Instruction Scheduling, Register Allocation, Partial Redundancy Removal
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1 CSC 255/455 Softwr Anlyss n Improvmnt Instruton Suln, Rstr Alloton, Prtl Runny Rmovl Lol Instruton Suln A Prmr for L 3 Comp 412 COMP 412 FALL 2008 Instrutor: Cn Dn Copyrt 2008, Kt D. Coopr & Ln Torzon, ll rts rsrv. Stunts nroll n Comp 412 t R Unvrsty v xplt prmsson to mk ops of ts mtrls for tr prsonl us. Fulty from otr utonl nsttutons my us ts mtrls for nonproft utonl purposs, prov ts opyrt not s prsrv. Wt Mks Co Run Fst?! Mny oprtons v non-zro ltns! Morn mns n ssu svrl oprtons pr yl! Exuton tm s orr-pnnt (n s n sn t 60 s) Assum ltns (onsrvtv) Oprton Cyls lo 3 stor 3 loi 1 1 mult 2 f 1 fmult 2 sft 1 rn 0 to 8! Los & stors my or my not lok >! Non-lokn!fll tos ssu slots! Brn osts vry wt pt tkn! Brns typlly v ly slots >! Fll slots wt unrlt oprtons >! Prolts rn upwr! Sulr soul t ltns L 3 wll ul lol sulr Comp 412, Fll Smpl sul 1 loai r0,@w! r1 4 r1,r1! r1 5 loai r0,@x! r2 8 mult r1,r2! r1 9 loai r0,@y! r2 12 mult r1,r2! r1 13 loai r0,@z! r2 16 mult r1,r2! r1 18 storai r1! r0,@w 21 r1 s fr w " w * 2 * x * y * z Sul los rly 1 loai r0,@w! r1 2 loai r0,@x! r2 3 loai r0,@y! r3 4 r1,r1! r1 5 mult r1,r2! r1 6 loai r0,@z! r2 7 mult r1,r3! r1 9 mult r1,r2! r1 11 storai r1! r0,@w 14 r1 s fr 2 rstrs, 20 yls 3 rstrs, 13 yls Rorrn oprtons for sp s ll nstruton suln Comp 412, Fll Instruton Suln (Ennr s Vw) T Prolm Gvn o frmnt for som trt mn n t ltns for nvul oprton, rorr t oprtons to mnmz xuton tm Instruton Suln (T Astrt Vw) To ptur proprts of t o, ul prn rp G! Nos n! G r oprtons wt typ(n) n ly(n)! An = (n 1,n 2 )! G f & only f n 2 uss t rsult of n 1 T Conpt Mn srpton slow Sulr o fst o T Tsk! Prou orrt o! Mnmz wst yls! Avo splln rstrs! Oprt ffntly f T Co T Prn Grp Comp 412, Fll Comp 412, Fll
2 Instruton Suln (Dfntons) A orrt sul S mps n! N nto non-ntv ntr rprsntn ts yl numr, n 1. S(n)! 0, for ll n! N, ovously 2. If (n 1,n 2 )! E, S(n 1 ) + ly(n 1 )! S(n 2 ) 3. For typ t, tr r no mor oprtons of typ t n ny yl tn t trt mn n ssu T lnt of sul S, not L(S), s L(S) = mx n! N (S(n) + ly(n)) T ol s to fn t sortst possl orrt sul. S s tm-optml f L(S)! L(S 1 ), for ll otr suls S 1 A sul mt lso optml n trms of rstrs, powr, or sp. Instruton Suln (Wt s so ffult?) Crtl Ponts! All oprns must vll! Multpl oprtons n ry! Movn oprtons n lntn rstr lftms! Pln uss nr fntons n sortn rstr lftms! Oprns n v multpl prssors Totr, ts ssus mk suln r (NP-Complt) Lol suln s t smpl s! Rstrt to strt-ln o! Consstnt n prtl ltns Comp 412, Fll Comp 412, Fll Instruton Suln: T B Ptur 1. Bul prn rp, P 2. Comput prorty funton ovr t nos n P 3. Us lst suln to onstrut sul, on yl t tm. Us quu of oprtons tt r ry. At yl I. Coos t st prorty ry oprton n sul t II. Upt t ry quu Lol lst suln! T omnnt lortm for twnty yrs! A ry, urst, lol tnqu Lol Lst Suln Cyl " 1 Ry " lvs of P Atv " Ø wl (Ry # Atv $ Ø) f (Ry $ Ø) tn rmov n op from Ry S(op) " Cyl Atv Atv # op Cyl " Cyl + 1 for op % Atv f (S(op) + ly(op)! Cyl) tn rmov op from Atv for sussor s of op n P f (s s ry) tn Ry " Ry # s Rmovl n prorty orr op s omplt xuton If sussor s oprns r ry, put t on Ry Comp 412, Fll Comp 412, Fll Suln 1.! Bul t prn rp Suln 1.! Bul t prn rp 2.! Dtrmn prorts: lonst ltny-wt pt f f 5 3 T Co T Prn Grp T Co T Prn Grp Comp 412, Fll Comp 412, Fll 2008
