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"$<䉑Ug7ߠ]X"$N$-ywUDⲘ!5ht$"$@u8m$"$D X"7z_"$7ߋh ⦦,9! ٘$$"$|ZWB̳eBK"$\~u5#Fgs$"$˦hM_JmQ$"$~~dQ>#"$#56ȑΫ$$$$"$UEr+}qo0&$$2$>Z5P튭sh4 V$$$$"$b$큘@ԑKN $$$$$$"$}^CCqƟY"$t0Q^kYKl$"$Zl STxT"$P,妔"$']XWo,P U"$j:?H[ndO"$Hذ WS/i+"$~l-`EDc"${WVSuA<d"$ope aO`)* "$YfoY=D $$"$!j6V:_HgbO "$/&"B9 0AA`33@w0C ʚ;ʚ;g4ddk 0(ppp@ <4dddd8A10l4g <4BdBd8c20l80___PPT10 ?8- $ 2006 Vimal ReddyO  =x fVimal Reddy Sailashri Parthasarathy Eric Rotenberg64  6  Transient Fault ToleranceTransient faults Temporary hardware faults Worsening with shrinking technology Soft errors Noise Prominent solution: Redundant Multithreading Full program duplication Complete fault tolerance High overheads>-A>  -A Full Redundant Execution6 !Partial Redundant Threading (PRT)Only partially duplicate a program Shorter the redundant thread, lesser the overhead Approach taken to create partial thread affects fault tolerance\Conventional PRT]Conventional PRT^Prediction-based PRT _Prediction-based PRT `Prediction-based PRT aPrediction-based PRT NRelaxing checking constraintsbRelaxing checking constraints PRT SpectrumSlipstream Overview Slipstream Overview Slipstream Overview Slipstream Overview !Confident BranchConfident BranchConfident Dead WriteConfident Dead WriteConfident Silent Write/StoreConfident Silent Write/StoreConfident Silent Write/StoreConfident Silent Write/Store1#Slipstream Fault Detection CoverageWe showed confident predictions detect faults Additional coverage = Correctly predicted confident instr. + Their backward slices Mispredictions vulnerable, but rare in Slipstream Mispredictions + backward slices = only 0.1% instr...ZZ.,cye&Fault Coverage: Detection vs. RecoverySlipstream Fault Recoveryc i  j "k $Indirect Check of Silent Write/Store"Direct Check of Silent Write/Store+#Novel Framework to Analyze CoverageEach instr. considered  candidate faulty Coverage = # of instr. checked before committal to arch. statei@i,0*- t lC Clarification!Results: Microarchitecture modelsVBreakdown of InstructionsBreakdown of Instructions/Fault Coverage 0#Slipstream Performance (SMT 8-wide) oF'Performance Impact of Enhanced Recovery((  qH ConclusionsConfident predictions can replace duplication Slipstream case study : Redundant thread reduced by up to 57% while retaining near-100% coverage Prediction-based PRT offers a new avenue for efficient fault tolerant computing@.aP.` P/HNOPRSu !#%&'()*+,-./01234567 8!9":#;$<%=&>'?(@)A*B+C,D4  0` 33` Sf3f` 33g` f` www3PP` ZXdbmo` \ғ3y`Ӣ` 3f3ff` 3f3FKf` hk]wwwfܹ` ff>>\`Y{ff` R>&- {p_/̴>?" dd@$|?" dd@   " @ ` n?" dd@   @@``PR    @ ` ` p>>   (    60  `}  T Click to edit Master title style! !  0˒  `  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  0t     \*  0 ^ `  Z*  <pGpG3c"$`?+n wNC STATE UNIVERSITYH0 G G   0  @ ASPLOS-XII  H  0޽h ? 33___PPT10i.+D=' = @B + Default Design0 zr@ (    0V P   V P*    0V    V R*  d  c $ ?  V  0 V  0 V RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  6@&V _P  V P*    6 +V _  V R*  H  0޽h ? 3380___PPT10.%.-&0 =5  (    6Є `  mUnderstanding Prediction-Based Partial Redundant Threading for Low-Overhead, High-Coverage Fault Tolerancenn  <xӄ P`      `Ԅxaxa1 ? @  VDept. of Electrical & Computer Engineering North Carolina State University Raleigh, NCWPW^  C 6ASEALcommercial" j    `لxaxa1 ?P @P  Architecture Modeling Infrastructure Group Intel Corporation Hudson, MA$NP LH  0޽h ? 33___PPT10i.Pb+D=' = @B +} 0 0 $(   r  S ]V `}  V r  S \^V ` V H  0޽h ? 33___PPT10i.C|+D=' = @B +% (0   W0< (  0~ 0 s *8iV `}  V  .0 0sV p ,$ 0 T$Full duplication 100% fault coverage%% 70 TA& ? V 90  `A[ ?"`@I  V ?0 0A?P`Y ,$@0l `  G0` ,$@0N   B0 0 ZB C0 s *DԔ0PZB D0 s *DԔP0`B E0 0DԔ  F0 <yV`?2 5fault H0 0A?G ,$@0z `  I0 f `  ,$@0N   J0 0 ZB K0 s *DԔ0PZB L0 s *DԔP0`B M0 0DԔ  N0 <V`?2 5fault O0 0A?` `i,$@ 0 Q0 0A? ,$@0 T0 0A ? ,$D0 U0 0A ?N,$D 0 V0 6o"` ,$D0 W0 6o"` ,$@ 0H 0 0޽h ? 33D TIMING(|7.9|5.9|2.6|1.2|2.5___PPT10u.޳ Zu$+@D' = @B D' = @BA?%,( < +O%,( < +D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*G0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*H0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*?0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T0%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*V0%(D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*I0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Q0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*O0%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*U0%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*W0%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*V0%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*.0%(+8+0+.00 + )0 0(  x  c $V `}  V x  c $DV ` V H  0޽h ? 33___PPT10i.C|+D=' = @B +! *0 5 - 0 KP  (  Pz `  P f `  ,$@0N   P 0 ZB P s *DԔ0PZB P s *DԔP0`B P 0DԔ  P <ܱV`?2 5fault P 0A?` `i,$@0 P 0A? ,$@0 P BܵV `}  V   P 6A\?@ 0,$@0>l k  9Pk  ,$@0` 7P 0A^?E k ZB 8P s *DjJ  :P 0A?  ,$@0 P  `A  ?"` V ?P 0A_?b ,$D0 BP 6o"`p  ,$D 0H P 0޽h ? 336 TIMING|4.6|10.6|3.4N___PPT10..޳ Zu$+G?)D' = @B D' = @BA?