Apparatus for generating return address predictions for...

G - Physics – 06 – F

Patent

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G06F 9/30 (2006.01) G06F 9/32 (2006.01) G06F 9/38 (2006.01)

Patent

CA 2659384

An apparatus for emulating the branch prediction behavior of an explicit subroutine call is disclosed. The apparatus includes a first input which is configured to receive an instruction address and a second input. The second input is configured to receive predecode information which describes the instruction address as being related to an implicit subroutine call to a subroutine. In response to the predecode information, the apparatus also includes an adder configured to add a constant to the instruction address defining a return address, causing the return address to be stored to an explicit subroutine resource, thus, facilitating subsequent branch prediction of a return call instruction.

L'invention concerne un appareil destiné à l'émulation du comportement de prédiction de branchement d'un appel de sous-programme explicite. L'appareil comprend une première entrée configurée pour recevoir une adresse d'instruction et une seconde entrée. La seconde entrée est conçue pour recevoir des informations de pré-décodage décrivant l'adresse d'instruction en relation avec un appel de sous-programme implicite à un sous-programme. En réponse à ces informations de pré-décodage, l'appareil inclut également un additionneur configuré pour ajouter une constante à l'adresse d'instruction définissant une adresse de retour, cette dernière étant stockée dans une ressource de sous-programme explicite, ce qui facilite la prédiction de branchement subséquente d'une instruction d'appel de retour.

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