Qiang Huang wrote: > I used the command bellow: > > gcc -fdump-tree-ssa hello.c > > to dump the file in SSA form. However, I can't find the file in the > directory.It seems that the file wasn't dumped at all. You haven't asked gcc to do any optimization, so the tree-ssa passes never run and there's nothing to dump. You need to specify an optimization level higher than the default 0. Brian