%,( < +O%,( < +D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*:P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*9P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*?P%(D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*P%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*+B#style.visibility<*BP%(+w) +0 g _ 'h (  hz `  h ` ,$@0N   h 0 ZB h s *DԔ0PZB h s *DԔP0`B h 0DԔ   h <8V`?2 5fault  h 0A?G ,$D0 h 0A? ,$D0 h B8V `}  V ^ h 6A_?b F k  h k  ` h 0A^?E k ZB h s *DjJ X h 0A?   h 0A`? ,$@0 h 0A? p ,$@0 h 0tV  @ ,$ 0 rBArbitrary duplication Non-duplicated portions lose fault coverage CC  h 0A ?@0 ,$@0 $h  `A  ?"` VX %h 0A\?@ 0l &h 6o"`p   'h BVo"`0 P ,$D 0 : H h 0޽h ? 338 TIMING|2.9|8.8|2|1.4p___PPT10P.޳ Zu$+eoD' V= @B Do' = @BA?%,( < +O%,( < +D' =%(%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* h%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*h%(D<' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* h%(D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*hD' =0l9 BBBB*<3<*h)?D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<* hD' =0l9 BBBB*<3<* h)?DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*'h%(Di' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<* h%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*h%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*h%(+p+0+h0 ++0+'h0 +' ,0  ~ 0l (  l  l BV `}  V F k  l k  ` l 0A^?E k ZB l s *DjJ X l 0A?   l 0Aa?[ ,$@0 l 0A ?Y M ,$@0 l  `A  ?"` V "l 6V  @,$0 IConfident prediction of A #l 6eV \ ,$ 0 h8Freq. Case: Correct prediction (e.g., 99.9% of the time)99X $l 0A\?@ 0X %l 0A_?b  'l 6o"`p  ,$D 0z `  (l  `  ,$@0N   )l 0 ZB *l s *DԔ0PZB +l s *DԔP0`B ,l 0DԔ  -l <Xe`?2 5fault .l 0A? ,$@0 /l 0A? `,$@ 0 0l 0A ?p,$D 0H l 0޽h ? 33> TIMING"|2.8|16.6|1.9|1.8o___PPT10O.޳ Zu$+;Y D' = @B Dn' = @BA?%,( < +O%,( < +D@ ' =%(D ' =%(Dy' =4@BBB B%()))D' =-6B+checkerboard(across)*<3<*lD' =1:Bhidden*o3>+B#style.visibility<*l%(Dy' =4@BBB B%()))D' =-6B+checkerboard(across)*<3<*lD' =1:Bhidden*o3>+B#style.visibility<*l%(D{' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*l%(D' =-6B+checkerboard(across)*<3<*lD{' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*l%(D' =-6B+checkerboard(across)*<3<*lD' =A@BBB B0B%()))D' =1:Bvisible*o3>+B#style.visibility<*"l%(D' =-6B+checkerboard(across)*<3<*"lD' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*(l%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*.l%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*/l%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*0l%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*'l%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*#l%(+p+0+"l0 ++0+#l0 +B -0   "t. (  tz `  t ` ,$@0N   t 0 ZB t s *DԔ0PZB t s *DԔP0`B t 0DԔ  t <%e`?2 5fault  t B'e `}  e X t 0Aa?[ X t 0A ?Y M  t  `A  ?"` e t 0A? i ,$@0 t 0A?P`Y ,$@0 t 0A ?0  ,$D0X t 0A\?@ 0X t 0A_?b  t 6o"` ,$@0l  t 6o"`p   !t 6.e  @ IConfident prediction of A "t 63eV \  h8Freq. Case: Correct prediction (e.g., 99.9% of the time)99H t 0޽h ? 33L $ TIMING|5.8 ___PPT10 .޳ Zu$+nwD ' = @B D ' = @BA?%,( < +O%,( < +D' =%(%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*t%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*t%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*t%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*t%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*t%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<* t%(+ .0   xD (  xz `  x ` ,$@0N   x 0 ZB x s *DԔ0PZB x s *DԔP0`B x 0DԔ  x < Ie`?2 5fault  x BJe `}  e X  x 0Aa?[ X  x 0A ?Y M  x 6T!e  @ IConfident prediction of A x 6QeV \ ,$0 h8Rare case: Incorrect prediction (e.g., 0.1% of the time)99 x  `A  ?"` e x 0A? i ,$@0 x 0A`? ,$@0 x 0A ?0 ` ,$@0 x 0A? p i ,$D0X x 0A\?@ 0X x 0A_?b l x 6o"`p   x BpZeo"`` ,$D 0 : H x 0޽h ? 33, TIMING|2.7|5.8\___PPT10<.޳ Zu$+D' ce= @B D[' = @BA?%,( < +O%,( < +D' =%(%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(DT ' =%(D ' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*xD' =0l9 BBBB*<3<*x)?D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*xD' =0l9 BBBB*<3<*x)?DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(+p+0+x0 ++0+x0 + /0   |(  |  | B(je `}  e X  | 0Aa?[ X  | 0A ?Y M  |  `A  ?"` e+ | 0|se   Confident predictions are good proxies for redundant execution Predictions break thread inter-dependence Near-100% fault coverage.\X | 0A\?@ 0X | 0A_?b l | 6o"` H | 0޽h ? 33___PPT10i.޳ Zu$+D=' = @B +  00 p W1(  ~  s * eM  e  0  fA k?AA ?"`f m k e  <A g? ?"``p` g = 0e ,$0 - S(p) and T(p) are removable,8 ,  P ` J 0A?, ` L 0A?) U t8 @   Q P n M 0A?"`@ 0   O"  `A  ?"`K   el W 6o"` H  0޽h ? 33 & TIMING |15.6___PPT10.C|+H[DO' = @B D ' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*=%(+8+0+=0 +;S 10  $2 o(  ~  s *eM  e  0 # lA @? ?"`f m @ e  <A A? ?"``p` A  0e  - S(p) and T(p) are removable,  0e   j6 Such removal can shorten partial thread significantly7-7F ,    `  0A?, `   0A?) U l   6A?"` X  0A?   <A+ C??'08 C$D0  <A) E?? ` 8 E$@0  0`e* 0 ,$0 X$ But, no predictions to replace them%-%   # U,$@ 0ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ   Be0P,$ 0 5fault  0A?  ,$@ 0   0A? e ,$@0 ! 0A ?@ @@ ,$D0 " 6o"``  ,$@0 # 6o"` ,$@!02 $ B8eԔ"`` ` ,$@0 : Jl 00  '0@` ,$D 0ZB % s *DԔ0 lB & <DԔ 0  ( 6o"`  ,$@0   )# p,$@0ZB * s *DԔ0PZB + s *DԔP0`B , 0DԔ  - <Ⱥe0 ,$0 5fault 1 0A? `i ,$D0 2 0A?`,$D0H  0޽h ? 33=p TIMINGT|6.6|5.3|5.2|4.3|2.1|4|2.2|0.5|0.5|0.4|0.3t=___PPT10T=.C|+lD;' = @B D;' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(D|' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*"%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*#%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(DY' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*$%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*'%(Dd' =%(D ' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*$%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*1%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*!%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*(%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*"%(D,' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*-%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*)%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*!%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<* %(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*1%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*2%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*!%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*(%(+P+0+0 ++0+0 ++0+0 ++0+$0 ++0+$0 ++0+-0 +  20 9(  ~  s *e `  e  0 ZA$ ?AA ?@Pp   e  0e p,$0 MCase study: PRT on Slipstream  6xe2 0  $M. Gomaa T. N. Vijaykumar ISCA 2005( @ %,     6eA p  ?Z. Purser K. Sundermoorthy E. Rotenberg MICRO 2000 ASPLOS 2000( @@ &  6e9   aN. Wang S. J. Patel DSN 2004( @ H  0޽h ? 33 & TIMING |48.9___PPT10.޳ Zu$+]%DO' = @B D ' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(+8+0+0 +02 30 +=  (  ~  s *xtp `@  t   Hx t8c"` >A Sl 0a  ;0a ,$D0  <Pt  > Delay Buffer A@ 0a  80a T P@0  # 0 t   68c"`P@t   68c"`P`t   68c"`P`t   68c"`Pt   68c"`Pt  68c"`Pt  68c"`P0 2T    # ` ` ZB  s *D3Ԕ  lB  <D3Ԕ    6t"` a  OBranch + Value outcomesE3z  @  0,$D02T  @ # x@ZB  s *D3Ԕy@ylB  <D3Ԕ @@  <Pt"` S @verifyE3 ' < t"` bp DSMT ProcessorC2 ( <@%t3"`  `,$D0 TVerified Architectural StateE3vl    9  ,$D0ZB  s *D3Ԕ101  <@)t3"`}  @R-stream G3ZB + s *D3Ԕ 0` lB , <D3Ԕ `  2 ) B-t3"` @`,$D0 VUnverified Architectural StateE3l @`  =@` ,$D0`B  0D3ԔQ 0Q   B2t3"`@~  @A-stream G3`B * 0D3ԔP `` rB - BD3Ԕ`` `  l 0  2` ,$D0 . <T/t3"` 0  :  / <+B#style.visibility<*=%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*9%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*;%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*(%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*)%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*2%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*<%(D' =%(D4' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(DC' =A@BBBB0B%()D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*4D' =0l9 BBBB*<3<*4)?++0+(0 ++0+)0 ++0+40 ++0+40 +% 40 2;(  ~  s *Wtp `@  t   Hat8c"` >A ;F 0a   0a   <dt  > Delay Buffer A+N 0a   0a T P@0  # 0 t  68c"`P@t   68c"`P`t   68c"`P`t   68c"`Pt   68c"`Pt   68c"`Pt  68c"`P0 2T    # ` ` ZB  s *D3Ԕ  lB  <D3Ԕ    6kt"` a  OBranch + Value outcomesE3RF  @  02T  @ # x@ZB  s *D3Ԕy@ylB  <D3Ԕ @@  <Hqt"` S @verifyE32  <+B#style.visibility<*9%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*;%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*7%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*2%(+p+0+70 ++0+;0 + 50 24(  ~  s *tp `@  t   Ht8c"` >A ;F 0a   0a   <\t  > Delay Buffer A+N 0a   0a T P@0  # 0 t  68c"`P@t   68c"`P`t   68c"`P`t   68c"`Pt   68c"`Pt   68c"`Pt  68c"`P0 2T    # ` ` ZB  s *D3Ԕ  lB  <D3Ԕ    6t"` a  OBranch + Value outcomesE3RF  @  02T  @ # x@ZB  s *D3Ԕy@ylB  <D3Ԕ @@  <t"` S @verifyE32  <t3"`  ` TVerified Architectural StateE3PF       ZB  s *D3Ԕ101  <t3"`}  @R-stream G3ZB  s *D3Ԕ 0` lB  <D3Ԕ ` RB  s *D3Ԕ0Q Q   <`t3"`@~  @A-stream G32   <t3"` @` VUnverified Architectural StateE3XB ! 0D3ԔP `` dB " <D3Ԕ` `` 6F ? g  # ? g T   $# ? & t % 68c"`$  & 6t"`t  JSlipstream ComponentsA2T  0 '  '#  g ZB (B s *D3Ԕ 0 lB ) <D3Ԕ ' RF @@  *  2T u@  +# @ ZB , s *D3Ԕ{@{lB - <D3Ԕu@ @ . <t"`d@  @removeE3 0 <t"` bp DSMT ProcessorC 1 <tGH  P TPredictions act as proxies0@ @( 2 <A ;F 0a   0a   <x  > Delay Buffer A+N 0a   0a T P@0  # 0 t  68c"`P@t   68c"`P`t   68c"`P`t   68c"`Pt   68c"`Pt   68c"`Pt  68c"`P0 2T    # ` ` ZB  s *D3Ԕ  lB  <D3Ԕ    6 x"` a  OBranch + Value outcomesE3RF  @  02T  @ # x@ZB  s *D3Ԕy@ylB  <D3Ԕ @@  <x"` S @verifyE32  <Lx3"`  ` TVerified Architectural StateE3PF       ZB  s *D3Ԕ101  <x3"`}  @R-stream G3ZB  s *D3Ԕ 0` lB  <D3Ԕ ` XB  0D3Ԕ0Q Q    Bxx3"`@~  @A-stream G32 ! Bp#x3"` @` VUnverified Architectural StateE3^B " 6D3ԔP `` jB # BD3Ԕ` `` 6F ? g  $ ? g T   %# ? & t & 68c"`$  ' 64)x"`t  JSlipstream ComponentsA2T  0 '  (#  g ZB )B s *D3Ԕ 0 lB * <D3Ԕ ' RF @@  +  2T u@  ,# @ ZB - s *D3Ԕ{@{lB . <D3Ԕu@ @ / </x"`d@  @removeE3M 1 <x3xG_HG<  ` m Confident branches Confident dead writes Confident silent writes Slices whose leaves are any of the aboveXn1@  EEAKE 2 <;x"` bp DSMT ProcessorC 3 <?xGH  P TPredictions act as proxies0@ @( 5 < DxGaH   R Detect predictable instructions Predict based on repeated detection (confidence)N!1@ 21 !E2E 6 < KxP 7  =monitor3H  0޽h ??0135 33___PPT10i.