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 on a chip (SoC) comprising:
an integrated memory controller; and
a processor coupled to the integrated memory controller, 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 SoC of claim 1 , further comprising a plurality of write mask registers to predicate result vector writes.
3. The SoC of claim 1 , further comprising a 16-wide vector processing unit to execute double-precision float instructions.
4. The SoC of claim 1 , wherein the cache is to store 512-bit cache lines.
5. The SoC of claim 1 , wherein the cache is to store 1024-bit cache lines.
6. The SoC 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 SoC of claim 1 , further comprising:
a branch prediction unit; and
a translation lookaside buffer (TLB).
8. The SoC of claim 1 , wherein the processor is a reduced instruction set computing (RISC) processor.
9. The SoC of claim 1 , further comprising a communication processor coupled to the processor.
10. The SoC of claim 1 , further comprising a network processor coupled to the processor.
11. The SoC of claim 1 , further comprising an image processor coupled to the processor.
12. The SoC of claim 1 , further comprising a display unit coupled to the processor, the display unit to couple an external display.
13. The SoC of claim 1 , further comprising a graphics processing unit coupled to the processor.
14. The SoC of claim 1 , further comprising an audio processor coupled to the processor.
15. The SoC of claim 1 , further comprising an interconnect coupled to the processor and the integrated memory controller.
16. The SoC of claim 15 , wherein the interconnect comprises a ring interconnect.
17. The SoC of claim 1 , further comprising a direct memory access (DMA) unit coupled to the processor.
18. The SoC of claim 1 , further comprising a coprocessor coupled to the processor.
19. A method performed by a system on a chip (SoC), the method comprising:
loading a plurality of cache lines from a memory with an integrated memory controller of the SoC;
storing the plurality of cache lines in a cache of a processor of the SoC;
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 storing 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 storing the loaded second 128-bit data in the second destination 128-bit packed data register.
20. 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 on a chip (SoC) to cause the SoC to perform operations comprising to:
load a plurality of cache lines from a memory with an integrated memory controller of the SoC;
store the plurality of cache lines in a cache of a processor of the SoC;
store data in a plurality of general purpose registers of the processor;
the load from memory instruction if processed by the SoC to cause the SoC 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 the 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 storing 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 storing the loaded second 128-bit data in a second destination 128-bit packed data register of the processor.