Paulo J. Matos wrote on 01/24/07 12:44:
check what kind of gimple code you get with -fdump-tree-gimple and -O0 and -O3 have different results,
-fdump-tree-gimple is the first dump *before* any optimizations occur. To see the effect of all the GIMPLE optimizations you should use -fdump-tree-optimized.
however, -O3 and -O9 have exactly the same output. Will -Ox for x > 3, generate the same gimple trees? (i.e., are done in backend of gcc?)
-On for n >= 3 is identical to -O3. This may change in the future.