޳ Zu$+D=' = @B +<# 0 U M PQ (  ~  s * Wx  x  % <AB ??"`  8 $D 0 & <A ??`0 8 $D0 ' <A* ??"`{  8 $@ 0 * <Yx p  ,$0 b$Correct Branch Prediction (Taken)"% 7 <[xQ~ ^ ?Main (R-stream) 8 <h^xQ7 ^ BPartial (A-stream) : <A 0 ??`0 8 0 $@0 @ <gxP j p ,$ 0 ? (Not Taken) 3R B s *A P    F#  ,$@0ZB G s *DԔ0PZB H s *DԔP0`B I 0DԔ l p Mp,$@0ZB J s *DԔpZB KB s *DԔp`B L 0DԔ@p N <PTxpO,$0 5faultf Q 0A9?"`? R H  0޽h ? 33: TIMING|11.9|7.9|4.6|2E___PPT10%.޳ Zu$+ūmDQ' = @B D ' = @BA?%,( < +O%,( < +D' =%(Da' =%(Dy' =4@BBB B%()))D' =-6B+checkerboard(across)*<3<*QD' =1:Bhidden*o3>+B#style.visibility<*Q%(D' =A@BBB B0B%()))D' =1:Bvisible*o3>+B#style.visibility<**%(D' =-6B+checkerboard(across)*<3<**Dq' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*N%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*M%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*:%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*F%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*&%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*@%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*'%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%%(++0+*0 ++0+@0 ++0+N0 +u 0 S K  (  ~  s *Xx  x x  <A  ??`0     <$xQ~ ^ ?Main (R-stream)  <xQ7 ^ BPartial (A-stream)x   <A  ??`0      <$xP j p  ? (Not Taken) 3R   s *A P L   #  ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ zF p  pZB  s *DԔpZB B s *DԔp`B  0DԔ@p  <`xpO 5fault  <x)V p  h*Incorrect Branch Prediction (Not Taken)"+ 3  0A5?0 0 ,$@0  0A ? P ,$@0H  0޽h ? 33 $ TIMING|5.7 ___PPT10v .޳ Zu$++iDJ ' = @B D ' = @BA?%,( < +O%,( < +D<' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*D' =0l9 BBBB*<3<*)?D6' =4@BBBB%()@D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*D' =0l9 BBBB*<3<*)?+- 0   %G (    <A  ??`0 8  $D0  <hxQ~ ^ ?Main (R-stream)  <̴xQ7 ^ BPartial (A-stream)   <A  ??`0 8  $@0   #  ,$@0ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ z p  p,$@0ZB  s *DԔpZB B s *DԔp`B  0DԔ@p  <xpO,$0 5faultf  0A?"` S   0Aj? @ ,$D 0  0tx@q ,$0 WCorrect Prediction (Dead)"f # 0A4?"`? R  % HLx   x H  0޽h ? 336 TIMING|11.9|9.6|6.2___PPT10.޳ Zu$+K~D' = @B D' = @BA?%,( < +O%,( < +DY' =%(D' =%(DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*#D' =1:Bhidden*o3>+B#style.visibility<*#%(DX' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B+checkerboard(across)*<3<*Dq' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(+p+0+0 ++0+0 +# 0  | ( (  x  <A  ??`0     <pxQ~ ^ ?Main (R-stream)  <xQ7 ^ BPartial (A-stream)x  <A  ??`0   L   #  ZB   s *DԔ0PZB   s *DԔP0`B   0DԔ zF p   pZB   s *DԔpZB B s *DԔp`B  0DԔ@p  <xpO 5faultf  0A?"` S   <xjD  EIncorrect Prediction  <x (p  > (Not Dead)  3  s *A&  @,$@0  0xp  ,$0 5?$3  0A.?p @ ,$D0  0Ai?; ,$@0   0A5? 0 0 ,$@ 0 ! 0A ?  ,$@0 # Hxx   x  ( s *A/"` J :,$D0H  0޽h ? 338 TIMING|6|2.5|5.1|4.2___PPT10.޳ Zu$+DH' x= @B D' = @BA?%,( < +O%,( < +D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*(%(D' =%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(DY' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%()?)?Dq' =.97 BBBBBKM 0.00434 0.07264 L 0.00434 0.23919 *3>*B ppt_xB ppt_y=@0BBAApBBBY=<*D<' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*!%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* %(D6' =4@BBBB%()D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<* D' =0l9 BBBB*<3<* )?D6' =4@BBBB%()D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*!D' =0l9 BBBB*<3<*!)?+8+0+0 +  0 `X(0 q(  ( ( < Q~ ^ ?Main (R-stream) ( <(Q7 ^ BPartial (A-stream) ( HL    f ( 0A,?"` S  1( Ho"`@ 0  872f F( 0A1?"`? R  G( Bo"`@ 0` 0  872X O( 0A=? @ uf P( 0AF?"` sdB R( <DԔB 2 dB S( <DԔC 3 dB U( <DԔ0  dB V( <DԔ*   W( < @  672 X( < $ 0 @  672H ( 0޽h ? 33___PPT10i.޳ Zu$+D=' = @B +  !0 g(    <1Q~ ^ ?Main (R-stream)  <6Q7 ^ BPartial (A-stream)  H :    f  0A,?"` S   B;o"`@ 0  73f   0A1?"`? R    B?o"`@ 0` 0  73X   0A=? @ uf   0AF?"` sdB   <DԔB 2 dB  <DԔC 3 dB  <DԔ0  dB  <DԔ*    <E u @  53  <I @  53H  0޽h ? 33___PPT10i.޳ Zu$+D=' = @B +< #0 @"(G(    <`WQ~ ^ ?Main (R-stream)  <\Q7 ^ BPartial (A-stream)  H|_    f  0A,?"` S   B`o"`@ 0  7Vf   0A1?"`? R    Beo"`@ 0` 0  @ X   0A=? @ uf   0AF?"` sdB   <DԔB 2 dB  <DԔC 3 dB  <DԔ0  dB  <DԔ*    <j @  5V  <x) @  5V  0q@ `, ,$0 YCorrect Prediction (Silent)"    #  ,$D0ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ z p  p,$@0ZB  s *DԔpZB B s *DԔp`B  0DԔ@p  <,y_,$0 5fault ! <} 7 ,$ 0 5X3 " <H PY`  5V # <  PYW ,$ 0 5X3 $ 0A.? {,$@ 0 % 0A.? ; ,$@ 0 & 0A.?  K,$D0 ' <AB / ??"` 08 / $D0 ( <A* 0 ??"` )8 0 $@0H  0޽h ? 33(N TIMING2|5.8|10.1|3.9|1.3|1.3|5.7O(___PPT10/(.޳ Zu$+D&' = @B Dn&' = @BA?%,( < +O%,( < +D ' =%(D ' =%(DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<* D' =1:Bhidden*o3>+B#style.visibility<* %(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DX' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B+checkerboard(across)*<3<*DY' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D~' =%(D&' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*$%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%%(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DX' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*!