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1. (WO2018044333) BRANCH TARGET BUFFER COMPRESSION
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Pub. No.: WO/2018/044333 International Application No.: PCT/US2016/051527
Publication Date: 08.03.2018 International Filing Date: 13.09.2016
IPC:
G06F 9/38 (2006.01)
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
9
Arrangements for programme control, e.g. control unit
06
using stored programme, i.e. using internal store of processing equipment to receive and retain programme
30
Arrangements for executing machine- instructions, e.g. instruction decode
38
Concurrent instruction execution, e.g. pipeline, look ahead
Applicants: ADVANCED MICRO DEVICES, INC.[US/US]; 2485 Augustine Drive Santa Clara, CA 95054, US
Inventors: HAVLIR, Steven R.; US
Agent: GUSHUE, Joseph P.; US
Priority Data:
15/252,16430.08.2016US
Title (EN) BRANCH TARGET BUFFER COMPRESSION
(FR) COMPRESSION DE TAMPON CIBLE DE BRANCHEMENT
Abstract:
(EN) Techniques for improving branch target buffer ("BTB") operation. A compressed BTB is included within a branch prediction unit along with an uncompressed BTB. To support prediction of up to two branch instructions per cycle, the uncompressed BTB includes entries that each store data for up to two branch predictions. The compressed BTB includes entries that store data for only a single branch instruction for situations where storing that single branch instruction in the uncompressed BTB would waste space in that buffer. Space would be wasted in the uncompressed BTB due to the fact that, in order to support two branch lookups per cycle, prediction data for two branches must have certain features in common (such as cache line address) in order to be stored together in a single entry.
(FR) L'invention concerne des techniques permettant d'améliorer le fonctionnement d'un tampon cible de branchement ("BTB"). Un BTB compressé est inclus dans une unité de prédiction de branchement conjointement avec un BTB non compressé. Pour prendre en charge la prédiction de jusqu'à deux instructions de branchement par cycle, le BTB non compressé comprend des entrées qui stockent chacune des données pour jusqu'à deux prédictions de branchement. Le BTB compressé comprend des entrées qui stockent des données pour seulement une instruction de branchement unique concernant des situations où le stockage de cette instruction de branchement unique dans le BTB non compressé conduirait à une perte d'espace dans ce tampon. L'espace serait perdu dans le BTB non compressé en raison du fait que, afin de prendre en charge deux recherches de branchements par cycle, des données de prédiction pour deux branchements doivent avoir certaines caractéristiques en commun (telle qu'une adresse de ligne de mémoire cache) afin d'être stockées ensemble dans une seule entrée.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)