Granular source read scheduling for instruction execution

A method, comprising:

• arbitrating, by a computing system, between instructions of single-instruction multiple-thread (SIMT) execution groups for access to a first operand resource category;
• arbitrating, by the computing system, between instructions of SIMT groups for access to a second operand resource category;
• sending, by the computing system down pipeline circuitry of the computing system to source access circuitry of the computing system, prior to an instruction of a first SIMT slot winning arbitration for all its operands, a source capture command in response to the instruction winning arbitration for a first operand resource;
• and
• accessing, by the source access circuitry, operand data from one or more operand resources based on the source capture command;
• and
• generating, by the computing system subsequent to the accessing, an instruction release command for the instruction, in response to the instruction winning arbitration for all its operands.

A non-transitory computer-readable medium having instructions of a hardware description programming language stored thereon that, when processed by a computing system, program the computing system to generate a computer simulation model, wherein the model represents a hardware circuit that includes:

• processor pipeline circuitry;
• multiple first and second categories of operand resource circuits configured to provide operand data for instructions to be executed by the processor pipeline circuitry;
• wherein the processor pipeline circuitry includes:
• first resource arbitration circuitry configured to arbitrate between instructions of single-instruction multiple-thread (SIMT) groups for access to the first operand resource category;
• second resource arbitration circuitry configured to arbitrate between SIMT groups for access to the second operand resource category;
• source access circuitry configured to access the operand data from the operand resources based on source capture commands;
• and
• source control circuitry configured to, prior to an instruction of a first SIMT group winning arbitration for all its operands and in response the instruction winning arbitration at the first resource arbitration circuitry for a first operand resource of the operand resource circuits, send a source capture command to the source access circuitry to access operand data from the first operand resource for the instruction;
• and
• instruction control circuitry configured to generate an instruction release command for the instruction first SIMT group, in response to the instruction winning arbitration for all its operands, including at the second resource arbitration circuitry.