摘要:
A computer architecture to process load instructions by allowing multiple mappings between logical registers and the same physical register is disclosed. The computer architecture includes a processor having a physical registers. The processor also includes a decoder to decode a load instruction that names a destination logical register. The processor also includes a register allocation table to map the destination logical register to a physical register within the plurality of physical registers. If the load instruction is predicted to collide with a prior load instruction that names a destination logical register, then the register allocation table maps the destination logical register to the physical register allocated to the first load instruction.
摘要:
A multi-mode predictor for a processor having a plurality of prediction modes is disclosed. The prediction modes are used to predict non-binary values. The predictor is a multi-mode predictor comprising a per-IP (“PIP”) table and a next value table. The PIP table includes a plurality of PIP information fields and the next value table includes a plurality of fields. The multi-mode predictor also includes a plurality of prediction modes. The processor includes a set of instructions that index the PIP table to provide a valid signal. The processor also includes a set of predicted values for the set of instructions. The set of predicted values is stored in the PIP table and the next value table. According to the valid signal a hit/miss condition in the next value table, a predicted value is selected from the PIP table or the next value table.
摘要:
Apparatus and methods to filter memory record updates. A microprocessor can include a memory record update filter. The memory record update filter can include a table memory populated by a plurality of data entries. Each data entry can include a data tag field to store a data tag, a data field to store a data value, and a filter field to store a filter value. A first comparator can be in communication with the data tag field of the table memory and a data accessing information input to perform a data tag comparison. A second comparator can be in communication with the filter field of the table memory and a data value input. A control circuit can be in communication with the table memory, the first comparator, and the second comparator.
摘要:
Apparatus and methods to track a register value. A microprocessor can include a first register, a control circuit, and an adder. The first register can store a tracked register value. The control circuit can include an instruction input to receive at least a portion of an instruction and a first output to output an arithmetic operation indication. The adder can include a control input to receive the arithmetic operation indication, a first input to receive an immediate operand of an instruction, and a second input to receive the tracked register value.
摘要:
Apparatus and methods to filter memory record updates. A microprocessor can include a memory record update filter. The memory record update filter can include a table memory populated by a plurality of data entries. Each data entry can include a data tag field to store a data tag, a data field to store a data value, and a filter field to store a filter value. A first comparator can be in communication with the data tag field of the table memory and a data accessing information input to perform a data tag comparison. A second comparator can be in communication with the filter field of the table memory and a data value input. A control circuit can be in communication with the table memory, the first comparator, and the second comparator.
摘要:
A microprocessor having a correlated address predictor, and methods of performing correlated address prediction. A first table memory can be populated by a plurality of buffer entries. Each buffer entry can include a first buffer field to store a first tag based on an instruction pointer and a second buffer field to store an address history. A second table memory can be populated by a plurality of link entries. Each link entry can include a first link field to store a link tag based on an address history and a second link field to store a predicted address. A first comparator can be in communication with the first table memory and an instruction pointer input. A second comparator can be in communication with the first table memory and the second table memory. An output in communication with the second table memory.
摘要:
In an enhanced virtual renaming scheme within a processor, multiple logical registers may be mapped to a single physical register. A value cache determines whether a new value generated pursuant to program instructions matches values associated with previously executed instructions. If so, the logical register associated with the newly executed instruction shares the physical register. Also, deadlock preventatives measures may be integrated into a register allocation unit in a manner that “steals” a physical register from a younger executed instruction when a value from an older instruction is generated-in a processor core.
摘要:
A processor having a register renaming structure and method is disclosed to recover a free list. The processor includes a physical register file including physical registers. The processor also includes a decoder to decode an instruction to indicate a destination logical register. The processor also includes a register allocation table to map the destination logical register to an allocated physical register. The processor also includes an active list that includes an old field and a new field. The old field includes at least one evicted physical register from the register alias table. The new field includes the allocated physical register. The processor also includes the free list of unallocated physical registers reclaimed from the active list.
摘要:
Apparatus and methods to track a register value. A microprocessor can include a first register, a control circuit, and an adder. The first register can store a tracked register value. The control circuit can include an instruction input to receive at least a portion of an instruction and a first output to output an arithmetic operation indication. The adder can include a control input to receive the arithmetic operation indication, a first input to receive an immediate operand of an instruction, and a second input to receive the tracked register value.
摘要:
In an enhanced virtual renaming scheme within a processor, multiple logical registers may be mapped to a single physical register. A value cache determines whether a new value generated pursuant to program instructions matches values associated with previously executed instructions. If so, the logical register associated with the newly executed instruction shares the physical register. Also, deadlock preventatives measures may be integrated into a register allocation unit in a manner that “steals” a physical register from a younger executed instruction when a value from an older instruction is generated in a processor core.