%(D' =-6B+checkerboard(across)*<3<*!D' =%(DR' =%(DX' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =-6B+checkerboard(across)*<3<*#DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*!D' =1:Bhidden*o3>+B#style.visibility<*!%(DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*"D' =1:Bhidden*o3>+B#style.visibility<*"%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*&%(D' =%(Dh' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*(%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*'%(+P+0+0 ++0+0 ++0+0 ++0+0 ++0+!0 ++0+#0 + %0 |&(    <XQ~ ^ ?Main (R-stream)  <ܯQ7 ^ BPartial (A-stream)  Hd    f  0A,?"` S   Bo"`@ 0  ;stale3  Bo"`@ 0` 0  @ X   0A=? @ uf   0AF?"` sdB   <DԔB 2 dB   <DԔ0  dB  <DԔ*    0@ `,  `"Incorrect Prediction (Not Silent)"# 3L   #  ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ zF p  pZB  s *DԔpZB B s *DԔp`B  0DԔ@p  <`Ȅ_ 5fault  <8̄ OXW  5X3X  0A.? {X  0A.? ; X   0A.?  K # 0A5? 0 0 %,$@0 $ 0A ? ,$@0X % 0A.? @ KH  0޽h ? 33 $ TIMING|8.5 ___PPT10v .޳ Zu$+!ĤDJ ' = @B D ' = @BA?%,( < +O%,( < +D<' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*$%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D6' =4@BBBB%()D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*#D' =0l9 BBBB*<3<*#)?D6' =4@BBBB%()D' =?B70, 0; .2, .5; .8, .5; 1, 0-g6B fade*<3<*$D' =0l9 BBBB*<3<*$)?+ 0   x(  x~ x s *ք` `0    x c $ބP  ` <$0   x 0X 0 ` ,$0 {)Hence, non-duplicated instr. well covered** x 0 p 0@,$0 h4Slipstream has high fault detection coverage (99.9%)55$  x 0  `,$0 .Prior research: Only duplicated instr. covered/  H x 0޽h ? 330< TIMING |18.6|5.6|21|3.8___PPT10.޳ Zu$+CD' = @B Ds' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* x%(D ' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x.%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x.%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =%(D' =%(DT' =A@BBB B0B%(D' =1:Bvisible*o3>+B#style.visibility<*x%(D' =-6B'blinds(horizontal)*<3<*x++0+x0 ++0+x0 ++0+x0 ++0+ x0 + 70  t<(  t~ t s *   ~ t 0   ~Detection Coverage Represents ability to detect faults Slipstream: 99.9% of instr. Recovery Coverage Ability to rollback to  golden state on fault detection Slipstream s recovery coverage?b@YSXLoH t 0޽h ? 33___PPT10i.C|+D=' = @B +  80   *c (  ~  s *'M    0 # lA ? ?"`r m    <A ? ?"`d ` l   [@,$D0ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ   <\C"?,$0 5fault  <.C"?0 pAw ,$0 8detected   < 2C"? Z ,$0 Z*Flawed Rollback (Conventional Slipstream)++  <,7C"?,$0 @Correct RollbackB  6D| @ ,$D0B  0D|@,$D 0 # 0A? ,$@0X ' 0A?D X * 0A?& ` H  0޽h ? 33> TIMING"|5.8|3.5|4.8|14.1___PPT10f.C|+vڱDZ' = @B D' = @BA?%,( < +O%,( < +D' =%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(Du' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(++0+0 ++0+0 ++0+0 ++0+0 +f 0 PH +O(     0OC"?` ` DReorder Buffer (ROB) 8    0 t  6jJ"` t  6jJ"` pt  6jJ"`p ` t  6jJ"`` P t  6jJ"`P @ t  6jJ"`@ 0 t  6jJ"`0 t  6jJ"`    ## ~` P ,$@0ZB $ s *DԔ0PZB % s *DԔP0`B & 0DԔ  ' <PXC"?Y} ,$0 5fault X8   =&  `B  0D|` `  ( <t\  4headXB ) 0D| P P N  * <l` \  Ecommit to arch. state , B\f3"` ,$@0 : X8 Oz HOz`B " 0D| . <iOz 4tail 30  fA X?AA ?"`  X  5 BAb J? ?"`  J 6 BAe P? ?"` 8 P$@0 7 BAc R? ?"` 8 R$@0 8 BAf U? ?"`j ~8 U$@0l  T  ;` ,$@0h / s *A"`@R  9 BAe V? ?"` @MT  V` : 0A?p50 8l :@   F ,$D0ZB C s *DjJ@@  ZB E s *DjJ:A   I <dq3 $  ,$0 5Flush  J <u# $ ,$0 7Restart  L 0 z   ,$0 IArch. State Corrupted3 M <}0a MBase Slipstream Recovery2 N B3o"`` p,$D#0 >3  O <C"?`@,$0 8detected H  0޽h ? 33LV TIMING:|10|2.9|5.5|1|1.5|2.7|2.7|5.2L___PPT10bL.C|+WD^I' = @B DI' = @BA?%,( < +O%,( < +DY' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*'%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*F%(Df' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*,%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*;%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*O%(D' =%(Dq' =%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*'%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*#%(D ' =%(D; ' =%(D' =4@BBBB%()?)?DP' =.7 BBBBBQM -0.00399 -0.0384 L -0.00399 -0.07171 *3>*B ppt_xB ppt_y=0BBAA<*=D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*3DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*3D' =1:Bhidden*o3>+B#style.visibility<*3%(D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*FDE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*FD' =1:Bhidden*o3>+B#style.visibility<*F%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*L%(D' =%(D' =%(D%' =4@BBBB%()?)?Dy' =.A7 BBBBBSM -0.00399 -0.07171 L -0.00399 -0.12653 *3>*B ppt_xB ppt_y=@0BBAApBBB<*=D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*5DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*5D' =1:Bhidden*o3>+B#style.visibility<*5%(D`' =%(D' =%(D+' =4@BBBB%()?)