()
257   case X86::VPERMILPSZ256ri:  in processInstruction()
258     return ProcessVPERMILPSri(X86::VSHUFPSZ256rri);  in processInstruction()
259   case X86::VPERMILPSZri:  in processInstruction()
260     return ProcessVPERMILPSri(X86::VSHUFPSZrri);  in processInstruction()
261   case X86::VPERMILPSZ128rikz:  in processInstruction()
262     return ProcessVPERMILPSri(X86::VSHUFPSZ128rrikz);  in processInstruction()
263   case X86::VPERMILPSZ256rikz:  in processInstruction()
264     return ProcessVPERMILPSri(X86::VSHUFPSZ256rrikz);  in processInstruction()
265   case X86::VPERMILPSZrikz:  in processInstruction()
266     return ProcessVPERMILPSri(X86::VSHUFPSZrrikz);  in processInstruction()
267   case X86::VPERMILPSZ128rik:  in processInstruction()
268     return ProcessVPERMILPSri(X86::VSHUFPSZ128rrik);  in processInstruction()
269   case X86::VPERMILPSZ256rik:  in processInstruction()
270     return ProcessVPERMILPSri(X86::VSHUFPSZ256rrik);  in processInstruction()
271   case X86::VPERMILPSZrik:  in processInstruction()
272     return ProcessVPERMILPSri(X86::VSHUFPSZrrik);  in processInstruction()
273   case X86::VPERMILPSmi:  in processInstruction()
274     return ProcessVPERMILPSmi(X86::VPSHUFDmi);  in processInstruction()
275   case X86::VPERMILPSYmi:  in processInstruction()
278     return ST->hasAVX2() ? ProcessVPERMILPSmi(X86::VPSHUFDYmi) : false;  in processInstruction()
279   case X86::VPERMILPSZ128mi:  in processInstruction()
280     return ProcessVPERMILPSmi(X86::VPSHUFDZ128mi);  in processInstruction()
281   case X86::VPERMILPSZ256mi:  in processInstruction()
282     return ProcessVPERMILPSmi(X86::VPSHUFDZ256mi);  in processInstruction()
283   case X86::VPERMILPSZmi:  in processInstruction()
284     return ProcessVPERMILPSmi(X86::VPSHUFDZmi);  in processInstruction()
285   case X86::VPERMILPSZ128mikz:  in processInstruction()
286     return ProcessVPERMILPSmi(X86::VPSHUFDZ128mikz);  in processInstruction()
287   case X86::VPERMILPSZ256mikz:  in processInstruction()
288     return ProcessVPERMILPSmi(X86::VPSHUFDZ256mikz);  in processInstruction()
289   case X86::VPERMILPSZmikz:  in processInstruction()
290     return ProcessVPERMILPSmi(X86::VPSHUFDZmikz);  in processInstruction()
291   case X86::VPERMILPSZ128mik:  in processInstruction()
292     return ProcessVPERMILPSmi(X86::VPSHUFDZ128mik);  in processInstruction()
293   case X86::VPERMILPSZ256mik:  in processInstruction()
294     return ProcessVPERMILPSmi(X86::VPSHUFDZ256mik);  in processInstruction()
295   case X86::VPERMILPSZmik:  in processInstruction()
296     return ProcessVPERMILPSmi(X86::VPSHUFDZmik);  in processInstruction()
298   case X86::MOVLHPSrr:  in processInstruction()
299   case X86::UNPCKLPDrr:  in processInstruction()
300     return ProcessUNPCKLPDrr(X86::PUNPCKLQDQrr, X86::SHUFPDrri);  in processInstruction()
301   case X86::VMOVLHPSrr:  in processInstruction()
302   case X86::VUNPCKLPDrr:  in processInstruction()
303     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQrr, X86::VSHUFPDrri);  in processInstruction()
304   case X86::VUNPCKLPDYrr:  in processInstruction()
305     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQYrr, X86::VSHUFPDYrri);  in processInstruction()
307   case X86::VMOVLHPSZrr:  in processInstruction()
308   case X86::VUNPCKLPDZ128rr:  in processInstruction()
309     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ128rr, X86::VSHUFPDZ128rri);  in processInstruction()
310   case X86::VUNPCKLPDZ256rr:  in processInstruction()
311     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ256rr, X86::VSHUFPDZ256rri);  in processInstruction()
312   case X86::VUNPCKLPDZrr:  in processInstruction()
313     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZrr, X86::VSHUFPDZrri);  in processInstruction()
314   case X86::VUNPCKLPDZ128rrk:  in processInstruction()
315     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ128rrk, X86::VSHUFPDZ128rrik);  in processInstruction()
316   case X86::VUNPCKLPDZ256rrk:  in processInstruction()
317     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ256rrk, X86::VSHUFPDZ256rrik);  in processInstruction()
318   case X86::VUNPCKLPDZrrk:  in processInstruction()
319     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZrrk, X86::VSHUFPDZrrik);  in processInstruction()
