PHiPAC Coding Guidelines

The following paragraphs exemplify PHiPAC C code generation guidelines. Programmers can use these coding guidelines directly to improve performance in critical routines while retaining portability, but this does come at the cost of less maintainable code. This problem is mitigated in the PHiPAC approach, however, by the use of parameterized code generators.

• Use local variables to explicitly remove false dependencies.
• Exploit multiple integer and floating point registers.
• Minimize pointer updates by striding with constant offsets.
• Hide multiple instruction FPU latency with independent operations.
• Balance the instruction mix.
• Increase locality to improve cache performance.
• Convert integer multiplies to adds.
• Minimize branches, avoid magnitude compares.
• Loop unroll explicitly to expose optimization opportunities.