?D' =.G7 BBBBBYM 1.38889E-6 1.42031E-6 L -0.00122 0.17465 *3>*B ppt_xB ppt_y=@0BBAApBBa 6B=<*HDE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*8D' =1:Bhidden*o3>+B#style.visibility<*8%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*7D' =1:Bhidden*o3>+B#style.visibility<*7%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*6D' =1:Bhidden*o3>+B#style.visibility<*6%(DR' =A@BBB B0B%(D' =-6B'blinds(horizontal)*<3<*,D' =1:Bhidden*o3>+B#style.visibility<*,%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*;D' =1:Bhidden*o3>+B#style.visibility<*;%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*I%(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<*OD' =1:Bhidden*o3>+B#style.visibility<*O%(D' =%(D' =%(D ' =4@BBBB%()?)?D`' =.(7 BBBBBaM -1.38889E-6 0.15545 L -1.38889E-6 3.70113E-7 *3>*B ppt_xB ppt_y=0BBAA<*HDw' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*8%(D' =-6B'blinds(horizontal)*<3<*8Dw' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*7%(D' =-6B'blinds(horizontal)*<3<*7Dw' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*6%(D' =-6B'blinds(horizontal)*<3<*6D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*J%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*I%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*L%(D' =%(DG' =%(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<*JD' =1:Bhidden*o3>+B#style.visibility<*J%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*N%(++0+'0 ++0+'0 ++0+,0 ++0+,0 ++0+I0 ++0+I0 ++0+J0 ++0+J0 ++0+L0 ++0+L0 ++0+N0 ++0+O0 ++0+O0 +L 90 ld )4(    0$C"?` ` DReorder Buffer (ROB).F     0 t  6jJ"` t  6jJ"` pt  6jJ"`p ` t  6jJ"`` P t  6jJ"`P @ t   6jJ"`@ 0 t   6jJ"`0 t   6jJ"` fF    &  `B  0D|` `   <H  4headXB  0D| P P N   < \  Ecommit to arch. state  <Ï3"` ,$@0 : fF Oz  Oz`B  0D|  <0ǏOz 4tail 0 # lA d? ?"` H d$D0   BAb e? ?"` 8 e$@0  BAe f? ?"` 8 f$@0  BAc g? ?"` 8 g$@0  BAf h? ?"`j ~8 h$@0z  T   ` ,$@0h   s *A"`@R  ! BAe i? ?"` @MT  i` " 0A?p50  & <Ώ ,$0 AFlush to ROB head  ' <ӏ  ,$0 7Restart L   *# ~` P ZB + s *DԔ0PZB , s *DԔP0`B - 0DԔ  . <؏C"?Y}  5fault F :@   /  ZB 0 s *DjJ@@  ZB 1 s *DjJ:A   2 0 ݏ0 T REnhancement: ROB-head Recovery 4 <C"?`@,$0 8detected H  0޽h ? 33 54 TIMING|6.4|7.4|2.44___PPT104.C|+1D2' = @B Dx2' = @BA?%,( < +O%,( < +Df' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(D' =%(DW' =%(D' =4@BBBB%()?)?DL' =.7 BBBBBMM -0.00122 0.0303 L -0.00122 0.30789 *3>*B ppt_xB ppt_y=0BBAA<*DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*/D' =1:Bhidden*o3>+B#style.visibility<*/%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<**%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*.%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*&%(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<*4D' =1:Bhidden*o3>+B#style.visibility<*4%(D' =%(D2' =%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*&%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*'%(D' =4@BBBB%()?)?Ds' =.;7 BBBBBMM -0.00122 0.30789 L -0.00122 0.0192 *3>*B ppt_xB ppt_y=@0BBAApBBB<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*++0+0 ++0+0 ++0+&0 ++0+&0 ++0+'0 ++0+.0 ++0+40 ++0+40 +N :0 0(+-(    0C"?` ` DReorder Buffer (ROB).F     0 t  6jJ"` t  6jJ"` pt  6jJ"`p ` t  6jJ"`` P t  6jJ"`P @ t   6jJ"`@ 0 t   6jJ"`0 t   6jJ"` fF     &  `B   0D|` `   <   4headXB  0D| P P N   <H \  Ecommit to arch. state  <3"` ,$@ 0 : fF Oz  Oz`B  0D|  <Oz 4tail 0 # lA  ? ?"`     BAb  ? ?"`     BAe  ? ?"`     BAc  ? ?"`     BAf  ? ?"`j ~  z  T   ` ,$@ 0h  s *A"`@R   BAe  ? ?"` @MT   `  0A?p50   <h  @ ,$0 AFlush to ROB head L    # ~` P ZB ! s *DԔ0PZB " s *DԔP0`B # 0DԔ  $ <&C"?Y}  5fault F :@   %  ZB & s *DjJ@@  ZB ' s *DjJ:A   ( 0+0 T REnhancement: ROB-head Recovery * </C"?`@,$ 0 8detected  + 03 0 0 ,$ 0 IArch. State Corrupted3 , 060 ` ],$0 Limited rollback distance: R-stream retires quickly  accelerated by leading A-stream.;=2 - B93o"`  ,$D0 >3 H  0޽h ? 33X5D TIMING(|2.2|3.9|2.2|6.3|3.95___PPT104.C|+D2' V= @B D{2' = @BA?%,( < +O%,( < +D' =%(D' =%(D' =4@BB*BB%()?)?D(' =.7 BBBBB-M 0 0 L 0 0.33333 E*3>*B ppt_xB ppt_y=0BB<*D' =4@BB*BB%()?)?D(' =.7 BBBBB-M 0 0 L 0 0.33333 E*3>*B ppt_xB ppt_y=0BB<*%DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DI' =4@BBB B%(D' =-6B+checkerboard(across)*<3<*%D' =1:Bhidden*o3>+B#style.visibility<*%%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<* %(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*$%(D#' =4@BBBB%()?)?Dw' =.?7 BBBBBQM -0.00087 -0.0155 L -0.00087 -0.05995 *3>*B ppt_xB ppt_y=@0BBAApBBBa <* D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*+%(Df' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<**%(D' =%(Dk' =%(D-' =4@BBBB%()?)?D' =.I7 BBBBB[M 1.38889E-6 -2.59259E-6 L -0.00122 0.24144 *3>*B ppt_xB ppt_y=@0BBAApBBa 6B=<*DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*%D' =1:Bhidden*o3>+B#style.visibility<*%%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(DV' =A@BBB B0B%(D' =-6B+checkerboard(across)*<3<**D' =1:Bhidden*o3>+B#style.visibility<**%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*-%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*,%(++0+0 ++0+0 ++0+0 ++0+$0 ++0+*0 ++0+*0 ++0++0 ++0+,0 ++0+-0 +\ ;0 f^ -9(    00jC"?