320   case X86::VUNPCKLPDZ128rrkz:  in processInstruction()
321     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ128rrkz, X86::VSHUFPDZ128rrikz);  in processInstruction()
322   case X86::VUNPCKLPDZ256rrkz:  in processInstruction()
323     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZ256rrkz, X86::VSHUFPDZ256rrikz);  in processInstruction()
324   case X86::VUNPCKLPDZrrkz:  in processInstruction()
325     return ProcessUNPCKLPDrr(X86::VPUNPCKLQDQZrrkz, X86::VSHUFPDZrrikz);  in processInstruction()
326   case X86::UNPCKHPDrr:  in processInstruction()
327     return ProcessUNPCKHPDrr(X86::PUNPCKHQDQrr, X86::SHUFPDrri);  in processInstruction()
328   case X86::VUNPCKHPDrr:  in processInstruction()
329     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQrr, X86::VSHUFPDrri);  in processInstruction()
330   case X86::VUNPCKHPDYrr:  in processInstruction()
331     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQYrr, X86::VSHUFPDYrri);  in processInstruction()
332   case X86::VUNPCKHPDZ128rr:  in processInstruction()
333     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ128rr, X86::VSHUFPDZ128rri);  in processInstruction()
334   case X86::VUNPCKHPDZ256rr:  in processInstruction()
335     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ256rr, X86::VSHUFPDZ256rri);  in processInstruction()
336   case X86::VUNPCKHPDZrr:  in processInstruction()
337     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZrr, X86::VSHUFPDZrri);  in processInstruction()
338   case X86::VUNPCKHPDZ128rrk:  in processInstruction()
339     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ128rrk, X86::VSHUFPDZ128rrik);  in processInstruction()
340   case X86::VUNPCKHPDZ256rrk:  in processInstruction()
341     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ256rrk, X86::VSHUFPDZ256rrik);  in processInstruction()
342   case X86::VUNPCKHPDZrrk:  in processInstruction()
343     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZrrk, X86::VSHUFPDZrrik);  in processInstruction()
344   case X86::VUNPCKHPDZ128rrkz:  in processInstruction()
345     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ128rrkz, X86::VSHUFPDZ128rrikz);  in processInstruction()
346   case X86::VUNPCKHPDZ256rrkz:  in processInstruction()
347     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZ256rrkz, X86::VSHUFPDZ256rrikz);  in processInstruction()
348   case X86::VUNPCKHPDZrrkz:  in processInstruction()
349     return ProcessUNPCKHPDrr(X86::VPUNPCKHQDQZrrkz, X86::VSHUFPDZrrikz);  in processInstruction()
350   case X86::UNPCKLPDrm:  in processInstruction()
351     return ProcessUNPCKPDrm(X86::PUNPCKLQDQrm);  in processInstruction()
352   case X86::VUNPCKLPDrm:  in processInstruction()
353     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQrm);  in processInstruction()
354   case X86::VUNPCKLPDYrm:  in processInstruction()
355     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQYrm);  in processInstruction()
356   case X86::VUNPCKLPDZ128rm:  in processInstruction()
357     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ128rm);  in processInstruction()
358   case X86::VUNPCKLPDZ256rm:  in processInstruction()
359     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ256rm);  in processInstruction()
360   case X86::VUNPCKLPDZrm:  in processInstruction()
361     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZrm);  in processInstruction()
362   case X86::VUNPCKLPDZ128rmk:  in processInstruction()
363     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ128rmk);  in processInstruction()
364   case X86::VUNPCKLPDZ256rmk:  in processInstruction()
365     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ256rmk);  in processInstruction()
366   case X86::VUNPCKLPDZrmk:  in processInstruction()
367     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZrmk);  in processInstruction()
368   case X86::VUNPCKLPDZ128rmkz:  in processInstruction()
369     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ128rmkz);  in processInstruction()
370   case X86::VUNPCKLPDZ256rmkz:  in processInstruction()
371     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZ256rmkz);  in processInstruction()
372   case X86::VUNPCKLPDZrmkz:  in processInstruction()
