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LEZIONE #05 del 12-Mag-2008 (2 ore) - Dipartimento di Ingegneria ...

LEZIONE #05 del 12-Mag-2008 (2 ore) - Dipartimento di Ingegneria ...

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Uso <strong>del</strong> pre<strong>di</strong>tt<strong>ore</strong> Globale rispetto a Locale<br />

li<br />

eqntott<br />

espresso<br />

gcc<br />

fpppp<br />

spice<br />

doduc<br />

tomcatv<br />

matrix300<br />

nasa7<br />

Roberto Giorgi, Universita’ <strong>di</strong> Siena, C208L05, Slide 25<br />

Fraction of pre<strong>di</strong>ctions by local pre<strong>di</strong>ctor<br />

37<br />

0 10 20 30 40 50 60 70 80 90 100<br />

Percentuale <strong>di</strong> branch predetti dal local pre<strong>di</strong>ctor<br />

Numero <strong>di</strong> pre<strong>di</strong>zioni <strong>del</strong> pre<strong>di</strong>tt<strong>ore</strong> locale, normalizzato rispetto<br />

al numero totale <strong>di</strong> pre<strong>di</strong>zioni (locali+globali)<br />

Grafico da [Hennessy02]<br />

Prestazioni dei pre<strong>di</strong>ttori – A BP<br />

tomcatv<br />

doduc<br />

fpppp<br />

li<br />

espresso<br />

gcc<br />

Grafico da [Hennessy02]<br />

Roberto Giorgi, Universita’ <strong>di</strong> Siena, C208L05, Slide 26<br />

55<br />

70%<br />

63<br />

77%<br />

69<br />

84%<br />

72<br />

86%<br />

82%<br />

88%<br />

86%<br />

82%<br />

88%<br />

76<br />

95%<br />

94%<br />

99%<br />

99%<br />

100%<br />

97%<br />

98%<br />

98%<br />

96%<br />

0% 20% 40% 60% 80% 100%<br />

Branch pre<strong>di</strong>ction accuracy<br />

90<br />

94<br />

98<br />

100<br />

Profile-based<br />

2-bit counter<br />

Tournament

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