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De-aliased Hybrid Branch Predictors

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HAL Id: inria-00073060

https://hal.inria.fr/inria-00073060

Submitted on 24 May 2006

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De-aliased Hybrid Branch Predictors

André Seznec, Pierre Michaud

To cite this version:

André Seznec, Pierre Michaud. De-aliased Hybrid Branch Predictors. [Research Report] RR-3618,

INRIA. 1999. �inria-00073060�

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ISSN 0249-6399

a p p o r t

d e r e c h e r c h e

INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE

De-aliased Hybrid Branch Predictors

Andr´e Seznec, Pierre Michaud

N ˚ 3618

F´evrier 1999

TH ` EME 1

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(12)

address address

n

bimodal prediction

n

e-gskew prediction

n

PREDICTION

majority vote

history

metaprediction n

BIM

G0

G1

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(13)

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(14)

3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

QD„ Ñ Q6‚

5 5.5 6 6.5 7 7.5 8 8.5 9

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

Í Q … Î P„ Ñ

6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

3 3.5 4 4.5 5 5.5

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

„ Í … QD‡3‡ ‚JÒ Í ƒ

3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12

% misprediction

global history length e-gsk 3*4K gshare 32K 2Bc-gskew 4*2K 2Bc-gshare 16K YAGS 2K + 2*1K

Í

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R$#&%('*)

(15)

2 2.5 3 3.5 4 4.5 5

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

QD„ Ñ Q6‚

4.5 5 5.5 6 6.5 7 7.5 8 8.5 9

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2 2.5 3 3.5 4 4.5

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

Í Q … Î P„ Ñ

4 5 6 7 8 9 10 11

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2.5 3 3.5 4 4.5 5

0 2 4 6 8 10 12 14

% misprediction

global history length e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

„ Í … QD‡3‡ ‚JÒ Í ƒ

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12 14

% misprediction

e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

0 2 4 6 8 10 12 14

% misprediction

e-gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

USV7WKUYX

(16)

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#

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R$#&%('*)

(17)

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

3 3.5 4 4.5 5 5.5 6 6.5 7

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

QD„ Ñ Q6‚

4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2 2.5 3 3.5 4 4.5 5 5.5

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

Í Q … Î P„ Ñ

5 6 7 8 9 10 11

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2 3 4 5 6 7 8

1 3 5 7 9 inf

% misprediction

Branch quantum (x 50,000) gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

„ Í … QD‡3‡ ‚JÒ Í ƒ

2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5

1 3 5 7 9 inf

% misprediction

gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

2 3 4 5 6 7 8 9

1 3 5 7 9 inf

% misprediction

gskew 48K gshare 128K 2Bc-gskew 32K 2Bc-gshare 64K YAGS 8K + 2*4K

USV7WKUYX

(18)

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Unit´e de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES Cedex Unit´e de recherche INRIA Rhˆone-Alpes, 655 avenue de l’Europe, 38330 MONTBONNOT ST

Unit´e de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES Cedex Unit´e de recherche INRIA Rhˆone-Alpes, 655, avenue de l’Europe, 38330 MONTBONNOT ST

Unit´e de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES Cedex Unit´e de recherche INRIA Rhˆone-Alpes, 655, avenue de l’Europe, 38330 MONTBONNOT ST

Unit´e de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES Cedex Unit´e de recherche INRIA Rhˆone-Alpes, 655, avenue de l’Europe, 38330 MONTBONNOT ST