373     return ProcessUNPCKPDrm(X86::VPUNPCKLQDQZrmkz);  in processInstruction()
374   case X86::UNPCKHPDrm:  in processInstruction()
375     return ProcessUNPCKPDrm(X86::PUNPCKHQDQrm);  in processInstruction()
376   case X86::VUNPCKHPDrm:  in processInstruction()
377     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQrm);  in processInstruction()
378   case X86::VUNPCKHPDYrm:  in processInstruction()
379     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQYrm);  in processInstruction()
380   case X86::VUNPCKHPDZ128rm:  in processInstruction()
381     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ128rm);  in processInstruction()
382   case X86::VUNPCKHPDZ256rm:  in processInstruction()
383     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ256rm);  in processInstruction()
384   case X86::VUNPCKHPDZrm:  in processInstruction()
385     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZrm);  in processInstruction()
386   case X86::VUNPCKHPDZ128rmk:  in processInstruction()
387     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ128rmk);  in processInstruction()
388   case X86::VUNPCKHPDZ256rmk:  in processInstruction()
389     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ256rmk);  in processInstruction()
390   case X86::VUNPCKHPDZrmk:  in processInstruction()
391     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZrmk);  in processInstruction()
392   case X86::VUNPCKHPDZ128rmkz:  in processInstruction()
393     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ128rmkz);  in processInstruction()
394   case X86::VUNPCKHPDZ256rmkz:  in processInstruction()
395     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZ256rmkz);  in processInstruction()
396   case X86::VUNPCKHPDZrmkz:  in processInstruction()
397     return ProcessUNPCKPDrm(X86::VPUNPCKHQDQZrmkz);  in processInstruction()
399   case X86::UNPCKLPSrr:  in processInstruction()
400     return ProcessUNPCKPS(X86::PUNPCKLDQrr);  in processInstruction()
401   case X86::VUNPCKLPSrr:  in processInstruction()
402     return ProcessUNPCKPS(X86::VPUNPCKLDQrr);  in processInstruction()
403   case X86::VUNPCKLPSYrr:  in processInstruction()
404     return ProcessUNPCKPS(X86::VPUNPCKLDQYrr);  in processInstruction()
405   case X86::VUNPCKLPSZ128rr:  in processInstruction()
406     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rr);  in processInstruction()
407   case X86::VUNPCKLPSZ256rr:  in processInstruction()
408     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rr);  in processInstruction()
409   case X86::VUNPCKLPSZrr:  in processInstruction()
410     return ProcessUNPCKPS(X86::VPUNPCKLDQZrr);  in processInstruction()
411   case X86::VUNPCKLPSZ128rrk:  in processInstruction()
412     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rrk);  in processInstruction()
413   case X86::VUNPCKLPSZ256rrk:  in processInstruction()
414     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rrk);  in processInstruction()
415   case X86::VUNPCKLPSZrrk:  in processInstruction()
416     return ProcessUNPCKPS(X86::VPUNPCKLDQZrrk);  in processInstruction()
417   case X86::VUNPCKLPSZ128rrkz:  in processInstruction()
418     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rrkz);  in processInstruction()
419   case X86::VUNPCKLPSZ256rrkz:  in processInstruction()
420     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rrkz);  in processInstruction()
421   case X86::VUNPCKLPSZrrkz:  in processInstruction()
422     return ProcessUNPCKPS(X86::VPUNPCKLDQZrrkz);  in processInstruction()
423   case X86::UNPCKHPSrr:  in processInstruction()
424     return ProcessUNPCKPS(X86::PUNPCKHDQrr);  in processInstruction()
425   case X86::VUNPCKHPSrr:  in processInstruction()
426     return ProcessUNPCKPS(X86::VPUNPCKHDQrr);  in processInstruction()
427   case X86::VUNPCKHPSYrr:  in processInstruction()
428     return ProcessUNPCKPS(X86::VPUNPCKHDQYrr);  in processInstruction()
429   case X86::VUNPCKHPSZ128rr:  in processInstruction()
430     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rr);  in processInstruction()
431   case X86::VUNPCKHPSZ256rr:  in processInstruction()
432     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rr);  in processInstruction()
433   case X86::VUNPCKHPSZrr:  in processInstruction()