3 Suln 1.! Bul t prn rp 2.! Dtrmn prorts: lonst ltny-wt pt 3.! Prform lst suln 1) : l o A I r r 1 2) : l o A I r x! r 2 3) : l o A I r y! r 3 4) : r 1, r 1! r 1 5) : m ul t r 1, r 2! r 1 6) : l o A I r r 2 7) f: m ul t r 1, r 3! r 1 9) : m ul t r 1, r 2! r 1 11) : s t o r A I r 1! r T Co Nw rstr nm us f 5 3 T Prn Grp Mor Lst Suln Lst suln rks own nto two stnt lsss Forwr lst suln Bkwr lst suln! Strt wt vll oprtons! Strt wt no sussors! Work forwr n tm! Work kwr n tm! Ry! ll oprns vll! Ry! ltny ovrs uss Vrtons on lst suln! Prortz rtl pt(s)! Sul lst us s soon s possl! Dpt frst n prn rp (mnmz rstrs)! Brt frst n prn rp (mnmz ntrloks)! Prfr oprton wt most sussors Comp 412, Fll Comp 412, Fll Slk s Suln Stuy 3 omput monts of work Non-optml lst suls (%) vrsus vll prlllsm 1 funtonl unt, rnomly nrt loks of, 20, 50 ops Rstr Alloton Prt of t omplr s k n IR Instruton Slton m rstr sm Instruton Suln m rstr sm Rstr Alloton k rstr sm! 85,000 rnomly nrt loks! RBF foun optml suls for > 80% T-rkn mttrs us t ffts t o wn quu s > 1 lmnt Comp! Pk 412, ffulty Fll 2008 (for RBF) s roun Errors Crtl proprts! Prou orrt o tt uss k (or fwr) rstrs! Mnmz los n stors! Mnmz sp us to ol spll vlus! Oprt ffntly O(n), O(n lo 2 n), my O(n 2 ), ut not O(2 n ) Comp 412, Fll An : Bottom-up! Lv Rns Co to Intrfrn Grp 1 loi 28! r1 // r1 2 lo r1! r2 // r1 r2 3 mult r1, r2! r3 // r1 r2 r3 4 loi 5! r4 // r1 r2 r3 r4 5 su r4, r2! r5 // r1 r3 r5 6 loi 8! r6 // r1 r3 r5 r6 7 mult r5, r6! r7 // r1 r3 r7 8 su r7, r3! r8 // r1 r8 9 stor r8! r1 // NOTE: lv sts on xt of nstruton s415, sprn 09 y Ul Krmr Ltur 1 47
4 An : Bottom-up! Lv Rns 1 loi 28! r1 // r1 2 lo r1! r2 // r1 r2 3 mult r1, r2! r3 // r1 r2 r3 4 loi 5! r4 // r1 r2 r3 r4 5 su r4, r2! r5 // r1 r3 r5 6 loi 8! r6 // r1 r3 r5 r6 7 mult r5, r6! r7 // r1 r3 r7 8 su r7, r3! r8 // r1 r8 9 stor r8! r1 // Intrfrn Grp to Colorn NOTE: lv sts on xt of nstruton s415, sprn 09 y Ul Krmr Ltur 1 47 Grp Colorn (A Bkroun Drsson) T prolm A rp G s s to k-olorl ff t nos n ll wt ntrs 1 k so tt no n G onnts two nos wt t sm ll s 2-olorl 3-olorl E olor n mpp to stnt pysl rstr Glol Rstr Alloton Tkn lol ppro! Anon t stnton twn lol & lol! Mk systmt us of rstrs or mmory! Aopt nrl sm to pproxmt oo lloton Grp olorn prm (Lvrov & (ltr) Ctn ) 1! Bul n ntrfrn rp G I for t prour! Computn LIVE s rr tn n t lol s! G I s not n ntrvl rp 2! (try to) onstrut k-olorn! Mnml olorn s NP-Complt! Spll plmnt oms rtl ssu 3! Mp olors onto pysl rstrs Comp 412, Fll Comp 412, Fll Improvmnt n Colorn Sm Optmst Colorn (Brs, Coopr, Knny, n Torzon)! If Ctn s lortm rs stt wr vry no s k or mor nors, t ooss no to spll.! Brs s, tk tt sm no n pus t on t stk! Wn you pop t off, olor mt vll for t! 2 Rstrs: Ctn s lortm mmtly splls on of ts nos Lzy Co Moton (Prtl Runny Elmnton)! For xmpl, no n mt v k+2 nors, ut tos nors mt only us 3 (<k) olors!!dr s loos uppr oun on olorlty Comp 412, Fll
5 Prtlly Runnt Exprsson An xprsson s prtlly runnt t p f t s runnt lon som, ut not ll, pts rn p Prtlly Runnt Exprsson An xprsson s prtlly runnt t p f t s runnt lon som, ut not ll, pts rn p! + 1! +! + 1! +! +! + 1! +! + 1! +! +! +! +! +! + Insrtn opy of! + ftr t fnton of n mk t runnt fully runnt? Insrtn opy of! + ftr t fnton of n mk t runnt fully runnt? COMP 512, Sprn 2009! * 3! COMP 512, Sprn 2009! * 3! Lzy Co Moton Sours Knoop, Rutn, Stffn, PLDI 1992 Drsslr n Stl, SIGPLAN 1993 Cptr, Ennrn omplr Intuton omputr vll n ntpl xprssons omput t rlst plmnt for xprsson pus xprssons own t CFG to t lst pont wt no runny Solvn st of t flow qutons vllty, ntpl, rlst plmnt, ltr plmnt, nsrt, lt 27
Instruction Scheduling
Instrution Sulin Not y Bris Aktmur: Our slis r pt from Coopr n Torzon s slis tt ty prpr for COMP 412 t Ri. Copyrit 20, Kit D. Coopr & Lin Torzon, ll rits rsrv. Stunts nroll in Comp 412 t Ri Univrsity v
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