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4.7.2 Optimization Utilities Reference

The following macros are meant to avoid certain optimizations the compiler might perform on your test code.

C Optimization Macro: MICRO_BENCHMARK_DO_NOT_OPTIMIZE (lvalue) ¶

Preconditions:

1. Function scope macro.

Effects:

1. Simulate read+write on lvalue.

Postconditions:

1. The compiler should not optimize lvalue away.

C Optimization Macro: MICRO_BENCHMARK_COMPILER_BARRIER () ¶

Preconditions:

1. Function scope macro.

Effects:

1. Memory fence.

Postconditions:

1. The compiler should treat all memory as clobbered.

C Utility Function: void micro_benchmark_do_not_optimize (const void *dummy) ¶

Preconditions:

1. None.

Effects:

1. “Compatibility” implementation of the previous macros.

Postconditions:

1. A wish of hope and not much more.