COALESCING ADJACENT GATHER/SCATTER OPERATIONS

摘要

According to one embodiment, a processor includes an instruction decoder to decode a first instruction to gather data elements from memory, the first instruction having a first operand specifying a first storage location and a second operand specifying a first memory address storing a plurality of data elements. The processor further includes an execution unit coupled to the instruction decoder, in response to the first instruction, to read contiguous a first and a second of the data elements from a memory location based on the first memory address indicated by the second operand, and to store the first data element in a first entry of the first storage location and a second data element in a second entry of a second storage location corresponding to the first entry of the first storage location.

主权项

1. A server comprising:
a Peripheral Component Interconnect Express (PCIe) interface of the server; and a processor of the server, the processor comprising: a plurality of 64-bit general-purpose registers; a plurality of 128-bit single instruction, multiple data (SIMD) registers; a data cache; an instruction cache; a level 2 (L2) cache coupled to the data cache and coupled to the instruction cache; a branch prediction unit; an instruction translation lookaside buffer (TLB) coupled to the instruction cache; an instruction fetch unit; a decode unit coupled to the instruction fetch unit, the decode unit to decode a plurality of instructions, including a first instruction, the first instruction to indicate a 128-bit operand size, the first instruction having a first field to specify a first 128-bit SIMD destination register of the plurality of 128-bit SIMD registers, the first instruction having a second field to specify a 64-bit general-purpose register of the plurality of 64-bit general-purpose registers to store a base address, and the first instruction to indicate a data element width of 64-bits; and an execution unit coupled to the decode unit, coupled to the plurality of 128-bit SIMD registers, and coupled to the plurality of 64-bit general-purpose registers, the execution unit to: load a first structure and a second structure from a memory based on the base address, the first structure to include a first 64-bit data element, a second 64-bit data element, and a third 64-bit data element, the second structure to include a first 64-bit data element, a second 64-bit data element, and a third 64-bit data element, wherein the first 64-bit data element, the second 64-bit data element, and the third 64-bit data element of the first structure are to be consecutive elements in the memory, and wherein the first 64-bit data element, the second 64-bit data element, and the third 64-bit data element of the second structure are to be consecutive elements in the memory; and store the first 64-bit data element of the first structure as a first 64-bit data element of the first 128-bit SIMD destination register, the second 64-bit data element of the first structure as a first 64-bit data element of a second 128-bit SIMD destination register, the third 64-bit data element of the first structure as a first 64-bit data element of a third 128-bit SIMD destination register, the first 64-bit data element of the second structure as a second 64-bit data element of the first 128-bit SIMD destination register, the second 64-bit data element of the second structure as a second 64-bit data element of the second 128-bit SIMD destination register, and the third 64-bit data element of the second structure as a second 64-bit data element of the third 128-bit SIMD destination register, wherein the first 64-bit data element of the first 128-bit SIMD destination register is to include least significant bits of the first 128-bit SIMD destination register, wherein the first 64-bit data element of the second 128-bit SIMD destination register is to include least significant bits of the second 128-bit SIMD destination register, and wherein the first 64-bit data element of the third 128-bit SIMD destination register is to include least significant bits of the third 128-bit SIMD destination register.