kumon@xxxxxxxxxxxx writes: > When a C source program uses pointer auto increment operator within a > loop, sometimes ivopts replaces a pointer reference to an indexed memory access, > which causes poor performance in my case. The detail description > attached bellow. Does somebody give me a suggestion? The usual way to address this kind of thing is to adjust the TARGET_RTX_COSTS hook to return appropriate costs for pointer addressing vs. indexed memory addressing. If you compile with -fdump-tree-ivopts-details you will get a dump file which should give you some information about the costs that the ivopts pass is using. Ian