` ` DReorder Buffer (ROB).F     0 t  6jJ"` t  6jJ"` pt  6jJ"`p ` t  6jJ"`` P t  6jJ"`P @ t   6jJ"`@ 0 t   6jJ"`0 t   6jJ"` fF     &  `B   0D|` `   <pq  4headXB  0D| P P N   <Hu \  Ecommit to arch. state  <${3"` L,$@0 : fF Oz  O `B  0D|  <XyOz 4tail 0 # lA j? ?"` H j$@ 0   BAb k? ?"` 8 k$D 0  BAe l? ?"`j ~8 l$@ 0  BAc m? ?"`X l8 m$D0  BAf n? ?"`6 J8 n$@0z  T   , p,$@0h  s *A"`@R   BAe o? ?"` @MT  o`  0A?p50  ) 0<0 a Y%Enhancement: ROB occupancy management&& + BAT r? ?"` 8 r$D0 , BAd w? ?"` 8 w$@08   /0PZB - s *Do@ @ZB . s *Do00RB 0 s *D0RB 1 s *DoB 2 s *D0,$@0 3 <@  ThresholdB 4 s *D0",$@0B 5 s *D0,$@ 0 6 0ԙ 0 ,$0 j*Delay in retirement, hence performance hit++B 7 NDԔ2 ,$@0 8 < z,$0 KIncreased rollback distance 9 <C"? @g,$0 8detected H  0޽h ? 33AR TIMING6|7|10.2|8.4|2.7|3.5|1.6|6.8yA___PPT10YA.C|+I.DM@' = @B D@' = @BA?%,( < +O%,( < +DX ' =%(D ' =%(D' =4@BBBB%()?)?Db' =.*7 BBBBBcM -4.72222E-6 1.89683E-6 L -4.72222E-6 -0.08883 *3>*B ppt_xB ppt_y=0BBAA<*Du' =4@BBB B%()))D' =-6B'blinds(horizontal)*<3<*0D' =1:Bhidden*o3>+B#style.visibility<*0%(Dw' =4@BBB B%()))D' =1:Bvisible*o3>+B#style.visibility<*2%(D' =-6B'blinds(horizontal)*<3<*2DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*,%(D' =-6B'blinds(horizontal)*<3<*,DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*+%(D' =-6B'blinds(horizontal)*<3<*+D ' =%(DO ' =%(D ' =4@BBBB%()?)?D^' =.&7 BBBBB_M -4.72222E-6 -0.08882 L -4.72222E-6 -0.22206 *3>*B ppt_xB ppt_y=0BBAA<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(D' =-6B'blinds(horizontal)*<3<*4DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*D ' =%(Dl ' =%(D'' =4@BBBB%()?)?D{' =.C7 BBBBBUM 1.38889E-6 -0.22207 L -0.00122 -0.3486 *3>*B ppt_xB ppt_y=@0BBAApBBa 6B`΁<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*5%(D' =-6B'blinds(horizontal)*<3<*5DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*D ' =%(DR ' =%(D7' =4@BBBB%()?)?D' =.S7 BBBBBeM -3.33333E-6 -1.91765E-6 L -3.33333E-6 -0.05991 *3>*B ppt_xB ppt_y=@0BBAApBBBX<* D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*,DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*,D' =1:Bhidden*o3>+B#style.visibility<*,%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*5D' =1:Bhidden*o3>+B#style.visibility<*5%(DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*4%(D' =-6B'blinds(horizontal)*<3<*4D' =%(D~' =%(D' =4@BBBB%()?)?DP' =.7 BBBBBQM -0.00122 -0.3486 L -0.00122 -0.41522 *3>*B ppt_xB ppt_y=0BBAA<*DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =-6B'blinds(horizontal)*<3<*D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*5%(DG' =4@BBB B%(D' =1:Bvisible*o3>+B#style.visibility<*5%(D' =-6B'blinds(horizontal)*<3<*5D' =%(D3' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*7%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*8%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*9%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*6%(++0+0 ++0+60 ++0+80 ++0+90 + O <0  3=j(    0$ǜC"?` ` DReorder Buffer (ROB).F     0 t  6jJ"` t  6jJ"` pt  6jJ"`p ` t  6jJ"`` P t  6jJ"`P @ t   6jJ"`@ 0 t   6jJ"`0 t   6jJ"` fF     &  `B   0D|` `   <Μ  4headXB  0D| P P N   <8Ҝ \  Ecommit to arch. state  <ל3"` ,$@ 0 : fF Oz  Oz`B  0D|  < ۜOz 4tail 0 # lA ? ?"`     BAb ? ?"`    BAe ? ?"`    BAc ? ?"`    BAf ? ?"`j ~ z  T   ` ,$D 0h  s *A"`@R   BAe ? ?"` @MT  `  0A?p50    !# ~` P ,$@0ZB " s *DԔ0PZB # s *DԔP0`B $ 0DԔ  % <C"?Y} ,$0 5fault Fz :@   &  ,$D0ZB ' s *DjJ@@  ZB ( s *DjJ:A   ) 00 T OEnhancement: History Buffer8   @  4L 0 |z 1 <jJ"`  8 z 2 <jJ"` 8  z 3 <jJ"`  @  5 0C"?` `  >History BufferfF   6 `B 7 0D|` `  8 <L  4headfF Oz 9 p`B : 0D| ; <Oz 4tail < < `|G ,$0 < Undo changes  = 0~`PP,$0 7Performance friendly: R-stream mispredictions are rare88  H  0޽h ? 332V TIMING:|16.6|2.2|6.3|2.8|2.6|5.4|4.9h2___PPT10H2.C|+WD0' = @B D0' = @BA?%,( < +O%,( < +DY' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*!%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*&%(D ' =%(DA ' =%(D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*D' =4@BB*BB%()?)?D&' =.7 BBBBB+M 0 0 L 0 0.3331 E*3>*B ppt_xB ppt_y=0BB<*&D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*!%(D' =4@BBBB%()?)?DR' =.7 BBBBBSM -0.00399 -0.03771 L -0.00399 -0.07102 *3>*B ppt_xB ppt_y=0BBAA<* D' =4@BBBB%()?)?Db' =.*7 BBBBBcM -5.55556E-6 1.89683E-6 L -5.55556E-6 -0.02221 *3>*B ppt_xB ppt_y=0BBAA<*9D' =%(Du' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(D' =%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%()?)?DL' =.7 BBBBBMM -0.00955 0.0303 L -0.00955 0.23016 *3>*B ppt_xB ppt_y=0BBAA<*DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*<%(DP' =%(D' =%(D' =4@BBBB%()?)?DZ' =."7 BBBBB[M -5.55556E-6 -0.02221 L -5.55556E-6 0.0111 *3>*B ppt_xB ppt_y=0BBAA<*9DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*&D' =1:Bhidden*o3>+B#style.visibility<*&%(DE' =4@BBB B%(D' =-6B'blinds(horizontal)*<3<*D' =1:Bhidden*o3>+B#style.visibility<*%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*=%(+P+0+0 ++0+0 ++0+%0 ++0+%0 ++0+<0 ++0+=0 +5 &0 L D , (    <"Q~ ^ ?Main (R-stream)  <'Q7 ^ BPartial (A-stream)  H*    f  0A,?"` S   B,o"`@ 0  7V  Bh1o"`@ 0` 0  @ X   0A=? @ uf   0AF?"