Method, apparatus and instructions for parallel data conversions

• US 9,952,873 B2
• Filed: 06/30/2017
• Issued: 04/24/2018
• Est. Priority Date: 09/08/2003
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Ramanujam, Gopalan
• Primary Examiner(s): Mai, Tan V.
• Application Number:
  US15/639,523
• Publication Number:
  US 20170300335A1
• Time in Patent Office: 298 Days
• Field of Search: 708204, 708550-553
• CPC Class Codes: G06F 15/82 data or demand driven
• CPC Class Codes: G06F 7/48 using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
• CPC Class Codes: G06F 9/30014 with variable precision
• CPC Class Codes: G06F 9/30025 Format conversion instructions, e.g. Floating-Point to Integer, decimal conversion
• CPC Class Codes: G06F 9/30032 Movement instructions, e.g. MOVE, SHIFT, ROTATE, SHUFFLE
• CPC Class Codes: G06F 9/30036 Instructions to perform operations on packed data, e.g. vector, tile or matrix operations
• CPC Class Codes: G06F 9/30109 having multiple operands in a single register
• CPC Class Codes: G06F 9/30145 Instruction analysis, e.g. decoding, instruction word fields
• CPC Class Codes: G06F 9/3016 Decoding the operand specifier, e.g. specifier format
• CPC Class Codes: G06F 9/3836 Instruction issuing, e.g. dynamic instruction scheduling or out of order instruction execution
• CPC Class Codes: G06F 9/384 Register renaming

Abstract

Method, apparatus, and program means for performing a conversion. In one embodiment, a disclosed apparatus includes a destination storage location corresponding to a first architectural register. A functional unit operates responsive to a control signal, to convert a first packed first format value selected from a set of packed first format values into a plurality of second format values. Each of the first format values has a plurality of sub elements having a first number of bits The second format values have a greater number of bits. The functional unit stores the plurality of second format values into an architectural register.

Claims

1. A processor comprising:

a register file including a first packed data register and a second packed data register;

register renaming circuitry to perform renaming of physical registers within the register file;

a decoder to decode an instruction;

scheduling circuitry to queue operations corresponding to the instruction for execution; and

execution circuitry to execute the operations corresponding to the instruction to convert a plurality of first packed floating point data elements from the first packed data register to a plurality of packed integer results, to truncate the packed integer results, and to store the packed integer results in the second packed data register,

each of the first packed floating point data elements having a first number of bits, each of the packed integer results having a second number of bits, wherein the second number of bits is one half the first number of bits.

2. The processor of claim 1, wherein the operations comprise micro-operations generated by the decoder upon decoding the instruction.

3. The processor of claim 1, wherein the register renaming circuitry is to perform renaming to associate a first physical register from the register file with the first packed data register and to associate a second physical register from the register file with the second packed data register.

4. The processor of claim 3, wherein the first packed data register and second packed data register comprise XMM or YMM registers.

5. A processor comprising:

a register file including a first packed data register and a second packed data register;

register renaming circuitry to perform renaming of physical registers within the register file;

a decoder to decode an instruction, the instruction specifying one or more operations;

scheduling circuitry to queue the one or more operations for execution; and

execution circuitry to execute the one or more operations to convert a plurality of first packed floating point data elements from the first packed data register to a plurality of packed integer results, to truncate the packed integer results, and to store the packed integer results in the second packed data register,

each of the first packed floating point data elements having a first number of bits, each of the packed integer results having a second number of bits, wherein the second number of bits is one half the first number of bits.

6. The processor of claim 5, wherein the operations comprise micro-operations generated by the decoder upon decoding the instruction.

7. The processor of claim 5, wherein the register renaming circuitry is to perform renaming to associate a first physical register from the register file with the first packed data register and to associate a second physical register from the register file with the second packed data register.

8. The processor of claim 7, wherein the first packed data register and second packed data register comprise XMM or YMM registers.

9. A machine-readable medium having program code stored thereon which, when executed by a machine, causes the machine to perform the operations of:

renaming physical registers within a register file including a first packed data register and a second packed data register;

decoding an instruction specifying one or more operations;

scheduling the one or more operations for execution; and

executing the one or more operations to convert a plurality of first packed floating point data elements from the first packed data register to a plurality of packed integer results, to truncate the packed integer results, and to store the packed integer results in the second packed data register, each of the first packed floating point data elements having a first number of bits,

each of the packed integer results having a second number of bits, wherein the second number of bits is one half the first number of bits.

10. The machine-readable medium of claim 9, wherein the operations comprise micro-operations generated by the decoder upon decoding the instruction.

11. The machine-readable medium of claim 9, wherein renaming comprises associating a first physical register from the register file with the first packed data register and associating a second physical register from the register file with the second packed data register.

12. The machine-readable medium of claim 11, wherein the first packed data register and second packed data register comprise XMM or YMM registers.

13. An apparatus comprising:

means for renaming physical registers within a register file including a first packed data register and a second packed data register;

means for decoding an instruction specifying one or more operations;

means for scheduling the one or more operations for execution; and

means for executing the one or more operations to convert a plurality of first packed floating point data elements from the first packed data register to a plurality of packed integer results, to truncate the packed integer results, and to store the packed integer results in the second packed data register,

each of the first packed floating point data elements having a first number of bits, each of the packed integer results having a second number of bits, wherein the second number of bits is one half the first number of bits.

14. The apparatus of claim 13, wherein the operations comprise micro-operations generated by the decoder upon decoding the instruction.

15. The apparatus of claim 13, wherein means for renaming is to perform renaming to associate a first physical register from the register file with the first packed data register and to associate a second physical register from the register file with the second packed data register.

16. The apparatus of claim 15, wherein the first packed data register and second packed data register comprise XMM or YMM registers.

17. A system comprising:

at least one processor;

a system memory to store instructions to be processed by the at least one processor;

a memory controller to communicatively couple the at least one processor to the system memory over a system memory bus;

the at least one processor comprising;

a register file including a first packed data register and a second packed data register;

register renaming circuitry to perform renaming of physical registers within the register file;

a decoder to decode an instruction, the instruction specifying one or more operations;

scheduling circuitry to queue the one or more operations for execution; and

execution circuitry to execute the one or more operations to convert a plurality of first packed floating point data elements from the first packed data register to a plurality of packed integer results, to truncate the packed integer results, and to store the packed integer results in the second packed data register,

each of the first packed floating point data elements having a first number of bits, each of the packed integer results having a second number of bits, wherein the second number of bits is one half the first number of bits.

18. The system of claim 17, further comprising:

a network interface to communicatively couple the processor to a network.

19. The system of claim 17, wherein the operations comprise micro-operations generated by the decoder upon decoding the instruction.

20. The system of claim 17, wherein the register renaming circuitry is to perform renaming to associate a first physical register from the register file with the first packed data register and to associate a second physical register from the register file with the second packed data register.

21. The system of claim 20, wherein the first packed data register and second packed data register comprise XMM or YMM registers.