Abstract:
A method and apparatus for providing, in a processor, a shift operation on a packed data element having multiple values. One embodiment of a central processing unit (CPU) includes instruction fetch logic to fetch a single-instruction-multiple-data (SIMD) shift instruction. A register stores a multiple data elements to be operated upon by the SIMD shift instruction. A barrel shifter concurrently shifts the data elements in a bit-wise manner by a variable number of bit positions in response to the SIMD shift instruction.
Abstract:
A computer-implemented method for code optimization includes collecting a profile of execution of an application program, which includes a target module, which calls one or more functions in a source module. The source and target modules may be independently-linked object files. Responsively to the profile, at least one function from the source module is identified and cloned to the target module, thereby generating an expanded target module. The expended target module is restructured so as to optimize the execution of the application program.
Abstract:
An apparatus includes an instruction decoder, first and second source registers and a circuit coupled to the decoder to receive packed data from the source registers and to pack the packed data responsive to a pack instruction received by the decoder. A first packed data element and a second packed data element are received from the first source register. A third packed data element and a fourth packed data element are received from the second source register. The circuit packs packing a portion of each of the packed data elements into a destination register resulting with the portion from second packed data element adjacent to the portion from the first packed data element, and the portion from the fourth packed data element adjacent to the portion from the third packed data element.
Abstract:
A method and apparatus for providing, in a processor, a shift operation on a packed data element having multiple values. The apparatus having multiple muxes, each of the multiple muxes having a first input, a second input, a select input and an output. Each of the multiple bits that represent a shifted packed intermediate result on a first bus is coupled to the corresponding first input. Each of the multiple bits representing a replacement bit for one of the multiple values is coupled to a corresponding second input. Each of the multiple bits driven by a correction circuit is coupled to a corresponding select input. Each output corresponds to a bit of a shifted packed result.
Abstract:
A method and apparatus for providing, in a processor, a shift operation on a packed data element having multiple values. The apparatus having multiple muxes, each of the multiple muxes having a first input, a second input, a select input and an output. Each of the multiple bits that represent a shifted packed intermediate result on a first bus is coupled to the corresponding first input. Each of the multiple bits representing a replacement bit for one of the multiple values is coupled to a corresponding second input. Each of the multiple bits driven by a correction circuit is coupled to a corresponding select input. Each output corresponds to a bit of a shifted packed result.
Abstract:
An apparatus for performing a shift operation on a packed data element having multiple values. The apparatus having multiple muxes, each of the multiple muxes having a first input, a second input, a select input and an output. Each of the multiple bits that represent a shifted packed intermediate result on a first bus is coupled to the corresponding first input. Each of the multiple bits representing a replacement bit for one of the multiple values is coupled to a corresponding second input. Each of the multiple bits driven by a correction circuit is coupled to a corresponding select input. Each output corresponds to a bit of a shifted packed result.
Abstract:
A method for manipulating packed data in a computer system. The method includes the steps of decoding a Single Instruction Multiple Data (SIMD) pack instruction. The instruction identifies a first and second packed data respectively including a first plurality of data elements and a second plurality of data elements. Each data element consists of a separate multiple bit data field, wherein each data element in the first plurality of data elements corresponds to a data element in the second plurality of data elements in a respective position. The method further includes the step of simultaneously copying, in response to the pack instruction, a part of each data element in the first plurality of data elements and a part of each corresponding data element in the second plurality of data elements into a third packed data as a plurality of separate result data elements.