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OptSched

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Optimizing scheduler. Combinatorial instruction scheduling project.

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# OptSched - Optimizing Scheduler
Combinatorial instruction scheduling research project at CSU Sacramento.

This plugin for the [LLVM](https://llvm.org/) compiler is an optional machine scheduler. We implement a branch and bound instruction scheduling algorithm.

## Requirements

- Ubuntu 16.04 (recommended), or MacOS 10.14
- CMake 3.4.3 or later
- LLVM 6.0 or later

## Building

**See [BUILD.md](BUILD.md) for build instructions.**

The OptSched plugin can be found in “llvm/lib” after building.

## Configuration files

OptSched reads from configuration files at runtime to initialize the scheduler. There are templates in the [example](https://github.com/OptSched/OptSched/tree/master/example/optsched-cfg) directory. The default search location for these files is ```~/.optsched-cfg```. You can optionally specify the path to this directory or any of the configuration files individually with [command-line options](#Command-Line-Options).

## Usage Examples

`clang++ -O3 -fplugin=<path/to/OptSched.so> -mllvm -misched=optsched -mllvm -optsched-cfg=<path/to/optsched-cfg>  <example.cpp>`

`llc -load <path/to/OptSched.so> -misched=optsched -optsched-cfg=<path/to/optsched-cfg> <example.ll>`

## Command-Line Options

When using Clang, pass options to LLVM with `-mllvm`.

| CL Opt | Description |
| ------ | ----------- |
| -enable-misched | Enable the machine scheduling pass in LLVM (Targets can override this option). |
| -misched=optsched | Select the optimizing scheduler. |
| -debug-only=optsched | Print debug information from the scheduler. |
| -optsched-cfg=\<string\> | Path to the directory containing configuration files for opt-sched. |
| -optsched-cfg-hotfuncs=\<string\> | Path to the list of hot functions to schedule using opt-sched. |
| -optsched-cfg-machine-model=\<string\> | Path to the machine model specification file for opt-sched. |
| -optsched-cfg-sched=\<string\> | Path to the scheduler options configuration file for opt-sched. |

OptSched

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