On Tue, May 2, 2017 at 11:40 PM, Steve Ellcey <sell...@cavium.com> wrote: > I have a question about -fopt-info. According to the GCC documentation at: > > https://gcc.gnu.org/onlinedocs/gccint/Dump-examples.html > > > | If options is omitted, it defaults to all-all, which means dump all > | available optimization info from all the passes. In the following example, > | all optimization info is output on to stderr. > | > | gcc -O3 -fopt-info > > But when I use the '-fopt-info' flag, I get less output about vectorization > than when I use '-fopt-info-all' or '-fopt-info-all-all'. > > For example if I compile: > > int foo(int *a, int *b, int *c, int n) { > int i; > for (i = 0; i < n; i++) > a[i] = b[i] + c[i]; > } > > with '-O3 -fopt-info' I get 6 lines of output. '-O3 -fopt-info-all' > or '-O3 -fopt-info-all-all' gives me 453 lines of output. > > Is the documentation wrong, the implementation wrong, or my understanding > of what the documentation is saying wrong?
I think this was discussed elsewhere and the documentation does not match the implementation. I think the behavior is to print optimized locations only but for all passes (which I believe is ok) Richard. > Steve Ellcey > sell...@cavium.com
