Reducing Procedure Call Overhead: Optimizing Register Usage at Procedure Calls

This paper proposes a common global variable reassignment and an integrated approach which takes advantage of the complementary relationship of inlining and interprocedural register allocation to reduce the procedure call overhead without causing additional negative effect. Our approach is based on the observation of analyzed program characteristic t o identify the heavy called procedures regions and the register usage information t o optimize the placement of register save/restore code. This method also takes f i l l advantage of free-use registers at each procedure call site. The average performance improvement is 1.233 compared with the previous schemes that performed either of them independently.