434     return ProcessUNPCKPS(X86::VPUNPCKHDQZrr);  in processInstruction()
435   case X86::VUNPCKHPSZ128rrk:  in processInstruction()
436     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rrk);  in processInstruction()
437   case X86::VUNPCKHPSZ256rrk:  in processInstruction()
438     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rrk);  in processInstruction()
439   case X86::VUNPCKHPSZrrk:  in processInstruction()
440     return ProcessUNPCKPS(X86::VPUNPCKHDQZrrk);  in processInstruction()
441   case X86::VUNPCKHPSZ128rrkz:  in processInstruction()
442     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rrkz);  in processInstruction()
443   case X86::VUNPCKHPSZ256rrkz:  in processInstruction()
444     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rrkz);  in processInstruction()
445   case X86::VUNPCKHPSZrrkz:  in processInstruction()
446     return ProcessUNPCKPS(X86::VPUNPCKHDQZrrkz);  in processInstruction()
447   case X86::UNPCKLPSrm:  in processInstruction()
448     return ProcessUNPCKPS(X86::PUNPCKLDQrm);  in processInstruction()
449   case X86::VUNPCKLPSrm:  in processInstruction()
450     return ProcessUNPCKPS(X86::VPUNPCKLDQrm);  in processInstruction()
451   case X86::VUNPCKLPSYrm:  in processInstruction()
452     return ProcessUNPCKPS(X86::VPUNPCKLDQYrm);  in processInstruction()
453   case X86::VUNPCKLPSZ128rm:  in processInstruction()
454     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rm);  in processInstruction()
455   case X86::VUNPCKLPSZ256rm:  in processInstruction()
456     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rm);  in processInstruction()
457   case X86::VUNPCKLPSZrm:  in processInstruction()
458     return ProcessUNPCKPS(X86::VPUNPCKLDQZrm);  in processInstruction()
459   case X86::VUNPCKLPSZ128rmk:  in processInstruction()
460     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rmk);  in processInstruction()
461   case X86::VUNPCKLPSZ256rmk:  in processInstruction()
462     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rmk);  in processInstruction()
463   case X86::VUNPCKLPSZrmk:  in processInstruction()
464     return ProcessUNPCKPS(X86::VPUNPCKLDQZrmk);  in processInstruction()
465   case X86::VUNPCKLPSZ128rmkz:  in processInstruction()
466     return ProcessUNPCKPS(X86::VPUNPCKLDQZ128rmkz);  in processInstruction()
467   case X86::VUNPCKLPSZ256rmkz:  in processInstruction()
468     return ProcessUNPCKPS(X86::VPUNPCKLDQZ256rmkz);  in processInstruction()
469   case X86::VUNPCKLPSZrmkz:  in processInstruction()
470     return ProcessUNPCKPS(X86::VPUNPCKLDQZrmkz);  in processInstruction()
471   case X86::UNPCKHPSrm:  in processInstruction()
472     return ProcessUNPCKPS(X86::PUNPCKHDQrm);  in processInstruction()
473   case X86::VUNPCKHPSrm:  in processInstruction()
474     return ProcessUNPCKPS(X86::VPUNPCKHDQrm);  in processInstruction()
475   case X86::VUNPCKHPSYrm:  in processInstruction()
476     return ProcessUNPCKPS(X86::VPUNPCKHDQYrm);  in processInstruction()
477   case X86::VUNPCKHPSZ128rm:  in processInstruction()
478     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rm);  in processInstruction()
479   case X86::VUNPCKHPSZ256rm:  in processInstruction()
480     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rm);  in processInstruction()
481   case X86::VUNPCKHPSZrm:  in processInstruction()
482     return ProcessUNPCKPS(X86::VPUNPCKHDQZrm);  in processInstruction()
483   case X86::VUNPCKHPSZ128rmk:  in processInstruction()
484     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rmk);  in processInstruction()
485   case X86::VUNPCKHPSZ256rmk:  in processInstruction()
486     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rmk);  in processInstruction()
487   case X86::VUNPCKHPSZrmk:  in processInstruction()
488     return ProcessUNPCKPS(X86::VPUNPCKHDQZrmk);  in processInstruction()
489   case X86::VUNPCKHPSZ128rmkz:  in processInstruction()
490     return ProcessUNPCKPS(X86::VPUNPCKHDQZ128rmkz);  in processInstruction()
491   case X86::VUNPCKHPSZ256rmkz:  in processInstruction()
492     return ProcessUNPCKPS(X86::VPUNPCKHDQZ256rmkz);  in processInstruction()
493   case X86::VUNPCKHPSZrmkz:  in processInstruction()
494     return ProcessUNPCKPS(X86::VPUNPCKHDQZrmkz);  in processInstruction()