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? Steve Ellcey sell...@cavium.com
