Enhanced performance-aware instruction scheduling

A processor unit comprising multiple execution units, wherein the processor unit contains a dependency cache comprising instructions associated with respective execution unit indicators, the processor unit being configured for:

• tracking dependent instructions currently assigned to each respective execution unit of the processor;
• in response to receiving an instruction of a dependency chain, identifying in the dependency cache the execution unit assigned to a previous instruction of the dependency chain on which the received instruction depends;
• and
• in case more than a predefined maximum number of dependent instructions of at least one dependent chain currently assigned to the identified execution unit, selecting another execution unit of the processor for scheduling the received instruction.

A computer program product for instruction processing by a processor having multiple execution units, wherein the processor having multiple execution units comprises a dependency cache containing instructions associated with respective execution unit indicators, the computer program product comprising one or more tangible computer-readable storage devices and program instructions stored on at least one of the one or more tangible computer-readable storage devices, the program instructions comprising:

• program instructions to track dependent instructions currently assigned to each respective execution unit of the processor;
• in response to receiving an instruction of a dependency chain, program instructions to identify in the dependency cache the execution unit assigned to a previous instruction of the dependency chain on which the received instruction depends;
• and
• in response to more than a predefined maximum number of dependent instructions of the dependency chain are currently assigned to the identified execution unit, program instructions to select another execution unit of the processor having multiple execution units for scheduling the received instruction.