Granular source read scheduling for instruction execution

Abstract

Techniques are disclosed relating to accessing source data in single-instruction multiple-thread (SIMT) pipelines. In some embodiments, multiple categories of operand resource circuits are configured to provide operands for instructions executed by processor pipeline circuitry. Per-resource arbitration circuitry may arbitrate between the SIMT execution slots for access to different operand resources. Source access circuitry may access operand data from operand resources based on source capture commands and source control circuitry may prior to a first SIMT group winning arbitration for all its operands, send a source capture command to the source access circuitry in response to the first SIMT group winning arbitration at the per-resource arbitration circuitry for a first operand resource. Instruction control circuitry may send an instruction release command down the processor pipeline circuitry for the first SIMT group, in response to the first SIMT group winning arbitration for all its operands.