AMD 250 manual Additional Recommendations, 150

Software Optimization Guide for AMD64 Processors 25112 Rev. 3.06 September 2005

Additional Recommendations

In general, function inlining works best if the compiler utilizes feedback from a profiler to identify the function calls most frequently executed. If such data is not available, a reasonable approach is to concentrate on function calls inside loops. Do not consider as candidates for inlining any functions that are directly recursive. However, if they are end-recursive, the compiler should convert them to an iterative equivalent to avoid potential overflow of the processor’s return-prediction mechanism (return stack) during deep recursion. For best results, a compiler should support function inlining across multiple source files. In addition, a compiler should provide intrinsic functions for commonly used library routines, such as sin, strcmp, or memcpy.

150 Scheduling Optimizations Chapter 7