Multiple register memory access instructions, processors, methods, and systems
A processor includes N-bit registers and a decode unit to receive a multiple register memory access instruction. The multiple register memory access instruction is to indicate a memory location and a register. The processor includes a memory access unit coupled with the decode unit and with the N-bit registers. The memory access unit is to perform a multiple register memory access operation in response to the multiple register memory access instruction. The operation is to involve N-bit data, in each of the N-bit registers comprising the indicated register. The operation is also to involve different corresponding N-bit portions of an M×N-bit line of memory corresponding to the indicated memory location. A total number of bits of the N-bit data in the N-bit registers to be involved in the multiple register memory access operation is to amount to at least half of the M×N-bits of the line of memory.
1. A system comprising:
a system memory; and
a processor coupled to the system memory, the processor comprising:
a cache to store a plurality of cache lines;
a plurality of general purpose registers;
a plurality of 128-bit packed data registers, including a first destination 128-bit packed data register, and a second destination 128-bit packed data register;
an instruction fetch unit to fetch instructions, including a load from memory instruction;
a decode unit to decode the load from memory instruction, the load from memory instruction indicating a starting memory location in a memory, the starting memory location associated with data to be loaded, and the load from memory instruction having a first field to specify the first destination 128-bit packed data register, and having a second field to specify the second destination 128-bit packed data register; and
a memory access unit coupled to the decode unit, and coupled to the plurality of 128-bit packed data registers, the memory access unit to perform a load from memory operation in response to the decoded load from memory instruction, the load from memory operation to:
load a first 128-bit data from the indicated starting memory location, and store the loaded first 128-bit data in the first destination 128-bit packed data register; and
load a second 128-bit data, which is adjacent to the first 128-bit data, and store the loaded second 128-bit data in the second destination 128-bit packed data register.
2. The system of claim 1 , further comprising a plurality of write mask registers to predicate result vector writes.
3. The system of claim 1 , further comprising a 16-wide vector processing unit to execute double-precision float instructions.
4. The system of claim 1 , wherein the cache is to store 512-bit cache lines.
5. The system of claim 1 , wherein the cache is to store 1024-bit cache lines.
6. The system of claim 1 , wherein the cache is to store cache lines that are a multiple of a width of the 128-bit packed data registers.
7. The system of claim 1 , further comprising:
a branch prediction unit; and
a translation lookaside buffer (TLB).
8. The system of claim 1 , wherein the processor is a reduced instruction set computing (RISC) processor.
9. The system of claim 1 , further comprising audio I/O coupled to the processor.
10. The system of claim 1 , further comprising a communication device coupled to the processor.
11. The system of claim 1 , further comprising an I/O device coupled to the processor.
12. The system of claim 1 , further comprising a mass storage device coupled to the processor.
13. The system of claim 12 , wherein the mass storage device comprises a disk drive.
14. The system of claim 1 , further comprising a Peripheral Component Interconnect (PCI) Express bus coupled to the processor.
15. The system of claim 1 , further comprising a graphics processor coupled to the processor.
16. The system of claim 1 , wherein the system memory comprises dynamic random access memory (DRAM).
17. A method performed by a system, the method comprising:
storing data in a system memory;
storing a plurality of cache lines in a cache of a processor of the system;
storing data in a plurality of general purpose registers of the processor;
fetching a load from memory instruction with an instruction fetch unit of the processor;
decoding the load from memory instruction with a decode unit of the processor, the load from memory instruction indicating a starting memory location in a memory, the starting memory location associated with data to be loaded, and the load from memory instruction having a first field specifying a first destination 128-bit packed data register of the processor, and having a second field specifying a second destination 128-bit packed data register of the processor; and
performing a load from memory operation, in response to the decoded load from memory instruction, the load from memory operation including:
loading a first 128-bit data from the indicated starting memory location, and store the loaded first 128-bit data in the first destination 128-bit packed data register; and
loading a second 128-bit data, which is adjacent to the first 128-bit data, and store the loaded second 128-bit data in the second destination 128-bit packed data register.
18. The method of claim 17 , further comprising transmitting data on a Peripheral Component Interconnect (PCI) Express bus coupled to the processor.
19. An article of manufacture comprising a non-transitory machine-readable storage medium, the non-transitory machine-readable storage medium storing a set of instructions, including a load from memory instruction, the set of instructions if processed by a system to cause the system to perform operations comprising to:
store data in a system memory;
store a plurality of cache lines in a cache of a processor of the system;
store data in a plurality of general purpose registers of the processor;
the load from memory instruction if processed by the system to cause the system to perform operations comprising to:
decode the load from memory instruction with a decode unit of the processor, the load from memory instruction to indicate a starting memory location in a memory, the starting memory location associated with data to be loaded, and the load from memory instruction having a first field to specify a first destination 128-bit packed data register of the processor, and having a second field to specify a second destination 128-bit packed data register of the processor; and
perform a load from memory operation, in response to the decoded load from memory instruction, the load from memory operation including:
loading a first 128-bit data from the indicated starting memory location, and store the loaded first 128-bit data in a first destination 128-bit packed data register of the processor; and
loading a second 128-bit data, which is adjacent to the first 128-bit data, and store the loaded second 128-bit data in a second destination 128-bit packed data register of the processor.
20. The article of manufacture of claim 19 , wherein the set of instructions, if processed by the system, are to cause the system to perform operations comprising to transmit data on a Peripheral Component Interconnect (PCI) Express bus.