` sdB   <DԔB 2 dB   <DԔ0  dB  <DԔ*    0p5$ `  YCorrect Prediction (Silent)" L   #  ZB  s *DԔ0PZB  s *DԔP0`B  0DԔ   <,<_ 5faultX  0A.? ; X   0A.?  K ! <AB 3 ??"` P% 3  " <A* 4 ??"` ) 4  ' <XA 7@W  5X3 ( <E  | MBase Slipstream RecoveryXB )@ 0D  H  0޽h ? 33___PPT10i.޳ Zu$+D=' = @B +;3 '0 ph#,(    <RQ~ ^ ?Main (R-stream)  <WQ7 ^ BPartial (A-stream)  HY    f  0A,?"` S   B@\o"`@ 0  7V  B`o"`@ 0` 0  @ X  0A=? @ uf   0AF?"` sdB   <DԔB 2 dB   <DԔ0  dB   <DԔ*     0 Direct Check  # < ,$ 0 MBase Slipstream RecoveryB $@ 0D@ @,$@ 0 * 0AG?0 Q6,$D 0 + <슡`L,$0 LNeed Enhanced RecoveryB ,@ 0D P,$D0H  0޽h ? 33s: TIMING|2.3|8.7|15|6.5)___PPT10 .޳ Zu$+fDU' = @B D' = @BA?%,( < +O%,( < +D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(D3' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*"%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<**%(D' =%(Du' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*$%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*+%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*,%(++0+ ++0+0 ++0+0 ++0+0 ++0+"0 ++0+#0 ++0++0 +7 0 p`f(  `~ ` s *$`P}   x ` c $ `p  ( ` 0ĵ 0 ,$0 8Mispredicted instr. and backward slices marked unchecked9@9$ 'H ` 0޽h ? 33 & TIMING |27.7___PPT10.޳ Zu$+PQFDO' = @B D ' = @BA?%,( < +O%,( < +DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*`%(+8+0+`0 +_? 0 fh (  h ;h <Ρi ' ,$0 : Prior Work  r ,$@0B Ah@ BD>7 ,$@0B Ch BD> ,$@0B Gh BD> ,$@0B Hh BD>  ,$@0B Ih@ BD>+y ,$@0B Jh BD>Ep ,$@0B Oh <D>.E u ,$@02 Sh 6 "`pE ,$@ 0 Th <ۡ6g,$ 0 8Checkers  2 Uh 6 "`  ,$@0 Vh <@ ],$0 < Non-checkers   Xh 0`0  ECoverage Analysis  Zh 0A8?` 0` ,$@0 ]h 0A8?` ` ,$@0 ^h 0A8?g  g ,$@0 _h 0A;? #` ,$@0 `h 0A>?` p d ,$@0 ch 0AA?M,$@0 dh 0AD?B ,$@0 eh 0AD?# l,$D0 fh 0AL?n t ,$D 0H h 0޽h ? 33r.> TIMING"|4.3|19.3|8.3|8.5$.___PPT10..޳ Zu$+vhD,' = @B DC,' = @BA?%,( < +O%,( < +Db ' =%(D ' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Zh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*]h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*^h%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*;h%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*+B#style.visibility<*_h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*`h%(D' =4@BBBB%())))?D' =1:Bvisible*o3>+B#style.visibility<*fh%(D' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Sh%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*Th%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*;h%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*+B#style.visibility<*@h%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Ah%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Ch%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Gh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Hh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Oh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Ih%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Jh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*ch%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*dh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*eh%(DY' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*Vh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*Uh%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*eh%(+P+0+;h0 ++0+;h0 ++0+3    <hv p,$ 0 ;Masked? " 6o"`U@,$@0 # 6o"`p ,$@0 $ 0 0  ECoverage Analysis RB ) s *D)@ * <$0pP BRollback point - 6o"`p ,$D0 . 63o"`p ,$D0dB 6@ <D>r dB 7@ <D>7 dB 8 <D> dB : <D> dB ; <D>  dB <@ <D>+y dB = <D>Ep dB > <D>.E u X ? 0A8?` 0` X @ 0A8?` ` X A 0A8?g  g X B 0A;? #` X C 0A>?` p d X E 0AA?MX F 0AD?B X G 0AD?# l H 6o"`~N ,$@ 0 I <p0v p,$ 0 ;Masked?X K 0AL?n t H  0޽h ? 33; TIMINGf|13.2|5.4|14.3|19.2|7.9|3.2|11.8|7.7|6.2|11.4|5.6|6V;___PPT106;.޳ Zu$+M|DJ9' == @B D9' = @BA?%,( < +O%,( < +D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(DA' =%(D' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(DW' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =%(Du' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*H%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*I%(D5' =%(D' =%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*I%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*H%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*"%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*H%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<* %(D' =%(Ds' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*#%(D' =A@BBBB0B%(D' =1:Bhidden*o3>+B#style.visibility<*%(D3' =%(D' =%(D/' =4@BBBB%()?)?D' =.K7 BBBBB]M -3.33333E-6 -2.01249E-7 L -0.00416 0.21096 *3>*B ppt_xB ppt_y=@0BBAApBBB=<*)D8' =A@BBBB0B%()?)?D' =.G7 BBBBBYM 1.38889E-6 -3.60167E-6 L 0.00087 0.18876 *3>*B ppt_xB ppt_y=@0BBAApBBa 9BI=<**D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*"%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*#%(D' =%(Df' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*"%(D' =4@BBBB%(D' =1:Bhidden*o3>+B#style.visibility<*#%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*-%(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*.%(++0+0 ++0+0 ++0+0 ++0+ 0 ++0+ 0 +