Motorola Corporation

Mark Elnekave

Yoram Salant

Leonid Tsukerman

Fabrice Aidan

A method and a device for performing stack operations within a processing system. A first and second stack pointers point to a top of a stack and to a memory location following the top of the stack. A first stack pointer is used during pop operations and a second stack pointer is used during push operations. When a stack pointer is selected, it replaces the other stack pointer. The selected memory pointer is provided to a memory module in which a stack is implemented, and is also updated. When a pop operation is executed the updated stack pointer points to a memory location preceding a memory location pointed by the selected stack pointer and when a push operation is executed the updated stack pointer points to a memory address following that address.

Device and a method for performing stack operations in a processing system

A power saving device and method for either adding or subtracting a constant from an operand, by checking a logic value of a portion of the operand and deciding whether to activate a multi-bit adder or to perform the subtraction or addition by inverting a portion of the operand. The power saving device and method is especially efficient when the constant K equals 2 . Then, the n'th bit of the operand is checked and if the addition or subtraction operation can be performed by inverting the n'th bit of the operand, a result is generated by that inversion, while a multi-bit adder is disabled.

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Ramat Gan, Israel

Mark Elnekave